Search (37 results, page 1 of 2)

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Abstract

Describes the history of the Univ. of Liverpool Research Group and its vision. The vision is to merge medical knowledge and hypermedia to produce more powerful information generation and improve access tools for those in health care. Like GALEN, the plan is to improve the construction of knowledge bases and provide user interfaces to medical information

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Abstract

Part of a special section on hypertext. Hypertext is the computer storage of information as fragmented but linked multi-dimensional documents. Such systems offer advantages over the printed word, (group authorship, more creative access to the data) but there are drawbacks. Discusses chunky and creamy hypertext design methods of presenting information to the user

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Date

19.10.1995 10:22:53

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Content

The individual and hypermedia; human-computer interaction - hypertext - multimedia - the group and groupware; group and groupware principles - groupware applications; the organization and networks; the organization - networks and their applications; organizational case studies

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Date

22. 2.1997 19:40:31

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Date

22. 7.1998 18:23:25

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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

Presents a model for an electronic book (hyper-book). Hyper-books are electronic books defined on the basis of the paper book metaphor. Gives a formal definition of the hyper-book model as a dynamic system. The model was implemented in a working system, and evaluated with a group of users. The evaluation has confirmed that the adoption of the book metaphor is very effective, as it guarantees ease of using and understanding the system

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Abstract

Describes a user study where the popularity of each node in a hypertext dtabase was presented with the links leading to that node and where popularity was computed by counting the number of users who had previously visited the node. Users clearly incorporated popularity information in their decisions: compares their browsing patterns with a control group for whom the popularity information was not provided. One possible use of popularity can be offset the previously documented trait of users to over-select items near the top or bottom of a linear list. Documents that popularity information affects user behaviour, but ages not necessarily advocate its use

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Abstract

As part of ongoing investigation of information seeking behaviour of end users in electronic environments, a comparison was made of those users having expertise in a topic area and those with expertise in online searching. Computer scientists and online search specialists conducted assigned searches in a HyperCard database on the topic of hypertext. Both groups of experts were able to conduct successful searches and outperformed a novice control group. Search specialists took slightly less time tahn the domain experts, modified queries by adding terms found in the text, and tended to focus on query formulation. Domain experts focused on the text and used their domain knowledge for further question answering

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Abstract

Proceeds on the assumption that the key to unlocking the navigation potential of hypertext and hypermedia systems lies in the more semantics aware indexing of the interrelated information stored in these systems. Highlights the different indexing techniques which have been proposed for hypertext and hypermedia systems, and discusses the so called semantic hyperindexing technique recently developed by the authors, at The Materials Information processing Systems group of the Department of Metallurgy and Materials Engineering, Katholieke Universiteit Leuven, Belgium, to represent the significant relations between hypertextual information. Describes in detail how the semantic hyperindexing technique is being used to support intensional navigation in a third order hypermedia system, based on the definition of meaningful traversal trails between semantically associated nodes, which the user can navigate freely while still being gently guided by the system. Concludes with a description of a graphical notation developed to help authors in visualizing these intensionally defined transversal trails and discusses how the use of this notation improves the productiveness of the authors during trail design

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Source

Information retrieval: new systems and current research. Proceedings of the 15th Research Colloquium of the British Computer Society Information Retrieval Specialist Group, Glasgow 1993. Ed.: Ruben Leon

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Abstract

Techniques to aid the manipulation of a computer based document were tested by a group of 38 novice users. The subjects were given a period of time to browse the document, and were subsequently given a set of goal related tasks in a questionnaire/answer session. The techniques tested were sequential paging, index referral, text fins and embedded hypertext links. 3 differing types of link mechansms were assessed and compared with each other. Sequential paging and index referral were the most commonly used of the techniques. Text find was employed more for goal related tasks than for browsing. The hypertext link technique was generally unpopular, especially for goal related tasks. In order to establish the importance of the text find technique, the effect on reading strategies without this facility was also investigated. For browsing operations, an increase in paging and decrease in hypertext linking was observed. In the case of goal directed searching, an increase was observed in paging and index referral techniques. The study calls into question the usefulness of hypertext in educational software

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Abstract

The design and development of web-based educational systems for people with special abilities have recently attracted the attention of the research community. However, although a number of systems that claim to meet accessibility needs and preferences are proposed, most of them are typically supported by hypermedia and multimedia educational content that is specially designed for the user targeted group. Such approaches prevent their user groups (both learners and their tutors) from accessing other available resources. Therefore, it is important to be able to built generic e-learning systems that would allow the reuse of existing learning resources in different accessibility demanding applications. To this end, in this article we propose a methodology for defining an accessibility application profile that captures the accessibility properties of learning objects in a standard form and we examine its application to the IEEE Learning Object Metadata (LOM) standard.

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Source

Nachrichten für Dokumentation. 44(1993) H.1, S.15-22

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Source

Information today. 6(1989) no.4, S.22-24

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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

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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.

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Source

International journal of information management. 11(1991) no.1, S.14-22

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