leveling ring meaning in Chinese

整平圈

For this , based on analyzing formalized design method , principles and architecture for designing formal model are proposed , then according to them , the model is designed hierarchically . first , a formal framework for supporting multipolicy is presented . second , some component models are constructed , including dynamically mediated security level rang multilevel security model dmlr - mls , which is used to implement confidentiality policy , and renamed as dblp model after it is combined with dac model , based - dte integrity protection security model dte - ipm , and privilege control model pcm - rbpc based on capability mechanism , role mechanism and dte privilege mechanism
本文主要研究开发高安全等级的操作系统所必需的安全策略形式模型，为此我们从形式设计方法的探讨入手，确定模型设计的基本原则及组织结构，然后根据确定的组织结构逐步展开设计，提出支持多策略的形式框架、实现机密性策略的可动态调节安全级范围的多级安全模型dmlr _ mls (本文把它与dac模型合在一起形成dblp模型) 、基于dte技术实现完整性保护的形式模型dte _ ipm及基于权能、角色及dte的特权控制模型pcm _ rbpc 。