通过对供应链的系统分析，归纳总结了供应链的基本结构模型，并分析了其可靠性的特征量。
Through a systematical analysis of supply chains, their basic structure models are summarized, and the characteristic quantities of their reliability are analyzed.
最后结合具体实例，运用所建立的模型进行安全评价，采用安全等级模糊特征量确定应用实例的安全等级。
Finally, combining the concrete example, USES this established model to safety evaluate, and adopts the fuzzy characteristic vector of safety grade to confirm the security grade.
本文简介了丰度模型、齐波夫律、特征分析、信息量与隶属函数等方法，并对其中某些方法有所改进。
In this paper, several methods such as abundance pattern, Zipf's Law, characteristic analysis, information content and subordinate function are briefly introduced and Some of them are improved.
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