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  • × type_ss:"el"
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  1. Boldi, P.; Santini, M.; Vigna, S.: PageRank as a function of the damping factor (2005) 0.05 
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    Abstract
    PageRank is defined as the stationary state of a Markov chain. The chain is obtained by perturbing the transition matrix induced by a web graph with a damping factor alpha that spreads uniformly part of the rank. The choice of alpha is eminently empirical, and in most cases the original suggestion alpha=0.85 by Brin and Page is still used. Recently, however, the behaviour of PageRank with respect to changes in alpha was discovered to be useful in link-spam detection. Moreover, an analytical justification of the value chosen for alpha is still missing. In this paper, we give the first mathematical analysis of PageRank when alpha changes. In particular, we show that, contrarily to popular belief, for real-world graphs values of alpha close to 1 do not give a more meaningful ranking. Then, we give closed-form formulae for PageRank derivatives of any order, and an extension of the Power Method that approximates them with convergence O(t**k*alpha**t) for the k-th derivative. Finally, we show a tight connection between iterated computation and analytical behaviour by proving that the k-th iteration of the Power Method gives exactly the PageRank value obtained using a Maclaurin polynomial of degree k. The latter result paves the way towards the application of analytical methods to the study of PageRank.
    Date
    16. 1.2016 10:22:28
  2. Knorz, G.; Rein, B.: Semantische Suche in einer Hochschulontologie : Ontologie-basiertes Information-Filtering und -Retrieval mit relationalen Datenbanken (2005) 0.04 
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    Abstract
    Ontologien werden eingesetzt, um durch semantische Fundierung insbesondere für das Dokumentenretrieval eine grundlegend bessere Basis zu haben, als dies gegenwärtiger Stand der Technik ist. Vorgestellt wird eine an der FH Darmstadt entwickelte und eingesetzte Ontologie, die den Gegenstandsbereich Hochschule sowohl breit abdecken und gleichzeitig differenziert semantisch beschreiben soll. Das Problem der semantischen Suche besteht nun darin, dass sie für Informationssuchende so einfach wie bei gängigen Suchmaschinen zu nutzen sein soll, und gleichzeitig auf der Grundlage des aufwendigen Informationsmodells hochwertige Ergebnisse liefern muss. Es wird beschrieben, welche Möglichkeiten die verwendete Software K-Infinity bereitstellt und mit welchem Konzept diese Möglichkeiten für eine semantische Suche nach Dokumenten und anderen Informationseinheiten (Personen, Veranstaltungen, Projekte etc.) eingesetzt werden.
    Date
    11. 2.2011 18:22:25
    Object
    K-Infinity
  3. Boleda, G.; Evert, S.: Multiword expressions : a pain in the neck of lexical semantics (2009) 0.03 
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    Date
    1. 3.2013 14:56:22
  4. Qin, J.; Paling, S.: Converting a controlled vocabulary into an ontology : the case of GEM (2001) 0.03 
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    Date
    24. 8.2005 19:20:22
  5. Leth, P.: Subject access - the Swedish approach (2007) 0.03 
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    Content
    Vortrag anlässlich des Workshops: "Extending the multilingual capacity of The European Library in the EDL project Stockholm, Swedish National Library, 22-23 November 2007".
    Location
    S
  6. Kottmann, N.; Studer, T.: Improving semantic query answering (2006) 0.03 
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    Abstract
    The retrieval problem is one of the main reasoning tasks for knowledge base systems. Given a knowledge base K and a concept C, the retrieval problem consists of finding all individuals a for which K logically entails C(a). We present an approach to answer retrieval queries over (a restriction of) OWL ontologies. Our solution is based on reducing the retrieval problem to a problem of evaluating an SQL query over a database constructed from the original knowledge base. We provide complete answers to retrieval problems. Still, our system performs very well as is shown by a standard benchmark.
    Pages
    10 S
  7. Grimm, J.; Grimm, W.: Deutsches Wörterbuch - Der digitale Grimm : Elektronische Ausgabe der Erstbearbeitung (2004) 0.02 
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    Date
    22. 7.2004 9:54:37
    Footnote
    Vgl. auch: Trauth-Marx, D.M.: "Die Sprache ist allen bekannt - und ein Geheimnis": Vor 150 Jahren erschien der erste Band des Deutschen Wörterbuches von Jakob und Wilhelm Grimm. In: Die Rheinpfalz. Nr. 165 vom 19.7.2004, S.01_Kult.
    Pages
    131 S. + Benutzerhandbuch + 2 CD-ROMs
  8. Wen, D.; Sakaguchi, T.; Sugimoto, S.; Tabata, K.: Multilingual Access to Dublin Core Metadata of ULIS Library (2002) 0.02 
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  9. Poggendorff, J.C.: Biographisch-literarisches Handwörterbuch der exakten Naturwissenschaften (2000) 0.02 
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    Date
    3. 4.1996 15:41:22
    Footnote
    Rez. in: Online Mitteilungen 2001, Nr.70, S.64-69 (H. Hauffe u. E. Pipp)
  10. Mayr, P.; Walter, A.-K.: Einsatzmöglichkeiten von Crosskonkordanzen (2007) 0.02 
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    Content
    Auch in: Lokal-Global: Vernetzung wissenschaftlicher Infrastrukturen; 12. Kongress der IuK-Initiative der Wissenschaftlichen Fachgesellschaft in Deutschland, Tagungsberichte, GESIS-IZ Sozialwissenschaft, Bonn, S.149-166.
  11. Faro, S.; Francesconi, E.; Marinai, E.; Sandrucci, V.: Report on execution and results of the interoperability tests (2008) 0.02 
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    Date
    7.11.2008 10:40:22
  12. Henrich, A.: Information Retrieval : Grundlagen, Modelle und Anwendungen (2008) 0.02 
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    Date
    22. 8.2015 21:23:08
    Pages
    421 S
  13. Understanding metadata (2004) 0.02 
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    Date
    10. 9.2004 10:22:40
    Pages
    20 S
  14. Faro, S.; Francesconi, E.; Sandrucci, V.: Thesauri KOS analysis and selected thesaurus mapping methodology on the project case-study (2007) 0.02 
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    Date
    7.11.2008 10:40:22
  15. Kim, K.-S.; Kim, S.-C.J.; Park, S.-J.; Zhu, X.; Polparsi, J.: Facet analyses of categories used in Web directories : a comparative study (2006) 0.02 
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  16. Sparck Jones, K.: Summary performance comparisons TREC-2 through TREC-8 (2001) 0.02 
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  17. Hegna, K.: Using FRBR (2004) 0.02 
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  18. Mayr, P.; Walter, A.-K.: Zum Stand der Heterogenitätsbehandlung in vascoda : Bestandsaufnahme und Ausblick (2007) 0.02 
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    Content
    Vortrag anlässlich des 96. Deutscher Bibliothekartag, Leipzig, 2007. - Vgl. auch den Bericht: Fiala, S.: Deutscher Bibliothekartag Leipzig 2007: Sacherschließung - Informationsdienstleistung. In: Mitt. VOEB 60(2007) H.2, S.44-48.
  19. Wegner, B.: Mathematik im Blickpunkt : Wissensmanagement in der Mathematik - 140 Jahre Information zur Literatur weltweit (2008) 0.02 
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    Content
    Inhalt: Mathematik im Web: die Informationsdienste von FIZ Karlsruhe/Zentralblatt MATH - eine Bestandsaufnahme - O. Ninnemann Die Anfänge des Wissensmanagements in der Mathematik: das "Jahrbuch über die Fortschritte der Mathematik" - S. Göbel Mathematik-Information im Wechsel der Zeiten und politischen Systeme - B. Wegner MathEduc - Informationen zum Lernen und Lehren von Mathematik - B. Ruffer-Henn, B. Wegner Die WDML - Ideen und Wirklichkeit - B. Wegner Über Suchmaschinen und Datenbanken - W. Sperber Der Mathematiker Wolfgang Doeblin (1915-1940) - Recherchen im Internet - S. Göbel Kryptographie und Turing-Maschinen - E Rossi Wo spielt die Musik im Zentralblatt? Recherchen am Rande der Mathematik - K.-D. Kiermeier Vom Vierfarbenproblem zum Vierfarbensatz - eine Analyse mit Hilfe des Zentralblatt MATH - H. Kröger
  20. Umlauf, K.: Grundkurs Informationsaufbereitung : Vorlesungsskript (2009) 0.02 
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    Pages
    47 S

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