Search (3 results, page 1 of 1)

  • × theme_ss:"OPAC"
  • × theme_ss:"Retrievalalgorithmen"
  • × year_i:[2000 TO 2010}
  1. Khoo, C.S.G.; Wan, K.-W.: ¬A simple relevancy-ranking strategy for an interface to Boolean OPACs (2004) 0.04 
    0.038244486 = sum of:
  0.010659893 = product of:
    0.042639572 = sum of:
      0.042639572 = weight(_text_:authors in 2509) [ClassicSimilarity], result of:
        0.042639572 = score(doc=2509,freq=2.0), product of:
          0.2418733 = queryWeight, product of:
            4.558814 = idf(docFreq=1258, maxDocs=44218)
            0.053056188 = queryNorm
          0.17628889 = fieldWeight in 2509, product of:
            1.4142135 = tf(freq=2.0), with freq of:
              2.0 = termFreq=2.0
            4.558814 = idf(docFreq=1258, maxDocs=44218)
            0.02734375 = fieldNorm(doc=2509)
    0.25 = coord(1/4)
  0.027584592 = sum of:
    0.0024252585 = weight(_text_:s in 2509) [ClassicSimilarity], result of:
      0.0024252585 = score(doc=2509,freq=2.0), product of:
        0.057684682 = queryWeight, product of:
          1.0872376 = idf(docFreq=40523, maxDocs=44218)
          0.053056188 = queryNorm
        0.04204337 = fieldWeight in 2509, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          1.0872376 = idf(docFreq=40523, maxDocs=44218)
          0.02734375 = fieldNorm(doc=2509)
    0.025159333 = weight(_text_:22 in 2509) [ClassicSimilarity], result of:
      0.025159333 = score(doc=2509,freq=2.0), product of:
        0.18579373 = queryWeight, product of:
          3.5018296 = idf(docFreq=3622, maxDocs=44218)
          0.053056188 = 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)
    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.
    Source
    Electronic library. 22(2004) no.2, S.112-120
  2. Archuby, C.G.: Interfaces se recuperacion para catalogos en linea con salidas ordenadas por probable relevancia (2000) 0.00 
    0.0017323275 = product of:
  0.003464655 = sum of:
    0.003464655 = product of:
      0.00692931 = sum of:
        0.00692931 = weight(_text_:s in 5727) [ClassicSimilarity], result of:
          0.00692931 = score(doc=5727,freq=2.0), product of:
            0.057684682 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.053056188 = queryNorm
            0.120123915 = fieldWeight in 5727, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.078125 = fieldNorm(doc=5727)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Source
    Ciencia da informacao. 29(2000) no.3, S.5-13
  3. Oberhauser, O.; Labner, J.: Relevance Ranking in Online-Katalogen : Informationsstand und Perspektiven (2003) 0.00 
    0.0012126293 = product of:
  0.0024252585 = sum of:
    0.0024252585 = product of:
      0.004850517 = sum of:
        0.004850517 = weight(_text_:s in 2188) [ClassicSimilarity], result of:
          0.004850517 = score(doc=2188,freq=2.0), product of:
            0.057684682 = queryWeight, product of:
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.053056188 = queryNorm
            0.08408674 = fieldWeight in 2188, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              1.0872376 = idf(docFreq=40523, maxDocs=44218)
              0.0546875 = fieldNorm(doc=2188)
      0.5 = coord(1/2)
  0.5 = coord(1/2)
    Source
    Mitteilungen der Vereinigung Österreichischer Bibliothekarinnen und Bibliothekare. 56(2003) H.3/4, S.49-63

Authors

Languages