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In pervasive computing environments, Location-Based Services (LBSs) are becoming increasingly important due to continuous advances in mobile networks and positioning technologies. Nevertheless, the wide deployment of LBSs can jeopardize the location privacy of mobile users. Consequently, providing safeguards for location privacy of mobile users against being attacked is an important research issue...
In the wireless sensor network with multitype sensors and different sample rates, collecting data in an energy-efficient way is a key issue. In this paper, a group based mobile agent routing (GMAR) protocol is presented. In GMAR, a source node grouping algorithm is designed, dividing sensors that can be sampled at same time in one group. To collect data efficiently, the node visiting sequence is statically...
Because spatial data are usually high-dimensional, complex and mass, we categorize the attributes of each spatial data object as spatial attributes and non-spatial attributes. We use spatial attributes to construct spatial index and determine spatial neighborhood, and use non-spatial attributes to compute outlying degree and spatial outlying degree factor, so as to solve the problem of index and the...
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