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Sensor networks are typically wireless networks composed of resource-constrained battery powered devices. In this paper, the authors present a criterion for determining whether or not a surveillance sensor network is viable. They use this criterion to compare methods for extending the effective lifetime of the sensor network. The life extension methods they consider are local adaptations that reduce the energy drain on individual nodes. They are communications range management, node repositioning, and data agreement. Simulations of a surveillance scenario quantify the utility of these methods. Their results indicate that data agreement provides the most improvement in network longevity, and communications range management is also useful.
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