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A Wireless Sensor Network (WSN) consists of a large number of tiny, low-powered devices, called sensors, which communicate with each other (possibly) in a multi-hop fashion. These sensors suffer from severe constraints, such as low reliability and limited battery power (or energy), processing power, storage memory, sensing range and communication range capabilities, to name a few, with energy being the most critical one. Tremendous advances in inexpensive sensor technology and wireless communications have rendered the design and development of large-scale wireless sensor networks cost effective and viable enough to attract the attention of a wide range of civilian, natural, and military applications.
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