-
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
-
Falquet, G.; Guyot, J.; Nerima, L.: Languages and tools to specify hypertext views on databases (1999)
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- Abstract
- We present a declarative language for the construction of hypertext views on databases. The language is based on an object-oriented data model and a simple hypertext model with reference and inclusion links. A hypertext view specification consists in a collection of parameterized node schemes which specify how to construct node and links instances from the database contents. We show how this language can express different issues in hypertext view design. These include: the direct mapping of objects to nodes; the construction of complex nodes based on sets of objects; the representation of polymorphic sets of objects; and the representation of tree and graph structures. We have defined sublanguages corresponding to particular database models (relational, semantic, object-oriented) and implemented tools to generate Web views for these database models
- Date
- 21.10.2000 15:01:22
-
Savoy, J.; Desbois, D.: Information retrieval in hypertext systems (1991)
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- Abstract
- The emphasis in most hypertext systems is on the navigational methods, rather than on the global document retrieval mechanisms. When a search mechanism is provided, it is often restricted to simple string matching or to the Boolean model (as an alternate method). proposes a retrieval mechanism using Bayesian inference networks. The main contribution of this approach is the automatic construction of this network using the expected mutual information measure to build the inference tree, and using Jaccard's formula to define fixed conditional probability relationships
-
Robinson, L.; Maguire, M.: ¬The rhizome and the tree : changing metaphors for information organisation (2010)
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-
Schreiweis, U.: Hypertextstrukturen als Grundlage für integrierte Wissensakquisitionssysteme (1993)
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- Date
- 19.10.1995 10:22:53
-
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.
-
Aßfalg, R.: Integration eines offenen Hypertextsystems in den Internet-Mehrwertdienst World Wide Web : ein Ansatz unter Verwendung eines objektorientierten Datenbanksystems (1996)
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- Date
- 22. 2.1997 19:40:31
-
Menges, T.: Möglichkeiten und Grenzen der Übertragbarkeit eines Buches auf Hypertext am Beispiel einer französischen Grundgrammatik (Klein; Kleineidam) (1997)
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- Date
- 22. 7.1998 18:23:25
-
Tergan, S.-O.: Zum Aufbau von Wissensstrukturen mit Texten und Hypertexten (1993)
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- Source
- Nachrichten für Dokumentation. 44(1993) H.1, S.15-22
-
Griffith, C.: What's all the hype about hypertext? (1989)
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- Source
- Information today. 6(1989) no.4, S.22-24
-
Welsch, L.A.: Multimedia and hypermedia : model and framework (1993)
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- Footnote
- Part of a special issue featuring papers from the workshop on hypermedia and hypertext standards held in Amsterdam, Netherlands, 22-23 April 1993
-
Rada, R.: Hypertext and paper : a special synergy (1991)
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- Source
- International journal of information management. 11(1991) no.1, S.14-22
-
Papers from the workshop on hypermedia and hypertext standards held in Amsterdam, Netherlands, 22-23 April 1993 (1993)
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-
Gabbard, R.: Recent literature shows accelerated growth in hypermedia tools : an annotated bibliography (1994)
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- Source
- Reference services review. 22(1994) no.2, S.31-40
-
Dimitroff, A.; Wolfram, D.: Searcher response in a hypertext-based bibliographic information retrieval system (1995)
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- Source
- Journal of the American Society for Information Science. 46(1995) no.1, S.22-29
-
Smith, L.C.: "Wholly new forms of encyclopedias" : electronic knowledge in the form of hypertext (1989)
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- Date
- 7. 1.1996 22:47:52
-
Ramarapu, N.: ¬The impact of hypertext versus sequential information presentation on decision making : a conceptual model (1996)
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- Date
- 24.10.1996 19:57:22
-
Hammwöhner, R.: Offene Hypertextsysteme : Das Konstanzer Hypertextsystem (KHS) im wissenschaftlichen und technischen Kontext (1997)
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- Date
- 17. 7.2002 16:22:13
-
Spertus, E.: ParaSite : mining structural information on the Web (1997)
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- Date
- 1. 8.1996 22:08:06
-
Diaz, P.; Aedo, I.; Panetsos, F.: Labyrinth, an abstract model for hypermedia applications : Description of its static components (1997)
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- Source
- Information systems. 22(1997) no.8, S.447-464
