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In the last years, wireless sensor networks (WSNs) are acquiring
more importance as a promising technology based on tiny devices
called sensor nodes or motes able to monitor a wide range of
physical phenomenon through sensors. The severe hardware
restrictions of sensor nodes in relation to computation,
communication and specifically, energy, have posed new technical
and conceptual challenges. In particular, research is moving
towards heterogeneous networks that will contain different devices
running custom WSN operating systems. Operating systems
specifically designed for sensor nodes are intended to efficiently
manage the hardware resources and facilitate the programming.
Nevertheless, they often lack the generality and the high-level
abstractions expected at this abstraction layer. The book address
the problem of designing and implementing a generic sensor
node-centric architecture distinguishing clearly the different
abstraction levels in a sensor node. Programming language
extensions have to be also specified on top of the architecture, in
order to write portable applications. In this way, architecture
deals with the problem of heterogeneity and portability.
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