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Query expansion med semantiskt relaterade termer
University of Borås, Swedish School of Library and Information Science.
2004 (Swedish)Independent thesis Advanced level (degree of Master (One Year))Student thesisAlternative title
Query expansion with semantically related words (English)
Abstract [en]

The aim of this masters thesis is to examine query expansion. Query expansion is the process of adding new terms to a query to improve the retrieval effectiveness. In this study the baseline query was expanded in five different modes. The first expansion strategy was formulated by the inflected terms as the system does not allow truncation, I have inflected the terms, e. g. airplane, airplanes, the airplanes, etc. in the baseline strategy. The second expansion strategy consisted of synonyms from a dictionary of synonyms. For the terms in the remaining three expansion strategies a general thesaurus was used which contained hierarchical and associative term relationships in order to find broader, narrower and related expansion terms. Relative recall and average precision was measured. The average results show that the expansion with inflected terms from the baseline query gave the most effective retrieval, both concerning increase in relative recall and average precision.

Place, publisher, year, edition, pages
University College of Borås. Swedish School of Library and Information Science (SSLIS) , 2004.
Series
Magisteruppsats i biblioteks- och informationsvetenskap vid Bibliotekshögskolan/Biblioteks- och informationsvetenskap, ISSN 1404-0891 ; 2004:84
Keywords [en]
library and information science
Keywords [sv]
biblioteks- och informationsvetenskap
National Category
Social Sciences
Identifiers
URN: urn:nbn:se:hb:diva-16707Local ID: 2320/1118OAI: oai:DiVA.org:hb-16707DiVA, id: diva2:1308595
Note
Uppsatsnivå: DAvailable from: 2019-04-30 Created: 2019-04-30

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CiteExportLink to record
Permanent link

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Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf