【作者】 李文杰；

【导师】 冯志勇；

【作者基本信息】 天津大学 ， 计算机应用技术， 2004， 博士

【摘要】 为了使能CAPP领域知识得到最大程度上的共享与复用,本文把本体理念及其相关技术引入到CAPP应用系统中,构造出CAPP系统的领域本体知识库,并用本体理念对该本体知识库中的零件信息进行描述,设计与实现基于领域本体知识库的智能信息检索系统来验证本体知识库的合理性与有效性。把本体理念及其相关技术引入到CAPP应用系统中,并借鉴本体理念在AI等信息系统领域的成功研发经验,在领域专家的参与下,用本体语言DAML+OIL和本体编辑工具Protégé2000来描述与注释CAPP领域中概念、概念的属性以及概念之间关系的语法和语义,从而建立CAPP应用系统在不同抽象级别上的领域本体知识库,并通过层次化树型结构对领域本体知识库进行管理与维护。为了对零件信息进行清晰地表达与描述,在分析零件信息的现有四种表达方式的基础上,通过把本体理念及其相关技术引入到CAPP系统的领域本体知识库中,提出基于本体理念的零件描述模型以及该模型的三层体系架构,并对该体系架构中的零件特征描述模型及其结构进行介绍。通过案例分析结果表明,基于本体理念的零件描述模型可以有效地表达领域本体知识库中的零件信息。本体应用的优势之一就是更便捷的信息获取和检索,也就是能够智能化地获取分布式知识库系统中的领域知识。针对CAPP领域中分布式异构知识库系统的特点,以所建CAPP系统的领域本体知识库为资源,设计实现基于领域本体知识库的智能信息检索系统,以及该系统的体系架构。通过把能描述信息语义的本体论理念及其相关技术引入到该智能信息检索系统中,并把本体知识库作为系统的核心构件,在一定程度上可以提高信息检索的查全率和查准率。更多还原

【Abstract】 The notion of ontology and its technologies are introduced to CAPP (Computer Aided Process Planning) application system in this dissertation, and domain ontology repository of the system is created and part information of the repository is described by the ontology, and the repository-based intelligent information retrieval system is designed and implemented, in order to meet requirement of utmost sharing and reuse of the CAPP domain knowledge. Reference to successful experiences of the ontology in information systems such as artificial intelligence, and under the participation of domain experts, a domain ontology repository of the CAPP system is constructed at different abstract level, in which the DAML+OIL language and the editor Protégé 2000 are used to annotate syntax and semantics of concepts, their attributes and relations among concepts, and the repository is managed and maintained by hierarchical model of inverse tree. On the basis of existing four expressive styles of part information, the notion of ontology and its technologies are introduced to the repository, and ontology-based description model of part information and three-layer framework of the model is proposed in the repository, and description pattern of part feature and its structure is presented in the framework, so that a typical example indicate s part information of the repository can be expressed effectively by the description model. Acquirement and retrieval of information conveniently is one of advantages of the ontology application, namely intelligent obtains domain knowledge from distributed system. Considering some characteristic s of distributed heterogeneous repository system in the CAPP domain and the created domain ontology repository is treated as information resource, and the domain ontology repository-based intelligent information retrieval system and its architecture is presented. Consequently, the notion of ontology and its technologies, which can describe semantics of the domain information, are introduced to the intelligent information retrieval system, in which the ontology repository is became kernel component, and to some extent further improves efficiency and precision of the information search.更多还原