Search (153 results, page 1 of 8)

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Abstract

Presents a 3 facet adaptive authoring model for online hypermedia information systems. It provides spatial reconfiguration of the presentation objects based on activation frequency, information content customization based on author specified criteria, and hypergraphic network optimization based on usage. Discusses the theory underlying the model, its architecture and hypermedia structure, and provides a preliminary quantitative measure and evaluation of its impact on authoring time, as well as study time

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Abstract

The aim of probabilistic models is to define a retrieval strategy within which documents can be optimally ranked according to their relevance probability with respect to a given request. Presents a study which suggests representing documents not only by index term vendors, as proposed by previous probabilistic models but also by considering relevance hypertext links. To enhance retrieval effectiveness, the learning retrieval scheme should modify the weight assigned to each indexing terms, the importance attached to each search term, and the relationships between documents. Evaluation of the proposed retrieval scheme with a hypertext based on the CACM test collection which includes 3.204 documents and the CISI corpus (1,460 documents), yields interesting results on the retrieval effectiveness of this approach

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Abstract

This paper introduces the notion of physical hypermedia, addressing the problem of organizing material in mixed digital and physical environments. Based on empirical studies, we propose concepts for collectional actions and meta-data actions, and present prototypes combining principles from augmented reality and hypermedia to support organization of mixtures of digital and physical materials. Our prototype of a physical hypermedia system is running on an augmented architect's desk and digital walls utilizing Radio Frequency Identifier (RFID) tags as well as visual tags tracked by cameras. It allows users to tag physical materials, and have these tracked by readers (antennas) that may become pervasive in our work environments. In the physical hypermedia system, we work with three categories of RFID tags: simple object tags, collectional tags, and tooltags invoking operations such as grouping and linking of physical material. In addition, we utilize visual ARToolKit tags for linking and navigating 3D models on a physical desk. Our primary application domain is architecture and design, and so we discuss the use of augmented collectional artifacts primarily for this domain.

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Abstract

Describes an integrated approach to similarity coefficients for information spaces with multiple dimensions of different types of index term. Categorises applications of similarity coefficients underlying different navigation tools in hypermedia by type of term. Describes an implementation of a unified similarity coefficient based on work in numerical taxonomy, with illustrative scenarios from an experimental navigation via similarity tool for a prototype social history museum hypermedia system. The underlying architecture is based on a semantic approach, where semantic relationships can exist between index terms. This allows imprecise matching when comparing for similarity, with distance measures yielding a degree of match. A ranked list of matching items over several weighted dimensions is returned by the similarity navigation tool. The approach has the potential of allowing different access methods to multimedia data to be combined

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Abstract

Reports on research which aims to discover the path patterns through which users retrieve information in hypertext systems. Takes a pragmatic approach in which the use of a hypertext information retrieval system by a group of subjects was monitored to collect path pattern data. Two frequency distribution models were developed and tested using these data. Path length followed a shifted negative minimal distribution. The influence of search tasks on path patterns was examined and found to have no effect. These models can provide a background for examination of systems via stimulation studies

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Abstract

Examnies several feasibility issues and initial design considerations for a hypertext system for structured bibliographic retrieval. HyperLynx was developed using Asymmetric Toolbox. By combining searchable term indexes and inter-record linkages between common authors and descriptors, a flexible search environment is established conductive to browsing

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Abstract

Assessment tests and practical experiences have lead to design guidelines for hypertext systems. A library information system was tested twice by potential users. Presents guidelines with regards to user groups, browsing and navigation through the system, structure of the system, help functions and integration with other systems

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Abstract

Commercially available applications of hypertext are based upon the premise of information 'nodes' being connected by 'links'. This manner of presenting information has been described in terms of 'electronic space'. Some confusion has arisen from an ambiguous use of the term 'space'. Much of the research into navigation has unquestioning adopted a physical metaphor, assuming that users navigate through this as they would in 3 dimensional space. Disorientation is the by product of poor interface desing, and is not a feature of hypertext. Users become 'lost' because it is unclear what actions they can perform. System designers should consider hypertext as a problem space, rather than a physical space

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Abstract

Explores inter record linkage relationships of a bibliographic hypertext system through the use of descriptor term co-occurrences. Using term distribution and term exhaustivity data for an existing system, develops 3 models of term co-occurrence and tests against the observed data. The developed models do not adequately model the observed co-occurrence patterns for select parts of the distribution using chi-square values. With knowledge of the structure of such a hypertext system, an appropriate model may be constructed and used as the basis for studying systems design of inter-record linkages and system navigation by users in such a hypertext system

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Abstract

Reports a descriptive study conducted with 17 middle school students reading hypertext versions of two short stories. The study focused on gathering and analysing detailed information on students' use of various text enhancements designed to support their reading comprehension and to teach them the use of meta cognitive reading strategies. Data were collected via observations and interviews, as well as a computer monitor that recorded all student interactions with the hypertext documents. Analysis of the monitor transcripts led to the identification of 6 hypertext reading patterns: skimming, checking, reading, responding, studying and reviewing. The reading patterns varied considerable on at least 2 dimensions and their frequency of occurrence was felt to be influenced by such factors as software design, the instructional context, and the student's perception of the task

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Abstract

Investigates information-seeking tasks and associated cognitve issues in the context of interacting with an evolving collaborative hypertext. Fishexe view browsers were used to facilitate exploring in a large information space. The fishexe view browser was extended to incorporate word frequencies. The effects of the fisheye view browser and the changing document were tested with 2x2 factorial experiment. Multivariate tests founs a significant interaction between the 2 factors and a significant main effect of the fisheye view browser. The users who had access to the word frequency information performed their tasks more effectively than the users without access to word frequencies. This work implies that several aspects of an evolving hypertext might als be useful incorporated in an associated fishexe view browser

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Abstract

This paper describes part of a university research project which aims to construct a design method involving interactive multimedia products for knowledge acquisition. The purpose of the method is to design truly interactive multimedia products (Vidalenc, 1997), and thus to introduce a new form of writing. This is built up by adopting a constructivist paradigm that is based upon a systemic view and upon a network approach such as proposed by the sociology of translation (Callon, 1986). All our reflections are indeed based on the differentiation between two levels of information: an internal level and a sensitive level (Bouzidi and Vidalenc, 1997). However we have chosen a common model, the object oriented model, which allows us to represent the elements belonging to each level. In order to prove the validity of this proceeding, a prototype is under preparation. It is founded on the transposition of a course, which deals with telecommunications and networks, into a multimedia teaching tool. To be able to build up the prototype, taking into account the usual steps (writing the requirement schedule, choosing the necessary technology, modeling, design, implementation and evaluation), and after that, to be able to measure the conception method, a stage of analysis and assessment of the present course is necessary. The analysis of the course must allow us to identify the conditions of the knowledge transfer and provide components for the requirement schedule of the hypermedia product. This is the main subject of our reflections

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Abstract

The term hypertext has broadened to the extent that it is almost meaningless. In essence hypertext is a means of rapidly accessing knowledge indepent of the user's abilities to access the knowledge. Librarians need to be wary of ineffective 'imitation' hypertext systems which lack a coherent linking system on which the user's ability to access knowledge depends. An analogy with library catalogues shows that hypertext systems lack access value in direct proportion to their lack of carefully developed schemes of classification. In a well constructed hypertext system access is rendered easy by a developed structure and the user requires little training in them

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Abstract

This article examines searcher behavior and affective response to a hypertext-based bibliographic information retrieval system called HyperLynx for searchers with different search skills and backgrounds. Search times and number of nodes visited were recorded for five specified search queries, and views of the system were recorded for each searcher. No significant differences were found in search times or user satisfaction with the system, indicating that a hypertext-based approach to bibliographic retrieval could be appropriate for a variety of searcher experience levels

Source

Journal of the American Society for Information Science. 46(1995) no.1, S.22-29

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Abstract

Current hypertext systems have been widely and effectively used on relatively small data volumes. Explores the potential of database technology for aiding the implementation of hypertext systems holding very large amounts of complex data. Databases meet many requirements of the hypermedium: persistent data management, large volumes, data modelling, multi-level architecture with abstractions and views, metadata integrated with operational data, short-term transaction processing and high-level end-user languages for searching and updating data. Describes a system implementing the storage, retrieval and recall of trails through hypertext comprising textual complex objects (to illustrate the potential for the use of data bases). Discusses weaknesses in current database systems for handling the complex modelling required

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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

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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

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Date

19.10.1995 10:22:53

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Date

22. 2.1997 19:40:31