Neutron multiplication error in TRU waste measurements
Veilleux, John [Los Alamos National Laboratory; Stanfield, Sean B [CCP; Wachter, Joe [CCP; Ceo, Bob [CCP
2009-01-01T23:59:59.000Z
Total Measurement Uncertainty (TMU) in neutron assays of transuranic waste (TRU) are comprised of several components including counting statistics, matrix and source distribution, calibration inaccuracy, background effects, and neutron multiplication error. While a minor component for low plutonium masses, neutron multiplication error is often the major contributor to the TMU for items containing more than 140 g of weapons grade plutonium. Neutron multiplication arises when neutrons from spontaneous fission and other nuclear events induce fissions in other fissile isotopes in the waste, thereby multiplying the overall coincidence neutron response in passive neutron measurements. Since passive neutron counters cannot differentiate between spontaneous and induced fission neutrons, multiplication can lead to positive bias in the measurements. Although neutron multiplication can only result in a positive bias, it has, for the purpose of mathematical simplicity, generally been treated as an error that can lead to either a positive or negative result in the TMU. While the factors that contribute to neutron multiplication include the total mass of fissile nuclides, the presence of moderating material in the matrix, the concentration and geometry of the fissile sources, and other factors; measurement uncertainty is generally determined as a function of the fissile mass in most TMU software calculations because this is the only quantity determined by the passive neutron measurement. Neutron multiplication error has a particularly pernicious consequence for TRU waste analysis because the measured Fissile Gram Equivalent (FGE) plus twice the TMU error must be less than 200 for TRU waste packaged in 55-gal drums and less than 325 for boxed waste. For this reason, large errors due to neutron multiplication can lead to increased rejections of TRU waste containers. This report will attempt to better define the error term due to neutron multiplication and arrive at values that are more realistic and accurate. To do so, measurements of standards and waste drums were performed with High Efficiency Neutron Counters (HENC) located at Los Alamos National Laboratory (LANL). The data were analyzed for multiplication effects and new estimates of the multiplication error were computed. A concluding section will present alternatives for reducing the number of rejections of TRU waste containers due to neutron multiplication error.
Efficient Semiparametric Estimators for Biological, Genetic, and Measurement Error Applications
Garcia, Tanya
2012-10-19T23:59:59.000Z
to the models considered in Tsiatis and Ma (2004), our model is less stringent because it allows an unspecified model error distribution and unspecified covariate distribution, not just the latter. With an unspecified model error distribution, the RMM... with measurement error is a very different problem compared to the model considered in Tsiatis and Ma (2004), where the model error distribution has a known parametric form. Consequently, the semiparamet- ric treatment here is also drastically different. Our...
Slope Error Measurement Tool for Solar Parabolic Trough Collectors: Preprint
Stynes, J. K.; Ihas, B.
2012-04-01T23:59:59.000Z
The National Renewable Energy Laboratory (NREL) has developed an optical measurement tool for parabolic solar collectors that measures the combined errors due to absorber misalignment and reflector slope error. The combined absorber alignment and reflector slope errors are measured using a digital camera to photograph the reflected image of the absorber in the collector. Previous work using the image of the reflection of the absorber finds the reflector slope errors from the reflection of the absorber and an independent measurement of the absorber location. The accuracy of the reflector slope error measurement is thus dependent on the accuracy of the absorber location measurement. By measuring the combined reflector-absorber errors, the uncertainty in the absorber location measurement is eliminated. The related performance merit, the intercept factor, depends on the combined effects of the absorber alignment and reflector slope errors. Measuring the combined effect provides a simpler measurement and a more accurate input to the intercept factor estimate. The minimal equipment and setup required for this measurement technique make it ideal for field measurements.
MEASUREMENT AND CORRECTION OF ULTRASONIC ANEMOMETER ERRORS
Heinemann, Detlev
commonly show systematic errors depending on wind speed due to inaccurate ultrasonic transducer mounting three- dimensional wind speed time series. Results for the variance and power spectra are shown. 1 wind speeds with ultrasonic anemometers: The measu- red flow is distorted by the probe head
Ridge Regression Estimation Approach to Measurement Error Model
Shalabh
Ridge Regression Estimation Approach to Measurement Error Model A.K.Md. Ehsanes Saleh Carleton of the regression parameters is ill conditioned. We consider the Hoerl and Kennard type (1970) ridge regression (RR) modifications of the five quasi- empirical Bayes estimators of the regression parameters of a measurement error
Pressure Change Measurement Leak Testing Errors
Pryor, Jeff M [ORNL] [ORNL; Walker, William C [ORNL] [ORNL
2014-01-01T23:59:59.000Z
A pressure change test is a common leak testing method used in construction and Non-Destructive Examination (NDE). The test is known as being a fast, simple, and easy to apply evaluation method. While this method may be fairly quick to conduct and require simple instrumentation, the engineering behind this type of test is more complex than is apparent on the surface. This paper intends to discuss some of the more common errors made during the application of a pressure change test and give the test engineer insight into how to correctly compensate for these factors. The principals discussed here apply to ideal gases such as air or other monoatomic or diatomic gasses; however these same principals can be applied to polyatomic gasses or liquid flow rate with altered formula specific to those types of tests using the same methodology.
Robust mixtures in the presence of measurement errors
Jianyong Sun; Ata Kaban; Somak Raychaudhury
2007-09-06T23:59:59.000Z
We develop a mixture-based approach to robust density modeling and outlier detection for experimental multivariate data that includes measurement error information. Our model is designed to infer atypical measurements that are not due to errors, aiming to retrieve potentially interesting peculiar objects. Since exact inference is not possible in this model, we develop a tree-structured variational EM solution. This compares favorably against a fully factorial approximation scheme, approaching the accuracy of a Markov-Chain-EM, while maintaining computational simplicity. We demonstrate the benefits of including measurement errors in the model, in terms of improved outlier detection rates in varying measurement uncertainty conditions. We then use this approach in detecting peculiar quasars from an astrophysical survey, given photometric measurements with errors.
Universally Valid Error-Disturbance Relations in Continuous Measurements
Atsushi Nishizawa; Yanbei Chen
2015-05-31T23:59:59.000Z
In quantum physics, measurement error and disturbance were first naively thought to be simply constrained by the Heisenberg uncertainty relation. Later, more rigorous analysis showed that the error and disturbance satisfy more subtle inequalities. Several versions of universally valid error-disturbance relations (EDR) have already been obtained and experimentally verified in the regimes where naive applications of the Heisenberg uncertainty relation failed. However, these EDRs were formulated for discrete measurements. In this paper, we consider continuous measurement processes and obtain new EDR inequalities in the Fourier space: in terms of the power spectra of the system and probe variables. By applying our EDRs to a linear optomechanical system, we confirm that a tradeoff relation between error and disturbance leads to the existence of an optimal strength of the disturbance in a joint measurement. Interestingly, even with this optimal case, the inequality of the new EDR is not saturated because of doublely existing standard quantum limits in the inequality.
Measuring worst-case errors in a robot workcell
Simon, R.W.; Brost, R.C.; Kholwadwala, D.K. [Sandia National Labs., Albuquerque, NM (United States). Intelligent Systems and Robotics Center
1997-10-01T23:59:59.000Z
Errors in model parameters, sensing, and control are inevitably present in real robot systems. These errors must be considered in order to automatically plan robust solutions to many manipulation tasks. Lozano-Perez, Mason, and Taylor proposed a formal method for synthesizing robust actions in the presence of uncertainty; this method has been extended by several subsequent researchers. All of these results presume the existence of worst-case error bounds that describe the maximum possible deviation between the robot`s model of the world and reality. This paper examines the problem of measuring these error bounds for a real robot workcell. These measurements are difficult, because of the desire to completely contain all possible deviations while avoiding bounds that are overly conservative. The authors present a detailed description of a series of experiments that characterize and quantify the possible errors in visual sensing and motion control for a robot workcell equipped with standard industrial robot hardware. In addition to providing a means for measuring these specific errors, these experiments shed light on the general problem of measuring worst-case errors.
Optimal Estimation from Relative Measurements: Error Scaling (Extended Abstract)
Hespanha, João Pedro
"relative" measurement between xu and xv is available: uv = xu - xv + u,v Rk , (u, v) E V × V, (1) whereOptimal Estimation from Relative Measurements: Error Scaling (Extended Abstract) Prabir Barooah Jo~ao P. Hespanha I. ESTIMATION FROM RELATIVE MEASUREMENTS We consider the problem of estimating a number
Fast Error Estimates For Indirect Measurements: Applications To Pavement Engineering
Kreinovich, Vladik
Fast Error Estimates For Indirect Measurements: Applications To Pavement Engineering Carlos that is difficult to measure directly (e.g., lifetime of a pavement, efficiency of an engine, etc). To estimate y computation time. As an example of this methodology, we give pavement lifetime estimates. This work
Bayesian Semiparametric Density Deconvolution and Regression in the Presence of Measurement Errors
Sarkar, Abhra
2014-06-24T23:59:59.000Z
Although the literature on measurement error problems is quite extensive, solutions to even the most fundamental measurement error problems like density deconvolution and regression with errors-in-covariates are available ...
Exposure Measurement Error in Time-Series Studies of Air Pollution: Concepts and Consequences
Dominici, Francesca
1 Exposure Measurement Error in Time-Series Studies of Air Pollution: Concepts and Consequences S in time-series studies 1 11/11/99 Keywords: measurement error, air pollution, time series, exposure of air pollution and health. Because measurement error may have substantial implications for interpreting
A Memory Soft Error Measurement on Production Systems Xin Li Kai Shen Michael C. Huang
Shen, Kai
A Memory Soft Error Measurement on Production Systems Xin Li Kai Shen Michael C. Huang University and dealing with these soft (or transient) errors is impor- tant for system reliability. Several earlier for memory soft error measurement on production systems where performance impact on existing running ap
A Memory Soft Error Measurement on Production Systems # Xin Li Kai Shen Michael C. Huang
Shen, Kai
A Memory Soft Error Measurement on Production Systems # Xin Li Kai Shen Michael C. Huang University and dealing with these soft (or transient) errors is impor tant for system reliability. Several earlier for memory soft error measurement on production systems where performance impact on existing running ap
The Invariance of Score Tests to Measurement Error By CHI-LUN CHENG
Huang, Su-Yun
for a Box-Cox power transformation. Under speci c constraints, we show that the score tests for measurement these estab- lished results when the true model is subject to measurement errors. It is known that ignoring variable xi is the true value i plus some random measurement error i: xi = i + i (i = 1 n) (1
Adaptive Density Estimation in the Pile-up Model Involving Measurement Errors
Paris-Sud XI, Université de
Adaptive Density Estimation in the Pile-up Model Involving Measurement Errors Fabienne Comte, Tabea of nonparametric density estimation in the pile-up model. Adaptive nonparametric estimators are proposed for the pile-up model in its simple form as well as in the case of additional measurement errors. Furthermore
Correction of motion measurement errors beyond the range resolution of a synthetic aperture radar
Doerry, Armin W. (Albuquerque, NM); Heard, Freddie E. (Albuquerque, NM); Cordaro, J. Thomas (Albuquerque, NM)
2008-06-24T23:59:59.000Z
Motion measurement errors that extend beyond the range resolution of a synthetic aperture radar (SAR) can be corrected by effectively decreasing the range resolution of the SAR in order to permit measurement of the error. Range profiles can be compared across the slow-time dimension of the input data in order to estimate the error. Once the error has been determined, appropriate frequency and phase correction can be applied to the uncompressed input data, after which range and azimuth compression can be performed to produce a desired SAR image.
Mints, M.Ya.; Chinkov, V.N.
1995-09-01T23:59:59.000Z
Rational algorithms for measuring the harmonic coefficient in microprocessor instruments for measuring nonlinear distortions based on digital processing of the codes of the instantaneous values of the signal being investigated are described and the errors of such instruments are obtained.
Measurement and Analysis of the Error Characteristics of an In-Building Wireless Network
Steenkiste, Peter
on fiber or electrical connections have excellent error characteris- tics but that wireless networksMeasurement and Analysis of the Error Characteristics of an In-Building Wireless Network David fdavide,prsg@cs.cmu.edu Abstract There is general belief that networks based on wireless technolo- gies
Reducing the influence of microphone errors on in-situ ground impedance measurements
Vormann, Matthias
Reducing the influence of microphone errors on in- situ ground impedance measurements Roland Kruse. Keywords: Ground impedance; In-situ impedance measurement PACS 43.58.Bh #12;Introduction The acoustical. This problem is not specific to in-situ measurements but also applies to impedance tube measurements [9]. Two
THE EFFECT OF EXPERIMENTAL ERROR ON BAT PERFORMANCE MEASUREMENTS
Smith, Lloyd V.
of the ball. The coefficient of restitution (COR or e) is a measure of the dissipated energy from impact. Ball is found from the ratio of the rebound, vr, and inbound, vi, speeds as . (1) Balls are also regulated
Formalism for Simulation-based Optimization of Measurement Errors in High Energy Physics
Yuehong Xie
2009-04-29T23:59:59.000Z
Miminizing errors of the physical parameters of interest should be the ultimate goal of any event selection optimization in high energy physics data analysis involving parameter determination. Quick and reliable error estimation is a crucial ingredient for realizing this goal. In this paper we derive a formalism for direct evaluation of measurement errors using the signal probability density function and large fully simulated signal and background samples without need for data fitting and background modelling. We illustrate the elegance of the formalism in the case of event selection optimization for CP violation measurement in B decays. The implication of this formalism on choosing event variables for data analysis is discussed.
On the Importance of Considering Measurement Errors in a Fuzzy Logic System for Scientific Applications in Nuclear Fusion
Effect and minimization of errors in in-situ ground impedance measurements
Vormann, Matthias
Effect and minimization of errors in in-situ ground impedance measurements Roland Kruse, Volker method is a procedure to measure the surface impedance of grounds in-situ. In this article, the influence. #12;Keywords: Ground impedance; In-situ impedance measurement PACS 43.58.Bh Introduction The surface
Analysis of measurement errors for a superconducting phase qubit Qin Zhang,1 Abraham G. Kofman,1,
Martinis, John M.
Analysis of measurement errors for a superconducting phase qubit Qin Zhang,1 Abraham G. Kofman,1 of a superconducting flux- biased phase qubit. Insufficiently long measurement pulse may lead to nonadiabatic- veloping superconducting Josephson-junction circuits for quantum computation. A wide variety
Ultrasonic thickness measurements on corroded steel members: a statistical analysis of error
Konen, Keith Forman
1999-01-01T23:59:59.000Z
with measuring the wall thickness of a corroded tubular member and 2) determining how the strength calculations are affected by an error in a wall thickness measurement. This thesis is based on the first phase of a research project funded by Mineral Management...
SYSTEMATIC CONTINUUM ERRORS IN THE Ly{alpha} FOREST AND THE MEASURED TEMPERATURE-DENSITY RELATION
Lee, Khee-Gan, E-mail: lee@astro.princeton.edu [Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)
2012-07-10T23:59:59.000Z
Continuum fitting uncertainties are a major source of error in estimates of the temperature-density relation (usually parameterized as a power-law, T {proportional_to} {Delta}{sup {gamma}-1}) of the intergalactic medium through the flux probability distribution function (PDF) of the Ly{alpha} forest. Using a simple order-of-magnitude calculation, we show that few percent-level systematic errors in the placement of the quasar continuum due to, e.g., a uniform low-absorption Gunn-Peterson component could lead to errors in {gamma} of the order of unity. This is quantified further using a simple semi-analytic model of the Ly{alpha} forest flux PDF. We find that under(over)estimates in the continuum level can lead to a lower (higher) measured value of {gamma}. By fitting models to mock data realizations generated with current observational errors, we find that continuum errors can cause a systematic bias in the estimated temperature-density relation of ({delta}({gamma})) Almost-Equal-To -0.1, while the error is increased to {sigma}{sub {gamma}} Almost-Equal-To 0.2 compared to {sigma}{sub {gamma}} Almost-Equal-To 0.1 in the absence of continuum errors.
Detecting bit-flip errors in a logical qubit using stabilizer measurements
D. Ristè; S. Poletto; M. -Z. Huang; A. Bruno; V. Vesterinen; O. -P. Saira; L. DiCarlo
2014-11-20T23:59:59.000Z
Quantum data is susceptible to decoherence induced by the environment and to errors in the hardware processing it. A future fault-tolerant quantum computer will use quantum error correction (QEC) to actively protect against both. In the smallest QEC codes, the information in one logical qubit is encoded in a two-dimensional subspace of a larger Hilbert space of multiple physical qubits. For each code, a set of non-demolition multi-qubit measurements, termed stabilizers, can discretize and signal physical qubit errors without collapsing the encoded information. Experimental demonstrations of QEC to date, using nuclear magnetic resonance, trapped ions, photons, superconducting qubits, and NV centers in diamond, have circumvented stabilizers at the cost of decoding at the end of a QEC cycle. This decoding leaves the quantum information vulnerable to physical qubit errors until re-encoding, violating a basic requirement for fault tolerance. Using a five-qubit superconducting processor, we realize the two parity measurements comprising the stabilizers of the three-qubit repetition code protecting one logical qubit from physical bit-flip errors. We construct these stabilizers as parallelized indirect measurements using ancillary qubits, and evidence their non-demolition character by generating three-qubit entanglement from superposition states. We demonstrate stabilizer-based quantum error detection (QED) by subjecting a logical qubit to coherent and incoherent bit-flip errors on its constituent physical qubits. While increased physical qubit coherence times and shorter QED blocks are required to actively safeguard quantum information, this demonstration is a critical step toward larger codes based on multiple parity measurements.
Lobach, Iryna
2009-05-15T23:59:59.000Z
) are binary and probability of disease is known. Environmental variable is measured with error with misclassi cation probabilities pr(W = 0jX = 1) = 0:20 and pr(W = 1jX = 0) = 0:10. The results are based on a simulation study with 500 replications for 1000... variant (G), and environmental covariate (X) are binary and probability of disease is unknown. Environmen- tal variable is measured with error with misclassi cation probabilities pr(W = 0jX = 1) = 0:20 and pr(W = 1jX = 0) = 0:10. The results are based on a...
Tullos, Desiree
DOWNSTREAM CHANNEL CHANGES AFTER A SMALL DAM REMOVAL: USING AERIAL PHOTOS AND MEASUREMENT ERROR and Ecological Engineering, Oregon State University, Corvallis, OR, USA ABSTRACT Dam removal is often implemented to assess downstream channel changes associated with a small dam removal. The Brownsville Dam, a 2.1 m tall
Schierup, Mikkel Heide
Correction for measurement error from genotyping-by-sequencing in genomic variance and genomic for Quantitative Genetics and Genomics, Department of Molecular Biology and Genetics, Aarhus University Denmark DLF-Trfolium, Store Heddinge, Denmark CENTER FOR QUANTITATIVE GENETICS AND GENOMICS F2 F2 Simulate sequencing Genotype
JPEG Quality Transcoding using Neural Networks Trained with a Perceptual Error Measure
Lazzaro, John
JPEG Quality Transcoding using Neural Networks Trained with a Perceptual Error Measure John Lazzaro@cs.berkeley.edu Abstract A JPEG Quality Transcoder (JQT) converts a JPEG image file that was encoded with low image quality users direct control over the compression process, supporting trade- offs between image quality
A multi-site analysis of random error2 in tower-based measurements of carbon and energy fluxes3
1 A multi-site analysis of random error2 in tower-based measurements of carbon and energy fluxes3 4 Forest Service, 271 Mast Road, Durham, NH 03824 USA.25 #12;RANDOM ERRORS IN ENERGY AND CO2 FLUX MEASUREMENTS Richardson et al. 1 January 13, 2006 Abstract1 Measured surface-atmosphere fluxes of energy
Effects of Spectral Error in Efficiency Measurements of GaInAs-Based Concentrator Solar Cells
Osterwald, C. R.; Wanlass, M. W.; Moriarty, T.; Steiner, M. A.; Emery, K. A.
2014-03-01T23:59:59.000Z
This technical report documents a particular error in efficiency measurements of triple-absorber concentrator solar cells caused by incorrect spectral irradiance -- specifically, one that occurs when the irradiance from unfiltered, pulsed xenon solar simulators into the GaInAs bottom subcell is too high. For cells designed so that the light-generated photocurrents in the three subcells are nearly equal, this condition can cause a large increase in the measured fill factor, which, in turn, causes a significant artificial increase in the efficiency. The error is readily apparent when the data under concentration are compared to measurements with correctly balanced photocurrents, and manifests itself as discontinuities in plots of fill factor and efficiency versus concentration ratio. In this work, we simulate the magnitudes and effects of this error with a device-level model of two concentrator cell designs, and demonstrate how a new Spectrolab, Inc., Model 460 Tunable-High Intensity Pulsed Solar Simulator (T-HIPSS) can mitigate the error.
Detecting arbitrary quantum errors via stabilizer measurements on a sublattice of the surface code
A. D. Córcoles; Easwar Magesan; Srikanth J. Srinivasan; Andrew W. Cross; M. Steffen; Jay M. Gambetta; Jerry M. Chow
2014-10-23T23:59:59.000Z
To build a fault-tolerant quantum computer, it is necessary to implement a quantum error correcting code. Such codes rely on the ability to extract information about the quantum error syndrome while not destroying the quantum information encoded in the system. Stabilizer codes are attractive solutions to this problem, as they are analogous to classical linear codes, have simple and easily computed encoding networks, and allow efficient syndrome extraction. In these codes, syndrome extraction is performed via multi-qubit stabilizer measurements, which are bit and phase parity checks up to local operations. Previously, stabilizer codes have been realized in nuclei, trapped-ions, and superconducting qubits. However these implementations lack the ability to perform fault-tolerant syndrome extraction which continues to be a challenge for all physical quantum computing systems. Here we experimentally demonstrate a key step towards this problem by using a two-by-two lattice of superconducting qubits to perform syndrome extraction and arbitrary error detection via simultaneous quantum non-demolition stabilizer measurements. This lattice represents a primitive tile for the surface code, which is a promising stabilizer code for scalable quantum computing. Furthermore, we successfully show the preservation of an entangled state in the presence of an arbitrary applied error through high-fidelity syndrome measurement. Our results bolster the promise of employing lattices of superconducting qubits for larger-scale fault-tolerant quantum computing.
Doerry, Armin W. (Albuquerque, NM); Heard, Freddie E. (Albuquerque, NM); Cordaro, J. Thomas (Albuquerque, NM)
2010-07-20T23:59:59.000Z
Motion measurement errors that extend beyond the range resolution of a synthetic aperture radar (SAR) can be corrected by effectively decreasing the range resolution of the SAR in order to permit measurement of the error. Range profiles can be compared across the slow-time dimension of the input data in order to estimate the error. Once the error has been determined, appropriate frequency and phase correction can be applied to the uncompressed input data, after which range and azimuth compression can be performed to produce a desired SAR image.
Ali, Zulfiqar
2013-01-01T23:59:59.000Z
synchrotron facilities, such as the Nanometer Optical Component Measuring Machines (NOM) at Helmholtz Zentrum Berlin (HZB)/BESSY-
Lobach, Iryna
2009-05-15T23:59:59.000Z
environmental variables we used additive model of the form W = X + U, where U is generated from the Normal distribution with zero mean and variance = 0:25. Given the following haplotype frequencies (h1;h2;h3;h4;h5;h6) = (0:25;0:15;0:25;0:1;0:1;0:15) we... . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Gene-Environment Interactions . . . . . . . . . . . . . . . . . 1 1.3 Prospective Analysis of Case-Control Studies . . . . . . . . . . 2 1.4 Measurement Error in Epidemiologic Studies . . . . . . . . . . 3 1.5 Haplotype-Based studies...
A multi-site analysis of random error in tower-based measurements of carbon and energy fluxes
A multi-site analysis of random error in tower-based measurements of carbon and energy fluxes 2006 Abstract Measured surface-atmosphere fluxes of energy (sensible heat, H, and latent heat, LE of which include ``tall tower'' instrumentation), one grassland site, and one agricultural site, to conduct
Davidson, R. L.; Earle, G. D.; Heelis, R. A. [William B. Hanson Center for Space Sciences, University of Texas at Dallas, 800 W. Campbell Road, WT15, Richardson, Texas 75080 (United States); Klenzing, J. H. [Space Weather Laboratory/Code 674, Goddard Space Flight Center, Greenbelt, Maryland 20771 (United States)
2010-08-15T23:59:59.000Z
Planar retarding potential analyzers (RPAs) have been utilized numerous times on high profile missions such as the Communications/Navigation Outage Forecast System and the Defense Meteorological Satellite Program to measure plasma composition, temperature, density, and the velocity component perpendicular to the plane of the instrument aperture. These instruments use biased grids to approximate ideal biased planes. These grids introduce perturbations in the electric potential distribution inside the instrument and when unaccounted for cause errors in the measured plasma parameters. Traditionally, the grids utilized in RPAs have been made of fine wires woven into a mesh. Previous studies on the errors caused by grids in RPAs have approximated woven grids with a truly flat grid. Using a commercial ion optics software package, errors in inferred parameters caused by both woven and flat grids are examined. A flat grid geometry shows the smallest temperature and density errors, while the double thick flat grid displays minimal errors for velocities over the temperature and velocity range used. Wire thickness along the dominant flow direction is found to be a critical design parameter in regard to errors in all three inferred plasma parameters. The results shown for each case provide valuable design guidelines for future RPA development.
Impact of instrumental systematic errors on fine-structure constant measurements with quasar spectra
J. B. Whitmore; M. T. Murphy
2014-11-18T23:59:59.000Z
We present a new `supercalibration' technique for measuring systematic distortions in the wavelength scales of high resolution spectrographs. By comparing spectra of `solar twin' stars or asteroids with a reference laboratory solar spectrum, distortions in the standard thorium--argon calibration can be tracked with $\\sim$10 m s$^{-1}$ precision over the entire optical wavelength range on scales of both echelle orders ($\\sim$50--100 \\AA) and entire spectrographs arms ($\\sim$1000--3000 \\AA). Using archival spectra from the past 20 years we have probed the supercalibration history of the VLT--UVES and Keck--HIRES spectrographs. We find that systematic errors in their wavelength scales are ubiquitous and substantial, with long-range distortions varying between typically $\\pm$200 m s$^{-1}$ per 1000 \\AA. We apply a simple model of these distortions to simulated spectra that characterize the large UVES and HIRES quasar samples which previously indicated possible evidence for cosmological variations in the fine-structure constant, $\\alpha$. The spurious deviations in $\\alpha$ produced by the model closely match important aspects of the VLT--UVES quasar results at all redshifts and partially explain the HIRES results, though not self-consistently at all redshifts. That is, the apparent ubiquity, size and general characteristics of the distortions are capable of significantly weakening the evidence for variations in $\\alpha$ from quasar absorption lines.
Norton, David Jerry
1963-01-01T23:59:59.000Z
SOME CHARACTERISTICS OF DYNAMIC PRESSURE MEASUREMENTS IN AN INTERNAL COMBUSTION ENGINE, AND A METHOD OF COMPENSATION FOR THE ERRORS IN THE MEASURING SYSTEM. A Thesis By David J. Norton Submitted to the Graduate School of the Agricultural... and Mechanical College of Texas in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE August 1963 Major Subject; Mechanical Engineering SOME CHARACTERISTICS OF DYNAMIC PRESSURE MEASUREMENTS IN AN INTERNAL COMBUSTION ENGINE, AND A...
ERROR MODELS FOR LIGHT SENSORS BY STATISTICAL ANALYSIS OF RAW SENSOR MEASUREMENTS
Potkonjak, Miodrag
silicon solar cell that converts light impulses directly into electrical charges that can easily-based systems including calibration, sensor fusion and power management. We developed a system of statistical the standard procedure is to use error models to enable calibration, in a variant of our approach, we use
Doerry, Armin W. (Albuquerque, NM); Heard, Freddie E. (Albuquerque, NM); Cordaro, J. Thomas (Albuquerque, NM)
2010-08-17T23:59:59.000Z
Motion measurement errors that extend beyond the range resolution of a synthetic aperture radar (SAR) can be corrected by effectively decreasing the range resolution of the SAR in order to permit measurement of the error. Range profiles can be compared across the slow-time dimension of the input data in order to estimate the error. Once the error has been determined, appropriate frequency and phase correction can be applied to the uncompressed input data, after which range and azimuth compression can be performed to produce a desired SAR image.
Tyler, John E
1967-01-01T23:59:59.000Z
metric measurement for correlation with primary productivityMEASUREMENT OF RADIANT ENERGY FOR CORRELATION WITH PRIMARY PRODUCTIVITYMEASUREMENT OF RADIANT ENERGY FOR CORRELATION WITH PRIMARY PRODUCTIVITY.
Automated suppression of errors in LTP-II slope measurements with x-ray optics
Ali, Zulfiqar
2012-01-01T23:59:59.000Z
synchrotron facilities, such as the Nanometer Optical Component Measuring Machines (NOM) at Helmholtz Zentrum Berlin (HZB)/BESSY-
Automated suppression of errors in LTP-II slope measurements with x-ray optics
Ali, Zulfiqar
2011-01-01T23:59:59.000Z
slope measurements with x-ray optics Zulfiqar Ali, Curtis L.with state-of-the-art x-ray optics. Significant suppressionscanning, metrology of x-ray optics, deflectometry Abstract
Long, David G.
of ocean wind speed and direction. Scatterometers must be calibrated before their measurements are scienti in the long-term, thus propelling them out of the crowded valley of the common and up the inclines
Aravind Natarajan; Andrew R. Zentner; Nicholas Battaglia; Hy Trac
2014-09-04T23:59:59.000Z
We examine the importance of baryonic feedback effects on the matter power spectrum on small scales, and the implications for the precise measurement of neutrino masses through gravitational weak lensing. Planned large galaxy surveys such as the Large Synoptic Sky Telescope (LSST) and Euclid are expected to measure the sum of neutrino masses to extremely high precision, sufficient to detect non-zero neutrino masses even in the minimal mass normal hierarchy. We show that weak lensing of galaxies while being a very good probe of neutrino masses, is extremely sensitive to baryonic feedback processes. We use publicly available results from the Overwhelmingly Large Simulations (OWLS) project to investigate the effects of active galactic nuclei feedback, the nature of the stellar initial mass function, and gas cooling rates, on the measured weak lensing shear power spectrum. Using the Fisher matrix formalism and priors from CMB+BAO data, we show that when one does not account for feedback, the measured neutrino mass may be substantially larger or smaller than the true mass, depending on the dominant feedback mechanism, with the mass error |\\Delta m_nu| often exceeding the mass m_nu itself. We also consider gravitational lensing of the cosmic microwave background (CMB) and show that it is not sensitive to baryonic feedback on scales l < 2000, although CMB experiments that aim for sensitivities sigma(m_nu) < 0.02 eV will need to include baryonic effects in modeling the CMB lensing potential. A combination of CMB lensing and galaxy lensing can help break the degeneracy between neutrino masses and baryonic feedback processes. We conclude that future large galaxy lensing surveys such as LSST and Euclid can only measure neutrino masses accurately if the matter power spectrum can be measured to similar accuracy.
Elliott, C.J.; McVey, B. (Los Alamos National Lab., NM (USA)); Quimby, D.C. (Spectra Technology, Inc., Bellevue, WA (USA))
1990-01-01T23:59:59.000Z
The level of field errors in an FEL is an important determinant of its performance. We have computed 3D performance of a large laser subsystem subjected to field errors of various types. These calculations have been guided by simple models such as SWOOP. The technique of choice is utilization of the FELEX free electron laser code that now possesses extensive engineering capabilities. Modeling includes the ability to establish tolerances of various types: fast and slow scale field bowing, field error level, beam position monitor error level, gap errors, defocusing errors, energy slew, displacement and pointing errors. Many effects of these errors on relative gain and relative power extraction are displayed and are the essential elements of determining an error budget. The random errors also depend on the particular random number seed used in the calculation. The simultaneous display of the performance versus error level of cases with multiple seeds illustrates the variations attributable to stochasticity of this model. All these errors are evaluated numerically for comprehensive engineering of the system. In particular, gap errors are found to place requirements beyond mechanical tolerances of {plus minus}25{mu}m, and amelioration of these may occur by a procedure utilizing direct measurement of the magnetic fields at assembly time. 4 refs., 12 figs.
Petriu, Emil M.
. This is a very limited application that only considers a docking station. A helicopter fuzzy controller developed by Cavalcante in Florianopolis, Brazil [4], decomposes the movements of a helicopter into four separate blocks inputs represent errors and error deviations. The fuzzy output represents corrections to the helicopter
Reversible (unitary) Ancillary qbits Controlled gates (cX, cZ) #12;Measurement Deterministic Duplication;Decoding use ancillary bits to determine what error occurred #12;Decoding use ancillary bits to determine what error occurred set to 0 if first two bits equal, set to 1 if not #12;Decoding use ancillary bits
Uncertainty quantification and error analysis
Higdon, Dave M [Los Alamos National Laboratory; Anderson, Mark C [Los Alamos National Laboratory; Habib, Salman [Los Alamos National Laboratory; Klein, Richard [Los Alamos National Laboratory; Berliner, Mark [OHIO STATE UNIV.; Covey, Curt [LLNL; Ghattas, Omar [UNIV OF TEXAS; Graziani, Carlo [UNIV OF CHICAGO; Seager, Mark [LLNL; Sefcik, Joseph [LLNL; Stark, Philip [UC/BERKELEY; Stewart, James [SNL
2010-01-01T23:59:59.000Z
UQ studies all sources of error and uncertainty, including: systematic and stochastic measurement error; ignorance; limitations of theoretical models; limitations of numerical representations of those models; limitations on the accuracy and reliability of computations, approximations, and algorithms; and human error. A more precise definition for UQ is suggested below.
Yan, M.; Lovelock, D.; Hunt, M.; Mechalakos, J.; Hu, Y.; Pham, H.; Jackson, A., E-mail: jacksona@mskcc.org [Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, New York 10065 (United States)
2013-12-15T23:59:59.000Z
Purpose: To use Cone Beam CT scans obtained just prior to treatments of head and neck cancer patients to measure the setup error and cumulative dose uncertainty of the cochlea. Methods: Data from 10 head and neck patients with 10 planning CTs and 52 Cone Beam CTs taken at time of treatment were used in this study. Patients were treated with conventional fractionation using an IMRT dose painting technique, most with 33 fractions. Weekly radiographic imaging was used to correct the patient setup. The authors used rigid registration of the planning CT and Cone Beam CT scans to find the translational and rotational setup errors, and the spatial setup errors of the cochlea. The planning CT was rotated and translated such that the cochlea positions match those seen in the cone beam scans, cochlea doses were recalculated and fractional doses accumulated. Uncertainties in the positions and cumulative doses of the cochlea were calculated with and without setup adjustments from radiographic imaging. Results: The mean setup error of the cochlea was 0.04 ± 0.33 or 0.06 ± 0.43 cm for RL, 0.09 ± 0.27 or 0.07 ± 0.48 cm for AP, and 0.00 ± 0.21 or ?0.24 ± 0.45 cm for SI with and without radiographic imaging, respectively. Setup with radiographic imaging reduced the standard deviation of the setup error by roughly 1–2 mm. The uncertainty of the cochlea dose depends on the treatment plan and the relative positions of the cochlea and target volumes. Combining results for the left and right cochlea, the authors found the accumulated uncertainty of the cochlea dose per fraction was 4.82 (0.39–16.8) cGy, or 10.1 (0.8–32.4) cGy, with and without radiographic imaging, respectively; the percentage uncertainties relative to the planned doses were 4.32% (0.28%–9.06%) and 10.2% (0.7%–63.6%), respectively. Conclusions: Patient setup error introduces uncertainty in the position of the cochlea during radiation treatment. With the assistance of radiographic imaging during setup, the standard deviation of setup error reduced by 31%, 42%, and 54% in RL, AP, and SI direction, respectively, and consequently, the uncertainty of the mean dose to cochlea reduced more than 50%. The authors estimate that the effects of these uncertainties on the probability of hearing loss for an individual patient could be as large as 10%.
Ewers, Brent E.
- tively. Sap flux measured in stems did not lag JS measured in branches, and time and frequency domain. Introduction Stomata respond to environmental variation, regulate water loss and carbon dioxide gain, and thus biosphereatmosphere exchange of mass and energy. From porometry measure- ments, leaf conductance (gS) can
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Beddo, M.E.; Spinka, H.; Underwood, D.G.
1992-08-14T23:59:59.000Z
Studies of inclusive direct-{gamma} production by pp interactions at RHIC energies were performed. Rates and the associated uncertainties on spin-spin observables for this process were computed for the planned PHENIX and STAR detectors at energies between {radical}s = 50 and 500 GeV. Also, rates were computed for direct-{gamma} + jet production for the STAR detector. The goal was to study the gluon spin distribution functions with such measurements. Recommendations concerning the electromagnetic calorimeter design and the need for an endcap calorimeter for STAR are made.
Remarks on statistical errors in equivalent widths
Klaus Vollmann; Thomas Eversberg
2006-07-03T23:59:59.000Z
Equivalent width measurements for rapid line variability in atomic spectral lines are degraded by increasing error bars with shorter exposure times. We derive an expression for the error of the line equivalent width $\\sigma(W_\\lambda)$ with respect to pure photon noise statistics and provide a correction value for previous calculations.
Estimating IMU heading error from SAR images.
Doerry, Armin Walter
2009-03-01T23:59:59.000Z
Angular orientation errors of the real antenna for Synthetic Aperture Radar (SAR) will manifest as undesired illumination gradients in SAR images. These gradients can be measured, and the pointing error can be calculated. This can be done for single images, but done more robustly using multi-image methods. Several methods are provided in this report. The pointing error can then be fed back to the navigation Kalman filter to correct for problematic heading (yaw) error drift. This can mitigate the need for uncomfortable and undesired IMU alignment maneuvers such as S-turns.
Error handling strategies in multiphase inverse modeling
Finsterle, S.; Zhang, Y.
2010-12-01T23:59:59.000Z
Parameter estimation by inverse modeling involves the repeated evaluation of a function of residuals. These residuals represent both errors in the model and errors in the data. In practical applications of inverse modeling of multiphase flow and transport, the error structure of the final residuals often significantly deviates from the statistical assumptions that underlie standard maximum likelihood estimation using the least-squares method. Large random or systematic errors are likely to lead to convergence problems, biased parameter estimates, misleading uncertainty measures, or poor predictive capabilities of the calibrated model. The multiphase inverse modeling code iTOUGH2 supports strategies that identify and mitigate the impact of systematic or non-normal error structures. We discuss these approaches and provide an overview of the error handling features implemented in iTOUGH2.
Monte Carlo errors with less errors
Ulli Wolff
2006-11-29T23:59:59.000Z
We explain in detail how to estimate mean values and assess statistical errors for arbitrary functions of elementary observables in Monte Carlo simulations. The method is to estimate and sum the relevant autocorrelation functions, which is argued to produce more certain error estimates than binning techniques and hence to help toward a better exploitation of expensive simulations. An effective integrated autocorrelation time is computed which is suitable to benchmark efficiencies of simulation algorithms with regard to specific observables of interest. A Matlab code is offered for download that implements the method. It can also combine independent runs (replica) allowing to judge their consistency.
Olson, Eric J.
2013-06-11T23:59:59.000Z
An apparatus, program product, and method that run an algorithm on a hardware based processor, generate a hardware error as a result of running the algorithm, generate an algorithm output for the algorithm, compare the algorithm output to another output for the algorithm, and detect the hardware error from the comparison. The algorithm is designed to cause the hardware based processor to heat to a degree that increases the likelihood of hardware errors to manifest, and the hardware error is observable in the algorithm output. As such, electronic components may be sufficiently heated and/or sufficiently stressed to create better conditions for generating hardware errors, and the output of the algorithm may be compared at the end of the run to detect a hardware error that occurred anywhere during the run that may otherwise not be detected by traditional methodologies (e.g., due to cooling, insufficient heat and/or stress, etc.).
Agility metric sensitivity using linear error theory
Smith, David Matthew
2000-01-01T23:59:59.000Z
Aircraft agility metrics have been proposed for use to measure the performance and capability of aircraft onboard while in-flight. The sensitivity of these metrics to various types of errors and uncertainties is not ...
Zhang, Yunpeng; Li, En, E-mail: lien@uestc.edu.cn; Guo, Gaofeng; Xu, Jiadi; Wang, Chao [School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 611731 (China)
2014-09-15T23:59:59.000Z
A pair of spot-focusing horn lens antenna is the key component in a free-space measurement system. The electromagnetic constitutive parameters of a planar sample are determined using transmitted and reflected electromagnetic beams. These parameters are obtained from the measured scattering parameters by the microwave network analyzer, thickness of the sample, and wavelength of a focused beam on the sample. Free-space techniques introduced by most papers consider the focused wavelength as the free-space wavelength. But in fact, the incident wave projected by a lens into the sample approximates a Gaussian beam, thus, there has an elongation of the wavelength in the focused beam and this elongation should be taken into consideration in dielectric and magnetic measurement. In this paper, elongation of the wavelength has been analyzed and measured. Measurement results show that the focused wavelength in the vicinity of the focus has an elongation of 1%–5% relative to the free-space wavelength. Elongation's influence on the measurement result of the permittivity and permeability has been investigated. Numerical analyses show that the elongation of the focused wavelength can cause the increase of the measured value of the permeability relative to traditionally measured value, but for the permittivity, it is affected by several parameters and may increase or decrease relative to traditionally measured value.
Ali, Zulfiqar
2013-01-01T23:59:59.000Z
measurements with x-ray optics. Part 1: Review of LTP errorsprecise reflective X-ray optics,” Nucl. Inst. and Meth. Ameasurements of x-ray optics. Part 2: Specification for
Abdelhamid Awad Aly Ahmed, Sala
2008-10-10T23:59:59.000Z
QUANTUM ERROR CONTROL CODES A Dissertation by SALAH ABDELHAMID AWAD ALY AHMED Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY May 2008 Major... Subject: Computer Science QUANTUM ERROR CONTROL CODES A Dissertation by SALAH ABDELHAMID AWAD ALY AHMED Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY...
Thermodynamics of error correction
Pablo Sartori; Simone Pigolotti
2015-04-24T23:59:59.000Z
Information processing at the molecular scale is limited by thermal fluctuations. This can cause undesired consequences in copying information since thermal noise can lead to errors that can compromise the functionality of the copy. For example, a high error rate during DNA duplication can lead to cell death. Given the importance of accurate copying at the molecular scale, it is fundamental to understand its thermodynamic features. In this paper, we derive a universal expression for the copy error as a function of entropy production and dissipated work of the process. Its derivation is based on the second law of thermodynamics, hence its validity is independent of the details of the molecular machinery, be it any polymerase or artificial copying device. Using this expression, we find that information can be copied in three different regimes. In two of them, work is dissipated to either increase or decrease the error. In the third regime, the protocol extracts work while correcting errors, reminiscent of a Maxwell demon. As a case study, we apply our framework to study a copy protocol assisted by kinetic proofreading, and show that it can operate in any of these three regimes. We finally show that, for any effective proofreading scheme, error reduction is limited by the chemical driving of the proofreading reaction.
Quantum Error Correction Workshop on
Grassl, Markus
Error Correction Avoiding Errors: Mathematical Model decomposition of the interaction algebra;Quantum Error Correction Designed Hamiltonians Main idea: "perturb the system to make it more stable" · fast (local) control operations = average Hamiltonian with more symmetry (cf. techniques from NMR
Beddo, M.E.; Spinka, H.; Underwood, D.G.
1992-08-14T23:59:59.000Z
Studies of inclusive direct-{gamma} production by pp interactions at RHIC energies were performed. Rates and the associated uncertainties on spin-spin observables for this process were computed for the planned PHENIX and STAR detectors at energies between {radical}s = 50 and 500 GeV. Also, rates were computed for direct-{gamma} + jet production for the STAR detector. The goal was to study the gluon spin distribution functions with such measurements. Recommendations concerning the electromagnetic calorimeter design and the need for an endcap calorimeter for STAR are made.
STATISTICAL MODEL OF SYSTEMATIC ERRORS: LINEAR ERROR MODEL
Rudnyi, Evgenii B.
to apply. The algorithm to maximize a likelihood function in the case of a non-linear physico - the same variances of errors 3.1. One-way classification 3.2. Linear regression 4. Real case (vaporizationSTATISTICAL MODEL OF SYSTEMATIC ERRORS: LINEAR ERROR MODEL E.B. Rudnyi Department of Chemistry
Soft Error Modeling and Protection for Sequential Elements Hossein Asadi and Mehdi B. Tahoori
on system-level soft error rate. The number of clock cycles required for an error in a bistable to be propagated to system outputs is used to measure the vulnerability of bistables to soft errors. 1 Introduction, soft errors become the main reliability concern during lifetime operation of digital systems. Soft
Annual Energy Outlook 2013 [U.S. Energy Information Administration (EIA)]
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Annual Energy Outlook 2013 [U.S. Energy Information Administration (EIA)]
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Register file soft error recovery
Fleischer, Bruce M.; Fox, Thomas W.; Wait, Charles D.; Muff, Adam J.; Watson, III, Alfred T.
2013-10-15T23:59:59.000Z
Register file soft error recovery including a system that includes a first register file and a second register file that mirrors the first register file. The system also includes an arithmetic pipeline for receiving data read from the first register file, and error detection circuitry to detect whether the data read from the first register file includes corrupted data. The system further includes error recovery circuitry to insert an error recovery instruction into the arithmetic pipeline in response to detecting the corrupted data. The inserted error recovery instruction replaces the corrupted data in the first register file with a copy of the data from the second register file.
Identification of toroidal field errors in a modified betatron accelerator
Loschialpo, P. (Beam Physics Branch, Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375 (United States)); Marsh, S.J. (SFA Inc., Landover, Maryland 20785 (United States)); Len, L.K.; Smith, T. (FM Technologies Inc., 10529-B Braddock Road, Fairfax, Virginia 22032 (United States)); Kapetanakos, C.A. (Beam Physics Branch, Plasma Physics Division, Naval Research Laboratory, Washington, DC 20375 (United States))
1993-06-01T23:59:59.000Z
A newly developed probe, having a 0.05% resolution, has been used to detect errors in the toroidal magnetic field of the NRL modified betatron accelerator. Measurements indicate that the radial field components (errors) are 0.1%--1% of the applied toroidal field. Such errors, in the typically 5 kG toroidal field, can excite resonances which drive the beam to the wall. Two sources of detected field errors are discussed. The first is due to the discrete nature of the 12 single turn coils which generate the toroidal field. Both measurements and computer calculations indicate that its amplitude varies from 0% to 0.2% as a function of radius. Displacement of the outer leg of one of the toroidal field coils by a few millimeters has a significant effect on the amplitude of this field error. Because of uniform toroidal periodicity of these coils this error is a good suspect for causing the excitation of the damaging [ital l]=12 resonance seen in our experiments. The other source of field error is due to the current feed gaps in the vertical magnetic field coils. A magnetic field is induced inside the vertical field coils' conductor in the opposite direction of the applied toroidal field. Fringe fields at the gaps lead to additional field errors which have been measured as large as 1.0%. This source of field error, which exists at five toroidal locations around the modified betatron, can excite several integer resonances, including the [ital l]=12 mode.
Error models in quantum computation: an application of model selection
Lucia Schwarz; Steven van Enk
2013-09-04T23:59:59.000Z
Threshold theorems for fault-tolerant quantum computing assume that errors are of certain types. But how would one detect whether errors of the "wrong" type occur in one's experiment, especially if one does not even know what type of error to look for? The problem is that for many qubits a full state description is impossible to analyze, and a full process description is even more impossible to analyze. As a result, one simply cannot detect all types of errors. Here we show through a quantum state estimation example (on up to 25 qubits) how to attack this problem using model selection. We use, in particular, the Akaike Information Criterion. The example indicates that the number of measurements that one has to perform before noticing errors of the wrong type scales polynomially both with the number of qubits and with the error size.
A two reservoir model of quantum error correction
James P. Clemens; Julio Gea-Banacloche
2005-08-22T23:59:59.000Z
We consider a two reservoir model of quantum error correction with a hot bath causing errors in the qubits and a cold bath cooling the ancilla qubits to a fiducial state. We consider error correction protocols both with and without measurement of the ancilla state. The error correction acts as a kind of refrigeration process to maintain the data qubits in a low entropy state by periodically moving the entropy to the ancilla qubits and then to the cold reservoir. We quantify the performance of the error correction as a function of the reservoir temperatures and cooling rate by means of the fidelity and the residual entropy of the data qubits. We also make a comparison with the continuous quantum error correction model of Sarovar and Milburn [Phys. Rev. A 72 012306].
Sensitivity of OFDM Systems to Synchronization Errors and Spatial Diversity
Zhou, Yi
2012-02-14T23:59:59.000Z
jitter cause inter-carrier interference. The overall system performance in terms of symbol error rate is limited by the inter-carrier interference. For a reliable information reception, compensatory measures must be taken. The second part...
Diagnosing multiplicative error by lensing magnification of type Ia supernovae
Zhang, Pengjie
2015-01-01T23:59:59.000Z
Weak lensing causes spatially coherent fluctuations in flux of type Ia supernovae (SNe Ia). This lensing magnification allows for weak lensing measurement independent of cosmic shear. It is free of shape measurement errors associated with cosmic shear and can therefore be used to diagnose and calibrate multiplicative error. Although this lensing magnification is difficult to measure accurately in auto correlation, its cross correlation with cosmic shear and galaxy distribution in overlapping area can be measured to significantly higher accuracy. Therefore these cross correlations can put useful constraint on multiplicative error, and the obtained constraint is free of cosmic variance in weak lensing field. We present two methods implementing this idea and estimate their performances. We find that, with $\\sim 1$ million SNe Ia that can be achieved by the proposed D2k survey with the LSST telescope (Zhan et al. 2008), multiplicative error of $\\sim 0.5\\%$ for source galaxies at $z_s\\sim 1$ can be detected and la...
see Type I decision error see Type II decision error
-1, 12, 22; 4-11; 5-46 to 51; 7-7; 8-1, 2, 15, 16, 22, 24, 27; A-5; N-16 areas 2-5 HSA/scoping 2 INDEX see Type I decision error see Type II decision error 91b material 3-5 Amin area-25; 8-11, 17 area evaluation & HSA 3-11 classification 2-4, 5, 17, 28; 4-11 contaminated 2-3 land
DATA COMPRESSION USING WAVELETS: ERROR ...
1910-90-11T23:59:59.000Z
algorithms that introduce differences between the original and compressed data in ... to choose an error metric that parallels the human visual system, so that image .... signal data along a communications channel, one sends integer codes that ...
The Challenge of Quantum Error Correction.
Fominov, Yakov
in the design of physical bits. #12;What we need Hardware requirements: 1. Many 103-104 / R individual bits (R flip classical error b. Phase error 0exp( ( ) )z i E t dt = - Fluctuates 1. Need hardware error #12;Classical error correction by the software and hardware. , / 2 0 Hardware error correction: Ising
Error Rate Comparison during Polymerase Chain Reaction by DNA Polymerase
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
McInerney, Peter; Adams, Paul; Hadi, Masood Z.
2014-01-01T23:59:59.000Z
As larger-scale cloning projects become more prevalent, there is an increasing need for comparisons among high fidelity DNA polymerases used for PCR amplification. All polymerases marketed for PCR applications are tested for fidelity properties (i.e., error rate determination) by vendors, and numerous literature reports have addressed PCR enzyme fidelity. Nonetheless, it is often difficult to make direct comparisons among different enzymes due to numerous methodological and analytical differences from study to study. We have measured the error rates for 6 DNA polymerases commonly used in PCR applications, including 3 polymerases typically used for cloning applications requiring high fidelity. Error ratemore »measurement values reported here were obtained by direct sequencing of cloned PCR products. The strategy employed here allows interrogation of error rate across a very large DNA sequence space, since 94 unique DNA targets were used as templates for PCR cloning. The six enzymes included in the study,Taqpolymerase, AccuPrime-Taq High Fidelity, KOD Hot Start, clonedPfupolymerase, Phusion Hot Start, andPwopolymerase, we find the lowest error rates withPfu, Phusion, andPwopolymerases. Error rates are comparable for these 3 enzymes and are >10x lower than the error rate observed withTaqpolymerase. Mutation spectra are reported, with the 3 high fidelity enzymes displaying broadly similar types of mutations. For these enzymes, transition mutations predominate, with little bias observed for type of transition.« less
Unequal error protection of subband coded bits
Devalla, Badarinath
1994-01-01T23:59:59.000Z
Source coded data can be separated into different classes based on their susceptibility to channel errors. Errors in the Important bits cause greater distortion in the reconstructed signal. This thesis presents an Unequal Error Protection scheme...
Unequal error protection of subband coded bits
Devalla, Badarinath
1994-01-01T23:59:59.000Z
Source coded data can be separated into different classes based on their susceptibility to channel errors. Errors in the Important bits cause greater distortion in the reconstructed signal. This thesis presents an Unequal Error Protection scheme...
Goal-oriendted local a posteriori error estimator for H(div)
2011-12-15T23:59:59.000Z
Dec 15, 2011 ... error estimator measures the pollution effect from the outside region of D and provides a basis for local refinement in order to efficiently ...
Using doppler radar images to estimate aircraft navigational heading error
Doerry, Armin W. (Albuquerque, NM); Jordan, Jay D. (Albuquerque, NM); Kim, Theodore J. (Albuquerque, NM)
2012-07-03T23:59:59.000Z
A yaw angle error of a motion measurement system carried on an aircraft for navigation is estimated from Doppler radar images captured using the aircraft. At least two radar pulses aimed at respectively different physical locations in a targeted area are transmitted from a radar antenna carried on the aircraft. At least two Doppler radar images that respectively correspond to the at least two transmitted radar pulses are produced. These images are used to produce an estimate of the yaw angle error.
Communication error detection using facial expressions
Wang, Sy Bor, 1976-
2008-01-01T23:59:59.000Z
Automatic detection of communication errors in conversational systems typically rely only on acoustic cues. However, perceptual studies have indicated that speakers do exhibit visual communication error cues passively ...
Harmonic Analysis Errors in Calculating Dipole,
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
to reduce the harmonic field calculation errors. A conformal transfor- mation of a multipole magnet into a dipole reduces these errors. Dipole Magnet Calculations A triangular...
ERROR ANALYSIS OF COMPOSITE SHOCK INTERACTION PROBLEMS.
LEE,T.MU,Y.ZHAO,M.GLIMM,J.LI,X.YE,K.
2004-07-26T23:59:59.000Z
We propose statistical models of uncertainty and error in numerical solutions. To represent errors efficiently in shock physics simulations we propose a composition law. The law allows us to estimate errors in the solutions of composite problems in terms of the errors from simpler ones as discussed in a previous paper. In this paper, we conduct a detailed analysis of the errors. One of our goals is to understand the relative magnitude of the input uncertainty vs. the errors created within the numerical solution. In more detail, we wish to understand the contribution of each wave interaction to the errors observed at the end of the simulation.
Type Measurement Type Measurement Type Measurement Type Measurement Catch Composition - Pelagic codes M Male F Female I Indeterminate U Unknown (not inspected) #12;Type Measurement Type Measurement Type Measurement Type Measurement Photos Comment Length 1 Version 1.2 6/2011 HookNo. Species name
Repeated quantum error correction on a continuously encoded qubit by real-time feedback
Julia Cramer; Norbert Kalb; M. Adriaan Rol; Bas Hensen; Machiel S. Blok; Matthew Markham; Daniel J. Twitchen; Ronald Hanson; Tim H. Taminiau
2015-08-06T23:59:59.000Z
Reliable quantum information processing in the face of errors is a major fundamental and technological challenge. Quantum error correction protects quantum states by encoding a logical quantum bit (qubit) in multiple physical qubits, so that errors can be detected without affecting the encoded state. To be compatible with universal fault-tolerant computations, it is essential that the states remain encoded at all times and that errors are actively corrected. Here we demonstrate such active error correction on a continuously protected qubit using a diamond quantum processor. We encode a logical qubit in three long-lived nuclear spins, repeatedly detect phase errors by non-destructive measurements using an ancilla electron spin, and apply corrections on the encoded state by real-time feedback. The actively error-corrected qubit is robust against errors and multiple rounds of error correction prevent errors from accumulating. Moreover, by correcting phase errors naturally induced by the environment, we demonstrate that encoded quantum superposition states are preserved beyond the dephasing time of the best physical qubit used in the encoding. These results establish a powerful platform for the fundamental investigation of error correction under different types of noise and mark an important step towards fault-tolerant quantum information processing.
Reducing Collective Quantum State Rotation Errors with Reversible Dephasing
Kevin C. Cox; Matthew A. Norcia; Joshua M. Weiner; Justin G. Bohnet; James K. Thompson
2014-07-16T23:59:59.000Z
We demonstrate that reversible dephasing via inhomogeneous broadening can greatly reduce collective quantum state rotation errors, and observe the suppression of rotation errors by more than 21 dB in the context of collective population measurements of the spin states of an ensemble of $2.1 \\times 10^5$ laser cooled and trapped $^{87}$Rb atoms. The large reduction in rotation noise enables direct resolution of spin state populations 13(1) dB below the fundamental quantum projection noise limit. Further, the spin state measurement projects the system into an entangled state with 9.5(5) dB of directly observed spectroscopic enhancement (squeezing) relative to the standard quantum limit, whereas no enhancement would have been obtained without the suppression of rotation errors.
Kernel Regression in the Presence of Correlated Errors Kernel Regression in the Presence in nonparametric regression is difficult in the presence of correlated errors. There exist a wide variety vector machines for regression. Keywords: nonparametric regression, correlated errors, bandwidth choice
Time reversal in thermoacoustic tomography - an error estimate
Hristova, Yulia
2008-01-01T23:59:59.000Z
The time reversal method in thermoacoustic tomography is used for approximating the initial pressure inside a biological object using measurements of the pressure wave made outside the object. This article presents error estimates for the time reversal method in the cases of variable, non-trapping sound speeds.
Output error identification of hydrogenerator conduit dynamics
Vogt, M.A.; Wozniak, L. (Illinois Univ., Urbana, IL (USA)); Whittemore, T.R. (Bureau of Reclamation, Denver, CO (USA))
1989-09-01T23:59:59.000Z
Two output error model reference adaptive identifiers are considered for estimating the parameters in a reduced order gate position to pressure model for the hydrogenerator. This information may later be useful in an adaptive controller. Gradient and sensitivity functions identifiers are discussed for the hydroelectric application and connections are made between their structural differences and relative performance. Simulations are presented to support the conclusion that the latter algorithm is more robust, having better disturbance rejection and less plant model mismatch sensitivity. For identification from recorded plant data from step gate inputs, the other algorithm even fails to converge. A method for checking the estimated parameters is developed by relating the coefficients in the reduced order model to head, an externally measurable parameter.
Error field and magnetic diagnostic modeling for W7-X
Lazerson, Sam A. [PPPL; Gates, David A. [PPPL; NEILSON, GEORGE H. [PPPL; OTTE, M.; Bozhenkov, S.; Pedersen, T. S.; GEIGER, J.; LORE, J.
2014-07-01T23:59:59.000Z
The prediction, detection, and compensation of error fields for the W7-X device will play a key role in achieving a high beta (? = 5%), steady state (30 minute pulse) operating regime utilizing the island divertor system [1]. Additionally, detection and control of the equilibrium magnetic structure in the scrape-off layer will be necessary in the long-pulse campaign as bootstrapcurrent evolution may result in poor edge magnetic structure [2]. An SVD analysis of the magnetic diagnostics set indicates an ability to measure the toroidal current and stored energy, while profile variations go undetected in the magnetic diagnostics. An additional set of magnetic diagnostics is proposed which improves the ability to constrain the equilibrium current and pressure profiles. However, even with the ability to accurately measure equilibrium parameters, the presence of error fields can modify both the plasma response and diverter magnetic field structures in unfavorable ways. Vacuum flux surface mapping experiments allow for direct measurement of these modifications to magnetic structure. The ability to conduct such an experiment is a unique feature of stellarators. The trim coils may then be used to forward model the effect of an applied n = 1 error field. This allows the determination of lower limits for the detection of error field amplitude and phase using flux surface mapping. *Research supported by the U.S. DOE under Contract No. DE-AC02-09CH11466 with Princeton University.
Approximate error conjugation gradient minimization methods
Kallman, Jeffrey S
2013-05-21T23:59:59.000Z
In one embodiment, a method includes selecting a subset of rays from a set of all rays to use in an error calculation for a constrained conjugate gradient minimization problem, calculating an approximate error using the subset of rays, and calculating a minimum in a conjugate gradient direction based on the approximate error. In another embodiment, a system includes a processor for executing logic, logic for selecting a subset of rays from a set of all rays to use in an error calculation for a constrained conjugate gradient minimization problem, logic for calculating an approximate error using the subset of rays, and logic for calculating a minimum in a conjugate gradient direction based on the approximate error. In other embodiments, computer program products, methods, and systems are described capable of using approximate error in constrained conjugate gradient minimization problems.
Characterization of quantum dynamics using quantum error correction
S. Omkar; R. Srikanth; S. Banerjee
2015-01-27T23:59:59.000Z
Characterizing noisy quantum processes is important to quantum computation and communication (QCC), since quantum systems are generally open. To date, all methods of characterization of quantum dynamics (CQD), typically implemented by quantum process tomography, are \\textit{off-line}, i.e., QCC and CQD are not concurrent, as they require distinct state preparations. Here we introduce a method, "quantum error correction based characterization of dynamics", in which the initial state is any element from the code space of a quantum error correcting code that can protect the state from arbitrary errors acting on the subsystem subjected to the unknown dynamics. The statistics of stabilizer measurements, with possible unitary pre-processing operations, are used to characterize the noise, while the observed syndrome can be used to correct the noisy state. Our method requires at most $2(4^n-1)$ configurations to characterize arbitrary noise acting on $n$ qubits.
Impact of Turbulence Closures and Numerical Errors for the Optimization of Flow Control Devices
Paris-Sud XI, Université de
Impact of Turbulence Closures and Numerical Errors for the Optimization of Flow Control Devices J the use of a Kriging-based global optimization method to determine optimal control parameters conduct an optimization process and measure the impact of numerical and modeling errors on the optimal
Evaluating specific error characteristics of microwave-derived cloud liquid water products
Christopher, Sundar A.
of cloud LWP products globally using concurrent data from visible/ infrared satellite sensors. The approachEvaluating specific error characteristics of microwave-derived cloud liquid water products Thomas J microwave satellite measurements. Using coincident visible/infrared satellite data, errors are isolated
Henry L. Haselgrove; Peter P. Rohde
2007-07-03T23:59:59.000Z
In a recent study [Rohde et al., quant-ph/0603130 (2006)] of several quantum error correcting protocols designed for tolerance against qubit loss, it was shown that these protocols have the undesirable effect of magnifying the effects of depolarization noise. This raises the question of which general properties of quantum error-correcting codes might explain such an apparent trade-off between tolerance to located and unlocated error types. We extend the counting argument behind the well-known quantum Hamming bound to derive a bound on the weights of combinations of located and unlocated errors which are correctable by nondegenerate quantum codes. Numerical results show that the bound gives an excellent prediction to which combinations of unlocated and located errors can be corrected with high probability by certain large degenerate codes. The numerical results are explained partly by showing that the generalized bound, like the original, is closely connected to the information-theoretic quantity the quantum coherent information. However, we also show that as a measure of the exact performance of quantum codes, our generalized Hamming bound is provably far from tight.
On a fatal error in tachyonic physics
Edward Kapu?cik
2013-08-10T23:59:59.000Z
A fatal error in the famous paper on tachyons by Gerald Feinberg is pointed out. The correct expressions for energy and momentum of tachyons are derived.
Original Article Error Bounds and Metric Subregularity
2014-06-18T23:59:59.000Z
theory of error bounds of extended real-valued functions. Another objective is to ... Another observation is that neighbourhood V in the original definition of metric.
Wind Power Forecasting Error Distributions over Multiple Timescales (Presentation)
Hodge, B. M.; Milligan, M.
2011-07-01T23:59:59.000Z
This presentation presents some statistical analysis of wind power forecast errors and error distributions, with examples using ERCOT data.
Error Mining on Dependency Trees Claire Gardent
Paris-Sud XI, Université de
Error Mining on Dependency Trees Claire Gardent CNRS, LORIA, UMR 7503 Vandoeuvre-l`es-Nancy, F-l`es-Nancy, F-54600, France shashi.narayan@loria.fr Abstract In recent years, error mining approaches were propose an algorithm for mining trees and ap- ply it to detect the most likely sources of gen- eration
SEU induced errors observed in microprocessor systems
Asenek, V.; Underwood, C.; Oldfield, M. [Univ. of Surrey, Guildford (United Kingdom). Surrey Space Centre] [Univ. of Surrey, Guildford (United Kingdom). Surrey Space Centre; Velazco, R.; Rezgui, S.; Cheynet, P. [TIMA Lab., Grenoble (France)] [TIMA Lab., Grenoble (France); Ecoffet, R. [Centre National d`Etudes Spatiales, Toulouse (France)] [Centre National d`Etudes Spatiales, Toulouse (France)
1998-12-01T23:59:59.000Z
In this paper, the authors present software tools for predicting the rate and nature of observable SEU induced errors in microprocessor systems. These tools are built around a commercial microprocessor simulator and are used to analyze real satellite application systems. Results obtained from simulating the nature of SEU induced errors are shown to correlate with ground-based radiation test data.
Inference for Model Error Allan Seheult
Oakley, Jeremy
Reservoirs, Model Error, Reification, Thermohaline Circulation. 1 Introduction Mathematical models of complex that the uncertainties associated with both calibrating a mathematical model to observations on a physical system specification exercise of model error with the cosmologists, linked to an extensive analysis of model
Nonparametric Regression with Correlated Errors Jean Opsomer
Wang, Yuedong
Nonparametric Regression with Correlated Errors Jean Opsomer Iowa State University Yuedong Wang Nonparametric regression techniques are often sensitive to the presence of correlation in the errors splines and wavelet regression under correlation, both for short-range and long-range dependence
Stabilizer Formalism for Operator Quantum Error Correction
Poulin, D
2005-01-01T23:59:59.000Z
Operator quantum error correction is a recently developed theory that provides a generalized framework for active error correction and passive error avoiding schemes. In this paper, we describe these codes in the language of the stabilizer formalism of standard quantum error correction theory. This is achieved by adding a "gauge" group to the standard stabilizer definition of a code. Gauge transformations leave the encoded information unchanged; their effect is absorbed by virtual gauge qubits that do not carry useful information. We illustrate the construction by identifying a gauge symmetry in Shor's 9-qubit code that allows us to remove 3 of its 8 stabilizer generators, leading to a simpler decoding procedure without affecting its essential properties. This opens the path to possible improvement of the error threshold of fault tolerant quantum computing. We also derive a modified Hamming bound that applies to all stabilizer codes, including degenerate ones.
Stabilizer Formalism for Operator Quantum Error Correction
David Poulin
2006-06-14T23:59:59.000Z
Operator quantum error correction is a recently developed theory that provides a generalized framework for active error correction and passive error avoiding schemes. In this paper, we describe these codes in the stabilizer formalism of standard quantum error correction theory. This is achieved by adding a "gauge" group to the standard stabilizer definition of a code that defines an equivalence class between encoded states. Gauge transformations leave the encoded information unchanged; their effect is absorbed by virtual gauge qubits that do not carry useful information. We illustrate the construction by identifying a gauge symmetry in Shor's 9-qubit code that allows us to remove 4 of its 8 stabilizer generators, leading to a simpler decoding procedure and a wider class of logical operations without affecting its essential properties. This opens the path to possible improvements of the error threshold of fault-tolerant quantum computing.
Optimal measurement strategies for effective suppression of drift errors
Yashchuk, Valeriy V.
2009-01-01T23:59:59.000Z
Device for X-ray Optics at BESSY,” Proc. of AIP 705, 847–slope trace obtained with BESSY NOM (courtesy of Frankmeasuring instrument, the BESSY NOM, 16 proves the accuracy
Measurement Errors and Outliers in Seasonal Unit Root Testing
Haldrup, Niels Prof.; Montanes, Antonio; Sansó, Andreu
2000-01-01T23:59:59.000Z
hi4Li|iThiti? UiLu|itiL|*iht? Lh_ih|LU@hh)L|@ThLTih? uihi?i|ih4? i|i TLttM*ii t|i? UiLu|itiL|*ihtci@}@? @TT*)|i t|@|t|hi@|ih_i|@* ? |ihT@Tihc|itiL|*iht@hihi*@|i_|L|iTihL_Luih)
Measure of Diffusion Model Error for Thermal Radiation Transport
Kumar, Akansha
2013-04-19T23:59:59.000Z
cm2 sh keV c Speed of light 2:99 102 cmsh D Di usion coe cient ( 13 t ) cm F Radiation ux jkcm2 sh k Time iteration t Di erence between consecutive time steps shakes(sh) hi Size of spatial cell, i cm ! Direction of photon propagation ster... +1 0 dE Z 4 d !r ; E; ! ; t : (4.2) The term ! F ( !r ; t) is the \\ ux", given by ! J ( !r ; t) = Z +1 0 dE Z 4 d ! !r ; E; ! ; t : (4.3) The above equation of transfer for speci c intensity is equivalent...
Errors Associated with Sampling and Measurement of Solids
Clark, Shirley E.
Harrisburg; Middletown, PA, USA 2 University of Alabama, Tuscaloosa, AL, USA With assistance from many past
On earthquake predictability measurement: Information score and error diagram
Kagan, Yan Y.
2007-01-01T23:59:59.000Z
short-term earthquake prediction, Science , 236 , 1563-1567.G. (2006), Testing earthquake prediction methods: \\The WestStrategies in strong earthquake prediction, Phys. Earth
Error Detection and Error Classification: Failure Awareness in Data Transfer Scheduling
Louisiana State University; Balman, Mehmet; Kosar, Tevfik
2010-10-27T23:59:59.000Z
Data transfer in distributed environment is prone to frequent failures resulting from back-end system level problems, like connectivity failure which is technically untraceable by users. Error messages are not logged efficiently, and sometimes are not relevant/useful from users point-of-view. Our study explores the possibility of an efficient error detection and reporting system for such environments. Prior knowledge about the environment and awareness of the actual reason behind a failure would enable higher level planners to make better and accurate decisions. It is necessary to have well defined error detection and error reporting methods to increase the usability and serviceability of existing data transfer protocols and data management systems. We investigate the applicability of early error detection and error classification techniques and propose an error reporting framework and a failure-aware data transfer life cycle to improve arrangement of data transfer operations and to enhance decision making of data transfer schedulers.
Saeki, Hiroshi, E-mail: saeki@spring8.or.jp; Magome, Tamotsu, E-mail: saeki@spring8.or.jp [Japan Synchrotron Radiation Research Institute, SPring-8, Kohto 1-1-1, Sayo, Hyogo 679-5198 (Japan)
2014-10-06T23:59:59.000Z
To compensate pressure-measurement errors caused by a synchrotron radiation environment, a precise method using a hot-cathode-ionization-gauge head with correcting electrode, was developed and tested in a simulation experiment with excess electrons in the SPring-8 storage ring. This precise method to improve the measurement accuracy, can correctly reduce the pressure-measurement errors caused by electrons originating from the external environment, and originating from the primary gauge filament influenced by spatial conditions of the installed vacuum-gauge head. As the result of the simulation experiment to confirm the performance reducing the errors caused by the external environment, the pressure-measurement error using this method was approximately less than several percent in the pressure range from 10{sup ?5} Pa to 10{sup ?8} Pa. After the experiment, to confirm the performance reducing the error caused by spatial conditions, an additional experiment was carried out using a sleeve and showed that the improved function was available.
Quantum error-correcting codes and devices
Gottesman, Daniel (Los Alamos, NM)
2000-10-03T23:59:59.000Z
A method of forming quantum error-correcting codes by first forming a stabilizer for a Hilbert space. A quantum information processing device can be formed to implement such quantum codes.
Organizational Errors: Directions for Future Research
Carroll, John Stephen
The goal of this chapter is to promote research about organizational errors—i.e., the actions of multiple organizational participants that deviate from organizationally specified rules and can potentially result in adverse ...
Errors and paradoxes in quantum mechanics
D. Rohrlich
2007-08-28T23:59:59.000Z
Errors and paradoxes in quantum mechanics, entry in the Compendium of Quantum Physics: Concepts, Experiments, History and Philosophy, ed. F. Weinert, K. Hentschel, D. Greenberger and B. Falkenburg (Springer), to appear
Simulating Bosonic Baths with Error Bars
Mischa P. Woods; M. Cramer; M. B. Plenio
2015-04-07T23:59:59.000Z
We derive rigorous truncation-error bounds for the spin-boson model and its generalizations to arbitrary quantum systems interacting with bosonic baths. For the numerical simulation of such baths the truncation of both, the number of modes and the local Hilbert-space dimensions is necessary. We derive super-exponential Lieb--Robinson-type bounds on the error when restricting the bath to finitely-many modes and show how the error introduced by truncating the local Hilbert spaces may be efficiently monitored numerically. In this way we give error bounds for approximating the infinite system by a finite-dimensional one. As a consequence, numerical simulations such as the time-evolving density with orthogonal polynomials algorithm (TEDOPA) now allow for the fully certified treatment of the system-environment interaction.
Probabilistic growth of large entangled states with low error accumulation
Yuichiro Matsuzaki; Simon C Benjamin; Joseph Fitzsimons
2009-08-03T23:59:59.000Z
The creation of complex entangled states, resources that enable quantum computation, can be achieved via simple 'probabilistic' operations which are individually likely to fail. However, typical proposals exploiting this idea carry a severe overhead in terms of the accumulation of errors. Here we describe an method that can rapidly generate large entangled states with an error accumulation that depends only logarithmically on the failure probability. We find that the approach may be practical for success rates in the sub-10% range, while ultimately becoming unfeasible at lower rates. The assumptions that we make, including parallelism and high connectivity, are appropriate for real systems including measurement-induced entanglement. This result therefore shows the feasibility for real devices based on such an approach.
Parameters and error of a theoretical model
Moeller, P.; Nix, J.R.; Swiatecki, W.
1986-09-01T23:59:59.000Z
We propose a definition for the error of a theoretical model of the type whose parameters are determined from adjustment to experimental data. By applying a standard statistical method, the maximum-likelihoodlmethod, we derive expressions for both the parameters of the theoretical model and its error. We investigate the derived equations by solving them for simulated experimental and theoretical quantities generated by use of random number generators. 2 refs., 4 tabs.
Evaluating operating system vulnerability to memory errors.
Ferreira, Kurt Brian; Bridges, Patrick G. (University of New Mexico); Pedretti, Kevin Thomas Tauke; Mueller, Frank (North Carolina State University); Fiala, David (North Carolina State University); Brightwell, Ronald Brian
2012-05-01T23:59:59.000Z
Reliability is of great concern to the scalability of extreme-scale systems. Of particular concern are soft errors in main memory, which are a leading cause of failures on current systems and are predicted to be the leading cause on future systems. While great effort has gone into designing algorithms and applications that can continue to make progress in the presence of these errors without restarting, the most critical software running on a node, the operating system (OS), is currently left relatively unprotected. OS resiliency is of particular importance because, though this software typically represents a small footprint of a compute node's physical memory, recent studies show more memory errors in this region of memory than the remainder of the system. In this paper, we investigate the soft error vulnerability of two operating systems used in current and future high-performance computing systems: Kitten, the lightweight kernel developed at Sandia National Laboratories, and CLE, a high-performance Linux-based operating system developed by Cray. For each of these platforms, we outline major structures and subsystems that are vulnerable to soft errors and describe methods that could be used to reconstruct damaged state. Our results show the Kitten lightweight operating system may be an easier target to harden against memory errors due to its smaller memory footprint, largely deterministic state, and simpler system structure.
Quantifying truncation errors in effective field theory
R. J. Furnstahl; N. Klco; D. R. Phillips; S. Wesolowski
2015-06-03T23:59:59.000Z
Bayesian procedures designed to quantify truncation errors in perturbative calculations of quantum chromodynamics observables are adapted to expansions in effective field theory (EFT). In the Bayesian approach, such truncation errors are derived from degree-of-belief (DOB) intervals for EFT predictions. Computation of these intervals requires specification of prior probability distributions ("priors") for the expansion coefficients. By encoding expectations about the naturalness of these coefficients, this framework provides a statistical interpretation of the standard EFT procedure where truncation errors are estimated using the order-by-order convergence of the expansion. It also permits exploration of the ways in which such error bars are, and are not, sensitive to assumptions about EFT-coefficient naturalness. We first demonstrate the calculation of Bayesian probability distributions for the EFT truncation error in some representative examples, and then focus on the application of chiral EFT to neutron-proton scattering. Epelbaum, Krebs, and Mei{\\ss}ner recently articulated explicit rules for estimating truncation errors in such EFT calculations of few-nucleon-system properties. We find that their basic procedure emerges generically from one class of naturalness priors considered, and that all such priors result in consistent quantitative predictions for 68% DOB intervals. We then explore several methods by which the convergence properties of the EFT for a set of observables may be used to check the statistical consistency of the EFT expansion parameter.
The Impact of Soil Sampling Errors on Variable Rate Fertilization
R. L. Hoskinson; R C. Rope; L G. Blackwood; R D. Lee; R K. Fink
2004-07-01T23:59:59.000Z
Variable rate fertilization of an agricultural field is done taking into account spatial variability in the soil’s characteristics. Most often, spatial variability in the soil’s fertility is the primary characteristic used to determine the differences in fertilizers applied from one point to the next. For several years the Idaho National Engineering and Environmental Laboratory (INEEL) has been developing a Decision Support System for Agriculture (DSS4Ag) to determine the economically optimum recipe of various fertilizers to apply at each site in a field, based on existing soil fertility at the site, predicted yield of the crop that would result (and a predicted harvest-time market price), and the current costs and compositions of the fertilizers to be applied. Typically, soil is sampled at selected points within a field, the soil samples are analyzed in a lab, and the lab-measured soil fertility of the point samples is used for spatial interpolation, in some statistical manner, to determine the soil fertility at all other points in the field. Then a decision tool determines the fertilizers to apply at each point. Our research was conducted to measure the impact on the variable rate fertilization recipe caused by variability in the measurement of the soil’s fertility at the sampling points. The variability could be laboratory analytical errors or errors from variation in the sample collection method. The results show that for many of the fertility parameters, laboratory measurement error variance exceeds the estimated variability of the fertility measure across grid locations. These errors resulted in DSS4Ag fertilizer recipe recommended application rates that differed by up to 138 pounds of urea per acre, with half the field differing by more than 57 pounds of urea per acre. For potash the difference in application rate was up to 895 pounds per acre and over half the field differed by more than 242 pounds of potash per acre. Urea and potash differences accounted for almost 87% of the cost difference. The sum of these differences could result in a $34 per acre cost difference for the fertilization. Because of these differences, better analysis or better sampling methods may need to be done, or more samples collected, to ensure that the soil measurements are truly representative of the field’s spatial variability.
Hamlen, Kevin W.
Investigating SANS/CWE Top 25 Programming Errors. 1 Investigating the SANS/CWE Top 25 Programming Errors List Running Title: Investigating SANS/CWE Top 25 Programming Errors. Investigating the SANS;Investigating SANS/CWE Top 25 Programming Errors. 2 Investigating the SANS/CWE Top 25 Programming Errors List
Structural power flow measurement
Falter, K.J.; Keltie, R.F.
1988-12-01T23:59:59.000Z
Previous investigations of structural power flow through beam-like structures resulted in some unexplained anomalies in the calculated data. In order to develop structural power flow measurement as a viable technique for machine tool design, the causes of these anomalies needed to be found. Once found, techniques for eliminating the errors could be developed. Error sources were found in the experimental apparatus itself as well as in the instrumentation. Although flexural waves are the carriers of power in the experimental apparatus, at some frequencies longitudinal waves were excited which were picked up by the accelerometers and altered power measurements. Errors were found in the phase and gain response of the sensors and amplifiers used for measurement. A transfer function correction technique was employed to compensate for these instrumentation errors.
Error Detection and Recovery for Robot Motion Planning with Uncertainty
Donald, Bruce Randall
1987-07-01T23:59:59.000Z
Robots must plan and execute tasks in the presence of uncertainty. Uncertainty arises from sensing errors, control errors, and uncertainty in the geometry of the environment. The last, which is called model error, has ...
A systems approach to reducing utility billing errors
Ogura, Nori
2013-01-01T23:59:59.000Z
Many methods for analyzing the possibility of errors are practiced by organizations who are concerned about safety and error prevention. However, in situations where the error occurrence is random and difficult to track, ...
Progress in Understanding Error-field Physics in NSTX Spherical Torus Plasmas
E. Menard, R.E. Bell, D.A. Gates, S.P. Gerhardt, J.-K. Park, S.A. Sabbagh, J.W. Berkery, A. Egan, J. Kallman, S.M. Kaye, B. LeBlanc, Y.Q. Liu, A. Sontag, D. Swanson, H. Yuh, W. Zhu and the NSTX Research Team
2010-05-19T23:59:59.000Z
The low aspect ratio, low magnetic field, and wide range of plasma beta of NSTX plasmas provide new insight into the origins and effects of magnetic field errors. An extensive array of magnetic sensors has been used to analyze error fields, to measure error field amplification, and to detect resistive wall modes in real time. The measured normalized error-field threshold for the onset of locked modes shows a linear scaling with plasma density, a weak to inverse dependence on toroidal field, and a positive scaling with magnetic shear. These results extrapolate to a favorable error field threshold for ITER. For these low-beta locked-mode plasmas, perturbed equilibrium calculations find that the plasma response must be included to explain the empirically determined optimal correction of NSTX error fields. In high-beta NSTX plasmas exceeding the n=1 no-wall stability limit where the RWM is stabilized by plasma rotation, active suppression of n=1 amplified error fields and the correction of recently discovered intrinsic n=3 error fields have led to sustained high rotation and record durations free of low-frequency core MHD activity. For sustained rotational stabilization of the n=1 RWM, both the rotation threshold and magnitude of the amplification are important. At fixed normalized dissipation, kinetic damping models predict rotation thresholds for RWM stabilization to scale nearly linearly with particle orbit frequency. Studies for NSTX find that orbit frequencies computed in general geometry can deviate significantly from those computed in the high aspect ratio and circular plasma cross-section limit, and these differences can strongly influence the predicted RWM stability. The measured and predicted RWM stability is found to be very sensitive to the E × B rotation profile near the plasma edge, and the measured critical rotation for the RWM is approximately a factor of two higher than predicted by the MARS-F code using the semi-kinetic damping model.
Global Error bounds for systems of convex polynomials over ...
2011-11-11T23:59:59.000Z
This paper is devoted to study the Lipschitzian/Holderian type global error ...... set is not neccessarily compact, we obtain the Hölder global error bound result.
Running jobs error: "inet_arp_address_lookup"
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
jobs error: "inetarpaddresslookup" Resolved: Running jobs error: "inetarpaddresslookup" September 22, 2013 by Helen He (0 Comments) Symptom: After the Hopper August 14...
Characterization and removal of errors due to local magnetic anomalies in directional drilling of Geophysics, Colorado School of Mines Summary Directional drilling has evolved over the last few decades utilizes a technique known as magnetic Measurement While Drilling (MWD). Vector measurements of geomagnetic
Optimal error estimates for corrected trapezoidal rules
Talvila, Erik
2012-01-01T23:59:59.000Z
Corrected trapezoidal rules are proved for $\\int_a^b f(x)\\,dx$ under the assumption that $f"\\in L^p([a,b])$ for some $1\\leq p\\leq\\infty$. Such quadrature rules involve the trapezoidal rule modified by the addition of a term $k[f'(a)-f'(b)]$. The coefficient $k$ in the quadrature formula is found that minimizes the error estimates. It is shown that when $f'$ is merely assumed to be continuous then the optimal rule is the trapezoidal rule itself. In this case error estimates are in terms of the Alexiewicz norm. This includes the case when $f"$ is integrable in the Henstock--Kurzweil sense or as a distribution. All error estimates are shown to be sharp for the given assumptions on $f"$. It is shown how to make these formulas exact for all cubic polynomials $f$. Composite formulas are computed for uniform partitions.
An error correcting procedure for imperfect supervised, nonparametric classification
Ferrell, Dennis Ray
1973-01-01T23:59:59.000Z
ON INFORMATION THEORY . is active) . I'or simplicity in writing, Pr(B=B. ) will be ab- j breviated by Pr(B. ), and f(x/B=B ) will be abbreviated by j f (x/B. ) . The basic problem is, upon observing x, to determine j which class is active. If complete... to be B , r (x), is r (x) ( L Pr(B /x) i=1 The conditional probability of error can be minimized over j by assigning to a measurement x, the label value B such that minimizes r (x) . The rule which will do this is Bayes rule, b*. The resulting...
Mather, Mara
Running head: STEREOTYPE THREAT REDUCES MEMORY ERRORS Stereotype threat can reduce older adults, 90089-0191. Phone: 213-740-6772. Email: barbersa@usc.edu #12;STEREOTYPE THREAT REDUCES MEMORY ERRORS 2 Abstract (144 words) Stereotype threat often incurs the cost of reducing the amount of information
On the Error in QR Integration
Dieci, Luca; Van Vleck, Erik
2008-03-07T23:59:59.000Z
] . . . [R(t2, t1) +E2][R(t1, t0) +E1]R(t0) , k = 1, 2, . . . , where Q(tk) is the exact Q-factor at tk and the triangular transitions R(tj , tj?1) are also the exact ones. Moreover, the factors Ej , j = 1, . . . , k, are bounded in norm by the local error... committed during integration of the relevant differential equations; see Theorems 3.1 and 3.16.” We will henceforth simply write (2.7) ?Ej? ? ?, j = 1, 2, . . . , and stress that ? is computable, in fact controllable, in terms of local error tolerances...
Recent experiences with error estimation and adaptivity
Haque, Khalid Ansar
1991-01-01T23:59:59.000Z
RECENT EXPERIENCES WITH ERROR ESTIMATION AND ADAPTIVITY A Thesis by K HA LID ANSA R I I A & )UE Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE December 1991 Major Subject: Aerospace Engineering RECENT EXPERIENCES WITH ERROR ESTIMATION AND ADAPTIVITY A Thesis by KHALID ANSAR HAQUE Approved as to style and content by: W b4 f. ou Lou (i s T. Strouboulis (Chair of Committee) W. E...
Laser Phase Errors in Seeded FELs
Ratner, D.; Fry, A.; Stupakov, G.; White, W.; /SLAC
2012-03-28T23:59:59.000Z
Harmonic seeding of free electron lasers has attracted significant attention from the promise of transform-limited pulses in the soft X-ray region. Harmonic multiplication schemes extend seeding to shorter wavelengths, but also amplify the spectral phase errors of the initial seed laser, and may degrade the pulse quality. In this paper we consider the effect of seed laser phase errors in high gain harmonic generation and echo-enabled harmonic generation. We use simulations to confirm analytical results for the case of linearly chirped seed lasers, and extend the results for arbitrary seed laser envelope and phase.
A self-checking fiber optic dosimeter for monitoring common errors in brachytherapy applications
Yin, Y.; Lambert, J.; Yang, S.; McKenzie, D. R.; Jackson, M.; Suchowerska, N. [Physics School, University of Sydney, New South Wales 2006 (Australia); Physics School, University of Sydney, New South Wales 2006 (Australia) and Department of Radiation Oncology, Royal Prince Alfred Hospital, New South Wales 2050 (Australia); Physics School, University of Sydney, New South Wales 2006 (Australia); Department of Radiation Oncology, Royal Prince Alfred Hospital, New South Wales 2050 (Australia); Physics School, University of Sydney, New South Wales 2006 (Australia) and Department of Radiation Oncology, Royal Prince Alfred Hospital, New South Wales 2050 (Australia)
2009-07-15T23:59:59.000Z
Scintillation dosimetry with optical fiber readout [fiber optic dosimetry (FOD)] requires accurate measurement of light intensity. It is therefore vulnerable to loss of calibration if any changes occur in the efficiency of the optical pathway between the scintillator and the light detector. The authors show in this article that common types of errors that arise during clinical use for brachytherapy applications can be quantified using a light emitting diode to stimulate the scintillator, the so-called LED-FOD method, in an integrated and easy-to-use control unit that incorporates a compact peripheral component interconnect extension for instrumentation. Common sources of error include bending and mechanical compression of the fiber optic components and changes in the temperature of the scintillator. The authors show that the method can detect all the common errors studied in this work and that different types of errors can result in different correlations between the LED stimulated signal and the brachytherapy source signal. For a single-type error the LED-FOD can be used easily for system diagnosis and validation with the possibility to correct the dosimeter reading if the correlation between the LED stimulated signal and the brachytherapy source signal can be defined. For more complex errors, resulting from two or more errors occurring simultaneously, the LED-FOD method can also allow the clinician to make a judgment on the reliability of the dosimeter reading. This self-checking method can enhance the clinical robustness of the FOD for achieving accurate dose control.
Analysis of Solar Two Heliostat Tracking Error Sources
Jones, S.A.; Stone, K.W.
1999-01-28T23:59:59.000Z
This paper explores the geometrical errors that reduce heliostat tracking accuracy at Solar Two. The basic heliostat control architecture is described. Then, the three dominant error sources are described and their effect on heliostat tracking is visually illustrated. The strategy currently used to minimize, but not truly correct, these error sources is also shown. Finally, a novel approach to minimizing error is presented.
High Performance Dense Linear System Solver with Soft Error Resilience
Dongarra, Jack
High Performance Dense Linear System Solver with Soft Error Resilience Peng Du, Piotr Luszczek systems, and in some scientific applications C/R is not applicable for soft error at all due to error) high performance dense linear system solver with soft error resilience. By adopting a mathematical
Distribution of Wind Power Forecasting Errors from Operational Systems (Presentation)
Hodge, B. M.; Ela, E.; Milligan, M.
2011-10-01T23:59:59.000Z
This presentation offers new data and statistical analysis of wind power forecasting errors in operational systems.
Lateral boundary errors in regional numerical weather
?umer, Slobodan
Lateral boundary errors in regional numerical weather prediction models Author: Ana Car Advisor weather services for short- range forecasts. These models are covering smaller areas with higher reso Introduction Equations for numerical weather prediction (NWP) are mathematical represen- ation of physical
Corley, Megan Anne
1998-01-01T23:59:59.000Z
. In many of the buildings, the ESL opted to use existing flowmeters and differential pressure transmitters installed by contractors for the University. The purpose of this study is to determine measurement error associated with the differential pressure...
Makarenkov, Vladimir
- mentaldatarequiresan efficientautomaticroutinefor theselection of hits. Unfortunately, random and systematic errors can
Quantum Latin squares and unitary error bases
Benjamin Musto; Jamie Vicary
2015-04-10T23:59:59.000Z
In this paper we introduce quantum Latin squares, combinatorial quantum objects which generalize classical Latin squares, and investigate their applications in quantum computer science. Our main results are on applications to unitary error bases (UEBs), basic structures in quantum information which lie at the heart of procedures such as teleportation, dense coding and error correction. We present a new method for constructing a UEB from a quantum Latin square equipped with extra data. Developing construction techniques for UEBs has been a major activity in quantum computation, with three primary methods proposed: shift-and-multiply, Hadamard, and algebraic. We show that our new approach simultaneously generalizes the shift-and-multiply and Hadamard methods. Furthermore, we explicitly construct a UEB using our technique which we prove cannot be obtained from any of these existing methods.
Gross error detection in process data
Singh, Gurmeet
1992-01-01T23:59:59.000Z
, 1991), with many optimum properties, seems to have been untapped by chemical engineers. We first review the background of the Tr test, and present relevant properties of the test. IV. A Hotelling's Generalization of Students t Test One of the most...: Chemical Engineering GROSS ERROR DETECTION IN PROCESS DATA A Thesis by GURMEET SINGH Approved as to style and content by: Ralph E. White (Chair of Committee) Michael Nikoloau (Member Richard B. Gri n (Member) R. W. Flummerfelt (Head...
Improving Memory Error Handling Using Linux
Carlton, Michael Andrew [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Blanchard, Sean P. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Debardeleben, Nathan A. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
2014-07-25T23:59:59.000Z
As supercomputers continue to get faster and more powerful in the future, they will also have more nodes. If nothing is done, then the amount of memory in supercomputer clusters will soon grow large enough that memory failures will be unmanageable to deal with by manually replacing memory DIMMs. "Improving Memory Error Handling Using Linux" is a process oriented method to solve this problem by using the Linux kernel to disable (offline) faulty memory pages containing bad addresses, preventing them from being used again by a process. The process of offlining memory pages simplifies error handling and results in reducing both hardware and manpower costs required to run Los Alamos National Laboratory (LANL) clusters. This process will be necessary for the future of supercomputing to allow the development of exascale computers. It will not be feasible without memory error handling to manually replace the number of DIMMs that will fail daily on a machine consisting of 32-128 petabytes of memory. Testing reveals the process of offlining memory pages works and is relatively simple to use. As more and more testing is conducted, the entire process will be automated within the high-performance computing (HPC) monitoring software, Zenoss, at LANL.
Improved measurement accuracy in a Long Trace Profiler: Compensation for laser pointing instability
Irick, S.C.
1993-08-02T23:59:59.000Z
Laser pointing instability adds to the error of slope measurements taken with the Long Trace Profiler (LTP). As with carriage pitch error, this laser pointing error must be accounted for and subtracted from the surface under test (SUT) slope measurement. In the past, a separate reference beam (REF) allowed characterization of the component of slope error from carriage pitch. However, the component of slope error from laser pointing manifests itself differently in the SUT measured slope. An analysis of angle error propagation is given, and the effect of these errors on measured slope is determined. Then a method is proposed for identifying these errors and subtracting them from the measured SUT slope function. Separate measurements of carriage pitch and laser pointing instability isolate these effects, so that the effectiveness of the error identification algorithm may be demonstrated.
Message passing in fault tolerant quantum error correction
Z. W. E. Evans; A. M. Stephens
2008-06-13T23:59:59.000Z
Inspired by Knill's scheme for message passing error detection, here we develop a scheme for message passing error correction for the nine-qubit Bacon-Shor code. We show that for two levels of concatenated error correction, where classical information obtained at the first level is used to help interpret the syndrome at the second level, our scheme will correct all cases with four physical errors. This results in a reduction of the logical failure rate relative to conventional error correction by a factor proportional to the reciprocal of the physical error rate.
Tang, A. Kevin
Correction From Nonlinear Measurements With Applications in Bad Data Detection for Power Networks Weiyu Xu power networks, due to physical constraints, indi- rect nonlinear measurement results--In this paper, we consider the problem of sparse error correction from general nonlinear measurements, which has
Measurement enhancement for state estimation
Chen, Jian
2009-05-15T23:59:59.000Z
in the power system. A robust state estimation should have the capability of keeping the system observable during different contingencies, as well as detecting and identifying the gross errors in measurement set and network topology. However, this capability...
Human error contribution to nuclear materials-handling events
Sutton, Bradley (Bradley Jordan)
2007-01-01T23:59:59.000Z
This thesis analyzes a sample of 15 fuel-handling events from the past ten years at commercial nuclear reactors with significant human error contributions in order to detail the contribution of human error to fuel-handling ...
Evolved Error Management Biases in the Attribution of Anger
Galperin, Andrew
2012-01-01T23:59:59.000Z
von Hippel, W. , Poore, J. C. , Buss, D. M. , et al. (under27, 733-763. Haselton, M. G. , & Buss, D. M. (2000). Error27, 733-763. Haselton, M. G. , & Buss, D. M. (2000). Error
Using CO2 spatial variability to quantify representation errors of satellite CO2 retrievals
Michalak, Anna M.
global data of column- averaged CO2 dry-air mole fraction (XCO2) at high spatial resolutions. These dataUsing CO2 spatial variability to quantify representation errors of satellite CO2 retrievals A. A 2008; published 29 August 2008. [1] Satellite measurements of column-averaged CO2 dry- air mole
Quantifying Errors Associated with Satellite Sampling of Offshore Wind S.C. Pryor1,2
1 Quantifying Errors Associated with Satellite Sampling of Offshore Wind Speeds S.C. Pryor1,2 , R, Bloomington, IN47405, USA. Tel: 1-812-855-5155. Fax: 1-812-855-1661 Email: spryor@indiana.edu 2 Dept. of Wind an attractive proposition for measuring wind speeds over the oceans because in principle they also offer
A Probability Model For Errors in the Numerical Solutions of a Partial Di erential Equation
New York at Stoney Brook, State University of
into a petroleum reservoir, and observe the out ow, through production well(s). The rele- vant out ow variable permeability. We measure the solution error as the di#11;erence between the oil production rates (oil cut the extent to which the coarse grid oil production rate is suÆcient to distinguish among geologies
Automatic detection of dimension errors in spreadsheets Chris Chambers, Martin Erwig
Erwig, Martin
University, USA a r t i c l e i n f o Keywords: Spreadsheet Dimension Unit of measurement Static analysis Inference rule Error detection a b s t r a c t We present a reasoning system for inferring dimension information in spreadsheets. This system can be used to check the consistency of spreadsheet formulas and thus
Franklin Trouble Shooting and Error Messages
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirt DocumentationSitesWeather6Environmental1 |MAgnEt forFirstFourth FridayTrouble Shooting and Error
Error Analysis in Nuclear Density Functional Theory
Nicolas Schunck; Jordan D. McDonnell; Jason Sarich; Stefan M. Wild; Dave Higdon
2014-07-11T23:59:59.000Z
Nuclear density functional theory (DFT) is the only microscopic, global approach to the structure of atomic nuclei. It is used in numerous applications, from determining the limits of stability to gaining a deep understanding of the formation of elements in the universe or the mechanisms that power stars and reactors. The predictive power of the theory depends on the amount of physics embedded in the energy density functional as well as on efficient ways to determine a small number of free parameters and solve the DFT equations. In this article, we discuss the various sources of uncertainties and errors encountered in DFT and possible methods to quantify these uncertainties in a rigorous manner.
A Taxonomy of Number Entry Error Sarah Wiseman
Subramanian, Sriram
A Taxonomy of Number Entry Error Sarah Wiseman UCLIC MPEB, Malet Place London, WC1E 7JE sarah and the subsequent process of creating a taxonomy of errors from the information gathered. A total of 345 errors were. These codes are then organised into a taxonomy similar to that of Zhang et al (2004). We show how
Susceptibility of Commodity Systems and Software to Memory Soft Errors
Riska, Alma
Susceptibility of Commodity Systems and Software to Memory Soft Errors Alan Messer, Member, IEEE Abstract--It is widely understood that most system downtime is acounted for by programming errors transient errors in computer system hardware due to external factors, such as cosmic rays. This work
Predictors of Threat and Error Management: Identification of Core
Predictors of Threat and Error Management: Identification of Core Nontechnical Skills In normal flight operations, crews are faced with a variety of external threats and commit a range of errors of these threats and errors therefore forms an essential element of enhancing performance and minimizing risk
Bolstered Error Estimation Ulisses Braga-Neto a,c
Braga-Neto, Ulisses
the bolstered error estimators proposed in this paper, as part of a larger library for classification and error of the data. It has a direct geometric interpretation and can be easily applied to any classification rule as smoothed error estimation. In some important cases, such as a linear classification rule with a Gaussian
Error rate and power dissipation in nano-logic devices
Kim, Jong Un
2004-01-01T23:59:59.000Z
Current-controlled logic and single electron logic processors have been investigated with respect to thermal-induced bit error. A maximal error rate for both logic processors is regarded as one bit-error/year/chip. A maximal clock frequency...
Polian, Ilia
of soft errors in modern microprocessors has been reported to never lead to a system failure. Any techniques are enhanced by a methodology to handle soft errors on address bits. Furthermore, we demonstrate]. Consequently, many state-of-the art systems provide soft error detection and correction capabilities [Hass 89
Nikolopoulos, Georgios M.; Ranade, Kedar S.; Alber, Gernot [Institut fuer Angewandte Physik, Technische Universitaet Darmstadt, 64289 Darmstadt (Germany)
2006-03-15T23:59:59.000Z
We investigate the error tolerance of quantum cryptographic protocols using d-level systems. In particular, we focus on prepare-and-measure schemes that use two mutually unbiased bases and a key-distillation procedure with two-way classical communication. For arbitrary quantum channels, we obtain a sufficient condition for secret-key distillation which, in the case of isotropic quantum channels, yields an analytic expression for the maximally tolerable error rate of the cryptographic protocols under consideration. The difference between the tolerable error rate and its theoretical upper bound tends slowly to zero for sufficiently large dimensions of the information carriers.
Technological Advancements and Error Rates in Radiation Therapy Delivery
Margalit, Danielle N., E-mail: dmargalit@partners.org [Harvard Radiation Oncology Program, Boston, MA (United States); Harvard Cancer Consortium and Brigham and Women's Hospital/Dana Farber Cancer Institute, Boston, MA (United States); Chen, Yu-Hui; Catalano, Paul J.; Heckman, Kenneth; Vivenzio, Todd; Nissen, Kristopher; Wolfsberger, Luciant D.; Cormack, Robert A.; Mauch, Peter; Ng, Andrea K. [Harvard Cancer Consortium and Brigham and Women's Hospital/Dana Farber Cancer Institute, Boston, MA (United States)
2011-11-15T23:59:59.000Z
Purpose: Technological advances in radiation therapy (RT) delivery have the potential to reduce errors via increased automation and built-in quality assurance (QA) safeguards, yet may also introduce new types of errors. Intensity-modulated RT (IMRT) is an increasingly used technology that is more technically complex than three-dimensional (3D)-conformal RT and conventional RT. We determined the rate of reported errors in RT delivery among IMRT and 3D/conventional RT treatments and characterized the errors associated with the respective techniques to improve existing QA processes. Methods and Materials: All errors in external beam RT delivery were prospectively recorded via a nonpunitive error-reporting system at Brigham and Women's Hospital/Dana Farber Cancer Institute. Errors are defined as any unplanned deviation from the intended RT treatment and are reviewed during monthly departmental quality improvement meetings. We analyzed all reported errors since the routine use of IMRT in our department, from January 2004 to July 2009. Fisher's exact test was used to determine the association between treatment technique (IMRT vs. 3D/conventional) and specific error types. Effect estimates were computed using logistic regression. Results: There were 155 errors in RT delivery among 241,546 fractions (0.06%), and none were clinically significant. IMRT was commonly associated with errors in machine parameters (nine of 19 errors) and data entry and interpretation (six of 19 errors). IMRT was associated with a lower rate of reported errors compared with 3D/conventional RT (0.03% vs. 0.07%, p = 0.001) and specifically fewer accessory errors (odds ratio, 0.11; 95% confidence interval, 0.01-0.78) and setup errors (odds ratio, 0.24; 95% confidence interval, 0.08-0.79). Conclusions: The rate of errors in RT delivery is low. The types of errors differ significantly between IMRT and 3D/conventional RT, suggesting that QA processes must be uniquely adapted for each technique. There was a lower error rate with IMRT compared with 3D/conventional RT, highlighting the need for sustained vigilance against errors common to more traditional treatment techniques.
Locked modes and magnetic field errors in MST
Almagri, A.F.; Assadi, S.; Prager, S.C.; Sarff, J.S.; Kerst, D.W.
1992-06-01T23:59:59.000Z
In the MST reversed field pinch magnetic oscillations become stationary (locked) in the lab frame as a result of a process involving interactions between the modes, sawteeth, and field errors. Several helical modes become phase locked to each other to form a rotating localized disturbance, the disturbance locks to an impulsive field error generated at a sawtooth crash, the error fields grow monotonically after locking (perhaps due to an unstable interaction between the modes and field error), and over the tens of milliseconds of growth confinement degrades and the discharge eventually terminates. Field error control has been partially successful in eliminating locking.
Analysis of Errors in a Special Perturbations Satellite Orbit Propagator
Beckerman, M.; Jones, J.P.
1999-02-01T23:59:59.000Z
We performed an analysis of error densities for the Special Perturbations orbit propagator using data for 29 satellites in orbits of interest to Space Shuttle and International Space Station collision avoidance. We find that the along-track errors predominate. These errors increase monotonically over each 36-hour prediction interval. The predicted positions in the along-track direction progressively either leap ahead of or lag behind the actual positions. Unlike the along-track errors the radial and cross-track errors oscillate about their nearly zero mean values. As the number of observations per fit interval decline the along-track prediction errors, and amplitudes of the radial and cross-track errors, increase.
In Search of a Taxonomy for Classifying Qualitative Spreadsheet Errors
Przasnyski, Zbigniew; Seal, Kala Chand
2011-01-01T23:59:59.000Z
Most organizations use large and complex spreadsheets that are embedded in their mission-critical processes and are used for decision-making purposes. Identification of the various types of errors that can be present in these spreadsheets is, therefore, an important control that organizations can use to govern their spreadsheets. In this paper, we propose a taxonomy for categorizing qualitative errors in spreadsheet models that offers a framework for evaluating the readiness of a spreadsheet model before it is released for use by others in the organization. The classification was developed based on types of qualitative errors identified in the literature and errors committed by end-users in developing a spreadsheet model for Panko's (1996) "Wall problem". Closer inspection of the errors reveals four logical groupings of the errors creating four categories of qualitative errors. The usability and limitations of the proposed taxonomy and areas for future extension are discussed.
Integrating human related errors with technical errors to determine causes behind offshore accidents
Aamodt, Agnar
errors were embedded as an integral part of the oil well drilling opera- tion. To reduce the number assessment of the failure. The method is based on a knowledge model of the oil-well drilling process. All of non-productive time (NPT) during oil-well drilling. NPT exhibits a much lower declining trend than
Ali, Zulfiqar
2013-01-01T23:59:59.000Z
267-70 (2001). 2. P. Z. Takacs, “X-ray optics metrology,” inHandbook of Optics, 3rd ed. , Vol. V , M. Bass, Ed. ,X-ray Grazing Incidence Optics for European XFEL: Analysis
Quantum Error Correction with magnetic molecules
José J. Baldoví; Salvador Cardona-Serra; Juan M. Clemente-Juan; Luis Escalera-Moreno; Alejandro Gaita-Ariño; Guillermo Mínguez Espallargas
2014-08-22T23:59:59.000Z
Quantum algorithms often assume independent spin qubits to produce trivial $|\\uparrow\\rangle=|0\\rangle$, $|\\downarrow\\rangle=|1\\rangle$ mappings. This can be unrealistic in many solid-state implementations with sizeable magnetic interactions. Here we show that the lower part of the spectrum of a molecule containing three exchange-coupled metal ions with $S=1/2$ and $I=1/2$ is equivalent to nine electron-nuclear qubits. We derive the relation between spin states and qubit states in reasonable parameter ranges for the rare earth $^{159}$Tb$^{3+}$ and for the transition metal Cu$^{2+}$, and study the possibility to implement Shor's Quantum Error Correction code on such a molecule. We also discuss recently developed molecular systems that could be adequate from an experimental point of view.
Huang, Weidong
2011-01-01T23:59:59.000Z
Surface slope error of concentrator is one of the main factors to influence the performance of the solar concentrated collectors which cause deviation of reflected ray and reduce the intercepted radiation. This paper presents the general equation to calculate the standard deviation of reflected ray error from slope error through geometry optics, applying the equation to calculate the standard deviation of reflected ray error for 5 kinds of solar concentrated reflector, provide typical results. The results indicate that the slope error is transferred to the reflected ray in more than 2 folds when the incidence angle is more than 0. The equation for reflected ray error is generally fit for all reflection surfaces, and can also be applied to control the error in designing an abaxial optical system.
Ghezzehei, T.A.
2008-05-29T23:59:59.000Z
Application of time domain reflectometry (TDR) in soil hydrology often involves the conversion of TDR-measured dielectric permittivity to water content using universal calibration equations (empirical or physically based). Deviations of soil-specific calibrations from the universal calibrations have been noted and are usually attributed to peculiar composition of soil constituents, such as high content of clay and/or organic matter. Although it is recognized that soil disturbance by TDR waveguides may have impact on measurement errors, to our knowledge, there has not been any quantification of this effect. In this paper, we introduce a method that estimates this error by combining two models: one that describes soil compaction around cylindrical objects and another that translates change in bulk density to evolution of soil water retention characteristics. Our analysis indicates that the compaction pattern depends on the mechanical properties of the soil at the time of installation. The relative error in water content measurement depends on the compaction pattern as well as the water content and water retention properties of the soil. Illustrative calculations based on measured soil mechanical and hydrologic properties from the literature indicate that the measurement errors of using a standard three-prong TDR waveguide could be up to 10%. We also show that the error scales linearly with the ratio of rod radius to the interradius spacing.
Deterministic treatment of model error in geophysical data assimilation
Carrassi, Alberto
2015-01-01T23:59:59.000Z
This chapter describes a novel approach for the treatment of model error in geophysical data assimilation. In this method, model error is treated as a deterministic process fully correlated in time. This allows for the derivation of the evolution equations for the relevant moments of the model error statistics required in data assimilation procedures, along with an approximation suitable for application to large numerical models typical of environmental science. In this contribution we first derive the equations for the model error dynamics in the general case, and then for the particular situation of parametric error. We show how this deterministic description of the model error can be incorporated in sequential and variational data assimilation procedures. A numerical comparison with standard methods is given using low-order dynamical systems, prototypes of atmospheric circulation, and a realistic soil model. The deterministic approach proves to be very competitive with only minor additional computational c...
Trial application of a technique for human error analysis (ATHEANA)
Bley, D.C. [Buttonwood Consulting, Inc., Oakton, VA (United States); Cooper, S.E. [Science Applications International Corp., Reston, VA (United States); Parry, G.W. [NUS, Gaithersburg, MD (United States)] [and others
1996-10-01T23:59:59.000Z
The new method for HRA, ATHEANA, has been developed based on a study of the operating history of serious accidents and an understanding of the reasons why people make errors. Previous publications associated with the project have dealt with the theoretical framework under which errors occur and the retrospective analysis of operational events. This is the first attempt to use ATHEANA in a prospective way, to select and evaluate human errors within the PSA context.
Cosmic Ray Spectral Deformation Caused by Energy Determination Errors
Per Carlson; Conny Wannemark
2005-05-10T23:59:59.000Z
Using simulation methods, distortion effects on energy spectra caused by errors in the energy determination have been investigated. For cosmic ray proton spectra, falling steeply with kinetic energy E as E-2.7, significant effects appear. When magnetic spectrometers are used to determine the energy, the relative error increases linearly with the energy and distortions with a sinusoidal form appear starting at an energy that depends significantly on the error distribution but at an energy lower than that corresponding to the Maximum Detectable Rigidity of the spectrometer. The effect should be taken into consideration when comparing data from different experiments, often having different error distributions.
Error estimates for the Euler discretization of an optimal control ...
Joseph FrÃ©dÃ©ric Bonnans
2014-12-10T23:59:59.000Z
Dec 10, 2014 ... Abstract: We study the error introduced in the solution of an optimal control problem with first order state constraints, for which the trajectories ...
On Error Estimates of the Penalty Method for Unsteady Navier ...
Nov 26, 2002 ... http://WWW.jstor.org/about/terms.html. ... However, the best error estimates available to the author's knowledge" ... AMS subject classi?cations.
New Fractional Error Bounds for Polynomial Systems with ...
2014-07-27T23:59:59.000Z
techniques are largely based on variational analysis and generalized differentiation, ...... Example 3.10 (failure of global error bounds for polynomial systems).
A technique for human error analysis (ATHEANA)
Cooper, S.E.; Ramey-Smith, A.M.; Wreathall, J.; Parry, G.W. [and others
1996-05-01T23:59:59.000Z
Probabilistic risk assessment (PRA) has become an important tool in the nuclear power industry, both for the Nuclear Regulatory Commission (NRC) and the operating utilities. Human reliability analysis (HRA) is a critical element of PRA; however, limitations in the analysis of human actions in PRAs have long been recognized as a constraint when using PRA. A multidisciplinary HRA framework has been developed with the objective of providing a structured approach for analyzing operating experience and understanding nuclear plant safety, human error, and the underlying factors that affect them. The concepts of the framework have matured into a rudimentary working HRA method. A trial application of the method has demonstrated that it is possible to identify potentially significant human failure events from actual operating experience which are not generally included in current PRAs, as well as to identify associated performance shaping factors and plant conditions that have an observable impact on the frequency of core damage. A general process was developed, albeit in preliminary form, that addresses the iterative steps of defining human failure events and estimating their probabilities using search schemes. Additionally, a knowledge- base was developed which describes the links between performance shaping factors and resulting unsafe actions.
Camp, Charles H; Cicerone, Marcus T
2015-01-01T23:59:59.000Z
Coherent anti-Stokes Raman scattering (CARS) microspectroscopy has demonstrated significant potential for biological and materials imaging. To date, however, the primary mechanism of disseminating CARS spectroscopic information is through pseudocolor imagery, which explicitly neglects a vast majority of the hyperspectral data. Furthermore, current paradigms in CARS spectral processing do not lend themselves to quantitative sample-to-sample comparability. The primary limitation stems from the need to accurately measure the so-called nonresonant background (NRB) that is used to extract the chemically-sensitive Raman information from the raw spectra. Measurement of the NRB on a pixel-by-pixel basis is a nontrivial task; thus, reference NRB from glass or water are typically utilized, resulting in error between the actual and estimated amplitude and phase. In this manuscript, we present a new methodology for extracting the Raman spectral features that significantly suppresses these errors through phase detrending ...
Kinematic Error Correction for Minimally Invasive Surgical Robots
in two likely sources of kinematic error: port displacement and instrument shaft flexion. For a quasi. To reach the surgical site near the chest wall, the instrument shaft applies significant torque to the port, and the instrument shaft to bend. These kinematic errors impair positioning of the robot and cause deviations from
ARTIFICIAL INTELLIGENCE 223 A Geometric Approach to Error
Richardson, David
may not even exist. For this reason we investigate error detection and recovery (EDR) strategies. We may not even exist. For this reason we investigate error detection and recovery (EDR ) strategies. We and implementational questions remain. The second contribution is a formal, geometric approach to EDR. While EDR
Error Control of Iterative Linear Solvers for Integrated Groundwater Models
Bai, Zhaojun
gradient method or Generalized Minimum RESidual (GMRES) method, is how to choose the residual tolerance for integrated groundwater models, which are implicitly coupled to another model, such as surface water models the correspondence between the residual error in the preconditioned linear system and the solution error. Using
Numerical Construction of Likelihood Distributions and the Propagation of Errors
J. Swain; L. Taylor
1997-12-12T23:59:59.000Z
The standard method for the propagation of errors, based on a Taylor series expansion, is approximate and frequently inadequate for realistic problems. A simple and generic technique is described in which the likelihood is constructed numerically, thereby greatly facilitating the propagation of errors.
Mining API Error-Handling Specifications from Source Code
Xie, Tao
Mining API Error-Handling Specifications from Source Code Mithun Acharya and Tao Xie Department it difficult to mine error-handling specifications through manual inspection of source code. In this paper, we, without any user in- put. In our framework, we adapt a trace generation technique to distinguish
Calibration and Error in Placental Molecular Clocks: A Conservative
Hadly, Elizabeth
Calibration and Error in Placental Molecular Clocks: A Conservative Approach Using for calibrating both mitogenomic and nucleogenomic placental timescales. We applied these reestimates to the most calibration error may inflate the power of the molecular clock when testing the time of ordinal
Error detection through consistency checking Peng Gong* Lan Mu#
Silver, Whendee
Error detection through consistency checking Peng Gong* Lan Mu# *Center for Assessment & Monitoring Hall, University of California, Berkeley, Berkeley, CA 94720-3110 gong@nature.berkeley.edu mulan, accessibility, and timeliness as recorded in the lineage data (Chen and Gong, 1998). Spatial error refers
ERROR-TOLERANT MULTI-MODAL SENSOR FUSION Farinaz Koushanfar*
Potkonjak, Miodrag
ERROR-TOLERANT MULTI-MODAL SENSOR FUSION Farinaz Koushanfar* , Sasha Slijepcevic , Miodrag is multi-modal sensor fusion, where data from sensors of dif- ferent modalities are combined in order applications, including multi- modal sensor fusion, is to ensure that all of the techniques and tools are error
Mutual information, bit error rate and security in Wójcik's scheme
Zhanjun Zhang
2004-02-21T23:59:59.000Z
In this paper the correct calculations of the mutual information of the whole transmission, the quantum bit error rate (QBER) are presented. Mistakes of the general conclusions relative to the mutual information, the quantum bit error rate (QBER) and the security in W\\'{o}jcik's paper [Phys. Rev. Lett. {\\bf 90}, 157901(2003)] have been pointed out.
Kernel Regression with Correlated Errors K. De Brabanter
Kernel Regression with Correlated Errors K. De Brabanter , J. De Brabanter , , J.A.K. Suykens B: It is a well-known problem that obtaining a correct bandwidth in nonparametric regression is difficult support vector machines for regression. Keywords: nonparametric regression, correlated errors, short
Solving LWE problem with bounded errors in polynomial time
International Association for Cryptologic Research (IACR)
Solving LWE problem with bounded errors in polynomial time Jintai Ding1,2 Southern Chinese call the learning with bounded errors (LWBE) problems, we can solve it with complexity O(nD ). Keywords, this problem corresponds to the learning parity with noise (LPN) problem. There are several ways to solve
Hess-Flores, M
2011-11-10T23:59:59.000Z
Scene reconstruction from video sequences has become a prominent computer vision research area in recent years, due to its large number of applications in fields such as security, robotics and virtual reality. Despite recent progress in this field, there are still a number of issues that manifest as incomplete, incorrect or computationally-expensive reconstructions. The engine behind achieving reconstruction is the matching of features between images, where common conditions such as occlusions, lighting changes and texture-less regions can all affect matching accuracy. Subsequent processes that rely on matching accuracy, such as camera parameter estimation, structure computation and non-linear parameter optimization, are also vulnerable to additional sources of error, such as degeneracies and mathematical instability. Detection and correction of errors, along with robustness in parameter solvers, are a must in order to achieve a very accurate final scene reconstruction. However, error detection is in general difficult due to the lack of ground-truth information about the given scene, such as the absolute position of scene points or GPS/IMU coordinates for the camera(s) viewing the scene. In this dissertation, methods are presented for the detection, factorization and correction of error sources present in all stages of a scene reconstruction pipeline from video, in the absence of ground-truth knowledge. Two main applications are discussed. The first set of algorithms derive total structural error measurements after an initial scene structure computation and factorize errors into those related to the underlying feature matching process and those related to camera parameter estimation. A brute-force local correction of inaccurate feature matches is presented, as well as an improved conditioning scheme for non-linear parameter optimization which applies weights on input parameters in proportion to estimated camera parameter errors. Another application is in reconstruction pre-processing, where an algorithm detects and discards frames that would lead to inaccurate feature matching, camera pose estimation degeneracies or mathematical instability in structure computation based on a residual error comparison between two different match motion models. The presented algorithms were designed for aerial video but have been proven to work across different scene types and camera motions, and for both real and synthetic scenes.
Error Control of Iterative Linear Solvers for Integrated Groundwater Models
Dixon, Matthew; Brush, Charles; Chung, Francis; Dogrul, Emin; Kadir, Tariq
2010-01-01T23:59:59.000Z
An open problem that arises when using modern iterative linear solvers, such as the preconditioned conjugate gradient (PCG) method or Generalized Minimum RESidual method (GMRES) is how to choose the residual tolerance in the linear solver to be consistent with the tolerance on the solution error. This problem is especially acute for integrated groundwater models which are implicitly coupled to another model, such as surface water models, and resolve both multiple scales of flow and temporal interaction terms, giving rise to linear systems with variable scaling. This article uses the theory of 'forward error bound estimation' to show how rescaling the linear system affects the correspondence between the residual error in the preconditioned linear system and the solution error. Using examples of linear systems from models developed using the USGS GSFLOW package and the California State Department of Water Resources' Integrated Water Flow Model (IWFM), we observe that this error bound guides the choice of a prac...
Grid-scale Fluctuations and Forecast Error in Wind Power
Bel, G; Toots, M; Bandi, M M
2015-01-01T23:59:59.000Z
The fluctuations in wind power entering an electrical grid (Irish grid) were analyzed and found to exhibit correlated fluctuations with a self-similar structure, a signature of large-scale correlations in atmospheric turbulence. The statistical structure of temporal correlations for fluctuations in generated and forecast time series was used to quantify two types of forecast error: a timescale error ($e_{\\tau}$) that quantifies the deviations between the high frequency components of the forecast and the generated time series, and a scaling error ($e_{\\zeta}$) that quantifies the degree to which the models fail to predict temporal correlations in the fluctuations of the generated power. With no $a$ $priori$ knowledge of the forecast models, we suggest a simple memory kernel that reduces both the timescale error ($e_{\\tau}$) and the scaling error ($e_{\\zeta}$).
An Efficient Approach towards Mitigating Soft Errors Risks
Sadi, Muhammad Sheikh; Uddin, Md Nazim; Jürjens, Jan
2011-01-01T23:59:59.000Z
Smaller feature size, higher clock frequency and lower power consumption are of core concerns of today's nano-technology, which has been resulted by continuous downscaling of CMOS technologies. The resultant 'device shrinking' reduces the soft error tolerance of the VLSI circuits, as very little energy is needed to change their states. Safety critical systems are very sensitive to soft errors. A bit flip due to soft error can change the value of critical variable and consequently the system control flow can completely be changed which leads to system failure. To minimize soft error risks, a novel methodology is proposed to detect and recover from soft errors considering only 'critical code blocks' and 'critical variables' rather than considering all variables and/or blocks in the whole program. The proposed method shortens space and time overhead in comparison to existing dominant approaches.
Grid-scale Fluctuations and Forecast Error in Wind Power
G. Bel; C. P. Connaughton; M. Toots; M. M. Bandi
2015-03-29T23:59:59.000Z
The fluctuations in wind power entering an electrical grid (Irish grid) were analyzed and found to exhibit correlated fluctuations with a self-similar structure, a signature of large-scale correlations in atmospheric turbulence. The statistical structure of temporal correlations for fluctuations in generated and forecast time series was used to quantify two types of forecast error: a timescale error ($e_{\\tau}$) that quantifies the deviations between the high frequency components of the forecast and the generated time series, and a scaling error ($e_{\\zeta}$) that quantifies the degree to which the models fail to predict temporal correlations in the fluctuations of the generated power. With no $a$ $priori$ knowledge of the forecast models, we suggest a simple memory kernel that reduces both the timescale error ($e_{\\tau}$) and the scaling error ($e_{\\zeta}$).
Quantum Error Correcting Codes and the Security Proof of the BB84 Protocol
Ramesh Bhandari
2014-08-30T23:59:59.000Z
We describe the popular BB84 protocol and critically examine its security proof as presented by Shor and Preskill. The proof requires the use of quantum error correcting codes called the Calderbank-Shor-Steanne (CSS) quantum codes. These quantum codes are constructed in the quantum domain from two suitable classical linear codes, one used to correct for bit-flip errors and the other for phase-flip errors. Consequently, as a prelude to the security proof, the report reviews the essential properties of linear codes, especially the concept of cosets, before building the quantum codes that are utilized in the proof. The proof considers a security entanglement-based protocol, which is subsequently reduced to a "Prepare and Measure" protocol similar in structure to the BB84 protocol, thus establishing the security of the BB84 protocol. The proof, however, is not without assumptions, which are also enumerated. The treatment throughout is pedagogical, and this report, therefore, serves a useful tutorial for researchers, practitioners, and students, new to the field of quantum information science, in particular, quantum cryptography, as it develops the proof in a systematic manner, starting from the properties of linear codes, and then advancing to the quantum error correcting codes, which are critical to the understanding of the security proof.
Trapped Ion Quantum Error Correcting Protocols Using Only Global Operations
Joseph F. Goodwin; Benjamin J. Brown; Graham Stutter; Howard Dale; Richard C. Thompson; Terry Rudolph
2014-07-07T23:59:59.000Z
Quantum error-correcting codes are many-body entangled states that are prepared and measured using complex sequences of entangling operations. Each element of such an entangling sequence introduces noise to delicate quantum information during the encoding or reading out of the code. It is important therefore to find efficient entangling protocols to avoid the loss of information. Here we propose an experiment that uses only global entangling operations to encode an arbitrary logical qubit to either the five-qubit repetition code or the five-qubit code, with a six-ion Coulomb crystal architecture in a Penning trap. We show that the use of global operations enables us to prepare and read out these codes using only six and ten global entangling pulses, respectively. The proposed experiment also allows the acquisition of syndrome information during readout. We provide a noise analysis for the presented protocols, estimating that we can achieve a six-fold improvement in coherence time with noise as high as $\\sim 1\\%$ on each entangling operation.
Protecting PUF Error Correction by Codeword Masking
International Association for Cryptologic Research (IACR)
key generation. While the advantages of PUF- based key extraction and embedding have been shown, such as Radio Frequency Identification (RFID) tags [5], but also for high-security products like smartcards [7, because raw PUF measurements naturally involve a certain amount of noise. Dur- ing an enrollment phase
Logical Error Rate Scaling of the Toric Code
Fern H. E. Watson; Sean D. Barrett
2014-09-26T23:59:59.000Z
To date, a great deal of attention has focused on characterizing the performance of quantum error correcting codes via their thresholds, the maximum correctable physical error rate for a given noise model and decoding strategy. Practical quantum computers will necessarily operate below these thresholds meaning that other performance indicators become important. In this work we consider the scaling of the logical error rate of the toric code and demonstrate how, in turn, this may be used to calculate a key performance indicator. We use a perfect matching decoding algorithm to find the scaling of the logical error rate and find two distinct operating regimes. The first regime admits a universal scaling analysis due to a mapping to a statistical physics model. The second regime characterizes the behavior in the limit of small physical error rate and can be understood by counting the error configurations leading to the failure of the decoder. We present a conjecture for the ranges of validity of these two regimes and use them to quantify the overhead -- the total number of physical qubits required to perform error correction.
Balancing aggregation and smoothing errors in inverse models
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Turner, A. J.; Jacob, D. J.
2015-01-13T23:59:59.000Z
Inverse models use observations of a system (observation vector) to quantify the variables driving that system (state vector) by statistical optimization. When the observation vector is large, such as with satellite data, selecting a suitable dimension for the state vector is a challenge. A state vector that is too large cannot be effectively constrained by the observations, leading to smoothing error. However, reducing the dimension of the state vector leads to aggregation error as prior relationships between state vector elements are imposed rather than optimized. Here we present a method for quantifying aggregation and smoothing errors as a function ofmore »state vector dimension, so that a suitable dimension can be selected by minimizing the combined error. Reducing the state vector within the aggregation error constraints can have the added advantage of enabling analytical solution to the inverse problem with full error characterization. We compare three methods for reducing the dimension of the state vector from its native resolution: (1) merging adjacent elements (grid coarsening), (2) clustering with principal component analysis (PCA), and (3) applying a Gaussian mixture model (GMM) with Gaussian pdfs as state vector elements on which the native-resolution state vector elements are projected using radial basis functions (RBFs). The GMM method leads to somewhat lower aggregation error than the other methods, but more importantly it retains resolution of major local features in the state vector while smoothing weak and broad features.« less
Balancing aggregation and smoothing errors in inverse models
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Turner, A. J.; Jacob, D. J.
2015-06-30T23:59:59.000Z
Inverse models use observations of a system (observation vector) to quantify the variables driving that system (state vector) by statistical optimization. When the observation vector is large, such as with satellite data, selecting a suitable dimension for the state vector is a challenge. A state vector that is too large cannot be effectively constrained by the observations, leading to smoothing error. However, reducing the dimension of the state vector leads to aggregation error as prior relationships between state vector elements are imposed rather than optimized. Here we present a method for quantifying aggregation and smoothing errors as a function ofmore »state vector dimension, so that a suitable dimension can be selected by minimizing the combined error. Reducing the state vector within the aggregation error constraints can have the added advantage of enabling analytical solution to the inverse problem with full error characterization. We compare three methods for reducing the dimension of the state vector from its native resolution: (1) merging adjacent elements (grid coarsening), (2) clustering with principal component analysis (PCA), and (3) applying a Gaussian mixture model (GMM) with Gaussian pdfs as state vector elements on which the native-resolution state vector elements are projected using radial basis functions (RBFs). The GMM method leads to somewhat lower aggregation error than the other methods, but more importantly it retains resolution of major local features in the state vector while smoothing weak and broad features.« less
Doolan, P [University College London, London (United Kingdom); Massachusetts General Hospital, Boston, MA (United States); Dias, M [Massachusetts General Hospital, Boston, MA (United States); Dipartamento di Elettronica, Informazione e Bioingegneria - DEIB, Politecnico di Milano (Italy); Collins Fekete, C [Massachusetts General Hospital, Boston, MA (United States); Departement de physique, de genie physique et d'optique et Centre de recherche sur le cancer, Universite Laval, Quebec (Canada); Seco, J [Massachusetts General Hospital, Boston, MA (United States)
2014-06-01T23:59:59.000Z
Purpose: The procedure for proton treatment planning involves the conversion of the patient's X-ray CT from Hounsfield units into relative stopping powers (RSP), using a stoichiometric calibration curve (Schneider 1996). In clinical practice a 3.5% margin is added to account for the range uncertainty introduced by this process and other errors. RSPs for real tissues are calculated using composition data and the Bethe-Bloch formula (ICRU 1993). The purpose of this work is to investigate the impact that systematic errors in the stoichiometric calibration have on the proton range. Methods: Seven tissue inserts of the Gammex 467 phantom were imaged using our CT scanner. Their known chemical compositions (Watanabe 1999) were then used to calculate the theoretical RSPs, using the same formula as would be used for human tissues in the stoichiometric procedure. The actual RSPs of these inserts were measured using a Bragg peak shift measurement in the proton beam at our institution. Results: The theoretical calculation of the RSP was lower than the measured RSP values, by a mean/max error of - 1.5/-3.6%. For all seven inserts the theoretical approach underestimated the RSP, with errors variable across the range of Hounsfield units. Systematic errors for lung (average of two inserts), adipose and cortical bone were - 3.0/-2.1/-0.5%, respectively. Conclusion: There is a systematic underestimation caused by the theoretical calculation of RSP; a crucial step in the stoichiometric calibration procedure. As such, we propose that proton calibration curves should be based on measured RSPs. Investigations will be made to see if the same systematic errors exist for biological tissues. The impact of these differences on the range of proton beams, for phantoms and patient scenarios, will be investigated. This project was funded equally by the Engineering and Physical Sciences Research Council (UK) and Ion Beam Applications (Louvain-La-Neuve, Belgium)
Quantum Limits of Measurements and Uncertainty Principle
Masanao Ozawa
2015-05-19T23:59:59.000Z
In this paper, we show how the Robertson uncertainty relation gives certain intrinsic quantum limits of measurements in the most general and rigorous mathematical treatment. A general lower bound for the product of the root-mean-square measurement errors arising in joint measurements of noncommuting observables is established. We give a rigorous condition for holding of the standard quantum limit (SQL) for repeated measurements, and prove that if a measuring instrument has no larger root-mean-square preparational error than the root-mean-square measurement errors then it obeys the SQL. As shown previously, we can even construct many linear models of position measurement which circumvent this condition for the SQL.
A High-Precision Instrument for Mapping of Rotational Errors in Rotary Stages
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Xu W.; Lauer,K.; Chu,Y.; Nazaretski,E.
2014-10-02T23:59:59.000Z
A rotational stage is a key component of every X-ray instrument capable of providing tomographic or diffraction measurements. To perform accurate three-dimensional reconstructions, runout errors due to imperfect rotation (e.g. circle of confusion) must be quantified and corrected. A dedicated instrument capable of full characterization and circle of confusion mapping in rotary stages down to the sub-10 nm level has been developed. A high-stability design, with an array of five capacitive sensors, allows simultaneous measurements of wobble, radial and axial displacements. The developed instrument has been used for characterization of two mechanical stages which are part of an X-ray microscope.
Wind Power Forecasting Error Distributions: An International Comparison; Preprint
Hodge, B. M.; Lew, D.; Milligan, M.; Holttinen, H.; Sillanpaa, S.; Gomez-Lazaro, E.; Scharff, R.; Soder, L.; Larsen, X. G.; Giebel, G.; Flynn, D.; Dobschinski, J.
2012-09-01T23:59:59.000Z
Wind power forecasting is expected to be an important enabler for greater penetration of wind power into electricity systems. Because no wind forecasting system is perfect, a thorough understanding of the errors that do occur can be critical to system operation functions, such as the setting of operating reserve levels. This paper provides an international comparison of the distribution of wind power forecasting errors from operational systems, based on real forecast data. The paper concludes with an assessment of similarities and differences between the errors observed in different locations.
Jeong, Jaehoon "Paul"
Internet Measurement- System A Measurement- System B Control System GPS Satellite GPS Satellite GPS Receiver GPS Receiver 2) measurement 3) data1) command Methodology for One-way IP Performance Measurement This paper proposes a methodology for measurement of one-way IP performance metrics such as one-way delay
Servo control booster system for minimizing following error
Wise, William L. (Mountain View, CA)
1985-01-01T23:59:59.000Z
A closed-loop feedback-controlled servo system is disclosed which reduces command-to-response error to the system's position feedback resolution least increment, .DELTA.S.sub.R, on a continuous real-time basis for all operating speeds. The servo system employs a second position feedback control loop on a by exception basis, when the command-to-response error .gtoreq..DELTA.S.sub.R, to produce precise position correction signals. When the command-to-response error is less than .DELTA.S.sub.R, control automatically reverts to conventional control means as the second position feedback control loop is disconnected, becoming transparent to conventional servo control means. By operating the second unique position feedback control loop used herein at the appropriate clocking rate, command-to-response error may be reduced to the position feedback resolution least increment. The present system may be utilized in combination with a tachometer loop for increased stability.
Predicting Intentional Tax Error Using Open Source Literature and Data
for each PUMS respondent (or agent), in certain line item/taxpayer categories, allowing us to construct dis-Likelihood . . . . . . . . . . . . . . . . . . . . . . . . . 12 5 Results of Meta-Analysis 12 6 Intentional Error in Line Items/Taxpayer Categories 13 6
Inflated applicants: Attribution errors in performance evaluation by professionals
Swift, Samuel; Moore, Don; Sharek, Zachariah; Gino, Francesca
2013-01-01T23:59:59.000Z
performance among applicants from each ‘‘type’’ of school.and interview performance. Each school provided multi-yearschool, PLOS ONE | www.plosone.org July 2013 | Volume 8 | Issue 7 | e69258 Attribution Errors in Performance
Removing Systematic Errors from Rotating Shadowband Pyranometer Data Frank Vignola
Oregon, University of
of the pyranometer to briefly shade the pyranometer once a minute. Direct hori- zontal irradiance is calculated used in programs evaluating the performance of photovoltaic systems, and systematic errors in the data
Honest Confidence Intervals for the Error Variance in Stepwise Regression
Stine, Robert A.
Honest Confidence Intervals for the Error Variance in Stepwise Regression Dean P. Foster and Robert alternatives are used. These simpler algorithms (e.g., forward or backward stepwise regression) obtain
Wind Power Forecasting Error Distributions over Multiple Timescales: Preprint
Hodge, B. M.; Milligan, M.
2011-03-01T23:59:59.000Z
In this paper, we examine the shape of the persistence model error distribution for ten different wind plants in the ERCOT system over multiple timescales. Comparisons are made between the experimental distribution shape and that of the normal distribution.
A Taxonomy to Enable Error Recovery and Correction in Software Vilas Sridharan
Kaeli, David R.
A Taxonomy to Enable Error Recovery and Correction in Software Vilas Sridharan ECE Department years, reliability research has largely used the following taxonomy of errors: Undetected Errors Errors (CE). While this taxonomy is suitable to characterize hardware error detection and correction
TESLA-FEL 2009-07 Errors in Reconstruction of Difference Orbit
Contents 1 Introduction 1 2 Standard Least Squares Solution 2 3 Error Emittance and Error Twiss Parameters as the position of the reconstruction point changes, we will introduce error Twiss parameters and invariant error in the point of interest has to be achieved by matching error Twiss parameters in this point to the desired
Suboptimal quantum-error-correcting procedure based on semidefinite programming
Naoki Yamamoto; Shinji Hara; Koji Tsumura
2006-06-13T23:59:59.000Z
In this paper, we consider a simplified error-correcting problem: for a fixed encoding process, to find a cascade connected quantum channel such that the worst fidelity between the input and the output becomes maximum. With the use of the one-to-one parametrization of quantum channels, a procedure finding a suboptimal error-correcting channel based on a semidefinite programming is proposed. The effectiveness of our method is verified by an example of the bit-flip channel decoding.
Mesoscale predictability and background error convariance estimation through ensemble forecasting
Ham, Joy L
2002-01-01T23:59:59.000Z
MESOSCALE PREDICTABILITY AND BACKGROUND ERROR COVARIANCE ESTIMATION THROUGH ENSEMBLE FORECASTING A Thesis by JOY L. HAM Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE December 2002 Major Subject: Atmospheric Sciences MESOSCALE PREDICTABILITY AND BACKGROUND ERROR COVARIANCE ESTIMATION THROUGH ENSEMBLE FORECASTING A Thesis by JOY L. HAM Submitted to the Office of Graduate Studies...
Fault-Tolerant Thresholds for Encoded Ancillae with Homogeneous Errors
Bryan Eastin
2006-11-14T23:59:59.000Z
I describe a procedure for calculating thresholds for quantum computation as a function of error model given the availability of ancillae prepared in logical states with independent, identically distributed errors. The thresholds are determined via a simple counting argument performed on a single qubit of an infinitely large CSS code. I give concrete examples of thresholds thus achievable for both Steane and Knill style fault-tolerant implementations and investigate their relation to threshold estimates in the literature.
Mesoscale predictability and background error convariance estimation through ensemble forecasting
Ham, Joy L
2002-01-01T23:59:59.000Z
MESOSCALE PREDICTABILITY AND BACKGROUND ERROR COVARIANCE ESTIMATION THROUGH ENSEMBLE FORECASTING A Thesis by JOY L. HAM Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE December 2002 Major Subject: Atmospheric Sciences MESOSCALE PREDICTABILITY AND BACKGROUND ERROR COVARIANCE ESTIMATION THROUGH ENSEMBLE FORECASTING A Thesis by JOY L. HAM Submitted to the Office of Graduate Studies...
Coding Techniques for Error Correction and Rewriting in Flash Memories
Mohammed, Shoeb Ahmed
2010-10-12T23:59:59.000Z
CODING TECHNIQUES FOR ERROR CORRECTION AND REWRITING IN FLASH MEMORIES A Thesis by SHOEB AHMED MOHAMMED Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE August 2010 Major Subject: Electrical Engineering CODING TECHNIQUES FOR ERROR CORRECTION AND REWRITING IN FLASH MEMORIES A Thesis by SHOEB AHMED MOHAMMED Submitted to the Office of Graduate Studies of Texas A&M University in partial...
SU-E-T-152: Error Sensitivity and Superiority of a Protocol for 3D IMRT Quality Assurance
Gueorguiev, G [Massachusetts General Hospital, Boston, MA (United States); University of Massachusetts Lowell, Lowell, MA (United States); Cotter, C; Turcotte, J; Sharp, G; Crawford, B [Massachusetts General Hospital, Boston, MA (United States); Mah'D, M [University of Massachusetts Lowell, Lowell, MA (United States)
2014-06-01T23:59:59.000Z
Purpose: To test if the parameters included in our 3D QA protocol with current tolerance levels are able to detect certain errors and show the superiority of 3D QA method over single ion chamber measurements and 2D gamma test by detecting most of the introduced errors. The 3D QA protocol parameters are: TPS and measured average dose difference, 3D gamma test with 3mmDTA/3% test parameters, and structure volume for which the TPS predicted and measured absolute dose difference is greater than 6%. Methods: Two prostate and two thoracic step-and-shoot IMRT patients were investigated. The following errors were introduced to each original treatment plan: energy switched from 6MV to 10MV, linac jaws retracted to 15cmx15cm, 1,2,3 central MLC leaf pairs retracted behind the jaws, single central MLC leaf put in or out of the treatment field, Monitor Units (MU) increased and decreased by 1 and 3%, collimator off by 5 and 15 degrees, detector shifted by 5mm to the left and right, gantry treatment angle off by 5 and 15 degrees. QA was performed on each plan using single ion chamber, 2D ion chamber array for 2D gamma analysis and using IBA's COMPASS system for 3D QA. Results: Out of the three tested QA methods single ion chamber performs the worst not detecting subtle errors. 3D QA proves to be the superior out of the three methods detecting all of introduced errors, except 10MV and 1% MU change, and MLC rotated (those errors were not detected by any QA methods tested). Conclusion: As the way radiation is delivered evolves, so must the QA. We believe a diverse set of 3D statistical parameters applied both to OAR and target plan structures provides the highest level of QA.
Compiler-Assisted Detection of Transient Memory Errors
Tavarageri, Sanket; Krishnamoorthy, Sriram; Sadayappan, Ponnuswamy
2014-06-09T23:59:59.000Z
The probability of bit flips in hardware memory systems is projected to increase significantly as memory systems continue to scale in size and complexity. Effective hardware-based error detection and correction requires that the complete data path, involving all parts of the memory system, be protected with sufficient redundancy. First, this may be costly to employ on commodity computing platforms and second, even on high-end systems, protection against multi-bit errors may be lacking. Therefore, augmenting hardware error detection schemes with software techniques is of consider- able interest. In this paper, we consider software-level mechanisms to comprehensively detect transient memory faults. We develop novel compile-time algorithms to instrument application programs with checksum computation codes so as to detect memory errors. Unlike prior approaches that employ checksums on computational and architectural state, our scheme verifies every data access and works by tracking variables as they are produced and consumed. Experimental evaluation demonstrates that the proposed comprehensive error detection solution is viable as a completely software-only scheme. We also demonstrate that with limited hardware support, overheads of error detection can be further reduced.
Wang, S.; Sun, Y.; Huang, G.; Zhu, N.
, according to the surveys in Hong Kong and elsewhere, the direct measurement of building cooling load cannot always provide reliable measurements of building cooling load in practice due to the noises, outliers and systematic errors in measuring the water... ? is the water density (kg/L). In practice, w M is usually measured by water flow meters and and are measured by temperature sensors. It is known that these measurements are easily corrupted by measurement noises, outliers or systematic errors...
EFFECT OF MANUFACTURING ERRORS ON FIELD QUALITY OF DIPOLE MAGNETS FOR THE SSC
Meuser, R.B.
2010-01-01T23:59:59.000Z
in Fig. 2. Table 2. Manufacturing Error Mode Groups13-16, 1985 EFFECT OF MANUFACTURING ERRORS ON FIELD QUALITYMag Note-27 EFFECT OF MANUFACTURING ERRORS ON FIELO QUALITY
A new and efficient error resilient entropy code for image and video compression
Min, Jungki
1999-01-01T23:59:59.000Z
Image and video compression standards such as JPEG, MPEG, H.263 are severely sensitive to errors. Among typical error propagation mechanisms in video compression schemes, loss of block synchronization causes the worst result. Even one bit error...
LHC Network Measurement Joe Metzger
1 LHC Network Measurement Joe Metzger Nov 6 2007 LHCOPN Meeting at CERN Energy Sciences Network & Capacity RRDMA Input Errors & Output Drops PS-SNMPMA Done ?? Beta Aug 1, Package Sep 1 Visualize perf On-demand AMI MA & Scheduler Hades Owamp MP Beta Sep 15, Package Oct 1 October Done Archive perf
V-228: RealPlayer Buffer Overflow and Memory Corruption Error...
Broader source: Energy.gov (indexed) [DOE]
a memory corruption error and execute arbitrary code on the target system. IMPACT: Access control error SOLUTION: vendor recommends upgrading to version 16.0.3.51 Addthis...
Masiello, C. A; Gallagher, M. E; Randerson, J. T; Deco, R. M; Chadwick, O. A
2008-01-01T23:59:59.000Z
error on measurements (0.045 C ox units). Accuracy inOR units), with the most accurate measurements resultingmost accurate OR measurement technique (±0.011 OR units). 4.
Representing cognitive activities and errors in HRA trees
Gertman, D.I.
1992-01-01T23:59:59.000Z
A graphic representation method is presented herein for adapting an existing technology--human reliability analysis (HRA) event trees, used to support event sequence logic structures and calculations--to include a representation of the underlying cognitive activity and corresponding errors associated with human performance. The analyst is presented with three potential means of representing human activity: the NUREG/CR-1278 HRA event tree approach; the skill-, rule- and knowledge-based paradigm; and the slips, lapses, and mistakes paradigm. The above approaches for representing human activity are integrated in order to produce an enriched HRA event tree -- the cognitive event tree system (COGENT)-- which, in turn, can be used to increase the analyst's understanding of the basic behavioral mechanisms underlying human error and the representation of that error in probabilistic risk assessment. Issues pertaining to the implementation of COGENT are also discussed.
Representing cognitive activities and errors in HRA trees
Gertman, D.I.
1992-05-01T23:59:59.000Z
A graphic representation method is presented herein for adapting an existing technology--human reliability analysis (HRA) event trees, used to support event sequence logic structures and calculations--to include a representation of the underlying cognitive activity and corresponding errors associated with human performance. The analyst is presented with three potential means of representing human activity: the NUREG/CR-1278 HRA event tree approach; the skill-, rule- and knowledge-based paradigm; and the slips, lapses, and mistakes paradigm. The above approaches for representing human activity are integrated in order to produce an enriched HRA event tree -- the cognitive event tree system (COGENT)-- which, in turn, can be used to increase the analyst`s understanding of the basic behavioral mechanisms underlying human error and the representation of that error in probabilistic risk assessment. Issues pertaining to the implementation of COGENT are also discussed.
Meta learning of bounds on the Bayes classifier error
Moon, Kevin R; Hero, Alfred O
2015-01-01T23:59:59.000Z
Meta learning uses information from base learners (e.g. classifiers or estimators) as well as information about the learning problem to improve upon the performance of a single base learner. For example, the Bayes error rate of a given feature space, if known, can be used to aid in choosing a classifier, as well as in feature selection and model selection for the base classifiers and the meta classifier. Recent work in the field of f-divergence functional estimation has led to the development of simple and rapidly converging estimators that can be used to estimate various bounds on the Bayes error. We estimate multiple bounds on the Bayes error using an estimator that applies meta learning to slowly converging plug-in estimators to obtain the parametric convergence rate. We compare the estimated bounds empirically on simulated data and then estimate the tighter bounds on features extracted from an image patch analysis of sunspot continuum and magnetogram images.
Non-Gaussian numerical errors versus mass hierarchy
Y. Meurice; M. B. Oktay
2000-05-12T23:59:59.000Z
We probe the numerical errors made in renormalization group calculations by varying slightly the rescaling factor of the fields and rescaling back in order to get the same (if there were no round-off errors) zero momentum 2-point function (magnetic susceptibility). The actual calculations were performed with Dyson's hierarchical model and a simplified version of it. We compare the distributions of numerical values obtained from a large sample of rescaling factors with the (Gaussian by design) distribution of a random number generator and find significant departures from the Gaussian behavior. In addition, the average value differ (robustly) from the exact answer by a quantity which is of the same order as the standard deviation. We provide a simple model in which the errors made at shorter distance have a larger weight than those made at larger distance. This model explains in part the non-Gaussian features and why the central-limit theorem does not apply.
Factorization of correspondence and camera error for unconstrained dense correspondence applications
Knoblauch, D; Hess-Flores, M; Duchaineau, M; Kuester, F
2009-09-29T23:59:59.000Z
A correspondence and camera error analysis for dense correspondence applications such as structure from motion is introduced. This provides error introspection, opening up the possibility of adaptively and progressively applying more expensive correspondence and camera parameter estimation methods to reduce these errors. The presented algorithm evaluates the given correspondences and camera parameters based on an error generated through simple triangulation. This triangulation is based on the given dense, non-epipolar constraint, correspondences and estimated camera parameters. This provides an error map without requiring any information about the perfect solution or making assumptions about the scene. The resulting error is a combination of correspondence and camera parameter errors. An simple, fast low/high pass filter error factorization is introduced, allowing for the separation of correspondence error and camera error. Further analysis of the resulting error maps is applied to allow efficient iterative improvement of correspondences and cameras.
Peak, Derek
Are you getting an error message in UniFi Plus? (suggestion...check the auto-hint line!) In most cases, Unifi Plus does not prominently display error messages; instead, the error message and processing messages Keyboard shortcuts Instructions for accessing other blocks, windows or forms from
Comment on "Optimum Quantum Error Recovery using Semidefinite Programming"
M. Reimpell; R. F. Werner; K. Audenaert
2006-06-07T23:59:59.000Z
In a recent paper ([1]=quant-ph/0606035) it is shown how the optimal recovery operation in an error correction scheme can be considered as a semidefinite program. As a possible future improvement it is noted that still better error correction might be obtained by optimizing the encoding as well. In this note we present the result of such an improvement, specifically for the four-bit correction of an amplitude damping channel considered in [1]. We get a strict improvement for almost all values of the damping parameter. The method (and the computer code) is taken from our earlier study of such correction schemes (quant-ph/0307138).
Error estimates and specification parameters for functional renormalization
Schnoerr, David [Institute for Theoretical Physics, University of Heidelberg, D-69120 Heidelberg (Germany)] [Institute for Theoretical Physics, University of Heidelberg, D-69120 Heidelberg (Germany); Boettcher, Igor, E-mail: I.Boettcher@thphys.uni-heidelberg.de [Institute for Theoretical Physics, University of Heidelberg, D-69120 Heidelberg (Germany)] [Institute for Theoretical Physics, University of Heidelberg, D-69120 Heidelberg (Germany); Pawlowski, Jan M. [Institute for Theoretical Physics, University of Heidelberg, D-69120 Heidelberg (Germany) [Institute for Theoretical Physics, University of Heidelberg, D-69120 Heidelberg (Germany); ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung mbH, D-64291 Darmstadt (Germany); Wetterich, Christof [Institute for Theoretical Physics, University of Heidelberg, D-69120 Heidelberg (Germany)] [Institute for Theoretical Physics, University of Heidelberg, D-69120 Heidelberg (Germany)
2013-07-15T23:59:59.000Z
We present a strategy for estimating the error of truncated functional flow equations. While the basic functional renormalization group equation is exact, approximated solutions by means of truncations do not only depend on the choice of the retained information, but also on the precise definition of the truncation. Therefore, results depend on specification parameters that can be used to quantify the error of a given truncation. We demonstrate this for the BCS–BEC crossover in ultracold atoms. Within a simple truncation the precise definition of the frequency dependence of the truncated propagator affects the results, indicating a shortcoming of the choice of a frequency independent cutoff function.
Correctable noise of Quantum Error Correcting Codes under adaptive concatenation
Jesse Fern
2008-02-27T23:59:59.000Z
We examine the transformation of noise under a quantum error correcting code (QECC) concatenated repeatedly with itself, by analyzing the effects of a quantum channel after each level of concatenation using recovery operators that are optimally adapted to use error syndrome information from the previous levels of the code. We use the Shannon entropy of these channels to estimate the thresholds of correctable noise for QECCs and find considerable improvements under this adaptive concatenation. Similar methods could be used to increase quantum fault tolerant thresholds.
Error-prevention scheme with two pairs of qubits
Chu, Shih-I; Yang, Chui-Ping; Han, Siyuan
2002-09-04T23:59:59.000Z
Ei jue ie j&5ue je i& , e iP$0,1% @6#!. The expressions for HS and HSB are as follows: HS5e0~s I z 1s II z !, *Email address: cpyang@floquet.chem.ku.edu †Email address: sichu@ku.edu ‡ Email address: han@ku.eduError-prevention scheme Chui-Ping Yang.... The sche two pairs of qubits and through error-prevention proc through a decoherence-free subspace for collective p pairs; leakage out of the encoding space due to amp addition, how to construct decoherence-free states for n discussed. DOI: 10.1103/Phys...
Laser Phase Errors in Seeded Free Electron Lasers
Ratner, D.; Fry, A.; Stupakov, G.; White, W.; /SLAC
2012-04-17T23:59:59.000Z
Harmonic seeding of free electron lasers has attracted significant attention as a method for producing transform-limited pulses in the soft x-ray region. Harmonic multiplication schemes extend seeding to shorter wavelengths, but also amplify the spectral phase errors of the initial seed laser, and may degrade the pulse quality and impede production of transform-limited pulses. In this paper we consider the effect of seed laser phase errors in high gain harmonic generation and echo-enabled harmonic generation. We use simulations to confirm analytical results for the case of linearly chirped seed lasers, and extend the results for arbitrary seed laser envelope and phase.
Temperature Measurements in the Magnetic Measurement Facility
Wolf, Zachary
2010-12-13T23:59:59.000Z
Several key LCLS undulator parameter values depend strongly on temperature primarily because of the permanent magnet material the undulators are constructed with. The undulators will be tuned to have specific parameter values in the Magnetic Measurement Facility (MMF). Consequently, it is necessary for the temperature of the MMF to remain fairly constant. Requirements on undulator temperature have been established. When in use, the undulator temperature will be in the range 20.0 {+-} 0.2 C. In the MMF, the undulator tuning will be done at 20.0 {+-} 0.1 C. For special studies, the MMF temperature set point can be changed to a value between 18 C and 23 C with stability of {+-}0.1 C. In order to ensure that the MMF temperature requirements are met, the MMF must have a system to measure temperatures. The accuracy of the MMF temperature measurement system must be better than the {+-}0.1 C undulator tuning temperature tolerance, and is taken to be {+-}0.01 C. The temperature measurement system for the MMF is under construction. It is similar to a prototype system we built two years ago in the Sector 10 alignment lab at SLAC. At that time, our goal was to measure the lab temperature to {+-}0.1 C. The system has worked well for two years and has maintained its accuracy. For the MMF system, we propose better sensors and a more extensive calibration program to achieve the factor of 10 increase in accuracy. In this note we describe the measurement system under construction. We motivate our choice of system components and give an overview of the system. Most of the software for the system has been written and will be discussed. We discuss error sources in temperature measurements and show how these errors have been dealt with. The calibration system is described in detail. All the LCLS undulators must be tuned in the Magnetic Measurement Facility at the same temperature to within {+-}0.1 C. In order to ensure this, we are building a system to measure the temperature of the undulators to {+-}0.01 C. This note describes the temperature measurement system under construction.
Direct tests of measurement uncertainty relations: what it takes
Paul Busch; Neil Stevens
2015-01-17T23:59:59.000Z
The uncertainty principle being a cornerstone of quantum mechanics, it is surprising that in nearly 90 years there have been no direct tests of measurement uncertainty relations. This lacuna was due to the absence of two essential ingredients: appropriate measures of measurement error (and disturbance), and precise formulations of such relations that are {\\em universally valid}and {\\em directly testable}. We formulate two distinct forms of direct tests, based on different measures of error. We present a prototype protocol for a direct test of measurement uncertainty relations in terms of {\\em value deviation errors} (hitherto considered nonfeasible), highlighting the lack of universality of these relations. This shows that the formulation of universal, directly testable measurement uncertainty relations for {\\em state-dependent} error measures remains an important open problem. Recent experiments that were claimed to constitute invalidations of Heisenberg's error-disturbance relation are shown to conform with the spirit of Heisenberg's principle if interpreted as direct tests of measurement uncertainty relations for error measures that quantify {\\em distances between observables}.
Low-Cost Hardening of Image Processing Applications Against Soft Errors Ilia Polian1,2
Polian, Ilia
, and their hardening against soft errors becomes an issue. We propose a methodology to identify soft errors as uncritical based on their impact on the system's functionality. We call a soft error uncritical if its impact are imperceivable for the human user of the system. We focus on soft errors in the motion esti- mation subsystem
Distinguishing congestion and error losses: an ECN/ELN based scheme
Kamakshisundaram, Raguram
2001-01-01T23:59:59.000Z
error rates, like wireless links, packets are lost more due to error than due to congestion. But TCP does not differentiate between error and congestion losses and hence reduces the sending rate for losses due to error also, which unnecessarily reduces...
Error Exponent for Discrete Memoryless Multiple-Access Channels
Anastasopoulos, Achilleas
Error Exponent for Discrete Memoryless Multiple-Access Channels by Ali Nazari A dissertation Bayraktar Associate Professor Jussi Keppo #12;c Ali Nazari 2011 All Rights Reserved #12;To my parents. ii Becky Turanski, Nancy Goings, Michele Feldkamp, Ann Pace, Karen Liska and Beth Lawson for efficiently
On the error estimates for the rotational pressure-correction ...
2004-06-11T23:59:59.000Z
Dec 19, 2003 ... that may be viewed as a predictor-corrector strategy aiming at .... Since for projection methods the treatment of the nonlinear term does not ... In practice, the nonlin- .... One derives immediately from the standard PDE theory that .... Let us first write the equations that control the time increments of the errors.
Automatic Error Elimination by Horizontal Code Transfer across Multiple Applications
Polz, Martin
Automatic Error Elimination by Horizontal Code Transfer across Multiple Applications Stelios CSAIL, Cambridge, MA, USA Abstract We present Code Phage (CP), a system for automatically transferring. To the best of our knowledge, CP is the first system to automatically transfer code across multiple
Error Bounds from Extra Precise Iterative Refinement James Demmel
Li, Xiaoye Sherry
now prevented its adoption in standard subroutine libraries like LAPACK: (1) There was no standard way a reliable error bound for the computed solution. The completion of the new BLAS Technical Forum Standard [5 Cooperative Agreement No. ACI-9619020; NSF Grant Nos. ACI-9813362 and CCF-0444486; the DOE Grant Nos. DE-FG03
Control del Error para la Multirresoluci on Quincunx a la
Amat, Sergio
multirresoluci#19;on discreta no lineal de Harten. En los algoritmos de multirresoluci#19;on se transforma una obtiene ^ f L la cual debera de estar cerca de #22; f L . Por lo tanto, los algoritmos no deben de ser inestables. En este estudio, introduciremos algoritmos de control del error y de la estabilidad. Se obtendr
Urban Water Demand with Periodic Error Correction David R. Bell
Griffin, Ronald
them. Econometric estimates of residential demand for water abound (Dalhuisen et al. 2003Urban Water Demand with Periodic Error Correction by David R. Bell and Ronald C. Griffin February, Department of Agricultural Economics, Texas A&M University. #12;Abstract Monthly demand for publicly supplied
Error Control Based Model Reduction for Parameter Optimization of Elliptic
of technical devices that rely on multiscale processes, such as fuel cells or batteries. As the solutionError Control Based Model Reduction for Parameter Optimization of Elliptic Homogenization Problems optimization of elliptic multiscale problems with macroscopic optimization functionals and microscopic material
ADJOINT AND DEFECT ERROR BOUNDING AND CORRECTION FOR FUNCTIONAL ESTIMATES
Pierce, Niles A.
and Michael B. Giles Applied & Computational Mathematics, California Institute of Technology Computing to handle flows with shocks; numerical experiments confirm 4th order error estimates for a pressure integral of shocked quasi-1D Euler flow. Numerical results also demonstrate 4th order accuracy for the drag
RESIDUAL TYPE A POSTERIORI ERROR ESTIMATES FOR ELLIPTIC OBSTACLE PROBLEMS
Nochetto, Ricardo H.
to double obstacle problems are briefly discussed. Key words. a posteriori error estimates, residual Science Foundation under the grant No.19771080 and China National Key Project ``Large Scale Scientific\\Gamma satisfies / Å¸ 0 on @ and K is the convex set of admissible displacements K := fv 2 H 1 0(\\Omega\\Gamma : v
Energy efficiency of error correction for wireless communication
Havinga, Paul J.M.
-control is an important issue for mobile computing systems. This includes energy spent in the physical radio transmission and Networking Conference 1999 [7]. #12;ENERGY EFFICIENCY OF ERROR CORRECTION FOR WIRELESS COMMUNICATIONA 2 on the energy of transmission and the energy of redundancy computation. We will show that the computational cost
Selected CRC Polynomials Can Correct Errors and Thus Reduce Retransmission
Mache, Jens
sensor networks, minimizing communication is crucial to improve energy consumption and thus lifetime Correction, Reliability, Network Protocol, Low Power Comsumption I. INTRODUCTION Error detection using Cyclic of retransmitting the whole packet - improves energy consumption and thus lifetime of wireless sensor networks
A Spline Algorithm for Modeling Cutting Errors Turning Centers
Gilsinn, David E.
. Bandy Automated Production Technology Division National Institute of Standards and Technology 100 Bureau are made up of features with profiles defined by arcs and lines. An error model for turned parts must take. In the case where there is a requirement of tangency between two features, such as a line tangent to an arc
IPASS: Error Tolerant NMR Backbone Resonance Assignment by Linear Programming
Waterloo, University of
IPASS: Error Tolerant NMR Backbone Resonance Assignment by Linear Programming Babak Alipanahi1 automatically picked peaks. IPASS is proposed as a novel integer linear programming (ILP) based assignment assignment method. Although a variety of assignment approaches have been developed, none works well on noisy
Research Article Preschool Speech Error Patterns Predict Articulation
-age clinical outcomes. Many atypical speech sound errors in preschoolers may be indicative of weak phonological Outcomes in Children With Histories of Speech Sound Disorders Jonathan L. Preston,a,b Margaret Hull disorders (SSDs) predict articulation and phonological awareness (PA) outcomes almost 4 years later. Method
Edinburgh Research Explorer Prevalence and Causes of Prescribing Errors
Hall, Christopher
of Prescribing Errors: The PRescribing Outcomes for Trainee Doctors Engaged in Clinical Training (PROTECT) Study: The PRescribing Outcomes for Trainee Doctors Engaged in Clinical Training (PROTECT) Study Cristi´n Ryan1 , Sarah Kingdom, 7 Health Psychology, University of Aberdeen, Aberdeen, United Kingdom, 8 Clinical Pharmacology
Development of an Expert System for Classification of Medical Errors
Kopec, Danny
in the United States. There has been considerable speculation that these figures are either overestimated published by the Institute of Medicine (IOM) indicated that between 44,000 and 98,000 unnecessary deaths per in hospitals in the IOM report, what is of importance is that the number of deaths caused by such errors
Errors-in-variables problems in transient electromagnetic mineral exploration
Braslavsky, Julio H.
Errors-in-variables problems in transient electromagnetic mineral exploration K. Lau, J. H in transient electromagnetic mineral exploration. A specific sub-problem of interest in this area geological surveys, dia- mond drilling, and airborne mineral exploration. Our interest here is with ground
Improving STT-MRAM Density Through Multibit Error Correction
Sapatnekar, Sachin
. Traditional methods enhance robustness at the cost of area/energy by using larger cell sizes to improve the thermal stability of the MTJ cells. This paper employs multibit error correction with DRAM to the read operation) through TX. A key attribute of an MTJ is the notion of thermal stability. Fig. 2
Error Minimization Methods in Biproportional Apportionment Federica Ricca Andrea Scozzari
Serafini, Paolo
as an alternative to the classical axiomatic approach introduced by Balinski and Demange in 1989. We provide and in the statistical literature. A milestone theoretical setting was given by Balinski and Demange in 1989 [5, 6 a class of methods for Biproportional Apportionment characterized by an "error minimization" approach
DISCRIMINATION AND CLASSIFICATION OF UXO USING MAGNETOMETRY: INVERSION AND ERROR
Sambridge, Malcolm
DISCRIMINATION AND CLASSIFICATION OF UXO USING MAGNETOMETRY: INVERSION AND ERROR ANALYSIS USING for the different solutions didn't even overlap. Introduction A discrimination and classification strategy ambiguity and possible remanent magnetization the recovered dipole moment is compared to a library
Flexible Error Protection for Energy Efficient Reliable Architectures Timothy Miller
Xuan, Dong
Flexible Error Protection for Energy Efficient Reliable Architectures Timothy Miller , Nagarjuna and Computer Engineering The Ohio State University {millerti,teodores}@cse.ohio-state.edu, nagarjun. To deal with these com- peting trends, energy-efficient solutions are needed to deal with reli- ability
Designing Automation to Reduce Operator Errors Nancy G. Leveson
Leveson, Nancy
Designing Automation to Reduce Operator Errors Nancy G. Leveson Computer Science and Engineering University of Washington Everett Palmer NASA Ames Research Center Introduction Advanced automation has been of moderelated problems [SW95]. After studying accidents and incidents in the new, highly automated
Data aware, Low cost Error correction for Wireless Sensor Networks
California at San Diego, University of
Data aware, Low cost Error correction for Wireless Sensor Networks Shoubhik Mukhopadhyay, Debashis challenges in adoption and deployment of wireless networked sensing applications is ensuring reliable sensor of such applications. A wireless sensor network is inherently vulnerable to different sources of unreliability
Measured Quantum Fourier Transform of 1024 Qubits on Fiber Optics
Akihisa Tomita; Kazuo Nakamura
2004-01-19T23:59:59.000Z
Quantum Fourier transform (QFT) is a key function to realize quantum computers. A QFT followed by measurement was demonstrated on a simple circuit based on fiber-optics. The QFT was shown to be robust against imperfections in the rotation gate. Error probability was estimated to be 0.01 per qubit, which corresponded to error-free operation on 100 qubits. The error probability can be further reduced by taking the majority of the accumulated results. The reduction of error probability resulted in a successful QFT demonstration on 1024 qubits.
Tracking granules at the Sun's surface and reconstructing velocity fields. II. Error analysis
R. Tkaczuk; M. Rieutord; N. Meunier; T. Roudier
2007-07-13T23:59:59.000Z
The determination of horizontal velocity fields at the solar surface is crucial to understanding the dynamics and magnetism of the convection zone of the sun. These measurements can be done by tracking granules. Tracking granules from ground-based observations, however, suffers from the Earth's atmospheric turbulence, which induces image distortion. The focus of this paper is to evaluate the influence of this noise on the maps of velocity fields. We use the coherent structure tracking algorithm developed recently and apply it to two independent series of images that contain the same solar signal. We first show that a k-\\omega filtering of the times series of images is highly recommended as a pre-processing to decrease the noise, while, in contrast, using destretching should be avoided. We also demonstrate that the lifetime of granules has a strong influence on the error bars of velocities and that a threshold on the lifetime should be imposed to minimize errors. Finally, although solar flow patterns are easily recognizable and image quality is very good, it turns out that a time sampling of two images every 21 s is not frequent enough, since image distortion still pollutes velocity fields at a 30% level on the 2500 km scale, i.e. the scale on which granules start to behave like passive scalars. The coherent structure tracking algorithm is a useful tool for noise control on the measurement of surface horizontal solar velocity fields when at least two independent series are available.
BEAM RELATED SYSTEMATICS IN HIGGS BOSON MASS MEASUREMENT
BEAM RELATED SYSTEMATICS IN HIGGS BOSON MASS MEASUREMENT A.RASPEREZA DESY, Notkestrasse 85, DÂ22607#erential luminosity spectrum measurements and beam energy spread on the precision of the Higgs boson mass measurement possible impact of the beam related systematic errors on the Higgs boson mass measurement is discussed
Measurements of Faint Supernovae
Robert A. Schommer; N. B. Suntzeff; R. C. Smith
1999-09-04T23:59:59.000Z
We summarize the current status of cosmological measurements using SNe Ia. Searches to an average depth of z~0.5 have found approximately 100 SNe Ia to date, and measurements of their light curves and peak magnitudes find these objects to be about 0.25mag fainter than predictions for an empty universe. These measurements imply low values for Omega_M and a positive cosmological constant, with high statistical significance. Searches out to z~1.0-1.2 for SNe Ia (peak magnitudes of I~24.5) will greatly aid in confirming this result, or demonstrate the existence of systematic errors. Multi-epoch spectra of SNe Ia at z~0.5 are needed to constrain possible evolutionary effects. I band searches should be able to find SNe Ia out to z~2. We discuss some simulations of deep searches and discovery statistics at several redshifts.
Effects of Spectral Error in Efficiency Measurements of GaInAs-Based Concentrator Solar Cells
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article)41clothThe Bonneville Power AdministrationHawaii Electricity Profile 2013callYear 1Edwin M. McMillanEmissions (Conference)
Automated suppression of errors in LTP-II slope measurements with x-ray optics
Ali, Zulfiqar
2012-01-01T23:59:59.000Z
Helmholtz Zentrum Berlin (HZB)/BESSY-II (Germany) 4-7 and atan approach used with the HBZ/BESSY-II NOM instrument. 50 4.
Buser, Michael Dean
2004-09-30T23:59:59.000Z
Agricultural operations across the United States are encountering difficulties complying with current air pollution regulations for particulate matter (PM). PM is currently regulated in terms of particle diameters less ...
Estimation of the linear-plateau segmented regression model in the presence of measurement error
Grimshaw, Scott D.
1985-01-01T23:59:59.000Z
/c?) 4(~/o ) I (2-6) where 4(') is the standard normal density. Hence, letting = /m(YW)/o?, (2. 5) can be written as V [1 f fx(t) (( ) dz dt + f? j fx(t) 4( ) dz dt] m As the number of repeated observations is increased, 1im P [misclassif ication...] = / [lim C'(v )] f (t) dt + P [lim m(-v ) ] f (t) dt m x m x m~ by Lease B. l, = 0, since lim @(v ) = @(- ) for t & Y , m lim @(-v ) = @(~) for t & Y m Therefore, in the limit, the probability of misclassification is zero. When the join point, Y...
Automated suppression of errors in LTP-II slope measurements with x-ray optics
Ali, Zulfiqar
2012-01-01T23:59:59.000Z
precise reflective X-ray optics,” Nucl. Instrum. and Methods70 (2001). [2] P. Z. Takacs, “X- ray optics metrology,” in [Handbook of Optics], 3rd ed. , Vol. V, M. Bass, Ed. ,
Ultrasonic thickness measurements on corroded steel members: a statistical analysis of error
Konen, Keith Forman
1999-01-01T23:59:59.000Z
of the Journal of Structural Engineering, ASCE. This study is the first phase of a joint industry project (JIP) that is funded by the Mineral Management Service of the Department of the Interior, Shell Deepwater Development, Inc. , and Mobil Technology Company... to the numbering system used in the 1989 JIP. Note that not all members were used in this particular study. TABLE 5. 1. Description of specimens Member 10 15 16 Diameter (in) 12. 75 12. 50 12. 75 20. 00 16. 00 14. 00 14. 00 Wall Thickness (in) 0...
Error analysis of pose measurement from sonic sensors without using speed of sound information
Lai, Chih-Chien
1999-01-01T23:59:59.000Z
of using acoustic sensors to locate an object, are reviewed in this thesis. Moreover, some discussion on how to improve the algorithm's accuracy is also mentioned in this thesis. This work will attempt to improve the accuracy of using acoustic sensors...
NOx Measurement Errors in Ammonia-Containing Exhaust | Department of Energy
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasma | Department ofEnergy 9 Lehman final| Department of EnergyforNORTHEAST
Measurement to Error Stability: a Notion of Partial Detectability for Nonlinear Systems
Sontag, Eduardo
- research completed while the author was at Rutgers University, supported in part by US Air Force Grant F49620-98-1-0242 Supported in part by US Air Force Grant F49620-01- 1-0063 Supported in part by NSF Grant properly de- scribed as zero-detectability). The paper [23] contains a discussion of various definitions
Estimation of the linear-plateau segmented regression model in the presence of measurement error
Grimshaw, Scott D.
1985-01-01T23:59:59.000Z
u continuous density f , with E(x. ) & , ei - N(0, c ), and x i ' i e with x, , e. , u. . independent. 1 1 13 Y = [ Yl Y2 Y ]' (3. 2) 12 Zl Z2 Z a0 al ]' [ el e2 en] ' [ w) w2 wn' Z. =X. 1 1. if X &Y (3. 3) and if X. ) Y , i=if /n 1 m 3...-Y) III( ) ) ~m ? [E(w. . )] 2 i3 (iv) E(w, . ) = 3a P(X, ( y) 4 4 13 U 1 ~ + J (t-v) ~( ) f (t) ? Y m x + f (t-v) o(-v ) ?? + ? f (t-Y) 4(& ) f?(t) dt ~m f? (t-Y) 4( ) t?(t) dt ?m + 6~ f (t-v) @(? ) t (t) dt U Y m x + 3(2m-1)( ) f (t-v) 4...
Conjoint Degradation Model of Disablement for Survival and Longitudinal Data Measured with Errors
SPb. Math. Society Preprint 200302 30 Jul 2003 Conjoint Degradation Model of Disablement the semiparametric analysis of several new degradation and failure time regression models without and with time be applied in studies of longevity, aging and degradation in survival analysis, biostatistics, epidemiology
Assessing the capabilities of patternshop measurement systems
Peters, F.E.; Voigt, R.C.
1995-12-01T23:59:59.000Z
Casting customers continue to demand tighter dimensional tolerances for casting features. The foundry then places demands on the patternshop to produce more accurate patterns. Control of all sources of dimensional variability, including measurement system variability in the foundry and patternshop, is important to insure casting accuracy. Sources of dimensional casting errors will be reviewed, focusing on the importance of accurate patterns. The foundry and patternshop together must work within the tolerance limits established by the customer. In light of contemporary pattern tolerances, the patternshop must review its current measurement methods. The measurement instrument must have sufficient resolution to detect part variability. In addition, the measurement equipment must be used consistently by all patternmakers to insure adequacy of the measurement system. Without these precautions, measurement error can significantly contribute to overall pattern variability. Simple robust methods to check the adequacy of pattern measurement systems are presented. These tests will determine the variability that is contributed by the measurement equipment and by the operators. Steps to control measurement variability once it has been identified are also provided. Measurement system errors for various types of measurement equipment are compared to the allowable pattern tolerances, that are established together by the foundry and patternshop.
On the Fourier Transform Approach to Quantum Error Control
Hari Dilip Kumar
2012-08-24T23:59:59.000Z
Quantum codes are subspaces of the state space of a quantum system that are used to protect quantum information. Some common classes of quantum codes are stabilizer (or additive) codes, non-stabilizer (or non-additive) codes obtained from stabilizer codes, and Clifford codes. These are analyzed in a framework using the Fourier transform on finite groups, the finite group in question being a subgroup of the quantum error group considered. All the classes of codes that can be obtained in this framework are explored, including codes more general than Clifford codes. The error detection properties of one of these more general classes ("direct sums of translates of Clifford codes") are characterized. Examples codes are constructed, and computer code search results presented and analysed.
Method and system for reducing errors in vehicle weighing systems
Hively, Lee M. (Philadelphia, TN); Abercrombie, Robert K. (Knoxville, TN)
2010-08-24T23:59:59.000Z
A method and system (10, 23) for determining vehicle weight to a precision of <0.1%, uses a plurality of weight sensing elements (23), a computer (10) for reading in weighing data for a vehicle (25) and produces a dataset representing the total weight of a vehicle via programming (40-53) that is executable by the computer (10) for (a) providing a plurality of mode parameters that characterize each oscillatory mode in the data due to movement of the vehicle during weighing, (b) by determining the oscillatory mode at which there is a minimum error in the weighing data; (c) processing the weighing data to remove that dynamical oscillation from the weighing data; and (d) repeating steps (a)-(c) until the error in the set of weighing data is <0.1% in the vehicle weight.
MPI Runtime Error Detection with MUST: Advances in Deadlock Detection
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Hilbrich, Tobias; Protze, Joachim; Schulz, Martin; de Supinski, Bronis R.; Müller, Matthias S.
2013-01-01T23:59:59.000Z
The widely used Message Passing Interface (MPI) is complex and rich. As a result, application developers require automated tools to avoid and to detect MPI programming errors. We present the Marmot Umpire Scalable Tool (MUST) that detects such errors with significantly increased scalability. We present improvements to our graph-based deadlock detection approach for MPI, which cover future MPI extensions. Our enhancements also check complex MPI constructs that no previous graph-based detection approach handled correctly. Finally, we present optimizations for the processing of MPI operations that reduce runtime deadlock detection overheads. Existing approaches often require (p) analysis time per MPI operation,more »forpprocesses. We empirically observe that our improvements lead to sub-linear or better analysis time per operation for a wide range of real world applications.« less
Comparison of Wind Power and Load Forecasting Error Distributions: Preprint
Hodge, B. M.; Florita, A.; Orwig, K.; Lew, D.; Milligan, M.
2012-07-01T23:59:59.000Z
The introduction of large amounts of variable and uncertain power sources, such as wind power, into the electricity grid presents a number of challenges for system operations. One issue involves the uncertainty associated with scheduling power that wind will supply in future timeframes. However, this is not an entirely new challenge; load is also variable and uncertain, and is strongly influenced by weather patterns. In this work we make a comparison between the day-ahead forecasting errors encountered in wind power forecasting and load forecasting. The study examines the distribution of errors from operational forecasting systems in two different Independent System Operator (ISO) regions for both wind power and load forecasts at the day-ahead timeframe. The day-ahead timescale is critical in power system operations because it serves the unit commitment function for slow-starting conventional generators.
On the efficiency of nondegenerate quantum error correction codes for Pauli channels
Gunnar Bjork; Jonas Almlof; Isabel Sainz
2009-05-19T23:59:59.000Z
We examine the efficiency of pure, nondegenerate quantum-error correction-codes for Pauli channels. Specifically, we investigate if correction of multiple errors in a block is more efficient than using a code that only corrects one error per block. Block coding with multiple-error correction cannot increase the efficiency when the qubit error-probability is below a certain value and the code size fixed. More surprisingly, existing multiple-error correction codes with a code length equal or less than 256 qubits have lower efficiency than the optimal single-error correcting codes for any value of the qubit error-probability. We also investigate how efficient various proposed nondegenerate single-error correcting codes are compared to the limit set by the code redundancy and by the necessary conditions for hypothetically existing nondegenerate codes. We find that existing codes are close to optimal.
From the Lab to the real world : sources of error in UF {sub 6} gas enrichment monitoring
Lombardi, Marcie L.
2012-03-01T23:59:59.000Z
Safeguarding uranium enrichment facilities is a serious concern for the International Atomic Energy Agency (IAEA). Safeguards methods have changed over the years, most recently switching to an improved safeguards model that calls for new technologies to help keep up with the increasing size and complexity of today’s gas centrifuge enrichment plants (GCEPs). One of the primary goals of the IAEA is to detect the production of uranium at levels greater than those an enrichment facility may have declared. In order to accomplish this goal, new enrichment monitors need to be as accurate as possible. This dissertation will look at the Advanced Enrichment Monitor (AEM), a new enrichment monitor designed at Los Alamos National Laboratory. Specifically explored are various factors that could potentially contribute to errors in a final enrichment determination delivered by the AEM. There are many factors that can cause errors in the determination of uranium hexafluoride (UF{sub 6}) gas enrichment, especially during the period when the enrichment is being measured in an operating GCEP. To measure enrichment using the AEM, a passive 186-keV (kiloelectronvolt) measurement is used to determine the {sup 235}U content in the gas, and a transmission measurement or a gas pressure reading is used to determine the total uranium content. A transmission spectrum is generated using an x-ray tube and a “notch” filter. In this dissertation, changes that could occur in the detection efficiency and the transmission errors that could result from variations in pipe-wall thickness will be explored. Additional factors that could contribute to errors in enrichment measurement will also be examined, including changes in the gas pressure, ambient and UF{sub 6} temperature, instrumental errors, and the effects of uranium deposits on the inside of the pipe walls will be considered. The sensitivity of the enrichment calculation to these various parameters will then be evaluated. Previously, UF{sub 6} gas enrichment monitors have required empty pipe measurements to accurately determine the pipe attenuation (the pipe attenuation is typically much larger than the attenuation in the gas). This dissertation reports on a method for determining the thickness of a pipe in a GCEP when obtaining an empty pipe measurement may not be feasible. This dissertation studies each of the components that may add to the final error in the enrichment measurement, and the factors that were taken into account to mitigate these issues are also detailed and tested. The use of an x-ray generator as a transmission source and the attending stability issues are addressed. Both analytical calculations and experimental measurements have been used. For completeness, some real-world analysis results from the URENCO Capenhurst enrichment plant have been included, where the final enrichment error has remained well below 1% for approximately two months.
Scaling behavior of discretization errors in renormalization and improvement constants
Bhattacharya, T; Lee, W; Sharpe, S R; Bhattacharya, Tanmoy; Gupta, Rajan; Lee, Weonjong; Sharpe, Stephen R.
2006-01-01T23:59:59.000Z
Non-perturbative results for improvement and renormalization constants needed for on-shell and off-shell O(a) improvement of bilinear operators composed of Wilson fermions are presented. The calculations have been done in the quenched approximation at beta=6.0, 6.2 and 6.4. To quantify residual discretization errors we compare our data with results from other non-perturbative calculations and with one-loop perturbation theory.
Error message recording and reporting in the SLC control system
Spencer, N.; Bogart, J.; Phinney, N.; Thompson, K.
1985-04-01T23:59:59.000Z
Error or information messages that are signaled by control software either in the VAX host computer or the local microprocessor clusters are handled by a dedicated VAX process (PARANOIA). Messages are recorded on disk for further analysis and displayed at the appropriate console. Another VAX process (ERRLOG) can be used to sort, list and histogram various categories of messages. The functions performed by these processes and the algorithms used are discussed.
Runtime Detection of C-Style Errors in UPC Code
Pirkelbauer, P; Liao, C; Panas, T; Quinlan, D
2011-09-29T23:59:59.000Z
Unified Parallel C (UPC) extends the C programming language (ISO C 99) with explicit parallel programming support for the partitioned global address space (PGAS), which provides a global memory space with localized partitions to each thread. Like its ancestor C, UPC is a low-level language that emphasizes code efficiency over safety. The absence of dynamic (and static) safety checks allows programmer oversights and software flaws that can be hard to spot. In this paper, we present an extension of a dynamic analysis tool, ROSE-Code Instrumentation and Runtime Monitor (ROSECIRM), for UPC to help programmers find C-style errors involving the global address space. Built on top of the ROSE source-to-source compiler infrastructure, the tool instruments source files with code that monitors operations and keeps track of changes to the system state. The resulting code is linked to a runtime monitor that observes the program execution and finds software defects. We describe the extensions to ROSE-CIRM that were necessary to support UPC. We discuss complications that arise from parallel code and our solutions. We test ROSE-CIRM against a runtime error detection test suite, and present performance results obtained from running error-free codes. ROSE-CIRM is released as part of the ROSE compiler under a BSD-style open source license.
-- Auto Tuning; Measurement Weights; Power System State Estimation; Random Error Variances. I is not always true. M is used for estimating measurement e1 Abstract--This paper describes an approach for choosing and updating measurement weights used
California at Santa Barbara, University of
error of 19o . The effects of bearing errors on total velocity vector estimates were evaluated usingEvaluating radial component current measurements from CODAR high frequency radars and moored of the moorings carried vector measuring current meters (VMCM's), the ninth an upward-looking acoustic Doppler
Absolute beam emittance measurements at RHIC using ionization profile monitors
Minty, M. [Brookhaven National Lab. (BNL), Upton, NY (United States). Collider-Accelerator Dept.; Connolly, R [Brookhaven National Lab. (BNL), Upton, NY (United States). Collider-Accelerator Dept.; Liu, C. [Brookhaven National Lab. (BNL), Upton, NY (United States). Collider-Accelerator Dept.; Summers, T. [Brookhaven National Lab. (BNL), Upton, NY (United States). Collider-Accelerator Dept.; Tepikian, S. [Brookhaven National Lab. (BNL), Upton, NY (United States). Collider-Accelerator Dept.
2014-08-15T23:59:59.000Z
In the past, comparisons between emittance measurements obtained using ionization profile monitors, Vernier scans (using as input the measured rates from the zero degree counters, or ZDCs), the polarimeters and the Schottky detectors evidenced significant variations of up to 100%. In this report we present studies of the RHIC ionization profile monitors (IPMs). After identifying and correcting for two systematic instrumental errors in the beam size measurements, we present experimental results showing that the remaining dominant error in beam emittance measurements at RHIC using the IPMs was imprecise knowledge of the local beta functions. After removal of the systematic errors and implementation of measured beta functions, precise emittance measurements result. Also, consistency between the emittances measured by the IPMs and those derived from the ZDCs was demonstrated.
Scattering effects at near-wall flow measurements using Doppler global velocimetry
Fischer, Andreas; Haufe, Daniel; Buettner, Lars; Czarske, Juergen
2011-07-20T23:59:59.000Z
Doppler global velocimetry (DGV) is considered to be a useful optical measurement tool for acquiring flow velocity fields. Often near-wall measurements are required, which is still challenging due to errors resulting from background scattering and multiple-particle scattering. Since the magnitudes of both errors are unknown so far, they are investigated by scattering simulations and experiments. Multiple-particle scattering mainly causes a stochastic error, which can be reduced by averaging. Contrary to this, background scattering results in a relative systematic error, which is directly proportional to the ratio of the background scattered light power to the total scattered light power. After applying a correction method and optimizing the measurement arrangement, a subsonic flat plate boundary layer was successfully measured achieving a minimum wall distance of 100 {mu}m with a maximum relative error of 6%. The investigations reveal the current capabilities and perspectives of DGV for near-wall measurements.
Regression analysis with longitudinal measurements
Ryu, Duchwan
2005-08-29T23:59:59.000Z
, in the cardiotoxic effects of doxorubicin chemotherapy for the treat- ment of acute lymphoblastic leukemia in childhood (Lipsitz et al., 2002; Fitzmaurice et al., 2003), the design points are not pre-defined but determined by the preceding response. This outcome...-dependent feature of measurements makes biased estimation of regression line. As noticed by Lipsitz et al. (2002); Fitzmaurice et al. (2003), even the least square estimates will be biased, which does not require the distributional assumption of response error...
Shota Kino; Taiki Nii; Holger F. Hofmann
2015-08-13T23:59:59.000Z
Joint measurements of non-commuting observables are characterized by unavoidable measurement uncertainties that can be described in terms of the error statistics for input states with well-defined values for the target observables. However, a complete characterization of measurement errors must include the correlations between the errors of the two observables. Here, we show that these correlations appear in the experimentally observable measurement statistics obtained by performing the joint measurement on maximally entangled pairs. For two-level systems, the results indicate that quantum theory requires imaginary correlations between the measurement errors of X and Y since these correlations are represented by the operator product XY=iZ in the measurement operators. Our analysis thus reveals a directly observable consequence of non-commutativity in the statistics of quantum measurements.
Annual Logging Symposium, May 14-18, 2011 RAPID MODELING OF LWD NUCLEAR MEASUREMENTS ACQUIRED
Torres-Verdín, Carlos
Reliable interpretation of nuclear logging-while-drilling (LWD) measurements acquired in thinly depth of investigation (EDOI), which introduces errors in the inference of formation dip. Conventional properties. INTRODUCTION Logging-while-drilling measurements and their interpretation are rapidly becoming
V-109: Google Chrome WebKit Type Confusion Error Lets Remote...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
9: Google Chrome WebKit Type Confusion Error Lets Remote Users Execute Arbitrary Code V-109: Google Chrome WebKit Type Confusion Error Lets Remote Users Execute Arbitrary Code...
T-545: RealPlayer Heap Corruption Error in 'vidplin.dll' Lets...
T-545: RealPlayer Heap Corruption Error in 'vidplin.dll' Lets Remote Users Execute Arbitrary Code T-545: RealPlayer Heap Corruption Error in 'vidplin.dll' Lets Remote Users Execute...
Recompile if your codes run into MPICH error after the maintenance...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Recompile if your codes run into MPICH errors after the maintenance on 6252014 Recompile if your codes run into MPICH error after the maintenance on 6252014 June 27, 2014 (0...
Design techniques for graph-based error-correcting codes and their applications
Lan, Ching Fu
2006-04-12T23:59:59.000Z
-correcting (channel) coding. The main idea of error-correcting codes is to add redundancy to the information to be transmitted so that the receiver can explore the correlation between transmitted information and redundancy and correct or detect errors caused...
Simulations of error in quantum adiabatic computations of random 2-SAT instances
Gill, Jay S. (Jay Singh)
2006-01-01T23:59:59.000Z
This thesis presents a series of simulations of quantum computations using the adiabatic algorithm. The goal is to explore the effect of error, using a perturbative approach that models 1-local errors to the Hamiltonian ...
Gardner, Christopher
2008-01-01T23:59:59.000Z
A statistical description and model of individual healthcare expenditures in the US has been developed for measuring value in healthcare. We find evidence that healthcare expenditures are quantifiable as an infusion-diffusion process, which can be thought of intuitively as a steady change in the intensity of treatment superimposed on a random process reflecting variations in the efficiency and effectiveness of treatment. The arithmetic mean represents the net average annual cost of healthcare; and when multiplied by the arithmetic standard deviation, which represents the effective risk, the result is a measure of healthcare cost control. Policymakers, providers, payors, or patients that decrease these parameters are generating value in healthcare. The model has an average absolute prediction error of approximately 10-12% across the range of expenditures which spans 6 orders of magnitude over a nearly 10-year period. For the top 1% of the population with the largest expenditures, representing 20%-30% of total ...
Shared dosimetry error in epidemiological dose-response analyses
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Stram, Daniel O.; Preston, Dale L.; Sokolnikov, Mikhail; Napier, Bruce; Kopecky, Kenneth J.; Boice, John; Beck, Harold; Till, John; Bouville, Andre; Zeeb, Hajo
2015-03-23T23:59:59.000Z
Radiation dose reconstruction systems for large-scale epidemiological studies are sophisticated both in providing estimates of dose and in representing dosimetry uncertainty. For example, a computer program was used by the Hanford Thyroid Disease Study to provide 100 realizations of possible dose to study participants. The variation in realizations reflected the range of possible dose for each cohort member consistent with the data on dose determinates in the cohort. Another example is the Mayak Worker Dosimetry System 2013 which estimates both external and internal exposures and provides multiple realizations of "possible" dose history to workers given dose determinants. This paper takesmore »up the problem of dealing with complex dosimetry systems that provide multiple realizations of dose in an epidemiologic analysis. In this paper we derive expected scores and the information matrix for a model used widely in radiation epidemiology, namely the linear excess relative risk (ERR) model that allows for a linear dose response (risk in relation to radiation) and distinguishes between modifiers of background rates and of the excess risk due to exposure. We show that treating the mean dose for each individual (calculated by averaging over the realizations) as if it was true dose (ignoring both shared and unshared dosimetry errors) gives asymptotically unbiased estimates (i.e. the score has expectation zero) and valid tests of the null hypothesis that the ERR slope ? is zero. Although the score is unbiased the information matrix (and hence the standard errors of the estimate of ?) is biased for ??0 when ignoring errors in dose estimates, and we show how to adjust the information matrix to remove this bias, using the multiple realizations of dose. The use of these methods in the context of several studies including, the Mayak Worker Cohort, and the U.S. Atomic Veterans Study, is discussed.« less
T-719:Apache mod_proxy_ajp HTTP Processing Error Lets Remote Users Deny Service
Broader source: Energy.gov [DOE]
A remote user can cause the backend server to remain in an error state until the retry timeout expires.
McReynolds, W.L. (Bonneville Power Administration, Vancouver, WA (US)); Badley, D.E. (N.W. Power Pool, Coordinating Office, Portland, OR (US))
1991-08-01T23:59:59.000Z
This paper describes an automatic generation control (AGC) system that simultaneously reduces time error and accumulated inadvertent interchange energy in interconnected power system. This method is automatic time error and accumulated inadvertent interchange reduction (AIIR). With this method control areas help correct the system time error when doing so also tends to correct accumulated inadvertent interchange. Thus in one step accumulated inadvertent interchange and system time error are corrected.
Optimum decoding of TCM in the presence of phase errors
Han, Jae Choong
1990-01-01T23:59:59.000Z
discussed. Our approach is to assume that intersymbol interference has been effectively removed by the equalizer while the phase tracking scheme has partially removed the phase jitter, in which case the output of the equalizer will have a slowly varying.... The DAL [I] used the decision at the output ol' the Viterbi decoder to demodulate the local c&arrier. The performance degradation of coded 8-PSK when disturbed by recovered carrier phase error and jitter is investigatecl in i'Gi, in which simulation...
Effects of color coding on keying time and errors
Wooldridge, Brenda Gail
1983-01-01T23:59:59.000Z
were to determine the effects if any oi' color coding upon the error rate and location time of special func- tion keys on a computer keyboard. An ACT-YA CRT keyboard interfaced with a Kromemco microcomputer was used. There were 84 high schoool... to comnunicate with more and more computer-like devices. The most common computer/human interface is the terminal, consisting of a display screen, and keyboard. The format and layout on the display screen of computer-generated information is generally...
Error-field penetration in reversed magnetic shear configurations
Wang, H. H.; Wang, Z. X.; Wang, X. Q. [MOE Key Laboratory of Materials Modification by Beams of the Ministry of Education, School of Physics and Optoelectronic Engineering, Dalian University of Technology, Dalian 116024 (China)] [MOE Key Laboratory of Materials Modification by Beams of the Ministry of Education, School of Physics and Optoelectronic Engineering, Dalian University of Technology, Dalian 116024 (China); Wang, X. G. [School of Physics, Peking University, Beijing 100871 (China)] [School of Physics, Peking University, Beijing 100871 (China)
2013-06-15T23:59:59.000Z
Error-field penetration in reversed magnetic shear (RMS) configurations is numerically investigated by using a two-dimensional resistive magnetohydrodynamic model in slab geometry. To explore different dynamic processes in locked modes, three equilibrium states are adopted. Stable, marginal, and unstable current profiles for double tearing modes are designed by varying the current intensity between two resonant surfaces separated by a certain distance. Further, the dynamic characteristics of locked modes in the three RMS states are identified, and the relevant physics mechanisms are elucidated. The scaling behavior of critical perturbation value with initial plasma velocity is numerically obtained, which obeys previously established relevant analytical theory in the viscoresistive regime.
Trade-off of lossless source coding error exponents Cheng Chang Anant Sahai
Sahai, Anant
Trade-off of lossless source coding error exponents Cheng Chang Anant Sahai HP Labs, Palo Alto EECS, UC Berkeley ISIT 2008 Chang (HP Labs), Sahai ( UC Berkeley) Error Exponents trade-off ISIT 2008 1 (HP Labs), Sahai ( UC Berkeley) Error Exponents trade-off ISIT 2008 2 / 14 #12;Stabilizing an unstable
Matt Duckham Page 1 Implementing an object-oriented error sensitive GIS
Duckham, Matt
Matt Duckham Page 1 Implementing an object-oriented error sensitive GIS Matt Duckham Department in the handling of uncertainty within GIS, the production of what has been described as an error sensitive GIS of opportunities, but also impediments to the implemen- tation of such an error sensitive GIS. An important barrier
Digication Error Message:"Your username is already in use by another account."
Barrash, Warren
Digication Error Message:"Your username is already in use by another account." You may need you have one). If you receive the error message below, here's how to log into your Digication account. (For example, if the error message appeared when using your employee account, switch to your employee
Edit: Study -APP Save | Exit | Hide/Show Errors | Print... | Jump To
Biederman, Irving
Edit: Study - APP Save | Exit | Hide/Show Errors | Print... | Jump To: 01. Project Guidance Save | Exit | Hide/Show Errors | Print... | Jump To: 01. Project IdentificationStarDev/ResourceAdministration/Project/ProjectEditor?Project=com... 1 #12;Edit: Study - APP- Save | Exit | Hide/Show Errors | Print... | Jump To: 02. Study
Non-Concurrent Error Detection and Correction in Fault-Tolerant Discrete-Time LTI
Hadjicostis, Christoforos
Non-Concurrent Error Detection and Correction in Fault-Tolerant Discrete-Time LTI Dynamic Systems encoded form and allow error detection and correction to be performed through concurrent parity checks (i that allows parity checks to capture the evolution of errors in the system and, based on non-concurrent parity
Pollutant measurements Nils Mole, Finn Palmgren & Hao Zhang
Mole, Nils
we deal with measurement techniques and strategies appropriate to major pollutants in both air and water, and also with the effects of unavoidable measurement errors. Pollutant Measurements in Air The atmosphere is an important medium for trans- port and transformation of pollutants. Air pollutants can
Phasor Measurement Unit Data in Power System State Estimation
Phasor Measurement Unit Data in Power System State Estimation Intermediate Project Report Power Center since 1996 PSERC #12;Power Systems Engineering Research Center Phasor Measurement Unit Data deals with the placement of phasor measurement units (PMUs) based on the improvement in error
The robustness of magic state distillation against errors in Clifford gates
Jochym-O'Connor, Tomas; Helou, Bassam; Laflamme, Raymond
2012-01-01T23:59:59.000Z
Quantum error correction and fault-tolerance have provided the possibility for large scale quantum computations without a detrimental loss of quantum information. A very natural class of gates for fault-tolerant quantum computation is the Clifford gate set and as such their usefulness for universal quantum computation is of great interest. Clifford group gates augmented by magic state preparation give the possibility of simulating universal quantum computation. However, experimentally one cannot expect to perfectly prepare magic states. Nonetheless, it has been shown that by repeatedly applying operations from the Clifford group and measurements in the Pauli basis, the fidelity of noisy prepared magic states can be increased arbitrarily close to a pure magic state [1]. We investigate the robustness of magic state distillation to perturbations of the initial states to arbitrary locations in the Bloch sphere due to noise. Additionally, we consider a depolarizing noise model on the quantum gates in the decoding ...
QAM Adaptive Measurements Feedback Quantum Receiver Performance
Tian Chen; Ke Li; Yuan Zuo; Bing Zhu
2015-04-11T23:59:59.000Z
We theoretically study the quantum receivers with adaptive measurements feedback for discriminating quadrature amplitude modulation (QAM) coherent states in terms of average symbol error rate. For rectangular 16-QAM signal set, with different stages of adaptive measurements, the effects of realistic imperfection parameters including the sub-unity quantum efficiency and the dark counts of on-off detectors, as well as the transmittance of beam splitters and the mode mismatch factor between the signal and local oscillating fields on the symbol error rate are separately investigated through Monte Carlo simulations. Using photon-number-resolving detectors (PNRD) instead of on-off detectors, all the effects on the symbol error rate due to the above four imperfections can be suppressed in a certain degree. The finite resolution and PNR capability of PNRDs are also considered. We find that for currently available technology, the receiver shows a reasonable gain from the standard quantum limit (SQL) with moderate stages.
The sensitivity of patient specific IMRT QC to systematic MLC leaf bank offset errors
Rangel, Alejandra; Palte, Gesa; Dunscombe, Peter [Department of Medical Physics, Tom Baker Cancer Centre, 1331-29 Street NW, Calgary, Alberta T2N 4N2, Canada and Department of Physics and Astronomy, University of Calgary, 2500 University Drive North West, Calgary, Alberta T2N 1N4 (Canada); Department of Medical Physics, Tom Baker Cancer Centre, 1331-29 Street NW, Calgary, Alberta T2N 4N2 (Canada); Department of Medical Physics, Tom Baker Cancer Centre, 1331-29 Street NW, Calgary, Alberta T2N 4N2 (Canada); Department of Physics and Astronomy, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4 (Canada) and Department of Oncology, Tom Baker Cancer Centre, 1331-29 Street NW, Calgary, Alberta T2N 4N2 (Canada)
2010-07-15T23:59:59.000Z
Purpose: Patient specific IMRT QC is performed routinely in many clinics as a safeguard against errors and inaccuracies which may be introduced during the complex planning, data transfer, and delivery phases of this type of treatment. The purpose of this work is to evaluate the feasibility of detecting systematic errors in MLC leaf bank position with patient specific checks. Methods: 9 head and neck (H and N) and 14 prostate IMRT beams were delivered using MLC files containing systematic offsets ({+-}1 mm in two banks, {+-}0.5 mm in two banks, and 1 mm in one bank of leaves). The beams were measured using both MAPCHECK (Sun Nuclear Corp., Melbourne, FL) and the aS1000 electronic portal imaging device (Varian Medical Systems, Palo Alto, CA). Comparisons with calculated fields, without offsets, were made using commonly adopted criteria including absolute dose (AD) difference, relative dose difference, distance to agreement (DTA), and the gamma index. Results: The criteria most sensitive to systematic leaf bank offsets were the 3% AD, 3 mm DTA for MAPCHECK and the gamma index with 2% AD and 2 mm DTA for the EPID. The criterion based on the relative dose measurements was the least sensitive to MLC offsets. More highly modulated fields, i.e., H and N, showed greater changes in the percentage of passing points due to systematic MLC inaccuracy than prostate fields. Conclusions: None of the techniques or criteria tested is sufficiently sensitive, with the population of IMRT fields, to detect a systematic MLC offset at a clinically significant level on an individual field. Patient specific QC cannot, therefore, substitute for routine QC of the MLC itself.
New insights on numerical error in symplectic integration
Hugo Jiménez-Pérez; Jean-Pierre Vilotte; Barbara Romanowicz
2015-08-13T23:59:59.000Z
We implement and investigate the numerical properties of a new family of integrators connecting both variants of the symplectic Euler schemes, and including an alternative to the classical symplectic mid-point scheme, with some additional terms. This family is derived from a new method, introduced in a previous study, for generating symplectic integrators based on the concept of special symplectic manifold. The use of symplectic rotations and a particular type of projection keeps the whole procedure within the symplectic framework. We show that it is possible to define a set of parameters that control the additional terms providing a way of "tuning" these new symplectic schemes. We test the "tuned" symplectic integrators with the perturbed pendulum and we compare its behavior with an explicit scheme for perturbed systems. Remarkably, for the given examples, the error in the energy integral can be reduced considerably. There is a natural geometrical explanation, sketched at the end of this paper. This is the subject of a parallel article where a finer analysis is performed. Numerical results obtained in this paper open a new point of view on symplectic integrators and Hamiltonian error.
Aperiodic dynamical decoupling sequences in presence of pulse errors
Zhi-Hui Wang; V. V. Dobrovitski
2011-01-12T23:59:59.000Z
Dynamical decoupling (DD) is a promising tool for preserving the quantum states of qubits. However, small imperfections in the control pulses can seriously affect the fidelity of decoupling, and qualitatively change the evolution of the controlled system at long times. Using both analytical and numerical tools, we theoretically investigate the effect of the pulse errors accumulation for two aperiodic DD sequences, the Uhrig's DD UDD) protocol [G. S. Uhrig, Phys. Rev. Lett. {\\bf 98}, 100504 (2007)], and the Quadratic DD (QDD) protocol [J. R. West, B. H. Fong and D. A. Lidar, Phys. Rev. Lett {\\bf 104}, 130501 (2010)]. We consider the implementation of these sequences using the electron spins of phosphorus donors in silicon, where DD sequences are applied to suppress dephasing of the donor spins. The dependence of the decoupling fidelity on different initial states of the spins is the focus of our study. We investigate in detail the initial drop in the DD fidelity, and its long-term saturation. We also demonstrate that by applying the control pulses along different directions, the performance of QDD protocols can be noticeably improved, and explain the reason of such an improvement. Our results can be useful for future implementations of the aperiodic decoupling protocols, and for better understanding of the impact of errors on quantum control of spins.
Measurement uncertainty analysis techniques applied to PV performance measurements
Wells, C.
1992-10-01T23:59:59.000Z
The purpose of this presentation is to provide a brief introduction to measurement uncertainty analysis, outline how it is done, and illustrate uncertainty analysis with examples drawn from the PV field, with particular emphasis toward its use in PV performance measurements. The uncertainty information we know and state concerning a PV performance measurement or a module test result determines, to a significant extent, the value and quality of that result. What is measurement uncertainty analysis It is an outgrowth of what has commonly been called error analysis. But uncertainty analysis, a more recent development, gives greater insight into measurement processes and tests, experiments, or calibration results. Uncertainty analysis gives us an estimate of the I interval about a measured value or an experiment's final result within which we believe the true value of that quantity will lie. Why should we take the time to perform an uncertainty analysis A rigorous measurement uncertainty analysis: Increases the credibility and value of research results; allows comparisons of results from different labs; helps improve experiment design and identifies where changes are needed to achieve stated objectives (through use of the pre-test analysis); plays a significant role in validating measurements and experimental results, and in demonstrating (through the post-test analysis) that valid data have been acquired; reduces the risk of making erroneous decisions; demonstrates quality assurance and quality control measures have been accomplished; define Valid Data as data having known and documented paths of: Origin, including theory; measurements; traceability to measurement standards; computations; uncertainty analysis of results.
Global tropospheric ozone modeling: Quantifying errors due to grid resolution
Wild, Oliver; Prather, Michael J
2006-01-01T23:59:59.000Z
TRACE-P measurements representative of the western Pacificconverge on a value representative of the region. 4 of 14
Fossen, Haakon
Errors, 3rd printing ·Page 3, Fig 1.2 has an error in the stratigraphic key: "Tertiary" should "-amplitude" to "-wavelength". ·Page 231, 6th and 3rd last lines of the page: Add "Figure" in front of 19.5a ..." and 3rd line: "three principal axes" (not two). #12;
Coordinated joint motion control system with position error correction
Danko, George (Reno, NV)
2011-11-22T23:59:59.000Z
Disclosed are an articulated hydraulic machine supporting, control system and control method for same. The articulated hydraulic machine has an end effector for performing useful work. The control system is capable of controlling the end effector for automated movement along a preselected trajectory. The control system has a position error correction system to correct discrepancies between an actual end effector trajectory and a desired end effector trajectory. The correction system can employ one or more absolute position signals provided by one or more acceleration sensors supported by one or more movable machine elements. Good trajectory positioning and repeatability can be obtained. A two-joystick controller system is enabled, which can in some cases facilitate the operator's task and enhance their work quality and productivity.
Statistical Error analysis of Nucleon-Nucleon phenomenological potentials
R. Navarro Perez; J. E. Amaro; E. Ruiz Arriola
2014-06-10T23:59:59.000Z
Nucleon-Nucleon potentials are commonplace in nuclear physics and are determined from a finite number of experimental data with limited precision sampling the scattering process. We study the statistical assumptions implicit in the standard least squares fitting procedure and apply, along with more conventional tests, a tail sensitive quantile-quantile test as a simple and confident tool to verify the normality of residuals. We show that the fulfilment of normality tests is linked to a judicious and consistent selection of a nucleon-nucleon database. These considerations prove crucial to a proper statistical error analysis and uncertainty propagation. We illustrate these issues by analyzing about 8000 proton-proton and neutron-proton scattering published data. This enables the construction of potentials meeting all statistical requirements necessary for statistical uncertainty estimates in nuclear structure calculations.
Statistical evaluation of design-error related accidents
Ott, K.O.; Marchaterre, J.F.
1980-01-01T23:59:59.000Z
In a recently published paper (Campbell and Ott, 1979), a general methodology was proposed for the statistical evaluation of design-error related accidents. The evaluation aims at an estimate of the combined residual frequency of yet unknown types of accidents lurking in a certain technological system. Here, the original methodology is extended, as to apply to a variety of systems that evolves during the development of large-scale technologies. A special categorization of incidents and accidents is introduced to define the events that should be jointly analyzed. The resulting formalism is applied to the development of the nuclear power reactor technology, considering serious accidents that involve in the accident-progression a particular design inadequacy.
Hinckley, C.M.
1994-01-01T23:59:59.000Z
The performance of Japanese products in the marketplace points to the dominant role of quality in product competition. Our focus is motivated by the tremendous pressure to improve conformance quality by reducing defects to previously unimaginable limits in the range of 1 to 10 parts per million. Toward this end, we have developed a new model of conformance quality that addresses each of the three principle defect sources: (1) Variation, (2) Human Error, and (3) Complexity. Although the role of variation in conformance quality is well documented, errors occur so infrequently that their significance is not well known. We have shown that statistical methods are not useful in characterizing and controlling errors, the most common source of defects. Excessive complexity is also a root source of defects, since it increases errors and variation defects. A missing link in the defining a global model has been the lack of a sound correlation between complexity and defects. We have used Design for Assembly (DFA) methods to quantify assembly complexity and have shown that assembly times can be described in terms of the Pareto distribution in a clear exception to the Central Limit Theorem. Within individual companies we have found defects to be highly correlated with DFA measures of complexity in broad studies covering tens of millions of assembly operations. Applying the global concepts, we predicted that Motorola`s Six Sigma method would only reduce defects by roughly a factor of two rather than orders of magnitude, a prediction confirmed by Motorola`s data. We have also shown that the potential defects rates of product concepts can be compared in the earliest stages of development. The global Conformance Quality Model has demonstrated that the best strategy for improvement depends upon the quality control strengths and weaknesses.
Ice thickness measurements by Raman scattering
Pershin, Sergey M; Klinkov, Vladimir K; Yulmetov, Renat N; Bunkin, Alexey F
2014-01-01T23:59:59.000Z
A compact Raman LIDAR system with a spectrograph was used for express ice thickness measurements. The difference between the Raman spectra of ice and liquid water is employed to locate the ice-water interface while elastic scattering was used for air-ice surface detection. This approach yields an error of only 2 mm for an 80-mm-thick ice sample, indicating that it is promising express noncontact thickness measurements technique in field experiments.
Heid, Matthias; Luetkenhaus, Norbert [Quantum Information Theory Group, Institut fuer theoretische Physik I and Max-Planck Research Group, Institute of Optics, Information and Photonics, Universitaet Erlangen-Nuernberg, Staudtstrasse 7/B2, 91058 Erlangen (Germany)
2006-05-15T23:59:59.000Z
We investigate the performance of a continuous-variable quantum key distribution scheme in a practical setting. More specifically, we take a nonideal error reconciliation procedure into account. The quantum channel connecting the two honest parties is assumed to be lossy but noiseless. Secret key rates are given for the case that the measurement outcomes are postselected or a reverse reconciliation scheme is applied. The reverse reconciliation scheme loses its initial advantage in the practical setting. If one combines postselection with reverse reconciliation, however, much of this advantage can be recovered.
GREAT3 results - I. Systematic errors in shear estimation and the impact of real galaxy morphology
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Mandelbaum, Rachel; Rowe, Barnaby; Armstrong, Robert; Bard, Deborah; Bertin, Emmanuel; Bosch, James; Boutigny, Dominique; Courbin, Frederic; Dawson, William A.; Donnarumma, Annamaria; et al
2015-05-11T23:59:59.000Z
The study present first results from the third GRavitational lEnsing Accuracy Testing (GREAT3) challenge, the third in a sequence of challenges for testing methods of inferring weak gravitational lensing shear distortions from simulated galaxy images. GREAT3 was divided into experiments to test three specific questions, and included simulated space- and ground-based data with constant or cosmologically varying shear fields. The simplest (control) experiment included parametric galaxies with a realistic distribution of signal-to-noise, size, and ellipticity, and a complex point spread function (PSF). The other experiments tested the additional impact of realistic galaxy morphology, multiple exposure imaging, and the uncertainty aboutmore »a spatially varying PSF; the last two questions will be explored in Paper II. The 24 participating teams competed to estimate lensing shears to within systematic error tolerances for upcoming Stage-IV dark energy surveys, making 1525 submissions overall. GREAT3 saw considerable variety and innovation in the types of methods applied. Several teams now meet or exceed the targets in many of the tests conducted (to within the statistical errors). We conclude that the presence of realistic galaxy morphology in simulations changes shear calibration biases by ~1 per cent for a wide range of methods. Other effects such as truncation biases due to finite galaxy postage stamps, and the impact of galaxy type as measured by the Sérsic index, are quantified for the first time. Our results generalize previous studies regarding sensitivities to galaxy size and signal-to-noise, and to PSF properties such as seeing and defocus. Almost all methods’ results support the simple model in which additive shear biases depend linearly on PSF ellipticity.« less
Microsoft PowerPoint - Reducing Solar Resource Error Through...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Degradation (0.5 - 1 %) Transposition To Plane of Array (0.5 - 2%) Energy Simulation & Plant Losses (3 - 5 %) Solar Resource Uncertainty (Measurement, IA Variability, POR,...
Determination of the star tracker-inertial measurement unit misalignment
Shearer, Milo Edward
1967-01-01T23:59:59.000Z
navigation system should have the following characteristics; l. The instrumentation is desi, ~cd to measure force through the mechanical implemontation of iiewtcn's second law of motion. 2. The system's accuracy is limited by the degree of perf... 36 navigation possible, since the inertial instrumented' otherwise, would. have aocuracy requirements that are (58) 36 Ibidem pe 453 ' 28 now unattainable. The two principal aces'3 eros etcr errors ere the bis. s error, S K? and tbe scale...
Contagious error sources would need time travel to prevent quantum computation
Gil Kalai; Greg Kuperberg
2015-05-07T23:59:59.000Z
We consider an error model for quantum computing that consists of "contagious quantum germs" that can infect every output qubit when at least one input qubit is infected. Once a germ actively causes error, it continues to cause error indefinitely for every qubit it infects, with arbitrary quantum entanglement and correlation. Although this error model looks much worse than quasi-independent error, we show that it reduces to quasi-independent error with the technique of quantum teleportation. The construction, which was previously described by Knill, is that every quantum circuit can be converted to a mixed circuit with bounded quantum depth. We also consider the restriction of bounded quantum depth from the point of view of quantum complexity classes.
Method and apparatus for detecting timing errors in a system oscillator
Gliebe, Ronald J. (Library, PA); Kramer, William R. (Bethel Park, PA)
1993-01-01T23:59:59.000Z
A method of detecting timing errors in a system oscillator for an electronic device, such as a power supply, includes the step of comparing a system oscillator signal with a delayed generated signal and generating a signal representative of the timing error when the system oscillator signal is not identical to the delayed signal. An LED indicates to an operator that a timing error has occurred. A hardware circuit implements the above-identified method.
Scher, Aaron David
2005-08-29T23:59:59.000Z
................................................................................ 7 3 ADS optimization screenshot.................................................................... 11 4 Maximum (a) Zin, (b) |S21 magnitude|, and (c) |S21 phase| error factors. Z 0 = 50 ? , L = 200 um, substrate thickness = 100 um..., and VSWR = 2.... 12 5 Maximum (a) Zin, (b) |S21 magnitude|, and (c) |S21 phase| error factors. Z0=25 ? , L = 200 um, substrate thickness = 100 um, and VSWR = 2. .... 13 6 Maximum Zin error factors for (a) L = 100 um and (b) L = 150 um...
Kaeli, David R.
A Field Analysis of System-level Effects of Soft Errors Occurring in Microprocessors used, will generate sufficient charge to cause a soft error. In the absence of error correction schemes, the system rates for unprotected systems [8]. Soft errors are emerging as a significant obstacle to increasing
Kaeli, David R.
A Field Failure Analysis of Microprocessors used in Information Systems Abstract Soft errors due from error logs and error traces of the microprocessors collected from systems in the field. Soft focus on soft error rate (SER) estimation of microprocessors used in information systems by analyzing
The Importance of Run-time Error Detection Glenn R. Luecke 1
Luecke, Glenn R.
Iowa State University's High Performance Computing Group, Iowa State University, Ames, Iowa 50011, USA State University's High Performance Computing Group for evaluating run-time error detection capabilities
Accounting for model error due to unresolved scales within ensemble Kalman filtering
Lewis Mitchell; Alberto Carrassi
2014-09-02T23:59:59.000Z
We propose a method to account for model error due to unresolved scales in the context of the ensemble transform Kalman filter (ETKF). The approach extends to this class of algorithms the deterministic model error formulation recently explored for variational schemes and extended Kalman filter. The model error statistic required in the analysis update is estimated using historical reanalysis increments and a suitable model error evolution law. Two different versions of the method are described; a time-constant model error treatment where the same model error statistical description is time-invariant, and a time-varying treatment where the assumed model error statistics is randomly sampled at each analysis step. We compare both methods with the standard method of dealing with model error through inflation and localization, and illustrate our results with numerical simulations on a low order nonlinear system exhibiting chaotic dynamics. The results show that the filter skill is significantly improved through the proposed model error treatments, and that both methods require far less parameter tuning than the standard approach. Furthermore, the proposed approach is simple to implement within a pre-existing ensemble based scheme. The general implications for the use of the proposed approach in the framework of square-root filters such as the ETKF are also discussed.
V-172: ISC BIND RUNTIME_CHECK Error Lets Remote Users Deny Service...
Broader source: Energy.gov (indexed) [DOE]
the target resolver to crash IMPACT: Triggering this defect will cause the affected server to exit with an error, denying service to recursive DNS clients that use that...
Ulidowski, Irek
Eccentricity Error Correction for Automated Estimation of Polyethylene Wear after Total Hip. Wire markers are typically attached to the polyethylene acetabular component of the prosthesis so
Choose and choose again: appearance-reality errors, pragmatics and logical ability
Deák, Gedeon O; Enright, Brian
2006-01-01T23:59:59.000Z
Development, 62, 753–766. Speer, J.R. (1984). Two practicalolder still make errors (e.g. Speer, 1984), some preschool
Choose and choose again: appearance-reality errors, pragmatics and logical ability.
Deák, Gedeon O; Enright, Brian
2006-01-01T23:59:59.000Z
Development, 62, 753-766. Speer, J. R. (1984). Two practicalolder still make errors (e.g. , Speer, 1984), some preschool
Implications of Monte Carlo Statistical Errors in Criticality Safety Assessments
Pevey, Ronald E.
2005-09-15T23:59:59.000Z
Most criticality safety calculations are performed using Monte Carlo techniques because of Monte Carlo's ability to handle complex three-dimensional geometries. For Monte Carlo calculations, the more histories sampled, the lower the standard deviation of the resulting estimates. The common intuition is, therefore, that the more histories, the better; as a result, analysts tend to run Monte Carlo analyses as long as possible (or at least to a minimum acceptable uncertainty). For Monte Carlo criticality safety analyses, however, the optimization situation is complicated by the fact that procedures usually require that an extra margin of safety be added because of the statistical uncertainty of the Monte Carlo calculations. This additional safety margin affects the impact of the choice of the calculational standard deviation, both on production and on safety. This paper shows that, under the assumptions of normally distributed benchmarking calculational errors and exact compliance with the upper subcritical limit (USL), the standard deviation that optimizes production is zero, but there is a non-zero value of the calculational standard deviation that minimizes the risk of inadvertently labeling a supercritical configuration as subcritical. Furthermore, this value is shown to be a simple function of the typical benchmarking step outcomes--the bias, the standard deviation of the bias, the upper subcritical limit, and the number of standard deviations added to calculated k-effectives before comparison to the USL.
Plasma dynamics and a significant error of macroscopic averaging
Marek A. Szalek
2005-05-22T23:59:59.000Z
The methods of macroscopic averaging used to derive the macroscopic Maxwell equations from electron theory are methodologically incorrect and lead in some cases to a substantial error. For instance, these methods do not take into account the existence of a macroscopic electromagnetic field EB, HB generated by carriers of electric charge moving in a thin layer adjacent to the boundary of the physical region containing these carriers. If this boundary is impenetrable for charged particles, then in its immediate vicinity all carriers are accelerated towards the inside of the region. The existence of the privileged direction of acceleration results in the generation of the macroscopic field EB, HB. The contributions to this field from individual accelerated particles are described with a sufficient accuracy by the Lienard-Wiechert formulas. In some cases the intensity of the field EB, HB is significant not only for deuteron plasma prepared for a controlled thermonuclear fusion reaction but also for electron plasma in conductors at room temperatures. The corrected procedures of macroscopic averaging will induce some changes in the present form of plasma dynamics equations. The modified equations will help to design improved systems of plasma confinement.
Error analysis of nuclear forces and effective interactions
R. Navarro Perez; J. E. Amaro; E. Ruiz Arriola
2014-09-04T23:59:59.000Z
The Nucleon-Nucleon interaction is the starting point for ab initio Nuclear Structure and Nuclear reactions calculations. Those are effectively carried out via effective interactions fitting scattering data up to a maximal center of mass momentum. However, NN interactions are subjected to statistical and systematic uncertainties which are expected to propagate and have some impact on the predictive power and accuracy of theoretical calculations, regardless on the numerical accuracy of the method used to solve the many body problem. We stress the necessary conditions required for a correct and self-consistent statistical interpretation of the discrepancies between theory and experiment which enable a subsequent statistical error propagation and correlation analysis. We comprehensively discuss an stringent and recently proposed tail-sensitive normality test and provide a simple recipe to implement it. As an application, we analyze the deduced uncertainties and correlations of effective interactions in terms of Moshinsky-Skyrme parameters and effective field theory counterterms as derived from the bare NN potential containing One-Pion-Exchange and Chiral Two-Pion-Exchange interactions inferred from scattering data.
Aperiodic dynamical decoupling sequences in presence of pulse errors
Wang, Zhi-Hui
2011-01-01T23:59:59.000Z
Dynamical decoupling (DD) is a promising tool for preserving the quantum states of qubits. However, small imperfections in the control pulses can seriously affect the fidelity of decoupling, and qualitatively change the evolution of the controlled system at long times. Using both analytical and numerical tools, we theoretically investigate the effect of the pulse errors accumulation for two aperiodic DD sequences, the Uhrig's DD UDD) protocol [G. S. Uhrig, Phys. Rev. Lett. {\\bf 98}, 100504 (2007)], and the Quadratic DD (QDD) protocol [J. R. West, B. H. Fong and D. A. Lidar, Phys. Rev. Lett {\\bf 104}, 130501 (2010)]. We consider the implementation of these sequences using the electron spins of phosphorus donors in silicon, where DD sequences are applied to suppress dephasing of the donor spins. The dependence of the decoupling fidelity on different initial states of the spins is the focus of our study. We investigate in detail the initial drop in the DD fidelity, and its long-term saturation. We also demonstra...
A Direct Measure of Entrainment DAVID M. ROMPS
Romps, David M.
A Direct Measure of Entrainment DAVID M. ROMPS Harvard University, Cambridge, Massachusetts for directly measuring convective entrainment and detrainment in a cloud- resolving simulation. This technique is used to quantify the errors in the entrainment and detrainment esti- mates obtained using the standard
Measuring the dark matter equation of state
Serra, Ana Laura
2011-01-01T23:59:59.000Z
The nature of the dominant component of galaxies and clusters remains unknown. While the astrophysics comunity supports the cold dark matter (CDM) paradigm as a clue factor in the current cosmological model, no direct CDM detections have been performed. Faber and Visser 2006 have suggested a simple method for measuring the dark matter equation of state. By combining kinematical and gravitational lensing data it is possible to test the widely adopted assumption of pressureless dark matter. According to this formalism, we have measured the dark matter equation of state for first time using improved techniques. We have found that the value of the equation of state parameter is consistent with pressureless dark matter within the errors. Nevertheless the measured value is lower than expected. This fact follows from the well known differences between the masses determinated by lensing and kinematical methods. We have tested our techniques using simulations and we have also analyzed possible sources of errors that c...
Mapping GPS positional errors with spatial linear mixed models
Militino, A. F.
Nowadays, GPS receivers are very reliable because of their good accuracy and precision; however, uncertainty is also inherent in geospatial data. Quality of GPS measurements can be influenced by atmospheric disturbances, ...
Adam Miranowicz; Sahin K. Ozdemir; Jiri Bajer; Go Yusa; Nobuyuki Imoto; Yoshiro Hirayama; Franco Nori
2014-10-09T23:59:59.000Z
We discuss methods of quantum state tomography for solid-state systems with a large nuclear spin $I=3/2$ in nanometer-scale semiconductors devices based on a quantum well. Due to quadrupolar interactions, the Zeeman levels of these nuclear-spin devices become nonequidistant, forming a controllable four-level quantum system (known as quartit or ququart). The occupation of these levels can be selectively and coherently manipulated by multiphoton transitions using the techniques of nuclear magnetic resonance (NMR) [Yusa et al., Nature (London) 434, 101 (2005)]. These methods are based on an unconventional approach to NMR, where the longitudinal magnetization $M_z$ is directly measured. This is in contrast to the standard NMR experiments and tomographic methods, where the transverse magnetization $M_{xy}$ is detected. The robustness against errors in the measured data is analyzed by using condition numbers. We propose several methods with optimized sets of rotations. The optimization is applied to decrease the number of NMR readouts and to improve the robustness against errors, as quantified by condition numbers. An example of state reconstruction, using Monte Carlo methods, is presented. Tomographic methods for quadrupolar nuclei with higher-spin numbers (including $I=7/2$) are also described.
Out-of-plane ultrasonic velocity measurement
Hall, M.S.; Brodeur, P.H.; Jackson, T.G.
1998-07-14T23:59:59.000Z
A method for improving the accuracy of measuring the velocity and time of flight of ultrasonic signals through moving web-like materials such as paper, paperboard and the like, includes a pair of ultrasonic transducers disposed on opposing sides of a moving web-like material. In order to provide acoustical coupling between the transducers and the web-like material, the transducers are disposed in fluid-filled wheels. Errors due to variances in the wheel thicknesses about their circumference which can affect time of flight measurements and ultimately the mechanical property being tested are compensated by averaging the ultrasonic signals for a predetermined number of revolutions. The invention further includes a method for compensating for errors resulting from the digitization of the ultrasonic signals. More particularly, the invention includes a method for eliminating errors known as trigger jitter inherent with digitizing oscilloscopes used to digitize the signals for manipulation by a digital computer. In particular, rather than cross-correlate ultrasonic signals taken during different sample periods as is known in the art in order to determine the time of flight of the ultrasonic signal through the moving web, a pulse echo box is provided to enable cross-correlation of predetermined transmitted ultrasonic signals with predetermined reflected ultrasonic or echo signals during the sample period. By cross-correlating ultrasonic signals in the same sample period, the error associated with trigger jitter is eliminated. 20 figs.
Out-of-plane ultrasonic velocity measurement
Hall, Maclin S. (Marietta, GA); Brodeur, Pierre H. (Smyrna, GA); Jackson, Theodore G. (Atlanta, GA)
1998-01-01T23:59:59.000Z
A method for improving the accuracy of measuring the velocity and time of flight of ultrasonic signals through moving web-like materials such as paper, paperboard and the like, includes a pair of ultrasonic transducers disposed on opposing sides of a moving web-like material. In order to provide acoustical coupling between the transducers and the web-like material, the transducers are disposed in fluid-filled wheels. Errors due to variances in the wheel thicknesses about their circumference which can affect time of flight measurements and ultimately the mechanical property being tested are compensated by averaging the ultrasonic signals for a predetermined number of revolutions. The invention further includes a method for compensating for errors resulting from the digitization of the ultrasonic signals. More particularly, the invention includes a method for eliminating errors known as trigger jitter inherent with digitizing oscilloscopes used to digitize the signals for manipulation by a digital computer. In particular, rather than cross-correlate ultrasonic signals taken during different sample periods as is known in the art in order to determine the time of flight of the ultrasonic signal through the moving web, a pulse echo box is provided to enable cross-correlation of predetermined transmitted ultrasonic signals with predetermined reflected ultrasonic or echo signals during the sample period. By cross-correlating ultrasonic signals in the same sample period, the error associated with trigger jitter is eliminated.
Nelms, Benjamin E. [Canis Lupus LLC, Merrimac, Wisconsin 53561 (United States)] [Canis Lupus LLC, Merrimac, Wisconsin 53561 (United States); Chan, Maria F. [Memorial Sloan-Kettering Cancer Center, Basking Ridge, New Jersey 07920 (United States)] [Memorial Sloan-Kettering Cancer Center, Basking Ridge, New Jersey 07920 (United States); Jarry, Geneviève; Lemire, Matthieu [Hôpital Maisonneuve-Rosemont, Montréal, QC H1T 2M4 (Canada)] [Hôpital Maisonneuve-Rosemont, Montréal, QC H1T 2M4 (Canada); Lowden, John [Indiana University Health - Goshen Hospital, Goshen, Indiana 46526 (United States)] [Indiana University Health - Goshen Hospital, Goshen, Indiana 46526 (United States); Hampton, Carnell [Levine Cancer Institute/Carolinas Medical Center, Concord, North Carolina 28025 (United States)] [Levine Cancer Institute/Carolinas Medical Center, Concord, North Carolina 28025 (United States); Feygelman, Vladimir [Moffitt Cancer Center, Tampa, Florida 33612 (United States)] [Moffitt Cancer Center, Tampa, Florida 33612 (United States)
2013-11-15T23:59:59.000Z
Purpose: This study (1) examines a variety of real-world cases where systematic errors were not detected by widely accepted methods for IMRT/VMAT dosimetric accuracy evaluation, and (2) drills-down to identify failure modes and their corresponding means for detection, diagnosis, and mitigation. The primary goal of detailing these case studies is to explore different, more sensitive methods and metrics that could be used more effectively for evaluating accuracy of dose algorithms, delivery systems, and QA devices.Methods: The authors present seven real-world case studies representing a variety of combinations of the treatment planning system (TPS), linac, delivery modality, and systematic error type. These case studies are typical to what might be used as part of an IMRT or VMAT commissioning test suite, varying in complexity. Each case study is analyzed according to TG-119 instructions for gamma passing rates and action levels for per-beam and/or composite plan dosimetric QA. Then, each case study is analyzed in-depth with advanced diagnostic methods (dose profile examination, EPID-based measurements, dose difference pattern analysis, 3D measurement-guided dose reconstruction, and dose grid inspection) and more sensitive metrics (2% local normalization/2 mm DTA and estimated DVH comparisons).Results: For these case studies, the conventional 3%/3 mm gamma passing rates exceeded 99% for IMRT per-beam analyses and ranged from 93.9% to 100% for composite plan dose analysis, well above the TG-119 action levels of 90% and 88%, respectively. However, all cases had systematic errors that were detected only by using advanced diagnostic techniques and more sensitive metrics. The systematic errors caused variable but noteworthy impact, including estimated target dose coverage loss of up to 5.5% and local dose deviations up to 31.5%. Types of errors included TPS model settings, algorithm limitations, and modeling and alignment of QA phantoms in the TPS. Most of the errors were correctable after detection and diagnosis, and the uncorrectable errors provided useful information about system limitations, which is another key element of system commissioning.Conclusions: Many forms of relevant systematic errors can go undetected when the currently prevalent metrics for IMRT/VMAT commissioning are used. If alternative methods and metrics are used instead of (or in addition to) the conventional metrics, these errors are more likely to be detected, and only once they are detected can they be properly diagnosed and rooted out of the system. Removing systematic errors should be a goal not only of commissioning by the end users but also product validation by the manufacturers. For any systematic errors that cannot be removed, detecting and quantifying them is important as it will help the physicist understand the limits of the system and work with the manufacturer on improvements. In summary, IMRT and VMAT commissioning, along with product validation, would benefit from the retirement of the 3%/3 mm passing rates as a primary metric of performance, and the adoption instead of tighter tolerances, more diligent diagnostics, and more thorough analysis.
IEEE SENSORS JOURNAL, VOL. 3, NO. 5, OCTOBER 2003 595 Active Structural Error Suppression in MEMS
Chen, Zhongping
-run perturbations are presented. Index Terms--Error suppression, microelectromechanical sys- tems (MEMS), rate integrating gyroscopes, smart MEMS. I. INTRODUCTION AS MICROELECTROMECHANICAL systems (MEMS) inertial sensorsIEEE SENSORS JOURNAL, VOL. 3, NO. 5, OCTOBER 2003 595 Active Structural Error Suppression in MEMS
A Case for Soft Error Detection and Correction in Computational Chemistry
van Dam, Hubertus JJ; Vishnu, Abhinav; De Jong, Wibe A.
2013-09-10T23:59:59.000Z
High performance computing platforms are expected to deliver 10(18) floating operations per second by the year 2022 through the deployment of millions of cores. Even if every core is highly reliable the sheer number of the them will mean that the mean time between failures will become so short that most applications runs will suffer at least one fault. In particular soft errors caused by intermittent incorrect behavior of the hardware are a concern as they lead to silent data corruption. In this paper we investigate the impact of soft errors on optimization algorithms using Hartree-Fock as a particular example. Optimization algorithms iteratively reduce the error in the initial guess to reach the intended solution. Therefore they may intuitively appear to be resilient to soft errors. Our results show that this is true for soft errors of small magnitudes but not for large errors. We suggest error detection and correction mechanisms for different classes of data structures. The results obtained with these mechanisms indicate that we can correct more than 95% of the soft errors at moderate increases in the computational cost.
Fessler, Jeffrey A.
-ray computed tomography. The effects of the quantization error in forward-projection, back computed tomography (CT) have been proposed to improve image quality and reduce dose [1]. These methodsPERTURBATION-BASED ERROR ANALYSIS OF ITERATIVE IMAGE RECONSTRUCTION ALGORITHM FOR X-RAY COMPUTED
Convergence Analysis of the LMS Algorithm with a General Error Nonlinearity and an IID Input
Al-Naffouri, Tareq Y.
Convergence Analysis of the LMS Algorithm with a General Error Nonlinearity and an IID Input Tareq. of Electrical Eng. Abstract The class of least mean square (LMS) algorithms employing a general error are entirely consis- tent with those of the LMS algorithm and several of its variants. The results also
Al-Naffouri, Tareq Y.
The Optimum Error Nonlinearity in LMS Adaptation with an Independent and Identically Distributed, CA 94305 Dhahran 31261 USA Saudi Arabia Abstract The class of LMS algorithms employing a gen- eral view of error nonlinearities in LMS adaptation. In particular, it subsumes two recently developed
Minimum Bit Error Probability of Large Randomly Spread MCCDMA Systems in
MÃ¼ller, Ralf R.
Minimum Bit Error Probability of Large Randomly Spread MCÂCDMA Systems in Multipath Rayleigh Fading, to calculate the bit error probaÂ bility in the large system limit for randomly assigned spreading sequences detecÂ tion with is accurate if the number of users and the spreading factor are large. His calculations
Minimum Bit Error Probability of Large Randomly Spread MC-CDMA Systems in
MÃ¼ller, Ralf R.
Minimum Bit Error Probability of Large Randomly Spread MC-CDMA Systems in Multipath Rayleigh Fading, to calculate the bit error proba- bility in the large system limit for randomly assigned spreading sequences detec- tion with is accurate if the number of users and the spreading factor are large. His calculations
Using system simulation to model the impact of human error in a maritime system
van Dorp, Johan René
the modeling of human error related accident event sequences in a risk assessment of maritime oil framwork was developed for the Prince William Sound Risk Assessment based on interviews with maritime William Sound; Human error; Maritime accidents; Expert judgement; Risk assessment; Risk management 1
TYPOGRAPHICAL AND ORTHOGRAPHICAL SPELLING ERROR Kyongho Min*, William H. Wilson*, Yoo-Jin Moon
Wilson, Bill
-Jin Moon *School of Computer Science and Engineering The University of New South Wales Sydney NSW 2052 of spelling errors such as typographical (Damerau, 1964; Pollock and Zamora, 1983), orthographical (Sterling), and orthographical errors in spontaneous writings of children (Sterling, 1983; Mitton, 1987). 1.2. Approaches
Approximate logic circuits for low overhead, non-intrusive concurrent error detection
Mohanram, Kartik
Approximate logic circuits for low overhead, non-intrusive concurrent error detection Mihir R for the synthesis of approximate logic circuits. A low overhead, non-intrusive solution for concurrent error as proposed in this paper. A low overhead, non-intrusive solution for CED based on ap- proximate
Drift-magnetohydrodynamical model of error-field penetration in tokamak plasmas
Fitzpatrick, Richard
Drift-magnetohydrodynamical model of error-field penetration in tokamak plasmas A. Cole and R published magnetohydrodynamical MHD model of error-field penetration in tokamak plasmas is extended to take in ohmic tokamak plasmas. © 2006 American Institute of Physics. DOI: 10.1063/1.2178167 I. INTRODUCTION
Observability-aware Directed Test Generation for Soft Errors and Crosstalk Faults
Mishra, Prabhat
. In modern System- on-Chip (SoC) design methodology, it is found that regions where errors are detectedObservability-aware Directed Test Generation for Soft Errors and Crosstalk Faults Kanad Basu Syst emerged as an important component of any chip design methodology to detect both functional and electrical
Presenting JECA: A Java Error Correcting Algorithm for the Java Intelligent Tutoring System
Franek, Frantisek
Presenting JECA: A Java Error Correcting Algorithm for the Java Intelligent Tutoring System Edward context involving small Java programs. Furthermore, this paper presents JECA (Java Error Correction is to provide a foundation for the Java Intelligent Tutoring System (JITS) currently being field-tested. Key
ERROR BOUNDS FOR MONOTONE APPROXIMATION SCHEMES FOR HAMILTON-JACOBI-BELLMAN
ERROR BOUNDS FOR MONOTONE APPROXIMATION SCHEMES FOR HAMILTON-JACOBI-BELLMAN EQUATIONS GUY BARLES AND ESPEN R. JAKOBSEN Abstract. We obtain error bounds for monotone approximation schemes of Hamilton-Jacobi, (almost) smooth supersolutions for the Hamilton-Jacobi-Bellman equation. 1. Introduction This paper
AN ADAPTIVE METHOD WITH RIGOROUS ERROR CONTROL FOR THE HAMILTON-JACOBI EQUATIONS.
AN ADAPTIVE METHOD WITH RIGOROUS ERROR CONTROL FOR THE HAMILTON-JACOBI EQUATIONS. PART II: THE TWO adaptive method with rigorous error control for the Hamilton-Jacobi equations. Part II: The two and study an adaptive method for finding approximations to the viscosity solution of Hamilton-Jacobi
Object calculus and the object-oriented analysis and design of an error-sensitive GIS
Duckham, Matt
Object calculus and the object-oriented analysis and design of an error-sensitive GIS MATT DUCKHAM of an error-sensitive GIS Abstract. The use of object-oriented analysis and design (OOAD) in GIS research of the key contemporary issues in GIS. This paper examines the application of one particular OO formalism
Static Detection of API Error-Handling Bugs via Mining Source Code
Young, R. Michael
Static Detection of API Error-Handling Bugs via Mining Source Code Mithun Acharya and Tao Xie error specifi- cations automatically from software package repositories, without requiring any user inter-procedurally scattered and not always correctly coded by the programmers, manually inferring
State preservation by repetitive error detection in a superconducting quantum circuit J. Kelly,1,
Martinis, John M.
State preservation by repetitive error detection in a superconducting quantum circuit J. Kelly,1 , and superconducting circuits1113 have demonstrated multi-qubit states that are first-order toler- ant to one type of error. Recently, experiments with ion traps and superconducting circuits have shown the simultaneous de
Integrated Control-Path Design and Error Recovery in the Synthesis of Digital
Chakrabarty, Krishnendu
11 Integrated Control-Path Design and Error Recovery in the Synthesis of Digital Microfluidic Lab that incorporates control paths and an error- recovery mechanism in the design of a digital microfluidic lab, compared to a baseline chip design, the biochip with a control path can reduce the completion time by 30
Maintaining Standards: Differences between the Standard Deviation and Standard Error, and
California at Santa Cruz, University of
Maintaining Standards: Differences between the Standard Deviation and Standard Error, and When to Use Each David L Streiner, PhD1 Many people confuse the standard deviation (SD) and the standard error of the mean (SE) and are unsure which, if either, to use in presenting data in graphical or tabular form
A Non-Stationary Errors-in-Variables Method with Application to Mineral Exploration
Braslavsky, Julio H.
A Non-Stationary Errors-in-Variables Method with Application to Mineral Exploration K. Lau 1 J. H-cancellation in transient electromagnetic mineral exploration. Alternative methods for noise cancellation in these systems for this class of systems is proposed and applied to a problem arising in mineral exploration. An errors
Threshold analysis with fault-tolerant operations for nonbinary quantum error correcting codes
Kanungo, Aparna
2005-11-01T23:59:59.000Z
Quantum error correcting codes have been introduced to encode the data bits in extra redundant bits in order to accommodate errors and correct them. However, due to the delicate nature of the quantum states or faulty gate operations, there is a...
A System for 3D Error Visualization and Assessment of Digital Elevation Models
Gousie, Michael B.
A System for 3D Error Visualization and Assessment of Digital Elevation Models Michael B. Gousie that displays a DEM and possible errors in 3D, along with its associated contour or sparse data and detail. The cutting tool is semi-transparent so that the profile is seen in the context of the 3D surface
An Energy-Aware Fault Tolerant Scheduling Framework for Soft Error Resilient Cloud Computing Systems
Pedram, Massoud
An Energy-Aware Fault Tolerant Scheduling Framework for Soft Error Resilient Cloud Computing has drastically increased their susceptibility to soft errors. At the grand scale of cloud computing outputs or system crash. At the grand scale of cloud computing, this problem can only worsen [2, 3, 4, 5
Embedded packet video transmission over wireless channels using power control and forward error
Granelli, Fabrizio
for implementing packet prioritization based on a non-uniform allocation of the available transmission energy high percentage of transmission errors in the wireless medium and the limited energy of portable energy distribution is jointly employed with error correction schemes in order to achieve optimal non
Database Error Trapping and Prediction Mike West & Robert L. Winkler \\Lambda
West, Mike
, such as electronic components or systems, or components of computer software systems, that are subject to regimes and reliability control being of particular note. Keywords: ERROR DETECTION, ERROR RATES, DATA QUALITY, DATA MAN. Exam ples in industrial quality and reliability control may concern manufactured items
A posteriori error estimates, stopping criteria, and adaptivity for multiphase compositional Darcy derive a posteriori error estimates for the compositional model of multiphase Darcy flow in porous media, consisting of a system of strongly coupled nonlinear unsteady partial differential and algebraic equations
ASC Report No. 45/2012 A Numerical Study of Averaging Error
Melenk, Jens Markus
polynomials of the same polynomial degree as the finite element solution leads to reliability and efficiency], is a widely used method for gauging errors in finite element methods and steering adaptive mesh refinements and M. Tutz A review of stability and error theory for collocation methods applied to linear boundary
Improving the Accuracy of Industrial Robots by offline Compensation of Joints Errors
Paris-Sud XI, Université de
Improving the Accuracy of Industrial Robots by offline Compensation of Joints Errors Adel Olabi.damak@geomnia.eu Abstract--The use of industrial robots in many fields of industry like prototyping, pre-machining and end errors. Identification methods are presented with experimental validation on a 6 axes industrial robot
Potential Hydraulic Modelling Errors Associated with Rheological Data Extrapolation in Laminar Flow
Shadday, Martin A., Jr.
1997-03-20T23:59:59.000Z
The potential errors associated with the modelling of flows of non-Newtonian slurries through pipes, due to inadequate rheological models and extrapolation outside of the ranges of data bases, are demonstrated. The behaviors of both dilatant and pseudoplastic fluids with yield stresses, and the errors associated with treating them as Bingham plastics, are investigated.
Outage Probability for Free-Space Optical Systems Over Slow Fading Channels With Pointing Errors
Hranilovic, Steve
Outage Probability for Free-Space Optical Systems Over Slow Fading Channels With Pointing Errors, Canada. Email: farid@grads.ece.mcmaster.ca, hranilovic@mcmaster.ca Abstract-- We investigate the outage errors. An expression for the outage probability is derived and we show that optimizing the transmit- ted
Paris-Sud XI, Université de
Network Code Design from Unequal Error Protection Coding: Channel-Aware Receiver Design.iezzi, fabio.graziosi}@univaq.it Abstract-- In this paper, we propose Unequal Error Protection (UEP) coding theory as a viable and flexible method for the design of network codes for multisource multirelay
Almasi, Gheorghe (Ardsley, NY) [Ardsley, NY; Blumrich, Matthias Augustin (Ridgefield, CT) [Ridgefield, CT; Chen, Dong (Croton-On-Hudson, NY) [Croton-On-Hudson, NY; Coteus, Paul (Yorktown, NY) [Yorktown, NY; Gara, Alan (Mount Kisco, NY) [Mount Kisco, NY; Giampapa, Mark E. (Irvington, NY) [Irvington, NY; Heidelberger, Philip (Cortlandt Manor, NY) [Cortlandt Manor, NY; Hoenicke, Dirk I. (Ossining, NY) [Ossining, NY; Singh, Sarabjeet (Mississauga, CA) [Mississauga, CA; Steinmacher-Burow, Burkhard D. (Wernau, DE) [Wernau, DE; Takken, Todd (Brewster, NY) [Brewster, NY; Vranas, Pavlos (Bedford Hills, NY) [Bedford Hills, NY
2008-06-03T23:59:59.000Z
Methods and apparatus perform fault isolation in multiple node computing systems using commutative error detection values for--example, checksums--to identify and to isolate faulty nodes. When information associated with a reproducible portion of a computer program is injected into a network by a node, a commutative error detection value is calculated. At intervals, node fault detection apparatus associated with the multiple node computer system retrieve commutative error detection values associated with the node and stores them in memory. When the computer program is executed again by the multiple node computer system, new commutative error detection values are created and stored in memory. The node fault detection apparatus identifies faulty nodes by comparing commutative error detection values associated with reproducible portions of the application program generated by a particular node from different runs of the application program. Differences in values indicate a possible faulty node.
Ginting, Victor
2014-03-15T23:59:59.000Z
it was demonstrated that a posteriori analyses in general and in particular one that uses adjoint methods can accurately and efficiently compute numerical error estimates and sensitivity for critical Quantities of Interest (QoIs) that depend on a large number of parameters. Activities include: analysis and implementation of several time integration techniques for solving system of ODEs as typically obtained from spatial discretization of PDE systems; multirate integration methods for ordinary differential equations; formulation and analysis of an iterative multi-discretization Galerkin finite element method for multi-scale reaction-diffusion equations; investigation of an inexpensive postprocessing technique to estimate the error of finite element solution of the second-order quasi-linear elliptic problems measured in some global metrics; investigation of an application of the residual-based a posteriori error estimates to symmetric interior penalty discontinuous Galerkin method for solving a class of second order quasi-linear elliptic problems; a posteriori analysis of explicit time integrations for system of linear ordinary differential equations; derivation of accurate a posteriori goal oriented error estimates for a user-defined quantity of interest for two classes of first and second order IMEX schemes for advection-diffusion-reaction problems; Postprocessing finite element solution; and A Bayesian Framework for Uncertain Quantification of Porous Media Flows.
The accuracy of miniature bead thermistors in the measurement of upper air temperature
Thompson, Donald C. (Donald Charles), 1933-
1967-01-01T23:59:59.000Z
A laboratory study was made of the errors of miniature bead thermistors of 5, 10, and 15 mils nominal diameter when used for the measurement of atmospheric temperature. Although the study was primarily concerned with the ...
Measurement calibration/tuning & topology processing in power system state estimation
Zhong, Shan
2005-02-17T23:59:59.000Z
State estimation plays an important role in modern power systems. The errors in the telemetered measurements and the connectivity information of the network will greatly contaminate the estimated system state. This dissertation provides solutions...
Measurement uncertainty analysis techniques applied to PV performance measurements
Wells, C.
1992-10-01T23:59:59.000Z
The purpose of this presentation is to provide a brief introduction to measurement uncertainty analysis, outline how it is done, and illustrate uncertainty analysis with examples drawn from the PV field, with particular emphasis toward its use in PV performance measurements. The uncertainty information we know and state concerning a PV performance measurement or a module test result determines, to a significant extent, the value and quality of that result. What is measurement uncertainty analysis? It is an outgrowth of what has commonly been called error analysis. But uncertainty analysis, a more recent development, gives greater insight into measurement processes and tests, experiments, or calibration results. Uncertainty analysis gives us an estimate of the I interval about a measured value or an experiment`s final result within which we believe the true value of that quantity will lie. Why should we take the time to perform an uncertainty analysis? A rigorous measurement uncertainty analysis: Increases the credibility and value of research results; allows comparisons of results from different labs; helps improve experiment design and identifies where changes are needed to achieve stated objectives (through use of the pre-test analysis); plays a significant role in validating measurements and experimental results, and in demonstrating (through the post-test analysis) that valid data have been acquired; reduces the risk of making erroneous decisions; demonstrates quality assurance and quality control measures have been accomplished; define Valid Data as data having known and documented paths of: Origin, including theory; measurements; traceability to measurement standards; computations; uncertainty analysis of results.
Michael Joyce; Bruno Marcos; Thierry Baertschiger
2008-11-26T23:59:59.000Z
The effects of discreteness arising from the use of the N-body method on the accuracy of simulations of cosmological structure formation are not currently well understood. After a discussion of how the relevant discretisation parameters introduced should be extrapolated to recover the Vlasov-Poisson limit, we study numerically, and with analytical methods we have developed recently, the central issue of how finite particle density affects the precision of results. In particular we focus on the power spectrum at wavenumbers around and above the Nyquist wavenumber, in simulations in which the force resolution is taken smaller than the initial interparticle spacing. Using simulations of identical theoretical initial conditions sampled on four different "pre-initial" configurations (three different Bravais lattices, and a glass) we obtain a {\\it lower bound} on the real discreteness error. With the guidance of our analytical results, we establish with confidence that the measured dispersion is not contaminated either by finite box size effects or by subtle numerical effects. Our results show notably that, at wavenumbers {\\it below} the Nyquist wavenumber, the dispersion increases monotonically in time throughout the simulation, while the same is true above the Nyquist wavenumber once non-linearity sets in. For normalizations typical of cosmological simulations, we find lower bounds on errors at the Nyquist wavenumber of order of a percent, and larger above this scale. The only way this error may be reduced below these levels at these scales, and indeed convergence to the physical limit firmly established, is by extrapolation, at fixed values of the other relevant parameters, to the regime in which the mean comoving interparticle distance becomes less than the force smoothing scale.
Evans, Suzanne B., E-mail: Suzannne.evans@yale.edu [Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut (United States); Yu, James B. [Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut (United States)] [Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, Connecticut (United States); Chagpar, Anees [Department of Surgery, Yale University School of Medicine, New Haven, Connecticut (United States)] [Department of Surgery, Yale University School of Medicine, New Haven, Connecticut (United States)
2012-10-01T23:59:59.000Z
Purpose: To analyze error disclosure attitudes of radiation oncologists and to correlate error disclosure beliefs with survey-assessed disclosure behavior. Methods and Materials: With institutional review board exemption, an anonymous online survey was devised. An email invitation was sent to radiation oncologists (American Society for Radiation Oncology [ASTRO] gold medal winners, program directors and chair persons of academic institutions, and former ASTRO lecturers) and residents. A disclosure score was calculated based on the number or full, partial, or no disclosure responses chosen to the vignette-based questions, and correlation was attempted with attitudes toward error disclosure. Results: The survey received 176 responses: 94.8% of respondents considered themselves more likely to disclose in the setting of a serious medical error; 72.7% of respondents did not feel it mattered who was responsible for the error in deciding to disclose, and 3.9% felt more likely to disclose if someone else was responsible; 38.0% of respondents felt that disclosure increased the likelihood of a lawsuit, and 32.4% felt disclosure decreased the likelihood of lawsuit; 71.6% of respondents felt near misses should not be disclosed; 51.7% thought that minor errors should not be disclosed; 64.7% viewed disclosure as an opportunity for forgiveness from the patient; and 44.6% considered the patient's level of confidence in them to be a factor in disclosure. For a scenario that could be considerable, a non-harmful error, 78.9% of respondents would not contact the family. Respondents with high disclosure scores were more likely to feel that disclosure was an opportunity for forgiveness (P=.003) and to have never seen major medical errors (P=.004). Conclusions: The surveyed radiation oncologists chose to respond with full disclosure at a high rate, although ideal disclosure practices were not uniformly adhered to beyond the initial decision to disclose the occurrence of the error.
Performance and Error Analysis of Knill's Postselection Scheme in a Two-Dimensional Architecture
Ching-Yi Lai; Gerardo Paz; Martin Suchara; Todd A. Brun
2013-05-31T23:59:59.000Z
Knill demonstrated a fault-tolerant quantum computation scheme based on concatenated error-detecting codes and postselection with a simulated error threshold of 3% over the depolarizing channel. %We design a two-dimensional architecture for fault-tolerant quantum computation based on Knill's postselection scheme. We show how to use Knill's postselection scheme in a practical two-dimensional quantum architecture that we designed with the goal to optimize the error correction properties, while satisfying important architectural constraints. In our 2D architecture, one logical qubit is embedded in a tile consisting of $5\\times 5$ physical qubits. The movement of these qubits is modeled as noisy SWAP gates and the only physical operations that are allowed are local one- and two-qubit gates. We evaluate the practical properties of our design, such as its error threshold, and compare it to the concatenated Bacon-Shor code and the concatenated Steane code. Assuming that all gates have the same error rates, we obtain a threshold of $3.06\\times 10^{-4}$ in a local adversarial stochastic noise model, which is the highest known error threshold for concatenated codes in 2D. We also present a Monte Carlo simulation of the 2D architecture with depolarizing noise and we calculate a pseudo-threshold of about 0.1%. With memory error rates one-tenth of the worst gate error rates, the threshold for the adversarial noise model, and the pseudo-threshold over depolarizing noise, are $4.06\\times 10^{-4}$ and 0.2%, respectively. In a hypothetical technology where memory error rates are negligible, these thresholds can be further increased by shrinking the tiles into a $4\\times 4$ layout.
Validation of Multiple Tools for Flat Plate Photovoltaic Modeling Against Measured Data
Freeman, J.; Whitmore, J.; Blair, N.; Dobos, A. P.
2014-08-01T23:59:59.000Z
This report expands upon a previous work by the same authors, published in the 40th IEEE Photovoltaic Specialists conference. In this validation study, comprehensive analysis is performed on nine photovoltaic systems for which NREL could obtain detailed performance data and specifications, including three utility-scale systems and six commercial scale systems. Multiple photovoltaic performance modeling tools were used to model these nine systems, and the error of each tool was analyzed compared to quality-controlled measured performance data. This study shows that, excluding identified outliers, all tools achieve annual errors within +/-8% and hourly root mean squared errors less than 7% for all systems. It is further shown using SAM that module model and irradiance input choices can change the annual error with respect to measured data by as much as 6.6% for these nine systems, although all combinations examined still fall within an annual error range of +/-8.5%. Additionally, a seasonal variation in monthly error is shown for all tools. Finally, the effects of irradiance data uncertainty and the use of default loss assumptions on annual error are explored, and two approaches to reduce the error inherent in photovoltaic modeling are proposed.
Error propagation equations for estimating the uncertainty in high-speed wind tunnel test results
Clark, E.L.
1994-07-01T23:59:59.000Z
Error propagation equations, based on the Taylor series model, are derived for the nondimensional ratios and coefficients most often encountered in high-speed wind tunnel testing. These include pressure ratio and coefficient, static force and moment coefficients, dynamic stability coefficients, and calibration Mach number. The error equations contain partial derivatives, denoted as sensitivity coefficients, which define the influence of free-steam Mach number, M{infinity}, on various aerodynamic ratios. To facilitate use of the error equations, sensitivity coefficients are derived and evaluated for five fundamental aerodynamic ratios which relate free-steam test conditions to a reference condition.
Willis, W.L.
1980-10-01T23:59:59.000Z
The discussion will be restricted to measurements of voltage and current. Also, although the measurements themselves should be as quantitative as possible, the discussion is rather nonquantitative. Emphasis is on types of instruments, how they may be used, and the inherent advantages and limitations of a given technique. A great deal of information can be obtained from good, clean voltage and current data. Power and impedance are obviously inherent if the proper time relationships are preserved. Often an associated, difficult-to-determine, physical event can be evaluated from the V-I data, such as a time-varying load characteristic, or the time of light emission, etc. The lack of active high voltage devices, such as 50-kV operational amplifiers, restricts measurement devices to passive elements, primarily R and C. There are a few more exotic techniques that are still passive in nature. There are several well-developed techniques for voltage measurements. These include: spark gaps; electrostatic meters; capacitive dividers; mixed RC dividers; and the electro-optic effect. Current is measured by either direct measurement of charge flow or by measuring the resulting magnetic field.
Sample size in factor analysis: The role of model error
MacCallum, R. C.; Widaman, K. F.; Preacher, Kristopher J.; Hong, Sehee
2001-01-01T23:59:59.000Z
Equation 1: (2) H9018 yy = H9011H9021H9011H11032 + H9008 2 where H9018 yy is the p ? p population covariance matrix for the measured variables and H9021 is the r ? r population correlation matrix for the common factors (assuming factors are standardized... in the population). This is the standard version of the common factor model for a population covariance matrix. Following similar algebraic procedures, we could derive a structure for a sample covariance matrix, C yy . However, in such a derivation we can...
Jiang, Boyang
2012-02-14T23:59:59.000Z
As the forecasting models become more sophisticated in their physics and possible depictions of the nearshore hydrodynamics, they also become increasingly sensitive to errors in the inputs. These input errors include: mis-specification of the input...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirt Documentation ARMupwelling irradiance ARM Data Discovery BrowseMeasurements Related LinksMeasurements
Processing Quantities with Heavy-Tailed Distribution of Measurement Uncertainty: How
Kreinovich, Vladik
Processing Quantities with Heavy-Tailed Distribution of Measurement Uncertainty: How to Estimate, the distribution of measurement errors is sometimes heavy-tailed, when very large values have a reasonable, in the amount of oil in an oil well, etc. In such situations in which we cannot measure y directly, we can often
Ability of stabilizer quantum error correction to protect itself from its own imperfection
Yuichiro Fujiwara
2014-12-02T23:59:59.000Z
The theory of stabilizer quantum error correction allows us to actively stabilize quantum states and simulate ideal quantum operations in a noisy environment. It is critical is to correctly diagnose noise from its syndrome and nullify it accordingly. However, hardware that performs quantum error correction itself is inevitably imperfect in practice. Here, we show that stabilizer codes possess a built-in capability of correcting errors not only on quantum information but also on faulty syndromes extracted by themselves. Shor's syndrome extraction for fault-tolerant quantum computation is naturally improved. This opens a path to realizing the potential of stabilizer quantum error correction hidden within an innocent looking choice of generators and stabilizer operators that have been deemed redundant.
Stability of error bounds for semi-infinite convex constraint systems
2010-01-07T23:59:59.000Z
stable if all its “small” perturbations admit a (local or global) error bound. ... where T is a compact, possibly infinite, Hausdorff space, ft : Rn ? R, t ? T, are given ...
The Effect of OCR Errors on Stylistic Text Classification Sterling Stuart Stein
The Effect of OCR Errors on Stylistic Text Classification Sterling Stuart Stein Linguistic retrieval; Taghva and Coombs [1] found that a search engine could be made to work well over OCR documents
An Analysis of the Effect of Gaussian Error in Object Recognition
Sarachik, Karen Beth
1994-02-01T23:59:59.000Z
Object recognition is complicated by clutter, occlusion, and sensor error. Since pose hypotheses are based on image feature locations, these effects can lead to false negatives and positives. In a typical recognition ...
Methodology to Analyze the Sensitivity of Building Energy Consumption to HVAC System Sensor Error
Ma, Liang
2012-02-14T23:59:59.000Z
This thesis proposes a methodology for determining sensitivity of building energy consumption of HVAC systems to sensor error. It is based on a series of simulations of a generic building, the model for which is based on several typical input...
Error and uncertainty in estimates of Reynolds stress using ADCP in an energetic ocean state
Rapo, Mark Andrew.
2006-01-01T23:59:59.000Z
(cont.) To that end, the space-time correlations of the error, turbulence, and wave processes are developed and then utilized to find the extent to which the environmental and internal processing parameters contribute to ...
Estimating market power in homogeneous product markets using a composed error model
Orea, Luis; Steinbuks, Jevgenijs
2012-04-25T23:59:59.000Z
This study contributes to the literature on estimating market power in homogenous product markets. We estimate a composed error model, where the stochastic part of the firm?s pricing equation is formed by two random variables...
Absolute Percent Error Based Fitness Functions for Evolving Forecast Models AndyNovobilski,Ph.D.
Fernandez, Thomas
Absolute Percent Error Based Fitness Functions for Evolving Forecast Models Andy computfi~gas a methodof data mining,is its intrinsic ability to drive modelselection accordingto a mixedset of criteria. Basedon natural selection, evolutionary computing utilizes evaluationof candidatesolutions
Locatelli, R.
A modelling experiment has been conceived to assess the impact of transport model errors on methane emissions estimated in an atmospheric inversion system. Synthetic methane observations, obtained from 10 different model ...
Gilles Lachaud For detecting and correcting the inevitable errors which creep in during
Provence Aix-Marseille I, Université de
Gilles Lachaud For detecting and correcting the inevitable errors which creep in during digital by the grea- test possible number of discs of the same size without any overlaps. #12;The words of a message
On the evaluation of human error probabilities for post-initiating events
Presley, Mary R
2006-01-01T23:59:59.000Z
Quantification of human error probabilities (HEPs) for the purpose of human reliability assessment (HRA) is very complex. Because of this complexity, the state of the art includes a variety of HRA models, each with its own ...
Combined wavelet video coding and error control for internet streaming and multicast
Chu, Tianli
2002-01-01T23:59:59.000Z
an integrated approach toward Internet video streaming and multicast based on combined wavelet video coding and error control. We design a packetized wavelet video (PWV) coder, by incorporating packetization and layered coding, to facilitate its integration...
Combined wavelet video coding and error control for internet streaming and multicast
Chu, Tianli
2002-01-01T23:59:59.000Z
In the past several years, advances in Internet video streaming have been tremendous. Originally designed without error protection, Receiver-driven layered multicast (RLM) has proved to be a very effective scheme for scalable video multicast. Though...
V-194: Citrix XenServer Memory Management Error Lets Local Administrat...
Broader source: Energy.gov (indexed) [DOE]
a memory management page reference counting error to gain access on the target host server. IMPACT: A local user on the guest operating system can obtain access on the target...
Effects of systematic phase errors on optimized quantum random-walk search algorithm
Yu-Chao Zhang; Wan-Su Bao; Xiang Wang; Xiang-Qun Fu
2015-01-09T23:59:59.000Z
This paper researches how the systematic errors in phase inversions affect the success rate and the number of iterations in optimized quantum random-walk search algorithm. Through geometric description of this algorithm, the model of the algorithm with phase errors is established and the relationship between the success rate of the algorithm, the database size, the number of iterations and the phase error is depicted. For a given sized database, we give both the maximum success rate of the algorithm and the required number of iterations when the algorithm is in the presence of phase errors. Through analysis and numerical simulations, it shows that optimized quantum random-walk search algorithm is more robust than Grover's algorithm.
Analysis of atmospheric delays and asymmetric positioning errors in the global positioning system
Materna, Kathryn
2014-01-01T23:59:59.000Z
Abstract Errors in modeling atmospheric delays are one of the limiting factors in the accuracy of GPS position determination. In regions with uneven topography, atmospheric delay phenomena can be especially complicated. ...
Efficient error correction for speech systems using constrained re-recognition
Yu, Gregory T
2008-01-01T23:59:59.000Z
Efficient error correction of recognition output is a major barrier in the adoption of speech interfaces. This thesis addresses this problem through a novel correction framework and user interface. The system uses constraints ...
Title and author(s) Notes on Human Error Analysis and
calibration and testing as found in the US Licensee Event Reports. Available on request from Risø Library JUDGEMENT 4 "HUMAN ERROR" - DEFINITION AND CLASSIFICATION 6 RELIABILITY AND SAFETY ANALYSIS 10 HUMAN FACTORS
Grid-search event location with non-Gaussian error models
Rodi, William L.
This study employs an event location algorithm based on grid search to investigate the possibility of improving seismic event location accuracy by using non-Gaussian error models. The primary departure from the Gaussian ...
Verifica(on of Hurricane Irene, Isaac and Sandy's Storm Track, Intensity, and Wind Radii Errors
Miami, University of
Verifica(on of Hurricane Irene, Isaac and Sandy's Storm Track, Intensity/onal Hurricane Center (NHC). Forecasts of the track have steadily improved over the past, intensity (MWND) and wind radii (WRAD) errors of Hurricane Irene (2011
Methodology to Analyze the Sensitivity of Building Energy Consumption to HVAC System Sensor Error
Ma, Liang
2012-02-14T23:59:59.000Z
This thesis proposes a methodology for determining sensitivity of building energy consumption of HVAC systems to sensor error. It is based on a series of simulations of a generic building, the model for which is based on several typical input...
Error Detection Techniques Applicable in an Architecture Framework and Design Methodology for
Ould Ahmedou, Mohameden
/environmental variations and external radiation caus- ing so-called soft-errors. Overall, these trends result in a severe in analogy to the IP library of the functional layer shall eventually represent an autonomic IP library (AE
Error analysis of motion transmission mechanisms : design of a parabolic solar trough
Koniski, Cyril (Cyril A.)
2009-01-01T23:59:59.000Z
This thesis presents the error analysis pertaining to the design of an innovative solar trough for use in solar thermal energy generation fields. The research was a collaborative effort between Stacy Figueredo from Prof. ...
Conway, Barbara Tenney
2012-10-19T23:59:59.000Z
.............................................................................. x NOMENCLATURE ............................................................................. xi CHAPTER I INTRODUCTION ............................................................ 1 Theories of Spelling Development... levels in school. Stage theory of spelling development has provided a solid structure upon which spelling curricula can be designed, and spelling error analysis serves as the foundational screening component for planning of instruction (Bear...
Havinga, Paul J.M.
Abstract -- Since high error rates are inevitable to the wireless environment, energy mechanisms only, but the required extra energy consumed by the wireless interface should be incorporated energy consumption is a key issue for portable wireless network devices like computers like PDAs
Software Productivity Measurement Using Multiple Size Measures
Bae, Doo-Hwan
Software Productivity Measurement Using Multiple Size Measures Software Productivity MeasurementContents Introduction Background Related work Motivation Productivity measurement - Measurement model - Productivity measure construction - Productivity analysis Conclusion Discussion #12;Software Engineering Lab, KAIST 3
Constructivism, measurement, mathematics Concepts of measurement
Hennig, Christian
Constructivism, measurement, mathematics Concepts of measurement Measurement and statistics Conclusion Measurement as a constructive act - a statistician's view Christian Hennig March 14, 2013 Christian Hennig Measurement as a constructive act - a statistician's view #12;Constructivism, measurement
Eldred, Michael Scott; Subia, Samuel Ramirez; Neckels, David; Hopkins, Matthew Morgan; Notz, Patrick K.; Adams, Brian M.; Carnes, Brian; Wittwer, Jonathan W.; Bichon, Barron J.; Copps, Kevin D.
2006-10-01T23:59:59.000Z
This report documents the results for an FY06 ASC Algorithms Level 2 milestone combining error estimation and adaptivity, uncertainty quantification, and probabilistic design capabilities applied to the analysis and design of bistable MEMS. Through the use of error estimation and adaptive mesh refinement, solution verification can be performed in an automated and parameter-adaptive manner. The resulting uncertainty analysis and probabilistic design studies are shown to be more accurate, efficient, reliable, and convenient.
Estimating rock properties in two phase petroleum reservoirs: an error analysis
Paul, Anthony Ian
1983-01-01T23:59:59.000Z
ESTIMATING ROCK PROPERTIES IN TWO PHASE PETROLEUM RESERVOIRS: AN ERROR ANALYSIS A Thesis by ANTHONY IAN PAUL Submitted to the Graduate College of Texas AE:M University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE December 1983 Maior Subjecu Chemical Engineering ESTIMATING ROCK PROPERTIES IN TWO PHASE PETROLEUM RESERVOIRS: AN ERROR ANALYSIS A Thesis by ANTHONY IAN PAUL Approved as to style and content by: A. T. Watson (Chairman of Commiuee) C. J...
Gavini, Shanti
2001-01-01T23:59:59.000Z
CODE ASSIGNMENT OF RATE COMPATIBLE PUNCTURED CONVOLUTIONAL CODES F' OR UNEQUAL ERROR PROTECTION REQUIRElvIENTS A Thesis by SHANTI GAVIUI Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of thc... requirements for the degree of MASTER OF SCIENCE May 2001 Major Subject: Electrical Engineering CODE ASSIGNMENT OF RATE COMPATIBLE PUNCTURED CONVOLUTIONAL CODES FOR UNEQUAL ERROR PROTECTION REQUIREMENTS A Thesis by SHANTI GAVINI Submitted to Texas A...
Analysis of error in using fractured gas well type curves for constant pressure production
Schkade, David Wayne
1987-01-01T23:59:59.000Z
ANALYSIS DF ERROR IN USING FRACTURED GAS WELL TYPE CURVES FOR CONSTANT PRESSURE PRODUCTION A Thesis by DAVID WAYNE SCHKADE Submitted to the Graduate College of Texas ASM University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE May 1987 Major Subject: Petroleum Engineering ANALYSIS OF ERROR IN USING FRACTURED GAS WELL TYPE CURVES FOR CONSTANT PRESSURE PRDDUCTION A Thesis by DAVID WAYNE SCHKADE Approved as to style and content by: S. A. Ho lditch...
Design consistency and driver error as reflected by driver workload and accident rates
Wooldridge, Mark Douglas
1992-01-01T23:59:59.000Z
DESIGN CONSISTENCY AND DRIVER ERROR AS REFLECTED BY DRIVER WORKLOAD AND ACCIDENT RATES A Thesis by MARK DOUGLAS WOOLDRIDGE Approved as to style and content by: Daniel B. Fambro (Chair of Committee) Raymond A. Krammes (Member) Olga J.... Pendleton (Member) James T. P. Yao (Head of Department) May 1992 ABSTRACT Design Consistency and Driver Error as Reflected by Driver Workload and Accident Rates (May 1992) Mark Douglas Wooldridge, B. S. , Texas A&M University Chair of Advisory...
Kaeli, David R.
Case Study: Soft Error Rate Analysis in Storage Systems Brian Mullins, Hossein Asadi, Mehdi B Soft errors due to cosmic particles are a growing relia- bility threat for VLSI systems. In this paper we analyze the soft error vulnerability of FPGAs used in storage systems. Since the reliability
Kaeli, David R.
Case Study: Soft Error Rate Analysis in Storage Systems Brian Mullins, Hossein Asadi, Mehdi B the soft error vulnerability of FPGAs used in storage systems. Since the reliability requirements of such systems play a critical role in overall system reliability. We have val idated soft error projections
Confirmation of standard error analysis techniques applied to EXAFS using simulations
Booth, Corwin H; Hu, Yung-Jin
2009-12-14T23:59:59.000Z
Systematic uncertainties, such as those in calculated backscattering amplitudes, crystal glitches, etc., not only limit the ultimate accuracy of the EXAFS technique, but also affect the covariance matrix representation of real parameter errors in typical fitting routines. Despite major advances in EXAFS analysis and in understanding all potential uncertainties, these methods are not routinely applied by all EXAFS users. Consequently, reported parameter errors are not reliable in many EXAFS studies in the literature. This situation has made many EXAFS practitioners leery of conventional error analysis applied to EXAFS data. However, conventional error analysis, if properly applied, can teach us more about our data, and even about the power and limitations of the EXAFS technique. Here, we describe the proper application of conventional error analysis to r-space fitting to EXAFS data. Using simulations, we demonstrate the veracity of this analysis by, for instance, showing that the number of independent dat a points from Stern's rule is balanced by the degrees of freedom obtained from a 2 statistical analysis. By applying such analysis to real data, we determine the quantitative effect of systematic errors. In short, this study is intended to remind the EXAFS community about the role of fundamental noise distributions in interpreting our final results.
Palle E. T. Jorgensen
2007-07-23T23:59:59.000Z
While finite non-commutative operator systems lie at the foundation of quantum measurement, they are also tools for understanding geometric iterations as used in the theory of iterated function systems (IFSs) and in wavelet analysis. Key is a certain splitting of the total Hilbert space and its recursive iterations to further iterated subdivisions. This paper explores some implications for associated probability measures (in the classical sense of measure theory), specifically their fractal components. We identify a fractal scale $s$ in a family of Borel probability measures $\\mu$ on the unit interval which arises independently in quantum information theory and in wavelet analysis. The scales $s$ we find satisfy $s\\in \\mathbb{R}_{+}$ and $s\
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Measurements of electron temperature in the ionosphere using a low-frequency impedance meter
Aksenov, V.I.; Modestov, A.P.; Sokolov, L.Yu.
1987-07-01T23:59:59.000Z
Two ways of measuring the electron temperature in the ionosphere are proposed, based on measurements in the low-frequency range of the impedance of an electrical whip antenna mounted on an earth satellite. The errors are analyzed and the sources of possible systematic errors and methods of allowing for them are discussed. Some results of measurements of electron temperature on the Interkosmos-Kopernik 500 satellite, made in the period of the autumnal equinox at temperate latitudes during a solar activity minimum, are given. The data obtained are in fully satisfactory agreement with the results of measurements of electron temperature by other methods known from the literature.
Wei, Shuangqing
for power control and dynamic channel allocation in wireless communication systems. However, due of power control algorithms that minimize the average transmitted power required to achieve a desired outage probability for the link is considered. A number of novel power control algorithms based
Wilinska, Malgorzata E.; Hovorka, Roman
2014-10-07T23:59:59.000Z
were reversed. The Yale protocol was most balanced with 50% of time spent in a tight glucose range and a low risk of hypoglycemia. Additional analyses contrasted CGM imprecision and bias. In agreement with Boyd and Bruns [20], we observed a... observations in an appropriately designed clinical study is desirable but is logistically and ethically challenging. Accuracy of glucose meters in the ICU has been studied extensively [10-13] although accuracy guidelines and standards are being debated...
WIND ATLAS FOR EGYPT: MEASUREMENTS, MICRO-AND MESOSCALE MODELLING
WIND ATLAS FOR EGYPT: MEASUREMENTS, MICRO- AND MESOSCALE MODELLING Niels G. Mortensen1 , Jens atlas based on long-term reanalysis data and a mesoscale model (KAMM). The mean absolute error comparing atlas based on long-term reanalysis data and a mesoscale model, KAMM. The observations have been
Thorough approach to measurement uncertainty analysis applied to immersed heat exchanger testing
Farrington, R.B.; Wells, C.V.
1986-04-01T23:59:59.000Z
This paper discusses the value of an uncertainty analysis, discusses how to determine measurement uncertainty, and then details the sources of error in instrument calibration, data acquisition, and data reduction for a particular experiment. Methods are discussed to determine both the systematic (or bias) error in an experiment as well as to determine the random (or precision) error in the experiment. The detailed analysis is applied to two sets of conditions in measuring the effectiveness of an immersed coil heat exchanger. It shows the value of such analysis as well as an approach to reduce overall measurement uncertainty and to improve the experiment. This paper outlines how to perform an uncertainty analysis and then provides a detailed example of how to apply the methods discussed in the paper. The authors hope this paper will encourage researchers and others to become more concerned with their measurement processes and to report measurement uncertainty with all of their test results.
Huang, Weidong
2011-01-01T23:59:59.000Z
This paper presents the general equation to calculate the standard deviation of reflected ray error from optical error through geometry optics, applying the equation to calculate the standard deviation of reflected ray error for 8 kinds of solar concentrated reflector, provide typical results. The results indicate that the slope errors in two direction is transferred to any one direction of the focus ray when the incidence angle is more than 0 for solar trough and heliostats reflector; for point focus Fresnel lens, point focus parabolic glass mirror, line focus parabolic galss mirror, the error transferring coefficient from optical to focus ray will increase when the rim angle increase; for TIR-R concentrator, it will decrease; for glass heliostat, it relates to the incidence angle and azimuth of the reflecting point. Keywords: optic error, standard deviation, refractive ray error, concentrated solar collector
Sommargren, Gary E. (Santa Cruz, CA); Campbell, Eugene W. (Livermore, CA)
2005-06-21T23:59:59.000Z
To measure a convex mirror, a reference beam and a measurement beam are both provided through a single optical fiber. A positive auxiliary lens is placed in the system to give a converging wavefront onto the convex mirror under test. A measurement is taken that includes the aberrations of the convex mirror as well as the errors due to two transmissions through the positive auxiliary lens. A second measurement provides the information to eliminate this error. A negative lens can also be measured in a similar way. Again, there are two measurement set-ups. A reference beam is provided from a first optical fiber and a measurement beam is provided from a second optical fiber. A positive auxiliary lens is placed in the system to provide a converging wavefront from the reference beam onto the negative lens under test. The measurement beam is combined with the reference wavefront and is analyzed by standard methods. This measurement includes the aberrations of the negative lens, as well as the errors due to a single transmission through the positive auxiliary lens. A second measurement provides the information to eliminate this error.
Sommargren, Gary E.; Campbell, Eugene W.
2004-03-09T23:59:59.000Z
To measure a convex mirror, a reference beam and a measurement beam are both provided through a single optical fiber. A positive auxiliary lens is placed in the system to give a converging wavefront onto the convex mirror under test. A measurement is taken that includes the aberrations of the convex mirror as well as the errors due to two transmissions through the positive auxiliary lens. A second, measurement provides the information to eliminate this error. A negative lens can also be measured in a similar way. Again, there are two measurement set-ups. A reference beam is provided from a first optical fiber and a measurement beam is provided from a second optical fiber. A positive auxiliary lens is placed in the system to provide a converging wavefront from the reference beam onto the negative lens under test. The measurement beam is combined with the reference wavefront and is analyzed by standard methods. This measurement includes the aberrations of the negative lens, as well as the errors due to a single transmission through the positive auxiliary lens. A second measurement provides the information to eliminate this error.
Aguilar-Arevalo, A A; Bazarko, A O; Brice, S J; Brown, B C; Bugel, L; Cao, J; Coney, L; Conrad, J M; Cox, D C; Curioni, A; Djurcic, Z; Finley, D A; Fleming, B T; Ford, R; Garcia, F G; Garvey, G T; Gonzales, J; Grange, J; Green, C; Green, J A; Hart, T L; Hawker, E; Imlay, R; Johnson, R A; Karagiorgi, G; Kasper, P; Katori, T; Kobilarcik, T; Kourbanis, I; Koutsoliotas, S; Laird, E M; Linden, S K; Link, J M; Liu, Y; Louis, W C; Mahn, K B M; Marsh, W; Mauger, C; McGary, V T; McGregor, G; Metcalf, W; Meyers, P D; Mills, F; Mills, G B; Monroe, J; Moore, C D; Mousseau, J; Nelson, R H; Nienaber, P; Nowak, J A; Osmanov, B; Ouedraogo, S; Patterson, R B; Pavlovic, Z; Perevalov, D; Polly, C C; Prebys, E; Raaf, J L; Ray, H; Roe, B P; Russell, A D; Sandberg, V; Schirato, R; Schmitz, D; Shaevitz, M H; Shoemaker, F C; Smith, D; Soderberg, M; Sorel, M; Spentzouris, P; Spitz, J; Stancu, I; Stefanski, R J; Sung, M; Tanaka, H A; Tayloe, R; Tzanov, M; Van de Water, R G; Wascko, M O; White, D H; Wilking, M J; Yang, H J; Zeller, G P; Zimmerman, E D
2009-01-01T23:59:59.000Z
MiniBooNE reports the first absolute cross sections for neutral current single \\pi^0 production on CH_2 induced by neutrino and antineutrino interactions measured from the largest sets of NC \\pi^0 events collected to date. The principal result consists of differential cross sections measured as functions of \\pi^0 momentum and \\pi^0 angle averaged over the neutrino flux at MiniBooNE. We find total cross sections of (4.76+/-0.05_{stat}+/-0.40_{sys})*10^{-40} cm^2/nucleon at a mean energy of =808 MeV and (1.48+/-0.05_{stat}+/-0.14_{sys})*10^{-40} cm^2/nucleon at a mean energy of =664 MeV for \
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirt Documentation ARMupwelling irradiance ARM Data Discovery BrowseMeasurements Related Links MC3E
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirt Documentation ARMupwelling irradiance ARM Data Discovery BrowseMeasurements Related Links
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirtA JourneygovCampaignsPajaritogovField CampaignsMidlatitude Continental ConvectivegovMeasurementsCloud
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirtA JourneygovCampaignsPajaritogovField CampaignsMidlatitude ContinentalgovMeasurementsSurface Properties
S. D. Bloom; D. A. Dale; R. Cool; K. Dupczak; C. Miller; A. Haugsjaa; C. Peters; M. Tornikoski; P. Wallace; M. Pierce
2004-04-02T23:59:59.000Z
We present the most recent results of an optical survey of the position error contours ("error boxes") of unidentified high energy gamma-ray sources.
Olama, Mohammed M [ORNL; Matalgah, Mustafa M [ORNL; Bobrek, Miljko [ORNL
2015-01-01T23:59:59.000Z
Traditional encryption techniques require packet overhead, produce processing time delay, and suffer from severe quality of service deterioration due to fades and interference in wireless channels. These issues reduce the effective transmission data rate (throughput) considerably in wireless communications, where data rate with limited bandwidth is the main constraint. In this paper, performance evaluation analyses are conducted for an integrated signaling-encryption mechanism that is secure and enables improved throughput and probability of bit-error in wireless channels. This mechanism eliminates the drawbacks stated herein by encrypting only a small portion of an entire transmitted frame, while the rest is not subject to traditional encryption but goes through a signaling process (designed transformation) with the plaintext of the portion selected for encryption. We also propose to incorporate error correction coding solely on the small encrypted portion of the data to drastically improve the overall bit-error rate performance while not noticeably increasing the required bit-rate. We focus on validating the signaling-encryption mechanism utilizing Hamming and convolutional error correction coding by conducting an end-to-end system-level simulation-based study. The average probability of bit-error and throughput of the encryption mechanism are evaluated over standard Gaussian and Rayleigh fading-type channels and compared to the ones of the conventional advanced encryption standard (AES).
TIM3 Front-Panel 1. VE: Flash for VME bus access error OR On for Geog-Addr error (i.e. wrong slot).
University College London
-Busy (note: In Stand-Alone Mode TIM is normally busy) 4. TB: Shows status of TIM-BusyOut All LEDs (apart from power supplies) have a 60ms pulse stretcher for better visibility. -5 -12 OR VE SA SC TB CA BR SP +5 +3 Error1 -5V, -12V Power On Stand-Alone Mode Enabled Stand-Alone Clock Present TIM BusyOut4 ROD Busy's (1
Multiparameter measurement utilizing poloidal polarimeter for burning plasma reactor
Imazawa, Ryota; Kawano, Yasunori; Itami, Kiyoshi; Kusama, Yoshinori [Japan Atomic Energy Agency, 801-1 Mukoyama, Naka, Ibaraki, 311-0193 (Japan)
2014-08-21T23:59:59.000Z
The authors have made the basic and applied research on the polarimeter for plasma diagnostics. Recently, the authors have proposed an application of multiparameter measurement (magnetic field, B, electron density, n{sub e}, electron temperature, T{sub e}, and total plasma current, I{sub p}) utilizing polarimeter to future fusion reactors. In this proceedings, the brief review of the polarimeter, the principle of the multiparameter measurement and the progress of the research on the multiparameter measurement are explained. The measurement method that the authors have proposed is suitable for the reactor for the following reasons; multiparameters can be obtained from a small number of diagnostics, the proposed method does not depend on time-history, and far-infrared light utilized by the polarimeter is less sensitive to degradation of of optical components. Taking into account the measuring error, performance assessment of the proposed method was carried. Assuming that the error of ?? and ?? were 0.1° and 0.6°, respectively, the error of reconstructed j{sub ?}, n{sub e} and T{sub e} were 12 %, 8.4 % and 31 %, respectively. This study has shown that the reconstruction error can be decreased by increasing the number of the wavelength of the probing laser and by increasing the number of the viewing chords. For example, By increasing the number of viewing chords to forty-five, the error of j{sub ?}, n{sub e} and T{sub e} were reduced to 4.4 %, 4.4 %, and 17 %, respectively.
Earth's Magnetic Field Measurements for the LCLS Undulators
Hacker, Kirsten
2010-12-13T23:59:59.000Z
Measurements of the earth's magnetic field at several locations at SLAC were conducted to determine the possible field error contribution from tuning the undulators in a location with a different magnetic field than that which will be found in the undulator hall. An average difference of 0.08 {+-} 0.04 Gauss has been measured between the downward earth's field components in the test facility and SLAC tunnel locations.
Lamb, James M., E-mail: jlamb@mednet.ucla.edu; Agazaryan, Nzhde; Low, Daniel A.
2013-10-01T23:59:59.000Z
Purpose: To determine whether kilovoltage x-ray projection radiation therapy setup images could be used to perform patient identification and detect gross errors in patient setup using a computer algorithm. Methods and Materials: Three patient cohorts treated using a commercially available image guided radiation therapy (IGRT) system that uses 2-dimensional to 3-dimensional (2D-3D) image registration were retrospectively analyzed: a group of 100 cranial radiation therapy patients, a group of 100 prostate cancer patients, and a group of 83 patients treated for spinal lesions. The setup images were acquired using fixed in-room kilovoltage imaging systems. In the prostate and cranial patient groups, localizations using image registration were performed between computed tomography (CT) simulation images from radiation therapy planning and setup x-ray images corresponding both to the same patient and to different patients. For the spinal patients, localizations were performed to the correct vertebral body, and to an adjacent vertebral body, using planning CTs and setup x-ray images from the same patient. An image similarity measure used by the IGRT system image registration algorithm was extracted from the IGRT system log files and evaluated as a discriminant for error detection. Results: A threshold value of the similarity measure could be chosen to separate correct and incorrect patient matches and correct and incorrect vertebral body localizations with excellent accuracy for these patient cohorts. A 10-fold cross-validation using linear discriminant analysis yielded misclassification probabilities of 0.000, 0.0045, and 0.014 for the cranial, prostate, and spinal cases, respectively. Conclusions: An automated measure of the image similarity between x-ray setup images and corresponding planning CT images could be used to perform automated patient identification and detection of localization errors in radiation therapy treatments.
HUMAN ERROR QUANTIFICATION USING PERFORMANCE SHAPING FACTORS IN THE SPAR-H METHOD
Harold S. Blackman; David I. Gertman; Ronald L. Boring
2008-09-01T23:59:59.000Z
This paper describes a cognitively based human reliability analysis (HRA) quantification technique for estimating the human error probabilities (HEPs) associated with operator and crew actions at nuclear power plants. The method described here, Standardized Plant Analysis Risk-Human Reliability Analysis (SPAR-H) method, was developed to aid in characterizing and quantifying human performance at nuclear power plants. The intent was to develop a defensible method that would consider all factors that may influence performance. In the SPAR-H approach, calculation of HEP rates is especially straightforward, starting with pre-defined nominal error rates for cognitive vs. action-oriented tasks, and incorporating performance shaping factor multipliers upon those nominal error rates.
Fade-resistant forward error correction method for free-space optical communications systems
Johnson, Gary W. (Livermore, CA); Dowla, Farid U. (Castro Valley, CA); Ruggiero, Anthony J. (Livermore, CA)
2007-10-02T23:59:59.000Z
Free-space optical (FSO) laser communication systems offer exceptionally wide-bandwidth, secure connections between platforms that cannot other wise be connected via physical means such as optical fiber or cable. However, FSO links are subject to strong channel fading due to atmospheric turbulence and beam pointing errors, limiting practical performance and reliability. We have developed a fade-tolerant architecture based on forward error correcting codes (FECs) combined with delayed, redundant, sub-channels. This redundancy is made feasible though dense wavelength division multiplexing (WDM) and/or high-order M-ary modulation. Experiments and simulations show that error-free communications is feasible even when faced with fades that are tens of milliseconds long. We describe plans for practical implementation of a complete system operating at 2.5 Gbps.
Error correcting code with chip kill capability and power saving enhancement
Gara, Alan G. (Mount Kisco, NY); Chen, Dong (Croton On Husdon, NY); Coteus, Paul W. (Yorktown Heights, NY); Flynn, William T. (Rochester, MN); Marcella, James A. (Rochester, MN); Takken, Todd (Brewster, NY); Trager, Barry M. (Yorktown Heights, NY); Winograd, Shmuel (Scarsdale, NY)
2011-08-30T23:59:59.000Z
A method and system are disclosed for detecting memory chip failure in a computer memory system. The method comprises the steps of accessing user data from a set of user data chips, and testing the user data for errors using data from a set of system data chips. This testing is done by generating a sequence of check symbols from the user data, grouping the user data into a sequence of data symbols, and computing a specified sequence of syndromes. If all the syndromes are zero, the user data has no errors. If one of the syndromes is non-zero, then a set of discriminator expressions are computed, and used to determine whether a single or double symbol error has occurred. In the preferred embodiment, less than two full system data chips are used for testing and correcting the user data.
Hodge, B. M.; Lew, D.; Milligan, M.
2013-01-01T23:59:59.000Z
Load forecasting in the day-ahead timescale is a critical aspect of power system operations that is used in the unit commitment process. It is also an important factor in renewable energy integration studies, where the combination of load and wind or solar forecasting techniques create the net load uncertainty that must be managed by the economic dispatch process or with suitable reserves. An understanding of that load forecasting errors that may be expected in this process can lead to better decisions about the amount of reserves necessary to compensate errors. In this work, we performed a statistical analysis of the day-ahead (and two-day-ahead) load forecasting errors observed in two independent system operators for a one-year period. Comparisons were made with the normal distribution commonly assumed in power system operation simulations used for renewable power integration studies. Further analysis identified time periods when the load is more likely to be under- or overforecast.
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article)41clothThe Bonneville PowerTariff Pages default Sign InCenter3.82MappingEnergy: A U.S.1 H( 7 Be,Measurements of
Office of Scientific and Technical Information (OSTI)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,Separation 23Tribal EnergyCatalytic Coby Mods 002,Scientific andInformationEnergy,Article) |Measuring Dopamine
Error Channels and the Threshold for Fault-tolerant Quantum Computation
Bryan Eastin
2007-10-15T23:59:59.000Z
This dissertation treats the topics of threshold calculation, ancilla construction, and non-standard error models. Chapter 2 introduces background material ranging from quantum mechanics to classical coding to thresholds for quantum computation. In Chapter 3 numerical and analytical means are used to generate estimates of and bounds on the threshold given an error model described by a restricted stochastic Pauli channel. Chapter 4 develops a simple, flexible means of estimating the threshold and applies it to some cases of interest. Finally, a novel method of ancilla construction is proposed in Chapter 5, and the difficulties associated with implementing it are discussed.
Low delay and area efficient soft error correction in arbitration logic
Sugawara, Yutaka
2013-09-10T23:59:59.000Z
There is provided an arbitration logic device for controlling an access to a shared resource. The arbitration logic device comprises at least one storage element, a winner selection logic device, and an error detection logic device. The storage element stores a plurality of requestors' information. The winner selection logic device selects a winner requestor among the requestors based on the requestors' information received from a plurality of requestors. The winner selection logic device selects the winner requestor without checking whether there is the soft error in the winner requestor's information.
Estimating rock properties in two phase petroleum reservoirs: an error analysis
Paul, Anthony Ian
1983-01-01T23:59:59.000Z
by the same amount from the true porosity value. In Fig. 5, the objective function is slightly better represented by the series approximation in 1/4. A Monte Carlo study was performed using the same history matching conditions as for the permeability... estimates were used in a Monte Carlo study to calculate the predicted well values, after the history matching period. The errors in the rock property estimates increases rapidly with an increasing number of unknowns. In many cases, even when large errors...
Sequence decoding in the presence of timing errors for NRZ signaling
Kinard, Barbara Kay
1990-01-01T23:59:59.000Z
SEQUENCE DECODING IN THE PRESENCE OF TIMING ERRORS FOR NRZ SIGNALING A Thesis by BARBARA KAY KINARD Submitted to the Office of Graduate Studies of Texas ARM University in partial fulfillment of the requirements for the degree of MASTER... OF SCIENCE August 1990 Major Subject: Electrical Engineering SEQUENC'E DECODING IN THE PRESENCE OF TIMIVG ERRORS FOR NRZ SIGNALING A Thesis by BARBARA I&AY KINARD Approved as to style and content by: ostas N. Georg iades (C'hair of C'ommittee) i...
Dual-axis hole-drilling ESPI residual stress measurements
Steinzig, Michael [Los Alamos National Laboratory; Schajer, Gary [UNIV OF BRITISH COLUMBIA
2008-01-01T23:59:59.000Z
A novel dual-axis ESPI hole-drilling residual stress measurement method is presented. The method enables the evaluation of all the in-plane normal stress components with similar response to measurement errors, significantly lower than with single-axis measurements. A numerical method is described that takes advantage of, and compactly handles, the additional optical data that are available from the second measurement axis. Experimental tests were conducted on a calibrated specimen to demonstrate the proposed method, and the results supported theoretical expectations.
Norton, David Jerry
1963-01-01T23:59:59.000Z
ower load =0 40 b 0 p 9 -4. I 4. 2 4 ~ compreSSlo n r a?o FI 6 I 2, EFFI'C I ENC Y II S. COMPRESSION RATIO 17 Fig. 13. Schematic drawing of the mechanical system. The equation of motion for this familiar system is, ~ I NX + C(X-Y) + K(X-Y) = F...
Measurement of MW+ - MW- at LHC
F. Fayette; M. W. Krasny; W. Placzek; A. Siodmok
2009-06-17T23:59:59.000Z
This paper is the second of the series of papers proposing dedicated strategies for precision measurements of the Standard Model parameters at the LHC. The common feature of these strategies is their robustness with respect to the systematic measurement and modeling error sources. Their impact on the precision of the measured parameters is reduced using dedicated observables and dedicated measurement procedures which exploit flexibilities of the collider and detector running modes. In the present paper we focus our attention on the measurement of the charge asymmetry of the W-boson mass. This measurement is of primordial importance for the LHC experimental program, both as a direct test of the charge-sign-independent coupling of the W-bosons to the matter particles and as a necessary first step towards the precision measurement of the charge-averaged W-boson mass. We propose and evaluate the LHC-specific strategy to measure the mass difference between the positively and negatively charged W-bosons, MW+ - MW-. We show that its present precision can be improved at the LHC by a factor of 20. We argue that such a precision is beyond the reach of the standard measurement and calibration methods imported to the LHC from the Tevatron program.
Needs and challenges in precision wear measurement
Blau, P.J.
1996-01-10T23:59:59.000Z
Accurate, precise wear measurements are a key element in solving both current wear problems and in basic wear research. Applications range from assessing durability of micro-scale components to accurate screening of surface treatments and thin solid films. Need to distinguish small differences in wear tate presents formidable problems to those who are developing new materials and surface treatments. Methods for measuring wear in ASTM standard test methods are discussed. Errors in using alterate methods of wear measurement on the same test specimen are also described. Human judgemental factors are a concern in common methods for wear measurement, and an experiment involving measurement of a wear scar by ten different people is described. Precision in wear measurement is limited both by the capabilities of the measuring instruments and by the nonuniformity of the wear process. A method of measuring wear using nano-scale indentations is discussed. Current and future prospects for incorporating advanced, higher-precision wear measurement methods into standards are considered.
Results of performance testing the Russian RPV temperature measurement probe used for annealing
Nakos, J.T. [Sandia National Labs., Albuquerque, NM (United States); Selsky, S. [CNIITMASH, Moscow (Russian Federation)
1998-03-01T23:59:59.000Z
This paper provides information on three (3) topics related to temperature measurements in an annealing procedure: (1) results of a series of experiments performed by CNIITMASH of the Russian consortium MOHT on their reactor pressure vessel (RPV) temperature measurement probe, (2) a discussion regarding uncertainties and errors in RPV temperature measurements, and (3) predictions from a thermal model of a spherical RPV temperature measurement probe. MOHT teamed with MPR Associates and was to perform the Annealing Demonstration Project (ADP) on behalf of the US Department of Energy, ESEERCo, EPRI, CRIEPI, Framatome, and Consumers Power Co. at the Midland plant. Experimental results show that the CNIITMASH probe errors are a maximum of about 27 C (49 F) during a 15 C/hr (27 F/hr) heat-up but only about 3 C (5.4 F) (0.6%) during the hold portion at 470 C (878 F). These errors are much smaller than those obtained from a similar series of experiments performed by Sandia National Laboratories (Sandia). The discussion about uncertainties and errors shows that results presented as a temperature difference provides a measure of the probe error. Qualitative agreement is shown between the model predictions, the experimental results of the CNIITMASH probe and the experimental results of a series of similar experiments performed by Sandia.
Cooper, S.E. [Science Application International Corp., Reston, VA (United States); Wreathall, J. [John Wreathall & Co., Dublin, OH (United States); Thompson, C.M., Drouin, M. [Nuclear Regulatory Commission, Washington, DC (United States); Bley, D.C. [Buttonwood Consulting, Inc., Oakton, VA (United States)
1996-10-01T23:59:59.000Z
This paper describes the knowledge base for the application of the new human reliability analysis (HRA) method, a ``A Technique for Human Error Analysis`` (ATHEANA). Since application of ATHEANA requires the identification of previously unmodeled human failure events, especially errors of commission, and associated error-forcing contexts (i.e., combinations of plant conditions and performance shaping factors), this knowledge base is an essential aid for the HRA analyst.
estimators [1] and for general energy management systems. II. NON-COLLOCATED VOLTAGE AND CURRENT MEASUREMENTS River Project (SRP), Phoenix, AZ. Authors Mann and Heydt are with the Department of Electrical Engineer, complex power measurement. I. INTRODUCTION OWER system measurements may possess error due to inherent
PLL On-Chip Jitter Measurement: Analysis and Design Socrates D. Vamvakos1
Nikolic, Borivoje
PLL On-Chip Jitter Measurement: Analysis and Design Socrates D. Vamvakos1 , Vladimir Stojanovi 2, CA,2 MIT, Cambridge, MA,3 Rambus Inc., Los Altos, CA Abstract Analysis of on-chip jitter measurements based on the dead-zone method reveals potentially large errors in the jitter variance estimate, when
An estimation algorithm for 3-D pose measurement using redundant ultrasonic sensors
Branum, Brian Howell
1998-01-01T23:59:59.000Z
precise precise but expensive sensing equipment to attain range measuring instruments to triangulate an accurate 3-D more sensors than are necessary for a single 3-D pose measurement. If the pose by including expected errors could be modeled with a...
An estimation algorithm for 3-D pose measurement using redundant ultrasonic sensors
Branum, Brian Howell
1998-01-01T23:59:59.000Z
precise precise but expensive sensing equipment to attain range measuring instruments to triangulate an accurate 3-D more sensors than are necessary for a single 3-D pose measurement. If the pose by including expected errors could be modeled with a...
Assessor Training Measurement Uncertainty
NVLAP Assessor Training Measurement Uncertainty #12;Assessor Training 2009: Measurement Uncertainty Training 2009: Measurement Uncertainty 3 Measurement Uncertainty ·Calibration and testing labs performing Training 2009: Measurement Uncertainty 4 Measurement Uncertainty ·When the nature of the test precludes
Steven M Taylor
2007-04-10T23:59:59.000Z
Systematic error in calculation of z for high redshift type Ia supernovae could help explain unexpected luminosity values that indicate an accelerating rate of expansion of the universe.
Back-and-forth Operation of State Observers and Norm Estimation of Estimation Error
Back-and-forth Operation of State Observers and Norm Estimation of Estimation Error Hyungbo Shim with the plant, this paper proposes a state estimation algorithm that executes Luenberger observers in a back in the past have employed time-varying gains to over- come this problem [1], where the basic idea is to obtain
The Influence of Source and Cost of Information Access on Correct and Errorful Interactive Behavior
Gray, Wayne
USA +1 703 993 1357 gray@gmu.edu ABSTRACT Routine interactive behavior reveals patterns of interactionThe Influence of Source and Cost of Information Access on Correct and Errorful Interactive Behavior Wayne D. Gray & Wai-Tat Fu Human Factors & Applied Cognition George Mason University Fairfax, VA 22030
Leaky LMS AlgorithmLeaky LMS Algorithm Convergence of tap-weight error modes dependent on
Santhanam, Balu
Leaky LMS AlgorithmLeaky LMS Algorithm Convergence of tap-weight error modes dependent. Stability and convergence time issues of concern for ill- conditioned inputs. Leaky LMS AlgorithmLeaky LMS cost. Block LMS AlgorithmBlock LMS Algorithm Uses type-I polyphase components of the input u[n]: Block
Publish/Subscribe Systems on Node and Link Error-Prone
tower Cellular W ireless LA N #12;Motivations Mobile environments are error prone Â· Wireless link Â· Comparison pub/sub to client- server and polling models ES EBS ES/ ED Radio tower ES Cellular Wireless Node (,T) (cost of periodic publish or polling) s(n) (effect of sharing among n subscribers) tps (time
Signal Prvcessing An AlgebraicMethod for Compensatingfor Coil-Placement Errors in Three-
MacLean, W. James
), and then expressing eye position as a function of coil position. The coil position vectors can be used to form a rigid coils used - the first employs a secondary coil in the front coil which is effectively woundSignal Prvcessing An AlgebraicMethod for Compensatingfor Coil-Placement Errors in Three
Zollanvari, Amin
2012-02-14T23:59:59.000Z
formulation of the joint distribution of the true error of misclassification and two of its commonly used estimators, resubstitution and leave-one-out, as well as their marginal and mixed moments, in the context of the Linear Discriminant Analysis (LDA...
Error Bounds from Extra-Precise Iterative JAMES DEMMEL, YOZO HIDA, and WILLIAM KAHAN
Li, Xiaoye Sherry
prevented its adoption in standard subroutine libraries like LAPACK: (1) There was no standard way to access error bound for the computed solution. The completion of the new BLAS Technical Forum Standard has was supported in part by the NSF Cooperative Agreement No. ACI-9619020; NSF Grant Nos. ACI-9813362 and CCF
Smoothing Parameter Selection When Errors are Correlated and Application to Ozone Data
Heckman, Nancy E.
Smoothing Parameter Selection When Errors are Correlated and Application to Ozone Data by Robert Jr trend of daily and monthly ground ozone levels in southern Ontario. iii #12; Contents Abstract ii.2 Air Pollution Data . . . . . . . . . . . . . . . . . . . . . . . . 79 5.2.1 Daily Ozone Data . . . . . . . . . . . . . . . . . . .
Error growth in poor ECMWF forecasts over the contiguous United States
Modlin, Norman Ray
1993-01-01T23:59:59.000Z
are found to have the majority of RMS growth on day I while poor forecasts do not experience rapid error growth until days 3 and 4. For poor forecasts, the leading EOFs reveal a wave pattern down stream of the Rocky Mountains. This pattern evolves...