The function, structure and its component were discussed by combined function analysis and process decomposition approach.
笔者采用组合功能分析和过程分解的方法，对城市公共安全系统的功能、结构和组成进行了讨论；
This paper suggests a recursive decomposition form of system reliability structure function and establishes a recursive decomposition method for large-scale network seismic reliability analysis.
提出了系统结构函数的递推分解格式，建立了网络抗震可靠度的递推分解算法。
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