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16 IEEE Instrumentation & Measurement Magazine April 2009 1094-6969/09/$25.002009IEEE

Summary: 16 IEEE Instrumentation & Measurement Magazine April 2009
he energy problem in wireless sensor networks re-
mains one of the major barriers preventing the com-
plete exploitation of this technology. Sensor nodes
are typically powered by batteries with a limited lifetime, and
even when additional energy can be harvested from the exter-
nal environment, it remains a limited resource to be consumed
judiciously. Efficient energy management is thus a key require-
ment, with most strategies assuming that data acquisition con-
sumes significantly less energy than data transmission. When
this assumption does not hold, effective energy management
strategies should include policies for an efficient use of energy-
hungry sensors.
A wireless sensor network (WSN) consists of a large number
of tiny sensor nodes deployed over a geographical area, also
referred to as a sensing field; each node is a low-power device
that integrates computing, wireless communication, and


Source: Alippi, Cesare - Dipartimento di Elettronica e Informazione, Politecnico di Milano


Collections: Computer Technologies and Information Sciences