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As new fabrication and integration technologies continue to reduce the cost and size of wireless sensors, the observation and control of the physical world will expand dramatically with the temporally and spatially dense monitoring afforded by wireless sensor network technology. Several applications such as ZebraNet, Counter-sniper system, environment sampling, target tracking, and structure monitoring have been launched, showing the promising future of wide range of applications of networked sensor systems. Their success is nonetheless determined by whether the sensor networks can provide a high quality stream of data over a long period. The inherent feature of unattended and untethered deployment of networked sensors in a potentially malicious environment, however, imposes challenges to the underlying systems.
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