Mathematical model of information retrieval system based on the concept of Fuzzy thesaurus

摘要

The object of this paper is to present a mathematical model of information retrieval system based on the concept of fuzzy thesaurus. For this purpose the mathematical methods of A. Zadeh's theory of fuzzy sets have been used.The application of the theory of fuzzy sets to the description of information retrieval system makes it possible (1) to take into account the fact that the degrȩe of importance of the particular terms in the search patterns of the particular documents and information requrets is of a continuous character, (2) to formalize the relations between terms describing documents and information requests (fuzzy thesaurus).The use of simple operations of the theory of fuzzy sets makes it possible to retrieve documents with the highest degree of relevance to the information requests of the users of the information system.