Design and implementation of a Witness Unit for opportunistic routing in tsunami alert scenarios

摘要: Abstract Some earthquakes generate tsunamis in the ocean or coastal regions. An early alert is essential for population to prevent loss of human life. The propagation made through a range communication means: radio, television, sirens, landlines and cell phones, social media including Twitter, and, if electrical power communications utilities are blacked-out, an alternative opportunistic network. In this article, special device, named Witness Unit (WU), designed work with satellite network presented as means temporarily degraded disaster environment. A greedy heuristic algorithm placement deployment WUs introduced its interaction emergency managers citizens discussed.