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     The Role of the Media
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     (6) Instance.
     (6)实例验证。
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     The Role of Aesthetics
     美学的角色
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     The second is the instance.
     第二部分为实例部分。
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     Finally, the signification and role of the software for construction organization decision was explicated through an instance.
     最后 ,通过实例说明了开发的仿真软件对施工组织决策的意义和作用。
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  role instance
The person instance in not directly linked with the image, but indirectly through the role instance.
      
This requires the definition of policy templates which have to be instantiated with specific targets for every role instance.
      
Further the role instance must be an instance of the class which is associated with the name in the relationship class.
      
By having a role instance, useful instance information about the role assigned can be maintained.
      


The role-based access control (RBAC) is an authorization access control mode applied widely. 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. During to the limitations of thetraditional RBAC system, this article introduces the conception of users’ reliability and roles instance to bring forward a dynamic RBAC modelconsidering the users’ reliability, It also gives the executing process...

The role-based access control (RBAC) is an authorization access control mode applied widely. 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. During to the limitations of thetraditional RBAC system, this article introduces the conception of users’ reliability and roles instance to bring forward a dynamic RBAC modelconsidering the users’ reliability, It also gives the executing process of the model.

基于角色的访问控制(RBAC)是一种广泛应用的授权访问控制方式。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。该文针对传统RBAC系统中存在的上述缺陷,通过引入用户可信度和角色实例的概念,提出了一种考虑用户可信度的动态RBAC模型,给出了模型执行过程。

 
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