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	author          = {R. Kosar and I.Bojaxhiu and E. Onur and C. Ersoy},
	title           = {Lifetime extension for surveillance wireless sensor networks with
	intelligent redeployment},
	journal         = {J. Netw. Comput. Appl.},
	year            = {2011},
	month           = {November},
	volume          = {34},
	number          = {6},
	pages           = {1784--1793},
	issn            = {1084-8045},
	abstract        = {For wireless sensor networks (WSNs), uneven energy consumption is
	a major problem. A direct consequence of this is the energy hole
	problem, formation of sensing voids within the network field due
	to battery depleted sensors in the corresponding region. Hole formations
	are inherent in the network topology, yet it is possible to develop
	strategies to delay the hole formations to later stages of the network
	operation and essentially extend the network lifetime without sensing
	quality loss. In this work, we initially propose and analyze an approach
	that can be used to mitigate the hole problem. The approach is presented
	in detail and the effects on the sustained surveillance quality are
	presented. The results are based on simulations with different network
	configurations with realistic sensor models, MAC and routing protocols.
	By using the proposed approach, sustaining a sensing quality above
	a given threshold and more than doubling the network lifetime are
	possible. The results clearly indicate the suitability of the approach
	for especially demanding WSNs such as the ones used for border surveillance