Abstract
In this thesis was conducted to propose a method for efficient information retrieval using concept lattices. Since this thesis designed a new system based on ordinary concept lattices, it has the sam e approach method as ontology, but this thesis proposes new concept lattices to be used by establishing collaborative relat ions between objects and concepts that users are likely to search information more efficiently. The system suggested by this thes is can be summarized as below. Firstly, this system leads to a collaborative search by using T hree kinds of concepts, such as keyword concept lattices, which focus on input key words, expert concept lattices recommended by experts and theme concept lattices, and based on these 3 concept lattices, it will help users search information they want more efficiently. Besides, as the expert concept and the keyword concept become combined, further providing users with the frequency of keyword and the frequency of category, this system can function
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