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By the method of synchronization coefficient, using the indicator of slaughtered fattened hogs, this paper makes a calculation on the synchronization of hogs production fluctuation in China and its regions from 1980 to 2008. The results show that: (1) the mean value of synchronization coefficient between regions and the whole nation is 0.8988. And the synchronization coefficient of the central south...
The access control service has been an important orientation in the security research. In this paper, the essentiality of access control service in the E-Commerce Web was analyzed; the relative technologies were introduced at the same time. And through describing a concrete collaborative e-commerce platform, a detailed description of how to design and implementation of access control systems were...
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