Search (2 results, page 1 of 1)

  • × author_ss:"Zobel, J."
  • × theme_ss:"Retrievalalgorithmen"
  • × year_i:[2000 TO 2010}
  1. Kaszkiel, M.; Zobel, J.: Effective ranking with arbitrary passages (2001) 0.01 
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    Abstract
    Text retrieval systems store a great variety of documents, from abstracts, newspaper articles, and Web pages to journal articles, books, court transcripts, and legislation. Collections of diverse types of documents expose shortcomings in current approaches to ranking. Use of short fragments of documents, called passages, instead of whole documents can overcome these shortcomings: passage ranking provides convenient units of text to return to the user, can avoid the difficulties of comparing documents of different length, and enables identification of short blocks of relevant material among otherwise irrelevant text. In this article, we compare several kinds of passage in an extensive series of experiments. We introduce a new type of passage, overlapping fragments of either fixed or variable length. We show that ranking with these arbitrary passages gives substantial improvements in retrieval effectiveness over traditional document ranking schemes, particularly for queries on collections of long documents. Ranking with arbitrary passages shows consistent improvements compared to ranking with whole documents, and to ranking with previous passage types that depend on document structure or topic shifts in documents
    Source
    Journal of the American Society for Information Science and technology. 52(2001) no.4, S.344-364
  2. Heinz, S.; Zobel, J.: Efficient single-pass index construction for text databases (2003) 0.00 
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    Source
    Journal of the American Society for Information Science and technology. 54(2003) no.8, S.713-729

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