参考借鉴了故障树分析和因果图，对顾客投诉根本原因分析方法提出了整体设计。

Fault tree analysis and cause-effect diagram as reference, the root cause analysis method on the customer complaint is designed.

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结果表明因果图方法可以有效地进行安全分析和安全评估，而且比故障树分析法效果好。

Its result indicates that causality diagram is more effective than FTA in security analysis and assessment.

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利用二元决策图(BDD)中的B—割集和节点概率，提出了基于BDD的关联故障树定量分析新算法。

By the B-cut sets and the probabilities of the nodes of Binary Decision Diagrams (BDD), a new quantitative analysis algorithm of coherent fault tree based on BDD is presented in this paper.

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