Search (77 results, page 2 of 4)

  • × theme_ss:"Retrievalalgorithmen"
  1. Chen, Z.; Meng, X.; Fowler, R.H.; Zhu, B.: Real-time adaptive feature and document learning for Web search (2001) 0.01 
    0.013269257 = product of:
  0.053077027 = sum of:
    0.053077027 = weight(_text_:et in 5209) [ClassicSimilarity], result of:
      0.053077027 = score(doc=5209,freq=2.0), product of:
        0.20477319 = queryWeight, product of:
          4.692005 = idf(docFreq=1101, maxDocs=44218)
          0.043643 = queryNorm
        0.2591991 = fieldWeight in 5209, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          4.692005 = idf(docFreq=1101, maxDocs=44218)
          0.0390625 = fieldNorm(doc=5209)
  0.25 = coord(1/4)
    Abstract
    Chen et alia report on the design of FEATURES, a web search engine with adaptive features based on minimal relevance feedback. Rather than developing user profiles from previous searcher activity either at the server or client location, or updating indexes after search completion, FEATURES allows for index and user characterization files to be updated during query modification on retrieval from a general purpose search engine. Indexing terms relevant to a query are defined as the union of all terms assigned to documents retrieved by the initial search run and are used to build a vector space model on this retrieved set. The top ten weighted terms are presented to the user for a relevant non-relevant choice which is used to modify the term weights. Documents are chosen if their summed term weights are greater than some threshold. A user evaluation of the top ten ranked documents as non-relevant will decrease these term weights and a positive judgement will increase them. A new ordering of the retrieved set will generate new display lists of terms and documents. Precision is improved in a test on Alta Vista searches.
  2. Voorhees, E.M.: Implementing agglomerative hierarchic clustering algorithms for use in document retrieval (1986) 0.01 
    0.011826049 = product of:
  0.047304194 = sum of:
    0.047304194 = product of:
      0.09460839 = sum of:
        0.09460839 = weight(_text_:22 in 402) [ClassicSimilarity], result of:
          0.09460839 = score(doc=402,freq=2.0), product of:
            0.15283036 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.043643 = queryNorm
            0.61904186 = fieldWeight in 402, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.125 = fieldNorm(doc=402)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
    Source
    Information processing and management. 22(1986) no.6, S.465-476
  3. Tenopir, C.: Online databases : natural language searching with WIN (1993) 0.01 
    0.011474612 = product of:
  0.04589845 = sum of:
    0.04589845 = weight(_text_:c in 7038) [ClassicSimilarity], result of:
      0.04589845 = score(doc=7038,freq=2.0), product of:
        0.1505424 = queryWeight, product of:
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.043643 = queryNorm
        0.3048872 = fieldWeight in 7038, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.0625 = fieldNorm(doc=7038)
  0.25 = coord(1/4)
  4. Frakes, W.B.: Stemming algorithms (1992) 0.01 
    0.011474612 = product of:
  0.04589845 = sum of:
    0.04589845 = weight(_text_:c in 3503) [ClassicSimilarity], result of:
      0.04589845 = score(doc=3503,freq=2.0), product of:
        0.1505424 = queryWeight, product of:
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.043643 = queryNorm
        0.3048872 = fieldWeight in 3503, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.0625 = fieldNorm(doc=3503)
  0.25 = coord(1/4)
    Abstract
    Desribes stemming algorithms - programs that relate morphologically similar indexing and search terms. Stemming is used to improve retrieval effectiveness and to reduce the size of indexing files. Several approaches to stemming are describes - table lookup, affix removal, successor variety, and n-gram. empirical studies of stemming are summarized. The Porter stemmer is described in detail, and a full implementation in C is presented
  5. Stanfill, C.: Parallel information retrieval algorithms (1992) 0.01 
    0.011474612 = product of:
  0.04589845 = sum of:
    0.04589845 = weight(_text_:c in 3515) [ClassicSimilarity], result of:
      0.04589845 = score(doc=3515,freq=2.0), product of:
        0.1505424 = queryWeight, product of:
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.043643 = queryNorm
        0.3048872 = fieldWeight in 3515, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.0625 = fieldNorm(doc=3515)
  0.25 = coord(1/4)
  6. Behnert, C.; Borst, T.: Neue Formen der Relevanz-Sortierung in bibliothekarischen Informationssystemen : das DFG-Projekt LibRank (2015) 0.01 
    0.011474612 = product of:
  0.04589845 = sum of:
    0.04589845 = weight(_text_:c in 5392) [ClassicSimilarity], result of:
      0.04589845 = score(doc=5392,freq=2.0), product of:
        0.1505424 = queryWeight, product of:
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.043643 = queryNorm
        0.3048872 = fieldWeight in 5392, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.0625 = fieldNorm(doc=5392)
  0.25 = coord(1/4)
  7. Smeaton, A.F.; Rijsbergen, C.J. van: ¬The retrieval effects of query expansion on a feedback document retrieval system (1983) 0.01 
    0.010347793 = product of:
  0.04139117 = sum of:
    0.04139117 = product of:
      0.08278234 = sum of:
        0.08278234 = weight(_text_:22 in 2134) [ClassicSimilarity], result of:
          0.08278234 = score(doc=2134,freq=2.0), product of:
            0.15283036 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.043643 = queryNorm
            0.5416616 = fieldWeight in 2134, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.109375 = fieldNorm(doc=2134)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
    Date
    30. 3.2001 13:32:22
  8. Back, J.: ¬An evaluation of relevancy ranking techniques used by Internet search engines (2000) 0.01 
    0.010347793 = product of:
  0.04139117 = sum of:
    0.04139117 = product of:
      0.08278234 = sum of:
        0.08278234 = weight(_text_:22 in 3445) [ClassicSimilarity], result of:
          0.08278234 = score(doc=3445,freq=2.0), product of:
            0.15283036 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.043643 = queryNorm
            0.5416616 = fieldWeight in 3445, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.109375 = fieldNorm(doc=3445)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
    Date
    25. 8.2005 17:42:22
  9. Cheng, C.-S.; Chung, C.-P.; Shann, J.J.-J.: Fast query evaluation through document identifier assignment for inverted file-based information retrieval systems (2006) 0.01 
    0.010142221 = product of:
  0.040568884 = sum of:
    0.040568884 = weight(_text_:c in 979) [ClassicSimilarity], result of:
      0.040568884 = score(doc=979,freq=4.0), product of:
        0.1505424 = queryWeight, product of:
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.043643 = queryNorm
        0.2694848 = fieldWeight in 979, product of:
          2.0 = tf(freq=4.0), with freq of:
            4.0 = termFreq=4.0
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.0390625 = fieldNorm(doc=979)
  0.25 = coord(1/4)
  10. Al-Hawamdeh, S.; Smith, G.; Willett, P.; Vere, R. de: Using nearest-neighbour searching techniques to access full-text documents (1991) 0.01 
    0.010127594 = product of:
  0.040510375 = sum of:
    0.040510375 = product of:
      0.08102075 = sum of:
        0.08102075 = weight(_text_:al in 2300) [ClassicSimilarity], result of:
          0.08102075 = score(doc=2300,freq=2.0), product of:
            0.20001286 = queryWeight, product of:
              4.582931 = idf(docFreq=1228, maxDocs=44218)
              0.043643 = queryNorm
            0.4050777 = fieldWeight in 2300, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              4.582931 = idf(docFreq=1228, maxDocs=44218)
              0.0625 = fieldNorm(doc=2300)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
  11. Carpineto, C.; Romano, G.: Information retrieval through hybrid navigation of lattice representations (1996) 0.01 
    0.010040285 = product of:
  0.04016114 = sum of:
    0.04016114 = weight(_text_:c in 7434) [ClassicSimilarity], result of:
      0.04016114 = score(doc=7434,freq=2.0), product of:
        0.1505424 = queryWeight, product of:
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.043643 = queryNorm
        0.2667763 = fieldWeight in 7434, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.0546875 = fieldNorm(doc=7434)
  0.25 = coord(1/4)
  12. Boughanem, M.; Chrisment, C.; Tamine, L.: On using genetic algorithms for multimodal relevance optimization in information retrieval (2002) 0.01 
    0.010040285 = product of:
  0.04016114 = sum of:
    0.04016114 = weight(_text_:c in 1011) [ClassicSimilarity], result of:
      0.04016114 = score(doc=1011,freq=2.0), product of:
        0.1505424 = queryWeight, product of:
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.043643 = queryNorm
        0.2667763 = fieldWeight in 1011, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.0546875 = fieldNorm(doc=1011)
  0.25 = coord(1/4)
  13. Lee, C.; Lee, G.G.: Probabilistic information retrieval model for a dependence structured indexing system (2005) 0.01 
    0.010040285 = product of:
  0.04016114 = sum of:
    0.04016114 = weight(_text_:c in 1004) [ClassicSimilarity], result of:
      0.04016114 = score(doc=1004,freq=2.0), product of:
        0.1505424 = queryWeight, product of:
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.043643 = queryNorm
        0.2667763 = fieldWeight in 1004, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.0546875 = fieldNorm(doc=1004)
  0.25 = coord(1/4)
  14. López-Pujalte, C.; Guerrero-Bote, V.P.; Moya-Anegón, F. de: Genetic algorithms in relevance feedback : a second test and new contributions (2003) 0.01 
    0.010040285 = product of:
  0.04016114 = sum of:
    0.04016114 = weight(_text_:c in 1076) [ClassicSimilarity], result of:
      0.04016114 = score(doc=1076,freq=2.0), product of:
        0.1505424 = queryWeight, product of:
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.043643 = queryNorm
        0.2667763 = fieldWeight in 1076, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.0546875 = fieldNorm(doc=1076)
  0.25 = coord(1/4)
  15. Behnert, C.; Plassmeier, K.; Borst, T.; Lewandowski, D.: Evaluierung von Rankingverfahren für bibliothekarische Informationssysteme (2019) 0.01 
    0.010040285 = product of:
  0.04016114 = sum of:
    0.04016114 = weight(_text_:c in 5023) [ClassicSimilarity], result of:
      0.04016114 = score(doc=5023,freq=2.0), product of:
        0.1505424 = queryWeight, product of:
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.043643 = queryNorm
        0.2667763 = fieldWeight in 5023, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.0546875 = fieldNorm(doc=5023)
  0.25 = coord(1/4)
  16. Fuhr, N.: Ranking-Experimente mit gewichteter Indexierung (1986) 0.01 
    0.008869536 = product of:
  0.035478145 = sum of:
    0.035478145 = product of:
      0.07095629 = sum of:
        0.07095629 = weight(_text_:22 in 58) [ClassicSimilarity], result of:
          0.07095629 = score(doc=58,freq=2.0), product of:
            0.15283036 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.043643 = queryNorm
            0.46428138 = fieldWeight in 58, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.09375 = fieldNorm(doc=58)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
    Date
    14. 6.2015 22:12:44
  17. Fuhr, N.: Rankingexperimente mit gewichteter Indexierung (1986) 0.01 
    0.008869536 = product of:
  0.035478145 = sum of:
    0.035478145 = product of:
      0.07095629 = sum of:
        0.07095629 = weight(_text_:22 in 2051) [ClassicSimilarity], result of:
          0.07095629 = score(doc=2051,freq=2.0), product of:
            0.15283036 = queryWeight, product of:
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.043643 = queryNorm
            0.46428138 = fieldWeight in 2051, product of:
              1.4142135 = tf(freq=2.0), with freq of:
                2.0 = termFreq=2.0
              3.5018296 = idf(docFreq=3622, maxDocs=44218)
              0.09375 = fieldNorm(doc=2051)
      0.5 = coord(1/2)
  0.25 = coord(1/4)
    Date
    14. 6.2015 22:12:56
  18. Cecchini, R.L.; Lorenzetti, C.M.; Maguitman, A.G.; Brignole, N.B.: Multiobjective evolutionary algorithms for context-based search (2010) 0.01 
    0.00860596 = product of:
  0.03442384 = sum of:
    0.03442384 = weight(_text_:c in 3482) [ClassicSimilarity], result of:
      0.03442384 = score(doc=3482,freq=2.0), product of:
        0.1505424 = queryWeight, product of:
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.043643 = queryNorm
        0.22866541 = fieldWeight in 3482, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.046875 = fieldNorm(doc=3482)
  0.25 = coord(1/4)
    Abstract
    Formulating high-quality queries is a key aspect of context-based search. However, determining the effectiveness of a query is challenging because multiple objectives, such as high precision and high recall, are usually involved. In this work, we study techniques that can be applied to evolve contextualized queries when the criteria for determining query quality are based on multiple objectives. We report on the results of three different strategies for evolving queries: (a) single-objective, (b) multiobjective with Pareto-based ranking, and (c) multiobjective with aggregative ranking. After a comprehensive evaluation with a large set of topics, we discuss the limitations of the single-objective approach and observe that both the Pareto-based and aggregative strategies are highly effective for evolving topical queries. In particular, our experiments lead us to conclude that the multiobjective techniques are superior to a baseline as well as to well-known and ad hoc query reformulation techniques.
  19. Biskri, I.; Rompré, L.: Using association rules for query reformulation (2012) 0.01 
    0.00860596 = product of:
  0.03442384 = sum of:
    0.03442384 = weight(_text_:c in 92) [ClassicSimilarity], result of:
      0.03442384 = score(doc=92,freq=2.0), product of:
        0.1505424 = queryWeight, product of:
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.043643 = queryNorm
        0.22866541 = fieldWeight in 92, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.046875 = fieldNorm(doc=92)
  0.25 = coord(1/4)
    Source
    Next generation search engines: advanced models for information retrieval. Eds.: C. Jouis, u.a
  20. Habernal, I.; Konopík, M.; Rohlík, O.: Question answering (2012) 0.01 
    0.00860596 = product of:
  0.03442384 = sum of:
    0.03442384 = weight(_text_:c in 101) [ClassicSimilarity], result of:
      0.03442384 = score(doc=101,freq=2.0), product of:
        0.1505424 = queryWeight, product of:
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.043643 = queryNorm
        0.22866541 = fieldWeight in 101, product of:
          1.4142135 = tf(freq=2.0), with freq of:
            2.0 = termFreq=2.0
          3.4494052 = idf(docFreq=3817, maxDocs=44218)
          0.046875 = fieldNorm(doc=101)
  0.25 = coord(1/4)
    Source
    Next generation search engines: advanced models for information retrieval. Eds.: C. Jouis, u.a

Authors

Years

Languages

  • e 68
  • d 8
  • m 1
  • More… Less…

Types

  • a 72
  • m 3
  • s 3
  • el 2
  • r 1
  • More… Less…

Themes

Subjects

Classifications