用户组是个接触其它自由职业者、扩展人际网络的好地方。
A user group is a good place to meet other freelancers and to extend your network.
AIX V7.1提供用户组扩展能力，以及新的密码策略和对OD m目录的访问限制等安全改进。
AIX V7.1 provides user group scalability and security enhancements such as new password policies and access restriction to ODM directories.
在RBAC模型的基础上引入用户组、角色组的概念，从用户、角色和权限三个方面对R BAC模型进行了扩展。
Based on RBAC model, the paper adds user group, role group to extend the model from user, role and permission.
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