-
Yang, C.C.; Liu, N.: Web site topic-hierarchy generation based on link structure (2009)
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- Abstract
- Navigating through hyperlinks within a Web site to look for information from one of its Web pages without the support of a site map can be inefficient and ineffective. Although the content of a Web site is usually organized with an inherent structure like a topic hierarchy, which is a directed tree rooted at a Web site's homepage whose vertices and edges correspond to Web pages and hyperlinks, such a topic hierarchy is not always available to the user. In this work, we studied the problem of automatic generation of Web sites' topic hierarchies. We modeled a Web site's link structure as a weighted directed graph and proposed methods for estimating edge weights based on eight types of features and three learning algorithms, namely decision trees, naïve Bayes classifiers, and logistic regression. Three graph algorithms, namely breadth-first search, shortest-path search, and directed minimum-spanning tree, were adapted to generate the topic hierarchy based on the graph model. We have tested the model and algorithms on real Web sites. It is found that the directed minimum-spanning tree algorithm with the decision tree as the weight learning algorithm achieves the highest performance with an average accuracy of 91.9%.
- Date
- 22. 3.2009 12:51:47
-
Choi, B.; Peng, X.: Dynamic and hierarchical classification of Web pages (2004)
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- Abstract
- Automatic classification of Web pages is an effective way to organise the vast amount of information and to assist in retrieving relevant information from the Internet. Although many automatic classification systems have been proposed, most of them ignore the conflict between the fixed number of categories and the growing number of Web pages being added into the systems. They also require searching through all existing categories to make any classification. This article proposes a dynamic and hierarchical classification system that is capable of adding new categories as required, organising the Web pages into a tree structure, and classifying Web pages by searching through only one path of the tree. The proposed single-path search technique reduces the search complexity from (n) to (log(n)). Test results show that the system improves the accuracy of classification by 6 percent in comparison to related systems. The dynamic-category expansion technique also achieves satisfying results for adding new categories into the system as required.
-
Ulrich, P.S.: Collaborative Digital Reference Service : Weltweites Projekt (2001)
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- Date
- 20. 4.2002 17:30:22
-
Heo, M.; Hirtle, S.C.: ¬An empirical comparison of visualization tools to assist information retrieval on the Web (2001)
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- Abstract
- The reader of a hypertext document in a web environment, if maximum use of the document is to be obtained, must visualize the overall structure of the paths through the document as well as the document space. Graphic visualization displays of this space, produced to assist in navigation, are classified into four groups, and Heo and Hirtle compare three of these classes as to their effectiveness. Distortion displays expand regions of interest while relatively diminishing the detail of the remaining regions. This technique will show both local detail and global structure. Zoom techniques use a series of increasingly focused displays of smaller and smaller areas, and can reduce cogitative overload, but do not provide an easy movement to other parts of the total space. Expanding outline displays use a tree structure to allow movement through a hierarchy of documents, but if the organization has a wide horizontal structure, or is not particularly hierarchical in nature such display can break down. Three dimensional layouts, which are not evaluated here, place objects by location in three space, providing more information and freedom. However, the space must be represented in two dimensions resulting in difficulty in visually judging depth, size and positioning. Ten students were assigned to each of eight groups composed of viewers of the three techniques and an unassisted control group using either a large (583 selected pages) or a small (50 selected pages) web space. Sets of 10 questions, which were designed to elicit the use of a visualization tool, were provided for each space. Accuracy and time spent were extracted from a log file. Users views were also surveyed after completion. ANOVA shows significant differences in accuracy and time based upon the visualization tool in use. A Tukey test shows zoom accuracy to be significantly less than expanding outline and zoom time to be significantly greater than both the outline and control groups. Size significantly affected accuracy and time, but had no interaction with tool type. While the expanding tool class out performed zoom and distortion, its performance was not significantly different from the control group.
-
Degez, D.; Masse, C.: ¬L'indexation à l'ère d'Internet (2000)
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- Date
- 1. 8.1996 22:01:00
-
Herrmann, C.: Partikulare Konkretion universal zugänglicher Information : Beobachtungen zur Konzeptionierung fachlicher Internet-Seiten am Beispiel der Theologie (2000)
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- Date
- 22. 1.2000 19:29:08
-
Levy, D.M.: Digital libraries and the problem of purpose (2000)
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- Source
- Bulletin of the American Society for Information Science. 26(2000), no.6, Aug/Sept, S.22-25
-
Gersmann, G.; Dörr, M.: ¬Der Server Frühe Neuzeit als Baustein für eine Virtuelle Fachbibliothek Geschichte (2001)
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- Date
- 22. 3.2001 11:57:52
-
Domingue, J.; Motta, E.: PlanetOnto : from news publishing to integrated knowledge management support (2000)
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- Date
- 14. 8.2002 11:47:22
-
Schininà, A.: Literatur im Internet (2001)
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- Source
- Online Mitteilungen. 2001, Nr.70, S.22-36 [=Mitteilungen VÖB 54(2001) H.2/3]
-
Dirks, H.: Lernen im Internet oder mit Gedrucktem? : Eine Untersuchung zeigt: Fernunterrichts-Teilnehmer wollen beides! (2002)
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- Date
- 11. 8.2002 15:05:22
-
Zschunke, P.: Gefährliche Liebesgrüße : Neues Computervirus verbreitet sich rasend schnell - Betriebe fahren Systeme herunter (2000)
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- Date
- 3. 5.1997 8:44:22
-
Somm, F.; Klein, P.: Freispruch für Somm (2000)
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- Date
- 29.12.1999 17:22:13
-
Pipp, E.: E-Psyche - "die umfassendste, kostengünstigste und aktuellste Datenbank im Fachbereich Psychologie"??? (2001)
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- Date
- 20. 1.2002 18:22:30
-
Beck, K.: Zur Bildungsfunktion computervermittelter Kommunikation (2001)
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- Date
- 3.10.2001 15:40:22
-
Bayer, M.: Keine E-Mail soll mehr unbemerkt am FBI vorbeikommen : Die US-Bundespolizei will Abhör-Computer direkt bei den Internet-Anbietern aufbauen - Datenschützer fürchten Missbrauch (2000)
0.02
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- Date
- 17. 7.1996 9:33:22
-
Flemming, A.: Kurzbericht des Vorstandes des Deutschen Bibliotheksverbandes 1998 bis 2001 (2001)
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- Date
- 11. 6.2004 13:22:23
-
Müller, M.: Dem stillen Örtchen kann das Internet nicht das Wasser reichen : Fünf Gründe, weshalb das weltweite Netz nicht hält, was sich seine Anhänger von ihm ökonomisch versprechen (2000)
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- Date
- 17. 7.1996 9:33:22
-
Brahms, E.: Aufbau und Förderung Virtueller Fachbibliotheken durch die Deutsche Forschungsgemeinschaft : Lichtbildvortrag (2001)
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- Date
- 20. 1.2002 19:22:10
-
Eggeling, T.; Kroschel, A.: Alles finden im Web (2000)
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- Date
- 9. 7.2000 14:06:22
