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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/50515

    Title: On Connected Target Coverage for Wireless Heterogeneous Sensor Networks with Multiple Sensing Units
    Authors: 石貴平;Shih, Kuei-ping;Deng, Der-jiunn;Chang, Ruay-shiung;Chen, Hung-chang
    Contributors: 淡江大學資訊工程系
    Keywords: connectivity;heterogeneous sensors;multiple sensing units;target coverage;wireless sensor networks
    Date: 2009-01-01
    Issue Date: 2010-08-09 18:52:20 (UTC+8)
    Publisher: Molecular Diversity Preservation International (MDPI)
    Abstract: The paper considers the connected target coverage (CTC) problem in wireless heterogeneous sensor networks (WHSNs) with multiple sensing units, termed MU-CTC problem. MU-CTC problem can be reduced to a connected set cover problem and further formulated as an integer linear programming (ILP) problem. However, the ILP problem is an NP-complete problem. Therefore, two distributed heuristic schemes, REFS (remaining energy first scheme) and EEFS (energy efficiency first scheme), are proposed. In REFS, each sensor considers its remaining energy and its neighbors’ decisions to enable its sensing units and communication unit such that all targets can be covered for the required attributes and the sensed data can be delivered to the sink. The advantages of REFS are its simplicity and reduced communication overhead. However, to utilize sensors’ energy efficiently, EEFS is proposed. A sensor in EEFS considers its contribution to the coverage and the connectivity to make a better decision. To our best knowledge, this paper is the first to consider target coverage and connectivity jointly for WHSNs with multiple sensing units. Simulation results show that REFS and EEFS can both prolong the network lifetime effectively. EEFS outperforms REFS in network lifetime, but REFS is simpler.
    Relation: Sensors 9(7), pp.5173-5200
    DOI: 10.3390/s90705173
    Appears in Collections:[Graduate Institute & Department of Computer Science and Information Engineering] Journal Article

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