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动态多级安全级模型及其应用 被引量:4
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作者 刘尊 安喜锋 李伟华 《计算机工程与应用》 CSCD 北大核心 2009年第14期100-102,共3页
针对采用传统MLS模型实现的系统可用性和灵活性较低的问题,提出了一种基于动态安全级的MLS模型Dynamic MLS。模型使用由流入信息最高安全级和流出信息最低安全级组成的动态安全级代替传统BLP模型中的当前安全级,并依此对主体访问客体的... 针对采用传统MLS模型实现的系统可用性和灵活性较低的问题,提出了一种基于动态安全级的MLS模型Dynamic MLS。模型使用由流入信息最高安全级和流出信息最低安全级组成的动态安全级代替传统BLP模型中的当前安全级,并依此对主体访问客体的行为进行更灵活的控制。模型在BLP模型11条规则的基础上对其中的5条规则进行了改进,并通过形式化方法证明了改进模型的正确性。最后给出了模型在增加linux系统安全性方面的应用。 展开更多
关键词 多级安全性(MLS) 安全模型 动态安全级
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Application of dynamic programming to structural repairing strategies
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作者 陈朝晖 LIU +1 位作者 Xila 《Journal of Chongqing University》 CAS 2002年第2期34-37,共4页
A model of dynamic programming for repairing strategies of concrete structures during a projected service period is proposed, which takes into account the degradation in strength of components and the probability of a... A model of dynamic programming for repairing strategies of concrete structures during a projected service period is proposed, which takes into account the degradation in strength of components and the probability of accidental load. This model takes the safety grade of a structural system as the state variable of repairing strategies, and incorporates economic factors including expected repair cost, property loss due to structure failure, goods and material loss due to structure failure, loss of production interrupt due to structure failure, and inspection cost in decision making. It is found that the optimal repairing strategies are sensitive to the probability of accidental loads as well as the failure costs. The practicality of the model is demonstrated by an example. 展开更多
关键词 structural reliability safety classification repairing strategies
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