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Conceptual Indexing using Latent Semantic Indexing: A Case Study
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology.
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology.
2015 (English)Independent thesis Basic level (university diploma), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Information Retrieval is concerned with locating information (usually text) that is relevant to a user's information need. Retrieval systems based on word matching suffer from the vocabulary mismatch problem, which is a common phenomenon in the usage of natural languages. This difficulty is especially severe in large, full-text databases since such databases contain many different expressions of the same concept. One method aimed to reduce the negative effects of the vocabulary mismatch problem is for the retrieval system to exploit statistical relations. This report examines the utility of conceptual indexing to improve retrieval performance of a domain specific Information Retrieval System using Latent Semantic Indexing (LSI). Techniques like LSI attempt to exploit and model global usage patterns of terms so that related documents that may not share common (literal) terms are still represented by nearby conceptual descriptors. Experimental results show that the method is noticeable more efficient, compared to baseline, for relatively complete queries. However, the current implementation did not improve the effectiveness of short, yet descriptive, queries.

Place, publisher, year, edition, pages
2015. , 58 p.
Series
IT, 15067
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-263029OAI: oai:DiVA.org:uu-263029DiVA: diva2:856529
Supervisors
Examiners
Available from: 2015-09-24 Created: 2015-09-24 Last updated: 2015-09-24Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
More languages
Output format
  • html
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