Search (4 results, page 1 of 1)

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Abstract

Suchmaschinen sind der wichtigste Zugangsweg zum Auffinden neuer Netzinhalte. Insgesamt verwendeten nach einer repräsentativen Studie im dritten Quartal 2005 fast 85 Prozent der deutschen Internetnutzer Suchmaschinen. Diese sind inzwischen auch ein Big Business: Gemessen am Börsenwert ist die Suchmaschine Google mit einem Gesamtwert von 80 Mrd. Dollar das wertvollste Medienunternehmen der Welt. Der Konzerngewinn stieg von 2004 auf 2005 um 367 Prozent auf 1,5 Mrd. Dollar. Als Gatekeeper im Internet stellen die Suchmaschinen eine zentrale Herausforderung für Wissenschaft und Forschung dar - letztlich geht es um die Frage der "digitalen Informationsmacht". Mit diesem Band liegt erstmals eine Publikation vor, die die Rolle von Suchmaschinen in der Informationsgesellschaft in den wichtigsten Dimensionen aus verschiedenen Perspektiven wissenschaftlich beleuchtet und dabei hilft, die künftige Suchmaschinenforschung zu systematisieren.

Date

7. 4.2008 21:41:29

RSWK

Suchmaschine / Regulierung / Marktmacht / Aufsatzsammlung
Suchmaschine / Journalismus / Aufsatzsammlung
Suchmaschine / Benutzerverhalten / Aufsatzsammlung

Subject

Suchmaschine / Regulierung / Marktmacht / Aufsatzsammlung
Suchmaschine / Journalismus / Aufsatzsammlung
Suchmaschine / Benutzerverhalten / Aufsatzsammlung

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Abstract

A modern information retrieval system must have the capability to find, organize and present very different manifestations of information - such as text, pictures, videos or database records - any of which may be of relevance to the user. However, the concept of relevance, while seemingly intuitive, is actually hard to define, and it's even harder to model in a formal way. Lavrenko does not attempt to bring forth a new definition of relevance, nor provide arguments as to why any particular definition might be theoretically superior or more complete. Instead, he takes a widely accepted, albeit somewhat conservative definition, makes several assumptions, and from them develops a new probabilistic model that explicitly captures that notion of relevance. With this book, he makes two major contributions to the field of information retrieval: first, a new way to look at topical relevance, complementing the two dominant models, i.e., the classical probabilistic model and the language modeling approach, and which explicitly combines documents, queries, and relevance in a single formalism; second, a new method for modeling exchangeable sequences of discrete random variables which does not make any structural assumptions about the data and which can also handle rare events. Thus his book is of major interest to researchers and graduate students in information retrieval who specialize in relevance modeling, ranking algorithms, and language modeling.

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Date

22. 2.2013 11:34:18

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