Draw TRBAC who haves time constraint control pattern, and uniting the practice put up the system access control based on characters.

引入含有时间约束的TRBAC控制模型，结合实践构筑了系统的基于角色的访问控制。

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Synthesizes main models of role - based aceros control and designs a time role - based access control model which is called TRBAC model.

在基于角色访问控制的几种主要模型的基础上，提出了一种基于时间的角色访问控制模型。

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