According to the openness of process planning knowledge base, this paper proposes a hierarchy knowledge base model based on open structure.

根据工艺设计知识库的开放性要求，提出了一个基于开放式结构的层次化知识库模型。

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To raise the efficiency of the fuzzy knowledge base of the expert system, the architecture for fuzzy knowledge base model is built in this paper.

为了提高专家系统模糊知识库的效率，建立了一种专家系统模糊知识库的结构模型。

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From the decision table defined by history fault data, we reduce the decision table in rough set theory and build the knowledge base model of expert system.

该系统从历史故障数据所形成的决策表出发，运用粗糙集理论进行约简，构建专家系统知识库模型。

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