Adaptive calculation of scores for fresh information retrieval

Minoru Uehara, Nobuyoshi Sato, Yoshifumi Sakai

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)

    Abstract

    In business, we need fresh information. In order to realize fresh information retrieval, we need not only to collect documents in a short time, but also to rank the results in the suitable order. However, conventional ranking methods are not suited for fresh information retrieval because they ignore temporal value of information. So, we have proposed the novel ranking method FTFIDF for fresh information retrieval. FTF·IDF extends TF·IDF by means of using FTF(fresh term frequency) instead of TF(term frequency). FTP differs from TF because FTP decreases as time goes. The speed of decreasing FTP is determined by the dumping factor. The dumping factor is sensitive against small changes of documents. So, we use a threshold to ignore such small changes. In some papers we published, we detect the optimal threshold manually. In this paper, we proposed an adaptive calculating method in order to detect threshold automatically. In this method, the optimal value is determined by iterating to test generated thresholds. In this paper, we describe our method and its evaluation.

    Original languageEnglish
    Title of host publicationProceedings - 11th International Conference on Parallel and Distributed Systems Workshops, ICPADS 2005
    EditorsL. Barolli
    Pages750-755
    Number of pages6
    DOIs
    Publication statusPublished - 2005 Sep 1
    Event11th International Conference on Parallel and Distributed Systems Workshops, ICPADS 2005 - Fukuoka, Japan
    Duration: 2005 Jul 202005 Jul 22

    Publication series

    NameProceedings of the International Conference on Parallel and Distributed Systems - ICPADS
    Volume1
    ISSN (Print)1521-9097

    Other

    Other11th International Conference on Parallel and Distributed Systems Workshops, ICPADS 2005
    Country/TerritoryJapan
    CityFukuoka
    Period05/7/2005/7/22

    Keywords

    • Distributed search engine
    • Fresh information retrieval
    • Ranking

    ASJC Scopus subject areas

    • Hardware and Architecture

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