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In wireless sensor networks (WSNs), coverage is a key factor of affection the lifetime of networks. In this paper, we study the coverage problem for network which is comprised of mobile sensor nodes with sensing radius r and communication radius R = 2r. For a possible movable redundant sensor, we present a coverage hole detection method (CHDM) by mathematic analysis, and then give a node mobility...
With growing popularity of social networks, people's locations are being used for providing rich mobile social services, mostly with outdoor positioning using GPS. We present a mobile social service deployed in an indoor office environment called “Nokia Find & Connect” (NF&C). In NF&C, employees' locations are tracked using Wi-Fi to efficiently find, reserve and manage office resources...
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