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The Wireless Sensor Networks (WSNs) is a power constrained system, since nodes run on limited power batteries which shorten its lifespan. The main challenge facing in the design and conception of Wireless Sensor Networks (WSNs) is to find the best way to extend their life span. The clustering algorithm is a key technique used to increase the scalability and life span of the network in general. In this paper, the authors propose and evaluate a distributed energy-efficient clustering algorithm for WSNs. This heterogeneous-energy protocol is a new clustering algorithm to decrease probability of failure nodes and in which they introduce the node's remaining energy so as to determine the cluster heads. They study the impact of heterogeneity of nodes on WSNs that are hierarchically clustered.
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