Research,improvement and implementation of RBAC model
RBAC模型研究、改进与实现

An improved model was proposed for the deficiencies of traditional RBAC model in role-management such as over complexity and rough granularity. The characteristics of this model were described in detail, in which permission constraint elements and special permissions were introduced. Acting as permission data, other functional modules and their related operations can make the couple of the permission codes and operation logics eliminated. As a conclusion, implementation of this improved model in system of permission management was described in detail, also including its advantages and disadvantages.