以下为句子列表：
英文: To overcome the knowledge representation limitations of the traditional signed digraph model based expert systems for hazard and operability analysis, a novel layered digraph model for automating process hazard and operability analysis is proposed based o
中文: 摘要为克服传统的基于有向图模型的危险和可操作性分析专家系统在知识表达方面的局限性，通过将二维的有向图模型在三维空间的解耦，采用图论的方法，提出了一个可以用于危险和可操作性分析自动化的有向架模型。
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