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Fueled by the increasing capability and decreasing cost of computing and communication devices, Wireless Sensor Networks (WSNs) hold the promise of revolutionizing a wide range of application domains such as machine failure diagnosis, pollutant detection, medical emergency response, and supply chain management. Irrespective of the domain-specific characteristics of various applications, data gathering remains the primary service provided by wireless sensor networks. A data gathering WSN in general consists of one or more sinks, which subscribe to specific data streams by expressing interests or queries, and many sensors, which act as sources that detect environmental events or local states and push the relevant data to the subscriber sinks.
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