Search (72 results, page 1 of 4)

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Abstract

Considers the reason why CD-ROM's promise of a large range of legal data bases has, to some extent, been limited. The new range of CD-ROM hypertext data bases, produced by West Publishing Company, are discussed briefly.

Source

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

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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

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

With the growth of hypertext and multimedia applications that support and encourage browsing it is time to take a penetrating look at browsing behaviour. Several dimensions of browsing are exemined, to find out: first, what is browsing and what cognitive processes are associated with it: second, is there a browsing strategy, and if so, are there any differences between how subject-area experts and novices browse; and finally, how can this knowledge be applied to improve the design of hypertext systems. Two groups of students, subject-area experts and novices, were studied while browsing a Macintosh HyperCard application on the subject The Vietnam War. A protocol analysis technique was used to gather and analyze data. Components of the GOMS model were used to describe the goals, operators, methods, and selection rules observed: Three browsing strategies were identified: (1) search-oriented browse, scanning and and reviewing information relevant to a fixed task; (2) review-browse, scanning and reviewing intersting information in the presence of transient browse goals that represent changing tasks, and (3) scan-browse, scanning for interesting information (without review). Most subjects primarily used review-browse interspersed with search-oriented browse. Within this strategy, comparisons between subject-area experts and novices revealed differences in tactics: experts browsed in more depth, seldom used referential links, selected different kinds of topics, and viewed information differently thatn did novices. Based on these findings, suggestions are made to hypertext developers

Source

IEEE transactions on systems, man and cybernetics. 22(1992) no.5, S.865-884

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Abstract

Discusses the decision points and major implementation steps for deploying a client server full text image retrieval system within a large aerospace manufactoring organisation. The changes in interface brought about by moving from workstation platform to client server, and combining a controlled vocabulary data base with a full text data base are described

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Abstract

The Canto hypertext data model is chracterized by a hierarchical scheme mechanism that allows a predetermined, open-ended scheme to be embedded in the hyperdocument. Canto uses 2 types of nodes: concept nodes, which provide organizational structure, and information nodes, which contain text and other data. Describes the model, explains how it reduces user disorientation and discuss the most important features. Presents a formal specification of Canto's functionally and discusses the scheme definition language that a hypertext system designer uses to establish a hypertext scheme. Presents the scheme manipulation language which allows for alterations to the scheme and data. Describes a test conducted to determine the usability of hypertext systems built using Canto and discusses related work

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Abstract

Although the object-oriente paradigm is well suited for modelling self-contained independent objects, it is not suited for modelling persistent relations (static links) between abstract data objects. At the same time, the concept of computer-navigable links is an integral part of hypermedia paradigm. In contrast to multimedia, where the object-oriented paradigm plays a leading role, the 'static link' deficiency considerably reduces the application of object-oriented methods in hypermedia. Presents a new logical data model (the HM Data Model) which incorporates the well-known principles of object-oriented data modelling into the management of large-scale, multi-user hypermedia databases. The model is based on the notion of abstract hypermedia data objects called S-collections. Computer-navigable links approach not only overcomes the static link deficiency of the object-oriented paradigm, but also supports modularity, incremental development, and flexible versioning, and provides a solid logical basis for sematic modelling

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Abstract

The Multimedia Information Presentation System (MIPS) will allow end users to browse multimedia information presented in a user friendly and consistent manner. In its most powerful configuration, it will allow the end user to formulate queires which are interpreted, analyzed, and dispatched by the system to heterogeneous distributed external data sources, and to view a coherent and customized presentation of the data retrieved as answers. Data are stored in, or referenced from, a set of hyperdocuments conforming to the ISO standards HyTime and SGML. The hyperdocuments constitute an information web which may be dynamically expanded to accomodate retrieved data. The web navigation structure, structure of information nodes, specification of presentation mechanisms, specification of presentation tools, and data are separable and potentially reusable for different applications, different activities within an application, or different environments. Outlines the intended functionality and the design of MIPS, with particular reference to the structure and function of the hypermedia web and the role of the knowledge base system module in its dynamic expansion

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Abstract

Hypertext users often experience the so called 'lost in hyperspace' problem: where users experience disorientation stemming from too many jumps in the course of browsing through large databases. Proposes a filtering algorithm which is suitable for a wide spectrum of implementations and which restricts the amount of information available to the user; thus allowing improved hypertext browsing. An algorithm calculates the set of most relevant hypertext nodes for the user, utilizing the user profile and data clustering technique. The result is an optimal cluster of relevant data items, custom-tailored for each user's needs

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Abstract

Multimedia art catalogues present a number of recurring characteristics in both the type of data and the users involved, and in the type of operations required. Typical data include textual catalogue cards manageable through an information retrieval system (IRS), as well as textual captions, images, video and speech, strutured as a hypermedia network. Proposes a model for the design of these applications and discusses its effectiveness in improving the quality of the application. The model exploits a multi-level design approach to organize data and access structures of the IRS while the entity-relationship (E-R) approach, tailored to model hypermedia applications, is adopted to describe the structure of the documents and their links

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Abstract

The article presents a conceptual framework for distinguishing different sorts of heterogeneous digital materials. The hypothesis is that a wide range of heterogeneous data resources can be characterized and classified due to their particular configurations of hypertext features such as scripts, links, interactive processes, and time scalings, and that the hypertext configuration is a major but not sole source of the messiness of big data. The notion of hypertext will be revalidated, placed at the center of the interpretation of networked digital media, and used in the analysis of the fast-growing amounts of heterogeneous digital collections, assemblages, and corpora. The introduction summarizes the wider background of a fast-changing data landscape.

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Abstract

Author (editor of the Hitachi Data System's magazine 'Advantage') guages the crowd's reaction to Mosiac and the Web - and gives some insights into the significance the Web will have on people's working lives

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Abstract

Explores the epistemological foundations of hypertext and hypermedia, focusing on the need for an acute awareness of cognitive issues in the design and execution of academic data bases.

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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

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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Abstract

Examines the problems encountered when setting up a hypertext link (termed the identity link) for moving between bibliographic and full text data bases, e.g. MEDLINE and CCAL. Argues that these problems are symptomatic of deeper concerns, involving criteria and classificatory fields.

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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

A materialized hypertext view is a hypertext containing data coming from a database and whose pages are stored in files. A Web site presenting data coming from a database is an example of such a view, where the hypertext pages are HTML files. Even if the most popular approach to the generation of such sites is the virtual one, there is also a rationale for a materialized apporach. This paper deals with the maintenance issues required by these derived hypertext to enforce consistency between page content and database state

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Date

19.10.1995 10:22:53

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Date

22. 2.1997 19:40:31