-
Großjohann, K.: Gathering-, Harvesting-, Suchmaschinen (1996)
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- Date
- 7. 2.1996 22:38:41
- Pages
- 22 S
-
Breyer, K.: Kommerz statt Information (2002)
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- Date
- 9. 5.2002 21:21:22
-
Boldi, P.; Santini, M.; Vigna, S.: PageRank as a function of the damping factor (2005)
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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
-
Müller-Wolf, K.: (Alb-)Traum der virtuellen Bücherwelt : Internet-Unternehmen Google möchte weltumspannende digitale Bibliothek schaffen (2005)
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- Content
- "Das gesamte Wissen der Welt, das in honorigen Bibliotheken rund um den Globus gehütet wird, ist nur einen Maus-Klick entfernt. Google, das führende Internet-Suchmaschinen-Unternehmen aus den Vereinigten Staaten, möchte den Traum einer universellen Bibliothek verwirklichen. Aber für Autoren und Verlage stellt sich das Vorhaben eher als Albtraum dar. Sie sehen Urheberrechte und ihre Pfründe in Gefahr. Googles neuer Geschäftszweig "Print" ist unterteilt in ein Verlagsprogramm, bei dem Bücher von Verlagen gezielt beworben werden können, und das umstrittene Bibliotheksprogramm. Das Unternehmen möchte 15 Millionen Bücher aus den Beständen der renommierten Universitätsbibliotheken Harvard, Stanford, Oxford, Michigan und der öffentlichen Bibliothek New Yorks über den Index seiner Suchmaschine teilweise verfügbar machen. Seit Dezember läuft die Testphase von "Google Print". Benutzer können online nach einem bestimmten Buchtitel oder Begriff suchen. Google stellt bei Übereinstimmungen mit dem Suchbegriff eine Verknüpfung zu diesem Buch her. Öffentlich zugängliche Bücher, die nicht mehr urheberrechtlich geschützt sind, können vollständig, alle anderen nur auf maximal drei Seiten eingesehen werden. Google verweist auf bibliografische Daten, auf Bibliotheken, in den das Buch ausgeliehen oder einen Online-Buchhändler, bei dem es gekauft werden kann. Glaubt man dem Unternehmen, dann verfolgt es mit dem Bibliotheksprojekt nur hehre Ziele: Bei der Suche nach Büchern zu helfen, die woanders nicht zu finden sind und langfristig mit Autoren und Verlegern einen umfassenden, virtuellen Katalog aller Bücher aller Sprachen zu erstellen. Autoren, aber auch Verleger haben an dieser, Version erhebliche Zweifel. "Authors Guild", eine Vereinigung amerikanischer Autoren, hat im September beim Bezirksgericht Manhattan Klage eingereicht. Mit der Übernahme eines Buches in eine Bibilothek werde dieses nicht zum Teil eines Allgemeinguts. Die Erstellung von elektronischen Kopien bedeute eine massive und fortgesetzte Urheberrechtsverletzung. Auch der Amerikanische, Verband der Buchverlege, die "Association of American Publishers" hat sich der Klage angeschlossen. ,Google verletze die Urheberrechte der Verlage, um seine eigenen kommerziellen Interessen voranzutreiben. In der Buchbranche wird nämlich vermutet, dass Google langfristig selbst in den Buchhandel einsteigen könnte, wie Daniel Lenz, Redakteur des "buchreports" sagt. Leidtragende der neuen Entwicklung sei der stationäre Buchhandel, dem langfristig die Kunden fehlen würden.
- Date
- 3. 5.1997 8:44:22
-
Williamson, N.J.: Knowledge structures and the Internet : progress and prospects (2006)
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- Date
- 27.12.2008 15:56:22
- Source
- Knowledge organization for a global learning society: Proceedings of the 9th International ISKO Conference, 4-7 July 2006, Vienna, Austria. Hrsg.: G. Budin, C. Swertz u. K. Mitgutsch
-
Lewandowski, D.; Sünkler, S.: What does Google recommend when you want to compare insurance offerings? (2019)
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- Abstract
- Purpose The purpose of this paper is to describe a new method to improve the analysis of search engine results by considering the provider level as well as the domain level. This approach is tested by conducting a study using queries on the topic of insurance comparisons. Design/methodology/approach The authors conducted an empirical study that analyses the results of search queries aimed at comparing insurance companies. The authors used a self-developed software system that automatically queries commercial search engines and automatically extracts the content of the returned result pages for further data analysis. The data analysis was carried out using the KNIME Analytics Platform. Findings Google's top search results are served by only a few providers that frequently appear in these results. The authors show that some providers operate several domains on the same topic and that these domains appear for the same queries in the result lists. Research limitations/implications The authors demonstrate the feasibility of this approach and draw conclusions for further investigations from the empirical study. However, the study is a limited use case based on a limited number of search queries. Originality/value The proposed method allows large-scale analysis of the composition of the top results from commercial search engines. It allows using valid empirical data to determine what users actually see on the search engine result pages.
- Date
- 20. 1.2015 18:30:22
-
Phipps, S.E.; Maloney, K.: Choices in the paradigm shift : where next for libraries? (2005)
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- Abstract
- External factors are forcing libraries to seriously evaluate and redefine their purpose within higher education. Libraries have identified themselves as gateways to information. Google, and other Internet search tools, have changed the need and importance of the gatekeeper role in libraries. The authors argue that libraries have a role that is broader than that of gatekeeper. It is necessary to move beyond our existing mental models and truly redefine our unique role based on the needs within the external environment. To develop this broader role, libraries must develop collaborative relationships and leverage existing tools and services.
-
Chaudiron, S.; Ihadjadene, M.: Studying Web search engines from a user perspective : key concepts and main approaches (2012)
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- Abstract
- This chapter shows that the wider use of Web search engines, reconsidering the theoretical and methodological frameworks to grasp new information practices. Beginning with an overview of the recent challenges implied by the dynamic nature of the Web, this chapter then traces the information behavior related concepts in order to present the different approaches from the user perspective. The authors pay special attention to the concept of "information practice" and other related concepts such as "use", "activity", and "behavior" largely used in the literature but not always strictly defined. The authors provide an overview of user-oriented studies that are meaningful to understand the different contexts of use of electronic information access systems, focusing on five approaches: the system-oriented approaches, the theories of information seeking, the cognitive and psychological approaches, the management science approaches, and the marketing approaches. Future directions of work are then shaped, including social searching and the ethical, cultural, and political dimensions of Web search engines. The authors conclude considering the importance of Critical theory to better understand the role of Web Search engines in our modern society.
- Date
- 20. 4.2012 13:22:37
-
Mukherjea, S.; Hirata, K.; Hara, Y.: Towards a multimedia World-Wide Web information retrieval engine (1997)
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- Date
- 1. 8.1996 22:08:06
-
Bouidghaghen, O.; Tamine, L.: Spatio-temporal based personalization for mobile search (2012)
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- Abstract
- The explosion of the information available on the Internet has made traditional information retrieval systems, characterized by one size fits all approaches, less effective. Indeed, users are overwhelmed by the information delivered by such systems in response to their queries, particularly when the latter are ambiguous. In order to tackle this problem, the state-of-the-art reveals that there is a growing interest towards contextual information retrieval (CIR) which relies on various sources of evidence issued from the user's search background and environment, in order to improve the retrieval accuracy. This chapter focuses on mobile context, highlights challenges they present for IR, and gives an overview of CIR approaches applied in this environment. Then, the authors present an approach to personalize search results for mobile users by exploiting both cognitive and spatio-temporal contexts. The experimental evaluation undertaken in front of Yahoo search shows that the approach improves the quality of top search result lists and enhances search result precision.
- Date
- 20. 4.2012 13:19:22
-
Patzwaldt, K.: Google Inside (2005)
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- Date
- 10. 6.2005 17:43:22
- Source
- ¬Die Google-Gesellschaft: Vom digitalen Wandel des Wissens. Hrsg.: K. Lehmann, M. Schetsche
-
Li, L.; Shang, Y.; Zhang, W.: Improvement of HITS-based algorithms on Web documents
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- Content
- Vgl.: http%3A%2F%2Fdelab.csd.auth.gr%2F~dimitris%2Fcourses%2Fir_spring06%2Fpage_rank_computing%2Fp527-li.pdf. Vgl. auch: http://www2002.org/CDROM/refereed/643/.
-
Höfer, W.: Detektive im Web (1999)
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ap: Suchmaschinen in neuem Gewand : Metaspinner kennt 600 Millionen Seiten (1999)
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