Soft Computing in Information Retrieval Techniques and Applications

Information retrieval (IR) aims at defining systems able to provide a fast and effective content-based access to a large amount of stored information. The aim of an IR system is to estimate the relevance of documents to users' information needs, expressed

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Studies in Fuzziness and Soft Computing Editor-in-chief Prof. Janusz Kacprzyk Systems Research Institute Polish Academy of Sciences ul. Newelska 6 01-447 Warsaw, Poland E-mail: [email protected] hup://www.springer.de/cgi-binJsearch_book.pl ?series =: 2941 Vol. 3. A. Geyer-Schulz. Fuz..ry Rule-Based Expert Systems and Genetic Machin e Leaming. 2nd ed. 1996 ISBN 3-7908-0964-0

Vol. 14. E. Hisdal Logieal Struetures Jor Representation oJ Knowledge and Uncertainty. 1998 ISB N 3-7908- \056-8

Vol. 4. T. Onisawa and J. Kaeprzyk (Eds.) Reliabiliry and SaJery Analyses under Fuzziness. 1995 ISBN 3-7908-0837-7

Vol. 15. G.J. K1ir and M.J . Wierrnan Uneertainry-Based 1njormation. 2nd ed.. 1999 ISBN 3-7908-1242-0

Vol. 5. P. Bose and J. Kaeprzyk (Eds.) Fuzziness in Database Management Systems. 1995 ISBN 3-7908-0858-X

Vol. 16. D. Driankov and R. Palm (Eds.) Advances in Fuzzy Control. 1998 ISBN 3-7908- 1090-8

Vol. 6. E. S. Lee and Q. Zhu Fuzzy and Evidence Reasoning. 1995 ISBN 3-7908-0880-6

Vol. 17. L. Reznik. V. Dimitrov and J. Kacprzyk (Eds.) Fuz.."Y Systems Design. 1998 ISBN 3-7908-1118-1

Vol. 7. B. A. Juliano and W. Bandler Tracing Chains-of-Thought. 1996 ISBN 3-7908-0922-5 Vol. 8. F. Herrera and J. L. Verdegay (Eds.) Genetic Aigorithms and Soft Computing. 1996 ISBN 3-7908-0956-X Vol. 9. M. Sato et al. Fuz.."Y Clustering Models and Applications. 1997 ISBN 3-7908-1026-6 Vol. 10. L. C. Jain (Ed.) Soft Computing Techniques in Knmvledgebased lntelligem Engineering Systems. 1997 ISBN 3-7908-\035-5 Vol. 11. W. Mielczarski (Ed.) Fuz;.:y Logic Techniques in Power Systems. 1998 ISBN 3-7908- 1044-4 Vol. 12. B. Bouchon-Meunier (Ed.) Aggregation and Fusion oJ Imperfeet InJomwtion. 1998 ISBN 3-7908- \048-7 Vol. 13. E. Orlowska (Ed.) lncomplete ln!omwtion: Rough Set Analysis. 1998 ISBN 3-7908- \049-5

Vol. 18. L. Po1kowski and A. Skowron (Eds.) Rough Sets in Knowledge Discovery 1. 1998 ISBN 3-7908-1119-X Vol. 19. L. Polkowski and A. Skowron (Eds.) Rough Sets in Knowledge Discovery 2. 1998 ISBN 3-7908-1120-3 Vol. 20. J.N. Mordeson and P.S. Nair Fuz:y Mathematics. 1998 ISBN 3-7908-1121-1 Vol. 21. L.c. Jain and T. Fukuda (Eds.) Soft Computing Jor Intelligent Robotic Systems. 1998 ISBN 3-7908-1147-5 Vol. 22. J. Cardoso and H. Camargo (Eds.) Fuz;.:iness in Petri Nets. 1999 ISBN 3-7908-1158-0 Vol. 23. P. S. Szczepaniak (Ed .) Computational 1ntelligenee and Applications. 1999 ISBN 3-7908-1161-0 Vol. 24. E. Orlowska (Ed.) Logic at Work. 1999 ISBN 3-7908-1164-5 continued on page 395

Fabio Crestani . Gabriella Pasi (Eds.)

Soft Computing in Information Retrieval Techniques and Applications With 100 Figures and 44 Tables

Springer-Verlag Berlin Heidelberg GmbH A Springer-Verlag Company

Dr. Fabio Crestani Department of Computing Science University of Glasgow Glasgow G128QQ Scotland E-mail: [email protected] Dr. Gabriella Pasi ITIM-CNR Via Ampere 56 20131 Milano Italy E-mail: [email protected]

ISSN 1434-9922 ISBN 978-3-7908-2473-5 ISBN 978-3-7908-1849-9 (eBook) DOI 10.1007/978-3-7908-1849-9 Cataloging-in-Publication Data ap