Through introducing the concept of resource into the traditional RBAC model, a databased-based fine grain RBAC control is implemented.
提出将资源概念引入传统RBAC模型中，实现一种基于数据库的动态细粒度rbac控制。
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It is based on a database of past PDC bits. In the databased, it includes bit type, average shear stress of well which bit was used in, cost per unit length.