Search (332 results, page 2 of 17)

  • × theme_ss:"Retrievalalgorithmen"
  1. Efthimiadis, E.N.: User choices : a new yardstick for the evaluation of ranking algorithms for interactive query expansion (1995) 0.02 
    0.018214198 = product of:
  0.036428396 = sum of:
    0.036428396 = sum of:
      0.0052524996 = weight(_text_:e in 5697) [ClassicSimilarity], result of:
        0.0052524996 = score(doc=5697,freq=2.0), product of:
          0.06614887 = queryWeight, product of:
            1.43737 = idf(docFreq=28552, maxDocs=44218)
            0.04602077 = queryNorm
          0.07940422 = fieldWeight in 5697, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            1.43737 = idf(docFreq=28552, maxDocs=44218)
            0.0390625 = fieldNorm(doc=5697)
      0.031175895 = weight(_text_:22 in 5697) [ClassicSimilarity], result of:
        0.031175895 = score(doc=5697,freq=2.0), product of:
          0.1611569 = queryWeight, product of:
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.04602077 = queryNorm
          0.19345059 = fieldWeight in 5697, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.0390625 = fieldNorm(doc=5697)
  0.5 = coord(1/2)
    Date
    22. 2.1996 13:14:10
    Language
    e
  2. Song, D.; Bruza, P.D.: Towards context sensitive information inference (2003) 0.02 
    0.018214198 = product of:
  0.036428396 = sum of:
    0.036428396 = sum of:
      0.0052524996 = weight(_text_:e in 1428) [ClassicSimilarity], result of:
        0.0052524996 = score(doc=1428,freq=2.0), product of:
          0.06614887 = queryWeight, product of:
            1.43737 = idf(docFreq=28552, maxDocs=44218)
            0.04602077 = queryNorm
          0.07940422 = fieldWeight in 1428, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            1.43737 = idf(docFreq=28552, maxDocs=44218)
            0.0390625 = fieldNorm(doc=1428)
      0.031175895 = weight(_text_:22 in 1428) [ClassicSimilarity], result of:
        0.031175895 = score(doc=1428,freq=2.0), product of:
          0.1611569 = queryWeight, product of:
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.04602077 = queryNorm
          0.19345059 = fieldWeight in 1428, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.0390625 = fieldNorm(doc=1428)
  0.5 = coord(1/2)
    Date
    22. 3.2003 19:35:46
    Language
    e
  3. Shiri, A.A.; Revie, C.: Query expansion behavior within a thesaurus-enhanced search environment : a user-centered evaluation (2006) 0.02 
    0.018214198 = product of:
  0.036428396 = sum of:
    0.036428396 = sum of:
      0.0052524996 = weight(_text_:e in 56) [ClassicSimilarity], result of:
        0.0052524996 = score(doc=56,freq=2.0), product of:
          0.06614887 = queryWeight, product of:
            1.43737 = idf(docFreq=28552, maxDocs=44218)
            0.04602077 = queryNorm
          0.07940422 = fieldWeight in 56, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            1.43737 = idf(docFreq=28552, maxDocs=44218)
            0.0390625 = fieldNorm(doc=56)
      0.031175895 = weight(_text_:22 in 56) [ClassicSimilarity], result of:
        0.031175895 = score(doc=56,freq=2.0), product of:
          0.1611569 = queryWeight, product of:
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.04602077 = queryNorm
          0.19345059 = fieldWeight in 56, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.0390625 = fieldNorm(doc=56)
  0.5 = coord(1/2)
    Date
    22. 7.2006 16:32:43
    Language
    e
  4. Dominich, S.: Mathematical foundations of information retrieval (2001) 0.02 
    0.018214198 = product of:
  0.036428396 = sum of:
    0.036428396 = sum of:
      0.0052524996 = weight(_text_:e in 1753) [ClassicSimilarity], result of:
        0.0052524996 = score(doc=1753,freq=2.0), product of:
          0.06614887 = queryWeight, product of:
            1.43737 = idf(docFreq=28552, maxDocs=44218)
            0.04602077 = queryNorm
          0.07940422 = fieldWeight in 1753, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            1.43737 = idf(docFreq=28552, maxDocs=44218)
            0.0390625 = fieldNorm(doc=1753)
      0.031175895 = weight(_text_:22 in 1753) [ClassicSimilarity], result of:
        0.031175895 = score(doc=1753,freq=2.0), product of:
          0.1611569 = queryWeight, product of:
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.04602077 = queryNorm
          0.19345059 = fieldWeight in 1753, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.0390625 = fieldNorm(doc=1753)
  0.5 = coord(1/2)
    Date
    22. 3.2008 12:26:32
    Language
    e
  5. Baloh, P.; Desouza, K.C.; Hackney, R.: Contextualizing organizational interventions of knowledge management systems : a design science perspectiveA domain analysis (2012) 0.02 
    0.018214198 = product of:
  0.036428396 = sum of:
    0.036428396 = sum of:
      0.0052524996 = weight(_text_:e in 241) [ClassicSimilarity], result of:
        0.0052524996 = score(doc=241,freq=2.0), product of:
          0.06614887 = queryWeight, product of:
            1.43737 = idf(docFreq=28552, maxDocs=44218)
            0.04602077 = queryNorm
          0.07940422 = fieldWeight in 241, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            1.43737 = idf(docFreq=28552, maxDocs=44218)
            0.0390625 = fieldNorm(doc=241)
      0.031175895 = weight(_text_:22 in 241) [ClassicSimilarity], result of:
        0.031175895 = score(doc=241,freq=2.0), product of:
          0.1611569 = queryWeight, product of:
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.04602077 = queryNorm
          0.19345059 = fieldWeight in 241, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.0390625 = fieldNorm(doc=241)
  0.5 = coord(1/2)
    Date
    11. 6.2012 14:22:34
    Language
    e
  6. Soulier, L.; Jabeur, L.B.; Tamine, L.; Bahsoun, W.: On ranking relevant entities in heterogeneous networks using a language-based model (2013) 0.02 
    0.018214198 = product of:
  0.036428396 = sum of:
    0.036428396 = sum of:
      0.0052524996 = weight(_text_:e in 664) [ClassicSimilarity], result of:
        0.0052524996 = score(doc=664,freq=2.0), product of:
          0.06614887 = queryWeight, product of:
            1.43737 = idf(docFreq=28552, maxDocs=44218)
            0.04602077 = queryNorm
          0.07940422 = fieldWeight in 664, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            1.43737 = idf(docFreq=28552, maxDocs=44218)
            0.0390625 = fieldNorm(doc=664)
      0.031175895 = weight(_text_:22 in 664) [ClassicSimilarity], result of:
        0.031175895 = score(doc=664,freq=2.0), product of:
          0.1611569 = queryWeight, product of:
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.04602077 = queryNorm
          0.19345059 = fieldWeight in 664, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.0390625 = fieldNorm(doc=664)
  0.5 = coord(1/2)
    Date
    22. 3.2013 19:34:49
    Language
    e
  7. Khoo, C.S.G.; Wan, K.-W.: ¬A simple relevancy-ranking strategy for an interface to Boolean OPACs (2004) 0.02 
    0.015414644 = product of:
  0.030829288 = sum of:
    0.030829288 = sum of:
      0.009006161 = weight(_text_:e in 2509) [ClassicSimilarity], result of:
        0.009006161 = score(doc=2509,freq=12.0), product of:
          0.06614887 = queryWeight, product of:
            1.43737 = idf(docFreq=28552, maxDocs=44218)
            0.04602077 = queryNorm
          0.13614988 = fieldWeight in 2509, product of:
            3.4641016 = tf(freq=12.0), with freq of:
              12.0 = termFreq=12.0
            1.43737 = idf(docFreq=28552, maxDocs=44218)
            0.02734375 = fieldNorm(doc=2509)
      0.021823127 = weight(_text_:22 in 2509) [ClassicSimilarity], result of:
        0.021823127 = score(doc=2509,freq=2.0), product of:
          0.1611569 = queryWeight, product of:
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.04602077 = queryNorm
          0.1354154 = fieldWeight in 2509, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            3.5018296 = idf(docFreq=3622, maxDocs=44218)
            0.02734375 = fieldNorm(doc=2509)
  0.5 = coord(1/2)
    Abstract
    A relevancy-ranking algorithm for a natural language interface to Boolean online public access catalogs (OPACs) was formulated and compared with that currently used in a knowledge-based search interface called the E-Referencer, being developed by the authors. The algorithm makes use of seven weIl-known ranking criteria: breadth of match, section weighting, proximity of query words, variant word forms (stemming), document frequency, term frequency and document length. The algorithm converts a natural language query into a series of increasingly broader Boolean search statements. In a small experiment with ten subjects in which the algorithm was simulated by hand, the algorithm obtained good results with a mean overall precision of 0.42 and mean average precision of 0.62, representing a 27 percent improvement in precision and 41 percent improvement in average precision compared to the E-Referencer. The usefulness of each step in the algorithm was analyzed and suggestions are made for improving the algorithm.
    Content
    "Most Web search engines accept natural language queries, perform some kind of fuzzy matching and produce ranked output, displaying first the documents that are most likely to be relevant. On the other hand, most library online public access catalogs (OPACs) an the Web are still Boolean retrieval systems that perform exact matching, and require users to express their search requests precisely in a Boolean search language and to refine their search statements to improve the search results. It is well-documented that users have difficulty searching Boolean OPACs effectively (e.g. Borgman, 1996; Ensor, 1992; Wallace, 1993). One approach to making OPACs easier to use is to develop a natural language search interface that acts as a middleware between the user's Web browser and the OPAC system. The search interface can accept a natural language query from the user and reformulate it as a series of Boolean search statements that are then submitted to the OPAC. The records retrieved by the OPAC are ranked by the search interface before forwarding them to the user's Web browser. The user, then, does not need to interact directly with the Boolean OPAC but with the natural language search interface or search intermediary. The search interface interacts with the OPAC system an the user's behalf. The advantage of this approach is that no modification to the OPAC or library system is required. Furthermore, the search interface can access multiple OPACs, acting as a meta search engine, and integrate search results from various OPACs before sending them to the user. The search interface needs to incorporate a method for converting the user's natural language query into a series of Boolean search statements, and for ranking the OPAC records retrieved. The purpose of this study was to develop a relevancyranking algorithm for a search interface to Boolean OPAC systems. This is part of an on-going effort to develop a knowledge-based search interface to OPACs called the E-Referencer (Khoo et al., 1998, 1999; Poo et al., 2000). E-Referencer v. 2 that has been implemented applies a repertoire of initial search strategies and reformulation strategies to retrieve records from OPACs using the Z39.50 protocol, and also assists users in mapping query keywords to the Library of Congress subject headings."
    Language
    e
    Object
    E-Referencer
    Source
    Electronic library. 22(2004) no.2, S.112-120
  8. Tober, M.; Hennig, L.; Furch, D.: SEO Ranking-Faktoren und Rang-Korrelationen 2014 : Google Deutschland (2014) 0.01 
    0.012470358 = product of:
  0.024940716 = sum of:
    0.024940716 = product of:
      0.049881432 = sum of:
        0.049881432 = weight(_text_:22 in 1484) [ClassicSimilarity], result of:
          0.049881432 = score(doc=1484,freq=2.0), product of:
            0.1611569 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04602077 = queryNorm
            0.30952093 = fieldWeight in 1484, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0625 = fieldNorm(doc=1484)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Date
    13. 9.2014 14:45:22
  9. Kanaeva, Z.: Ranking: Google und CiteSeer (2005) 0.01 
    0.010911563 = product of:
  0.021823127 = sum of:
    0.021823127 = product of:
      0.043646254 = sum of:
        0.043646254 = weight(_text_:22 in 3276) [ClassicSimilarity], result of:
          0.043646254 = score(doc=3276,freq=2.0), product of:
            0.1611569 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.04602077 = queryNorm
            0.2708308 = fieldWeight in 3276, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.0546875 = fieldNorm(doc=3276)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Date
    20. 3.2005 16:23:22
  10. Rada, R.; Bicknell, E.: Ranking documents with a thesaurus (1989) 0.01 
    0.005942525 = product of:
  0.01188505 = sum of:
    0.01188505 = product of:
      0.0237701 = sum of:
        0.0237701 = weight(_text_:e in 6908) [ClassicSimilarity], result of:
          0.0237701 = score(doc=6908,freq=4.0), product of:
            0.06614887 = queryWeight, product of:
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.04602077 = queryNorm
            0.3593425 = fieldWeight in 6908, product of:
              2.0 = tf(freq=4.0), with freq of:
                4.0 = termFreq=4.0
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.125 = fieldNorm(doc=6908)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Language
    e
  11. Harper, D.J.: Relevance feedback in document retrieval (1980) 0.01 
    0.0052524996 = product of:
  0.010504999 = sum of:
    0.010504999 = product of:
      0.021009998 = sum of:
        0.021009998 = weight(_text_:e in 5867) [ClassicSimilarity], result of:
          0.021009998 = score(doc=5867,freq=2.0), product of:
            0.06614887 = queryWeight, product of:
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.04602077 = queryNorm
            0.31761688 = fieldWeight in 5867, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.15625 = fieldNorm(doc=5867)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Language
    e
  12. Salton, G.; Buckley, C.: Parallel text search methods (1988) 0.00 
    0.0042019994 = product of:
  0.008403999 = sum of:
    0.008403999 = product of:
      0.016807998 = sum of:
        0.016807998 = weight(_text_:e in 404) [ClassicSimilarity], result of:
          0.016807998 = score(doc=404,freq=2.0), product of:
            0.06614887 = queryWeight, product of:
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.04602077 = queryNorm
            0.2540935 = fieldWeight in 404, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.125 = fieldNorm(doc=404)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Language
    e
  13. Robertson, S.E.; Belkin, N.J.: Ranking in principle (1978) 0.00 
    0.0042019994 = product of:
  0.008403999 = sum of:
    0.008403999 = product of:
      0.016807998 = sum of:
        0.016807998 = weight(_text_:e in 1143) [ClassicSimilarity], result of:
          0.016807998 = score(doc=1143,freq=2.0), product of:
            0.06614887 = queryWeight, product of:
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.04602077 = queryNorm
            0.2540935 = fieldWeight in 1143, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.125 = fieldNorm(doc=1143)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Language
    e
  14. Rijsbergen, C.J. van: ¬A fast hierarchic clustering algorithm (1970) 0.00 
    0.0042019994 = product of:
  0.008403999 = sum of:
    0.008403999 = product of:
      0.016807998 = sum of:
        0.016807998 = weight(_text_:e in 3300) [ClassicSimilarity], result of:
          0.016807998 = score(doc=3300,freq=2.0), product of:
            0.06614887 = queryWeight, product of:
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.04602077 = queryNorm
            0.2540935 = fieldWeight in 3300, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.125 = fieldNorm(doc=3300)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Language
    e
  15. Wu, H.; Salton, G.: ¬The estimation of term relevance weights using relevance feedback (1981) 0.00 
    0.0042019994 = product of:
  0.008403999 = sum of:
    0.008403999 = product of:
      0.016807998 = sum of:
        0.016807998 = weight(_text_:e in 4728) [ClassicSimilarity], result of:
          0.016807998 = score(doc=4728,freq=2.0), product of:
            0.06614887 = queryWeight, product of:
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.04602077 = queryNorm
            0.2540935 = fieldWeight in 4728, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.125 = fieldNorm(doc=4728)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Language
    e
  16. Sparck Jones, K.: ¬A statistical interpretation of term specifity and its application in retrieval (1972) 0.00 
    0.0042019994 = product of:
  0.008403999 = sum of:
    0.008403999 = product of:
      0.016807998 = sum of:
        0.016807998 = weight(_text_:e in 5187) [ClassicSimilarity], result of:
          0.016807998 = score(doc=5187,freq=2.0), product of:
            0.06614887 = queryWeight, product of:
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.04602077 = queryNorm
            0.2540935 = fieldWeight in 5187, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.125 = fieldNorm(doc=5187)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Language
    e
  17. Salton, G.: ¬A simple blueprint for automatic Boolean query processing (1988) 0.00 
    0.0042019994 = product of:
  0.008403999 = sum of:
    0.008403999 = product of:
      0.016807998 = sum of:
        0.016807998 = weight(_text_:e in 6774) [ClassicSimilarity], result of:
          0.016807998 = score(doc=6774,freq=2.0), product of:
            0.06614887 = queryWeight, product of:
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.04602077 = queryNorm
            0.2540935 = fieldWeight in 6774, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.125 = fieldNorm(doc=6774)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Language
    e
  18. Kantor, P.B.: ¬The logic of weighted queries (1981) 0.00 
    0.0042019994 = product of:
  0.008403999 = sum of:
    0.008403999 = product of:
      0.016807998 = sum of:
        0.016807998 = weight(_text_:e in 7622) [ClassicSimilarity], result of:
          0.016807998 = score(doc=7622,freq=2.0), product of:
            0.06614887 = queryWeight, product of:
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.04602077 = queryNorm
            0.2540935 = fieldWeight in 7622, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.125 = fieldNorm(doc=7622)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Language
    e
  19. Reddaway, S.: High speed text retrieval from large databases on a massively parallel processor (1991) 0.00 
    0.0042019994 = product of:
  0.008403999 = sum of:
    0.008403999 = product of:
      0.016807998 = sum of:
        0.016807998 = weight(_text_:e in 7745) [ClassicSimilarity], result of:
          0.016807998 = score(doc=7745,freq=2.0), product of:
            0.06614887 = queryWeight, product of:
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.04602077 = queryNorm
            0.2540935 = fieldWeight in 7745, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.125 = fieldNorm(doc=7745)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Language
    e
  20. Davis, C.H.: Beyond Boole : the next logical step (1995) 0.00 
    0.0042019994 = product of:
  0.008403999 = sum of:
    0.008403999 = product of:
      0.016807998 = sum of:
        0.016807998 = weight(_text_:e in 3550) [ClassicSimilarity], result of:
          0.016807998 = score(doc=3550,freq=2.0), product of:
            0.06614887 = queryWeight, product of:
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.04602077 = queryNorm
            0.2540935 = fieldWeight in 3550, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.43737 = idf(docFreq=28552, maxDocs=44218)
              0.125 = fieldNorm(doc=3550)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Language
    e

Authors

Years

Languages

  • e 323
  • d 8
  • m 1
  • More… Less…

Types

  • a 309
  • m 11
  • el 6
  • s 5
  • r 3
  • p 2
  • d 1
  • x 1
  • More… Less…

Themes

Subjects

Classifications