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Advances in microelectronics have enabled the development of exceptionally tiny sensor nodes that have the ability of measuring ambient conditions such as temperature, pressure, humidity, light intensity, and motion (Akyildiz et al. 2002). The sensed data can then be transmitted through an on-board radio transmitter to a single or multiple Base Stations (BSs) where it can be further processed. The tiny size and inexpensive cost of such emerging sensor nodes has encouraged practitioners to explore using them collaboratively in a network formed in ad hoc manner. Such networked sensor system not only is cost-effective but also can provide fast and accurate information gathering in remote and risky areas.
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