-
Lewandowski, D.: ¬Die Macht der Suchmaschinen und ihr Einfluss auf unsere Entscheidungen (2014)
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- Date
- 22. 9.2014 18:54:11
- Source
- Information - Wissenschaft und Praxis. 65(2014) H.4/5, S.231-238
-
Lewandowski, D.: Alles nur noch Google? : Entwicklungen im Bereich der WWW-Suchmaschinen (2002)
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- Date
- 29. 9.2002 18:49:22
-
Lewandowski, D.: Abfragesprachen und erweiterte Funktionen von WWW-Suchmaschinen (2004)
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- Date
- 28.11.2004 13:11:22
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Lewandowski, D.: Query understanding (2011)
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- Date
- 18. 9.2018 18:22:18
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Lewandowski, D.: Suchmaschinen (2013)
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- Date
- 5. 4.2013 14:02:46
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Lewandowski, D.; Haustein, S.: What does the German-language information science community cite? (2015)
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- Date
- 5. 6.2016 19:56:32
-
Lewandowski, D.: Informationsarmut : sowohl ein quantitatives als auch ein qualitatives Problem (1999)
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- Source
- Bibliothek: Forschung und Praxis. 23(1999) H.1, S.5-13
-
Lewandowski, D.: Aktualität als erfolgskritischer Faktor bei Suchmaschinen (2006)
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- Date
- 5. 7.2006 9:32:53
-
Lewandowski, D.; Spree, U.: Ranking of Wikipedia articles in search engines revisited : fair ranking for reasonable quality? (2011)
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- Date
- 30. 9.2012 19:27:22
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Lewandowski, D.; Sünkler, S.: What does Google recommend when you want to compare insurance offerings? (2019)
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- Date
- 20. 1.2015 18:30:22
-
Lewandowski, D.: Nachweis deutschsprachiger bibliotheks- und informationswissenschaftlicher Aufsätze in Google Scholar (2007)
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- Date
- 5. 5.2007 19:48:39
-
Sundin, O.; Lewandowski, D.; Haider, J.: Whose relevance? : Web search engines as multisided relevance machines (2022)
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- Source
- Journal of the Association for Information Science and Technology. 73(2022) no.5, S.637-642
-
Lewandowski, D.: Bewertung von linktopologischen Verfahren als bestimmender Ranking-Faktor bei WWW Suchmaschinen (2006)
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- Source
- Wissensorganisation und Verantwortung: Gesellschaftliche, ökonomische und technische Aspekte. Proceedings der 9. Tagung der Deutschen Sektion der Internationalen Gesellschaft für Wissensorganisation Duisburg, 5.-7. November 2004. Hrsg. von H.P. Ohly u.a
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Lewandowski, D.: How can library materials be ranked in the OPAC? (2009)
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- Content
- Vortrag, anlässlich der 9. Internationalen Bielefeld-Konferenz 2009, 3. - 5. Februar 2009.
-
Schaer, P.; Mayr, P.; Sünkler, S.; Lewandowski, D.: How relevant is the long tail? : a relevance assessment study on million short (2016)
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- Footnote
- To appear in Experimental IR Meets Multilinguality, Multimodality, and Interaction. 7th International Conference of the CLEF Association, CLEF 2016, \'Evora, Portugal, September 5-8, 2016.
-
Behnert, C.; Lewandowski, D.: ¬A framework for designing retrieval effectiveness studies of library information systems using human relevance assessments (2017)
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- Abstract
- Purpose This paper demonstrates how to apply traditional information retrieval evaluation methods based on standards from the Text REtrieval Conference (TREC) and web search evaluation to all types of modern library information systems including online public access catalogs, discovery systems, and digital libraries that provide web search features to gather information from heterogeneous sources. Design/methodology/approach We apply conventional procedures from information retrieval evaluation to the library information system context considering the specific characteristics of modern library materials. Findings We introduce a framework consisting of five parts: (1) search queries, (2) search results, (3) assessors, (4) testing, and (5) data analysis. We show how to deal with comparability problems resulting from diverse document types, e.g., electronic articles vs. printed monographs and what issues need to be considered for retrieval tests in the library context. Practical implications The framework can be used as a guideline for conducting retrieval effectiveness studies in the library context. Originality/value Although a considerable amount of research has been done on information retrieval evaluation, and standards for conducting retrieval effectiveness studies do exist, to our knowledge this is the first attempt to provide a systematic framework for evaluating the retrieval effectiveness of twenty-first-century library information systems. We demonstrate which issues must be considered and what decisions must be made by researchers prior to a retrieval test.
-
Lewandowski, D.: Web Information Retrieval (2005)
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- Source
- Information - Wissenschaft und Praxis. 56(2005) H.1, S.5-12
-
Lewandowski, D.: Wikipedia in großen Suchmaschinen (2005)
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- Source
- Password. 2005, H.5, S.21,29
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Lewandowski, D.: Web Information Retrieval : Technologien zur Informationssuche im Internet (2005)
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- Content
- Inhalt: 1 Einleitung 2 Forschungsumfeld 2.1 Suchmaschinen-Markt 2.2 Formen der Suche im WWW 2.3 Aufbau algorithmischer Suchmaschinen 2.4 Abfragesprachen 2.5 Arten von Suchanfragen 2.6 Nutzerstudien 2.7 Forschungsbereiche 3 Die Größe des Web und seine Abdeckung durch Suchmaschinen 3.1 Die Größe des indexierbaren Web 3.2 Die Struktur des Web 3.3 Crawling 3.4 Aktualität der Suchmaschinen 3.5 Das Invisible Web 4 Strukturinformationen 4.1 Strukturierungsgrad von Dokumenten 4.2 Strukturinformationen in den im Web gängigen Dokumenten 4.3 Trennung von Navigation, Layout und Inhalt 4.4 Repräsentation der Dokumente in den Datenbanken der Suchmaschinen 5 Klassische Verfahren des Information Retrieval und ihre Anwendung bei WWW-Suchmaschinen 5.1 Unterschiede zwischen klassischem Information Retrieval und Web Information Retrieval 5.2 Kontrolliertes Vokabular 5.3 Kriterien für die Aufnahme in den Datenbestand 5.4 Modelle des Information Retrieval 6 Ranking 6.1 Rankingfaktoren 6.2 Messbarkeit von Relevanz 6.3 Grundsätzliche Probleme des Relevance Ranking in Suchmaschinen
