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Recently, researches on hierarchical clustering routing protocol in wireless sensor networks have been widely carried on. These protocols mostly are about unique sink node. In large wireless sensor networks the above protocols are not scalable. In this paper, we proposed a multi-level protocol between cluster heads and more sink nodes, which organizes sensor nodes with LEACH clustering algorithm....
The barrier coverage model was proposed for applications in which sensors are deployed for intrusion detection. In this paper, we study a strong barrier coverage problem in wireless sensor networks with directional sensors. First, we introduce the directional coverage graph to model barrier coverage with directional sensors. Based on this graph model, we present an integer linear programming formulation...
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