Based on fault tree analysis (FTA) theory, an object-oriented knowledge representation method in a fault diagnosis expert system for machine tools was studied.

针对所研究的机床故障诊断专家系统，以故障树分析法为基础，采用面向对象的事件知识表示方法。

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The paper describes and develops ontology by object-oriented knowledge representation, hence the representation leads to domain algebra system and agent service description language.

为此，文中用面向对象的知识表示方法描述并建立本体，并以此为基础形成领域操作代数系统和智能体服务描述语言。

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Based on comparing some methods for traditional knowledge representation, this paper introduces the application of object-oriented knowledge representation in a fault diagnosis system.

本文在比较了几种传统的知识表示方法的基础上，介绍了在某故障诊断系统中采用面向对象的知识表示方法的具体应用。

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