本文基于安全策略的分层管理模型，提出了一个集目标求精和实体求精为一体的安全策略逐级求精算法。
Integrated with goal refinement method and entity refinement method, an algorithm of policy refinement is proposed in this paper on the basis of layered-policy model for security policy.
幸运的是，会员与角色管理都建立在一个分层模型上，如Figure 8所示。
Fortunately, both the Membership and Role Manager systems are built on a layered model that I've shown in Figure 8.
设计了一个基于分层模型的校园网格资源管理模型，包括应用支持层，服务层和资源层。
A campus grid resource management model based on Hierarchical model is designed, which includes Application Support Layer, Service Layer and resource Layer.
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