Introduced the outer role, inner role and basic role, the model can not only realize Discretionary Access Control but also the Mandatory Access Control. In addition, it can facilitate the management.

引入了外部角色、内部角色和基本角色，使得该模型可以同时实现自主访问控制和强制访问控制，而且也方便了管理。

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This paper analyzes the characteristics of Spacecraft Fault Diagnosis System and the basic idea and principle of Role-Based Access Control model.

文章介绍了基于角色的权限管理模型的基本思想及工作原理，并分析了航天器故障诊断系统中权限管理的特征。

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This paper introduces the basic concept and model of access security control of the database system in a multiuser information system. It also describes its concrete implementation.

本文介绍了多用户信息系统中数据库的安全性控制的基本概念及控制模型，以及在多用户信息系统中安全性控制的实现方法。

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