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This paper proposes a VIrtual Scanning Algorithm (VISA), tailored and optimized for road network surveillance. The authors' design uniquely leverages upon the facts that the movement of targets (e.g., vehicles) is confined within roadways and the road network maps are normally known. They guarantee the detection of moving targets before they reach designated protection points (such as temporary base camps), while maximizing the lifetime of the sensor network. The main idea of this paper is virtual scan - waves of sensing activities scheduled for road network protection.
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