And, the expanded RBAC model-ERBAC model and the formal description are given.
给出了扩展的RBAC模型—ERBAC模型，并给出了其形式化描述。
ERBAC model is composed of three parts: system component, database and human-machine interface.
ERBAC模型的实现主要包括系统组件、数据库和人机界面三部分。
This paper first describes the ERBAC mainframe of the management of authorization, and then gives the formal rules that ERBAC model must meet.
给出了ERBAC的动态授权管理框架，最后用形式化语言描述了ERBAC模型满足的规则。
It also combines dispatching business in public traffic enterprises and RBAC model, localized the latter one, and then put forward the ERBAC model which meets the systematic demand.
将公交企业具体的调度业务与RBAC模型思想结合，对RBAC模型进行了本地化改造，提出了适合系统需求的ERBAC模型。
At last several improved Suggestions are proposed to the ERBAC model, an improved model is built. and its effective application and implementation in a large-scale system are introduced.
最后对ERBAC模型提出改良意见，建立了改良模型；并介绍其在某大型系统中的有效应用和实现。
At last several improved Suggestions are proposed to the ERBAC model, an improved model is built. and its effective application and implementation in a large-scale system are introduced.
最后对ERBAC模型提出改良意见，建立了改良模型；并介绍其在某大型系统中的有效应用和实现。
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