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Sensor networks have recently attracted significant attention for many military and civil applications, such as environment monitoring, target tracking, and surveillance. A high-level abstraction of sensor networks forms the distributed database view, in which query is adopted to retrieve data from the network. Continuous query is an important approach that is commonly used for collecting real-time data. Sensor nodes have limited energy resources and their functionality continues until their energy drains. Therefore, query for sensor networks, and especially continuous query, should be wisely designed to extend the lifetime of sensors.
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