通过调查总结叙词表在文献数据库中的应用现状,在此基础上设计一个基于叙词表的文献数据库知识单元检索系统。该系统首先将数据库中的文献分解为知识单元,检索时用叙词表中的正式叙词对用户输入的检索词进行规范化处理,并将该正式叙词作为中心词,利用叙词表中的词间关系查找出该词的等同词、上下位词和相关词作为扩展检索词,对知识单元进行加权检索,按权值之和以及检索词的密集程度排序输出。经实例分析,具有可行性。 Through investigating and summarizing the application status of the thesauri in the literature database, a knowledge database retrieval system based on thesaurus is designed. The system first decomposes the documents in the database into units of knowledge, and uses the official descriptors in the thesaurus to normalize the search terms entered by the user. The formal descriptor is used as the central word, The relationship between the words to find out the words of the equivalent, the upper and lower terms and related words as extended search terms, knowledge units weighted search, according to the weight and search terms of the intensity of the order of the output. The case analysis is feasible.