Grouping mechanism that evaluates to true if expressions contained inside evaluate to 如果内部包含的表达式的计算结果为
Principle and dimension comprehensive method of a kind of new cam - link grouping mechanism 一种新型内凸轮连杆组合机构的原理与尺度综合
Rcbac model introduces the context information and the group mechanism to the access control policies . in rcbac , the context information is used to control the user assignment and permission assignment dynamically and the group mechanism is used to simplify authorization further . thus , rcbac can implement the fine - grained access control and satisfy the enterprise ’ s demand for the unified resource access control 在对rbac的一些改进模型分析研究的基础之上提出了基于角色和上下文的访问控制模型( roleandcontext - basedaccesscontrol , rcbac ) , rcbac模型将上下文信息和组化机制引入到访问控制策略中,利用上下文信息动态地控制用户分配和权限分配,利用组化机制进一步简化授权,实现了细粒度的访问控制,满足了企业统一资源访问控制的需求。
Based on analyzing the achievement ' s foundation of country ' s enterprises development in our country , it is pointed out the problems of country ' s enterprises in developmental process , and it is put forwards reorganization mechanism and optimizing countermeasures of country ' s enterprises spatial development which evaluating industry guide , constituting reorganization policies , constructing groups mechanism , actualizing spatial reorganization and pushing rural urbanization 摘要在深入分析我国乡镇企业发展成就的基础上,指出其中存在的问题,并提出生态脆弱区乡镇企业空间重组机制和重组对策:进行产业导向评价,制定重组政策,建构企业簇群,实施空间重组,有序推进农村地区城镇化。