系统中GRBAC使用的属性值来计算的安全性 等级，并延长GRBAC。我们期望这种模式被广泛 用于提供灵活的安全服务在异构 网络。-The system uses attribute values in GRBAC to calculate the Security Level, and extend the GRBAC. We expect this model to be widely used in providing flexible security servic