求翻译：OA系统提高了各个部门之间协同工作效率，有效的实现了资源共享。同时，资源共享与信息安全又是一对矛盾体。一方面希望OA系统使工作参与者随时获得各种有用信息，但另一方面，又要求某些信息的访问权限受到保护，防止越权访问或篡改。针对这些情况，本文对OA 系统进行了基于角色的安全访问控制设计。是什么意思？

oa system to improve the synergy between the various departments work efficiency and effective resource sharing. At the same time, resource sharing and information security is a contradiction. On the one hand oa system enables participants ready access to a variety of useful information, but on the

OA system improves efficiency and synergy among the various departments have achieved the effective sharing of resources. In the meantime, sharing of resources and information security is one of contradictions. We hope that the participants OA system ready access to various useful information, but o

The OA system enhanced between each department the joint operation efficiency, effective realization resources sharing.At the same time, resources sharing and the information security also are a pair of contradictory body.On the one hand hoped the OA system causes the work participant to obtain each

OA systems improve the efficiency of the synergy between the various departments, effective realization of resource sharing. At the same time, resource sharing and information security is a contradictory body. One hand want OA system so that participants can get all kinds of useful information, but