Disasters o?en result in a tremendous cost to our society. Previously, wireless sensor networks have been proposed to provide\r\ninformation for decision making in postdisaster relief operations. ?e existing WSN solutions for postdisaster operations normally\r\nassume that the deployed sensor network can tolerate the damage caused by disasters and maintain its connectivity and coverage,\r\neven though a signi??cant portion of nodes have been physically destroyed. Inspired by the ââ?¬Å?blackboxââ?¬Â technique, we propose that\r\npreserving ââ?¬Å?the last snapshotââ?¬Â of the whole network and transferring those data to a safe zone would be the most logical approach to\r\nprovide necessary information for rescuing lives and control damages. In this paper, we introduce data evacuation (DE), an original\r\nidea that takes advantage of the survival time of the WSN, that is, the gap from the time when the disaster hits and the time when\r\nthe WSN is paralyzed, to transmit critical data to sensor nodes in the safe zone. Numerical investigations reveal the effectiveness of\r\nour proposed DE algorithm.
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