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Recent years have witnessed an increasing need for wireless sensor networks in a wide range of applications especially for buildings' automation. In such networks, many sensor nodes relay the sensed data hop by hop towards the nearest sink. The sensors closest to the sinks drain their energy much faster than distant nodes because they carry heavier traffic which causes prematurely the end of the network lifetime. Relocating the sinks can solve this problem by distributing the high traffic load among the sensors and increase the network lifetime.
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