The contradiction between performance and cost has now became more and more severe during the evolution of wireless communication technology. The radio spectrum scarcity and the inefficiency of stationary spectrum allocation strategy is one of the critical problems which requiring a more effective utilization of spectrum resources. Cognitive radio technology is a brand new solution
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With the rapid development of World Wide Web, the prevalent availability of various digital equipments, and ever-growing improvement of large-scale storages, we have witnessed the explosive growth in the amount and complexity of image data. Micro digital images form the basis of many applications, like entertainment, commerce, education and so on, bing many image databases
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Optimal tree decomposition is one of basic problems in the research about Bayesian networks beacause it is closely related to both theoretical and practical aspects about Bayesian networks, and it occupies an important position in theory of computation. According to three different optimization goals:minimum width, minimum weighted width and minimum state space size of join
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