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  • Petras, Vivien
  • 1
    Online-Ressource
    Online-Ressource
    Berlin : Humboldt-Universität zu Berlin
    UID:
    edochu_18452_21178
    Umfang: 1 Online-Ressource (14 Seiten)
    Inhalt: In this paper we will describe the Berkeley (groups 1 and 2 combined) submissions and approaches to the GeoCLEF task for CLEF 2005. The two Berkeley groups used different systems and approaches for GeoCLEF with some common themes. For Berkeley group 1 (Larson) the main technique used was fusion of multiple probabilistic searches against different XML components using both Logistic Regression (LR) algorithms and a version of the Okapi BM-25 algorithm. The Berkeley group 2 (Gey and Petras) employed tested CLIR methods from previous CLEF evaluations using Logistic Regression with Blind Feedback. Both groups used multiple translations of queries in for cross-language searching, and the primary geographically-based approaches taken by both involved query expansion with additional place names. The Berkeley1 group used GIR indexing techniques to georeference proper nouns in the text using a gazetteer derived from the World Gazetteer (with both English and German names for each place), and automatically expanded place names in topics for regions or countries in the queries by the names of the countries or cities in those regions or countries. The Berkeley2 group used manual expansion of queries, adding additional place names.
    Inhalt: Peer Reviewed
    Sprache: Englisch
    URL: Volltext  (kostenfrei)
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    UID:
    edochu_18452_21177
    Umfang: 1 Online-Ressource (10 Seiten)
    Inhalt: Metadata is ordinarily used to describe documents, but it can also constitute a form of infrastructure for access to networked resources and for traversal of those resources. One problematic area for access to digital library resources has been the search for time periods or events. If there is a capability to search for time, it is usually a date search - a standardized and precise form but unfortunately rarely used in common chronological expressions. For example, a user interested in the "Vietnam war", "Clinton Administration" or the "Elizabethan Period" must either know the corresponding dates, or rely on simple keyword matching for those period names. We consider the ability to interpret user statements of periods or eras as ranges of dates and to associate them with particular locations an important feature of an information system. This paper describes the Time Period Directory, a metadata infrastructure for named time periods linking them with their geographic location as well as a canonical time period range.
    Sprache: Englisch
    URL: Volltext  (kostenfrei)
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    UID:
    edochu_18452_21179
    Umfang: 1 Online-Ressource (12 Seiten)
    Inhalt: This paper describes the combined submissions of the Berkeley group for the domain-specific track at CLEF 2005. The data fusion technique being tested is the fusion of multiple probabilistic searches against different XML components using both Logistic Regression (LR) algorithms and a version of the Okapi BM-25 algorithm. We also combine multiple translations of queries in cross-language searching. The second technique analyzed is query enhancement with domain-specific metadata (thesaurus terms). We describe our technique of Entry Vocabulary Modules, which associates query words with thesaurus terms and suggest its use for monolingual as well as bilingual retrieval. Different weighting and merging schemes for adding keywords to queries as well as translation techniques are described.
    Inhalt: Peer Reviewed
    Sprache: Englisch
    URL: Volltext  (kostenfrei)
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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