Temporal constraints are introduced in the user assignment and permission assignment to express and realize more powerful access control semantics.

在用户分配和权限分配中引入时间约束，表示和实现了更为丰富的访问控制语义。

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Based on RBAC model, this paper introduces negative authorization into the user assignment and permission assignment, and discusses their realizing approaches and features.

本文在RBAC模型基础上，分别在用户分配和权限分配中引入了负授权，讨论了负授权的实现方式及其特点。

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But the traditional RBAC model doesnot give the method to control the role assignment and it cannot assure the least priority of the role's permission.

但传统的RBAC模型既没有给出控制角色指派的方法，也不能保证角色许可最少优先原则。

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Given the state of the newspaper business these days, it's unlikely anyone will get permission to spend 100 grand on a similar assignment ever again even at the Enquirer.

ECONOMIST: Business travel