The book classifier : an automatic classification system for Hong Kong school Libraries based on Dewey Decimal Classification Scheme

Pao Yue-kong Library Electronic Theses Database

The book classifier : an automatic classification system for Hong Kong school Libraries based on Dewey Decimal Classification Scheme

 

Author: Cheng, Tak-keung
Title: The book classifier : an automatic classification system for Hong Kong school Libraries based on Dewey Decimal Classification Scheme
Degree: M.Sc.
Year: 1994
Subject: School libraries -- China -- Hong Kong -- Automation
Classification, Dewey decimal
Hong Kong Polytechnic -- Dissertations
Department: Multi-disciplinary Studies
Pages: iv, 86 leaves ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1158287
URI: http://theses.lib.polyu.edu.hk/handle/200/3573
Abstract: The Book Classifier, as the name suggests, is an automatic classification system for Hong Kong school libraries based on Dewey Decimal Classification schedule. Given a book intakes, the system basically makes use of statistical techniques rather than linguistic techniques in the process of automatic text analysis. Firstly, a term extraction process is carried out on the content representatives of the book followed by term reduction. As a result, some class vector is generated for a particular class of books. In order to measure the conformity of a book to the different class vectors, logical overlap coefficient is modified as accorded to the frequency significance of the keyterms. The book is then assigned to the class having the highest coefficient. In order to prevent excessive classification, threshold is suggested to be included in classification rule. It is found that a low threshold will lead to close classification while a high one will lead to broad classification. In our case, the optimum threshold found by comparison technique is about 0.2. In an experiment with our implemented system, it is estimated that over 88% of the books are tested to be classified correctly and the productivity of the automated system is five times that of the manual systems.

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