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Consider a wireless sensor network where each node has K radios r1,r2, ⋯ , rK such that the one hop reachability distance (resp. energy expended) of (resp. by) radio ri is greater than that of rj 1 ≤ j <; i ≤ K. Given such a network, the problem of energy efficient radio activation is to minimize the total energy spent by the active radios across all nodes in order to maintain a connected network...
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