pcm level 中文意思是什麼
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Pcm transmitter is the key part of reentry telemetry system and its level influences the development of the entire system
Pcm發射機是再入遙測設備的核心部件，它的發展水平直接影響再入遙測系統的發展。 -
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
本文主要研究開發高安全等級的操作系統所必需的安全策略形式模型，為此我們從形式設計方法的探討入手，確定模型設計的基本原則及組織結構，然後根據確定的組織結構逐步展開設計，提出支持多策略的形式框架、實現機密性策略的可動態調節安全級范圍的多級安全模型dmlr _ mls （本文把它與dac模型合在一起形成dblp模型） 、基於dte技術實現完整性保護的形式模型dte _ ipm及基於權能、角色及dte的特權控制模型pcm _ rbpc 。
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