-
Gardner, T.; Iannella, R.: Architecture and software solutions (2000)
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- Date
- 22. 6.2002 19:38:24
-
Koch, T.: Quality-controlled subject gateways : definitions, typologies, empirical overview (2000)
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- Date
- 22. 6.2002 19:37:55
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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
-
Fischer, T.; Neuroth, H.: SSG-FI - special subject gateways to high quality Internet resources for scientific users (2000)
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- Date
- 22. 6.2002 19:40:42
-
Large, A.; Beheshti, J.; Rahman, T.: Design criteria for children's Web portals : the users speak out (2002)
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- Date
- 2. 6.2005 10:34:22
-
Nicholson, S.; Sierra, T.; Eseryel, U.Y.; Park, J.-H.; Barkow, P.; Pozo, E.J.; Ward, J.: How much of it is real? : analysis of paid placement in Web search engine results (2006)
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- Date
- 22. 7.2006 16:32:57
-
Bar-Ilan, J.; Gutman,T.: How do search engines respond to some non-English queries? (2005)
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-
MacLeod, R.: Promoting a subject gateway : a case study from EEVL (Edinburgh Engineering Virtual Library) (2000)
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- Date
- 22. 6.2002 19:40:22
-
Back, J.: ¬An evaluation of relevancy ranking techniques used by Internet search engines (2000)
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- Date
- 25. 8.2005 17:42:22
-
Bawden, D.: Google and the universe of knowledge (2008)
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- Date
- 7. 6.2008 16:22:20
-
Haveliwala, T.; Kamvar, S.: ¬The second eigenvalue of the Google matrix (2003)
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- Abstract
- We determine analytically the modulus of the second eigenvalue for the web hyperlink matrix used by Google for computing PageRank. Specifically, we prove the following statement: "For any matrix A=(cP + (1-c)E)**T, where P is an nxn row-stochasticmatrix, E is a nonnegative nxn rank-one row-stochastic matrix, and 0<=c<=1, the second eigenvalue of A has modulus Betrag (Lambda_sub2)<=c. Furthermore, if P has at least two irreducible closed subsets, the second eigenvalue Lambda_sub2 = c." This statement has implications for the convergence rate of the standard PageRank algorithm as the web scales, for the stability of PageRank to perturbations to the link structure of the web, for the detection of Google spammers, and for the design of algorithms to speed up PageRank.
-
Price, A.: Five new Danish subject gateways under development (2000)
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- Date
- 22. 6.2002 19:41:31
-
Kamvar, S.; Haveliwala, T.; Golub, G.: Adaptive methods for the computation of PageRank (2003)
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-
Peereboom, M.: DutchESS : Dutch Electronic Subject Service - a Dutch national collaborative effort (2000)
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- Date
- 22. 6.2002 19:39:23
-
Campbell, D.: Australian subject gateways : political and strategic issues (2000)
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- Date
- 22. 6.2002 19:41:16
-
Dempsey, L.: ¬The subject gateway : experiences and issues based on the emergence of the Resource Discovery Network (2000)
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- Date
- 22. 6.2002 19:36:13
-
Sandler, M.: Disruptive beneficence : the Google Print program and the future of libraries (2005)
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- Pages
- S.5-22
-
Assadi, H.; Beauvisage, T.: ¬A comparative study of six french-speaking Web directories (2003)
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-
Aschoff, F.; Rausch von Traubenberg, E.: Usability von Webportalen und Web-Suchmaschinen im Vergleich (2007)
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- Abstract
- Im Rahmen eines berufspraktischen Studiensemesters bei der T-Online AG (Darmstadt) wurden Suchmaschinen und Portale mit integrierter Suchfunktion hinsichtlich Funktionalität und Usability untersucht. Ausgehend von der von Fauldrath und Kunisch bereits 2005 durchgeführten Untersuchung wurde erneut geprüft, welche Standards sich bei den Suchdienstanbietern etabliert haben und welche Trends erkennbar sind. Der bei der zurückliegenden Evaluation verwendete Kriterienkatalog wurde um einige Kriterien erweitert und als Bewertungsschablone der vorliegenden Evaluation eingesetzt. Besonders wichtig für den Nutzwert eines Suchdienstes ist die Relevanz der Treffer. Der bisher weit verbreitete Weg, entsprechende Spezialsuchen anzubieten, verkompliziert die Benutzung der Suchmaschine erheblich, weshalb auch aufgezeigt wird, welche Strategien die Suchdienste zur besseren Antizipierung des Nutzer-Informationsbedürfnisses bereitstellen. Die somit erzielte verbesserte Einbindung eigener Dienste und Inhalte stellt einen enormen Gewinn dar, da sowohl Nutzer als auch Anbieter gleichermaßen davon profitieren.
-
Ding, L.; Finin, T.; Joshi, A.; Peng, Y.; Cost, R.S.; Sachs, J.; Pan, R.; Reddivari, P.; Doshi, V.: Swoogle : a Semantic Web search and metadata engine (2004)
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