Ungjin Jang

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In order to gather sensor data, a data gathering tree is commonly created as a subnetwork of a wireless sensor network. Power conservation is of paramount importance in such networks, and using periodic sleep–wake cycles for sensor nodes is one of the most effective methods for power conservation. This paper addresses the problem of scheduling the(More)
A wireless sensor network (WSN) typically consists of a large number of small-sized devices that have very low computational capability, small amounts of memory and the need to conserve energy as much as possible (most commonly by entering suspended mode for extended periods of time). Previous approaches for WSN time synchronization do not satisfactorily(More)
Given a dense Wireless Sensor Network satisfying k-coverage, it is useful to be able to identify those nodes that can be turned off while still maintaining k-coverage. Since this is an NP-hard problem, this paper proposes a heuristic algorithm that iteratively selects a node with the highest current "coverage level," turns that node off, and repeats until(More)
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