Information retrieval systems of the Internet created on the baså of the thematic catalogue, give
The researches show, that the development of methods of creation of the automatic thematic catalogues without person's interference is actual and much promising. Here it is supposed, that the search robot of a system itself should determine subjects of information resource, the most eligible theme profiles from the thematic catalogues and to include resource into them. Thus the created thematic catalogues can be built according to present standards ÓÄÊ, ÁÁÊ etc. The created in this way automatic thematic catalogue can substitute the person (manager or operator of the retrieval system), will allow to execute activities on creation, service and updating of the thematic catalogue of the retrieval system.
In the present article the model of information search is researched. The methods of definition of information resources subjects, splitting of the information space on thematic directions and improvement of the thematic catalogue are considered. For the solution of formulated problems the theory of fuzzy sets and relations, and also approach Bellman-Zadeh are used.
Keywords: information retrieval, retrieval system, information resource, thematic catalogue, automatic index, automatic thematic catalogue, fuzzy sets, fuzzy relations.
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