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Barrier coverage is attractive for many practical applications of wireless sensor networks. In stationary networks, if the number of deployed sensors is not large enough, the intruder may pass though the barrier gaps undetected. Recently, using mobile sensors to repair gaps and improve network barrier coverage performance has attracted much attention. We focus on constructing energy efficient strong...
Emptiness checking is a key operation in the automata-theoretic model checking approach to LTL verification. Explicit state model checkers typically construct the automata on-the-fly and explore their states using depth-first search (DFS). We first cover the fundamentals of emptiness checking and summarize two important emptiness checking theorems for deciding the product automata nonempty. We then...
For topic distillation and topic exploration, a rich resource is the information from hyper linked Web pages. The anchor text, an objective summary of Web pages, is of strong topic and semantic indication. As to the triangular relationship of the hub Web page, anchor text, and authoritative Web page, a good hub Web page is the one that is directed to a good authoritative Web page through the authoritative...
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