在基于角色的委托模型中，委托被看作是一种特殊的URA过程。
In a role based delegation model, delegation is seen as a special URA course.
基于角色的委托授权模型旨在解决传统授权管理的集中性和复杂性问题，从而满足分布式计算环境的需求。
Role-Based Delegation Model mainly solves the centralization and complexity questions of traditional authorization management, and satisfies the requirement of distributed computing environment.
针对实际应用中对委托限制多方面需求的实际，在已有工作的基础上，提出了基于层次角色的受限委托模型HRRDM。
To satisfy various restricted delegation requirements of actual applications, on the basis of the existing works, a Hierarchical Role-based restricted delegation Model (HRRDM) was proposed.
针对实际应用中对委托限制多方面需求的实际，在已有工作的基础上，提出了基于层次角色的受限委托模型HRRDM。
To satisfy various restricted delegation requirements of actual applications, on the basis of the existing works, a Hierarchical Role-based restricted delegation Model (HRRDM) was proposed.
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