-
Mayr, P.; Schaer, P.; Mutschke, P.: ¬A science model driven retrieval prototype (2011)
0.02
0.024286052 = product of:
0.09714421 = sum of:
0.09714421 = weight(_text_:services in 649) [ClassicSimilarity], result of:
0.09714421 = score(doc=649,freq=10.0), product of:
0.17850377 = queryWeight, product of:
3.6713707 = idf(docFreq=3057, maxDocs=44218)
0.04862047 = queryNorm
0.5442138 = fieldWeight in 649, product of:
3.1622777 = tf(freq=10.0), with freq of:
10.0 = termFreq=10.0
3.6713707 = idf(docFreq=3057, maxDocs=44218)
0.046875 = fieldNorm(doc=649)
0.25 = coord(1/4)
- Abstract
- This paper is about a better understanding of the structure and dynamics of science and the usage of these insights for compensating the typical problems that arises in metadata-driven Digital Libraries. Three science model driven retrieval services are presented: co-word analysis based query expansion, re-ranking via Bradfordizing and author centrality. The services are evaluated with relevance assessments from which two important implications emerge: (1) precision values of the retrieval services are the same or better than the tf-idf retrieval baseline and (2) each service retrieved a disjoint set of documents. The different services each favor quite other - but still relevant - documents than pure term-frequency based rankings. The proposed models and derived retrieval services therefore open up new viewpoints on the scientific knowledge space and provide an alternative framework to structure scholarly information systems.
-
Mayr, P.; Mutschke, P.; Petras, V.; Schaer, P.; Sure, Y.: Applying science models for search (2010)
0.01
0.014481404 = product of:
0.057925615 = sum of:
0.057925615 = weight(_text_:services in 4663) [ClassicSimilarity], result of:
0.057925615 = score(doc=4663,freq=2.0), product of:
0.17850377 = queryWeight, product of:
3.6713707 = idf(docFreq=3057, maxDocs=44218)
0.04862047 = queryNorm
0.3245064 = fieldWeight in 4663, product of:
1.4142135 = tf(freq=2.0), with freq of:
2.0 = termFreq=2.0
3.6713707 = idf(docFreq=3057, maxDocs=44218)
0.0625 = fieldNorm(doc=4663)
0.25 = coord(1/4)
- Abstract
- The paper proposes three different kinds of science models as value-added services that are integrated in the retrieval process to enhance retrieval quailty. The paper discusses the approaches Search Term Recommendation, Bradfordizing and Author Centrality on a general level and addresses implementation issues of the models within a real-life retrieval environment.
-
Schaer, P.: Integration von Open-Access-Repositorien in Fachportale (2010)
0.01
0.0057639773 = product of:
0.02305591 = sum of:
0.02305591 = product of:
0.04611182 = sum of:
0.04611182 = weight(_text_:22 in 2320) [ClassicSimilarity], result of:
0.04611182 = score(doc=2320,freq=2.0), product of:
0.17026061 = queryWeight, product of:
3.5018296 = idf(docFreq=3622, maxDocs=44218)
0.04862047 = queryNorm
0.2708308 = fieldWeight in 2320, 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=2320)
0.5 = coord(1/2)
0.25 = coord(1/4)
- Source
- Wissensspeicher in digitalen Räumen: Nachhaltigkeit - Verfügbarkeit - semantische Interoperabilität. Proceedings der 11. Tagung der Deutschen Sektion der Internationalen Gesellschaft für Wissensorganisation, Konstanz, 20. bis 22. Februar 2008. Hrsg.: J. Sieglerschmidt u. H.P.Ohly