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Distributed systems, such as peer-to-peer systems, computing grids across multiple organizations, and compositional Web services require a rethinking of basic issues in their design and implementation, especially in access control mechanism. This paper establishes a model of access control in distributed systems named as policy domain access control model. We firstly give definitions of policy, credential...
The tasks scheduling model is established based on multi-factors that include communication abilities between any two sites, process ability of the site and the reliability of site in complex and dynamic environment. The Target heuristic function is constructed combined minimum executing time and reliability of site. Simulation result demonstrates the factors concern with task scheduling model accord...
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