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Issue No.05 - May (2010 vol.22)
pp: 711-729
Tao-Yang Fu , National Chiao Tung University, Hsinchu
Wen-Chih Peng , National Chiao Tung University, Hsinchu
Wang-Chien Lee , Pennsylvania State University, Pennsylvania
Wireless sensor networks have been proposed for facilitating various monitoring applications (e.g., environmental monitoring and military surveillance) over a wide geographical region. In these applications, spatial queries that collect data from wireless sensor networks play an important role. One such query is the K-Nearest Neighbor (KNN) query that facilitates collection of sensor data samples based on a given query location and the number of samples specified (i.e., K). Recently, itinerary-based KNN query processing techniques, which propagate queries and collect data along a predetermined itinerary, have been developed. Prior studies demonstrate that itinerary-based KNN query processing algorithms are able to achieve better energy efficiency than other existing algorithms developed upon tree-based network infrastructures. However, how to derive itineraries for KNN query based on different performance requirements remains a challenging problem. In this paper, we propose a Parallel Concentric-circle Itinerary-based KNN (PCIKNN) query processing technique that derives different itineraries by optimizing either query latency or energy consumption. The performance of PCIKNN is analyzed mathematically and evaluated through extensive experiments. Experimental results show that PCIKNN outperforms the state-of-the-art techniques.
K-Nearest neighbor query, wireless sensor networks.
Tao-Yang Fu, Wen-Chih Peng, Wang-Chien Lee, "Parallelizing Itinerary-Based KNN Query Processing in Wireless Sensor Networks", IEEE Transactions on Knowledge & Data Engineering, vol.22, no. 5, pp. 711-729, May 2010, doi:10.1109/TKDE.2009.146
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