Search (37 results, page 1 of 2)

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Abstract

Describes a method for navigating and learning from a complex, content-based hypermedia system. Describes a system that promotes a model for structuring hypertext that makes the learner responsible for seeking information, rather than relying on the system to deliver it. It supports question-asking by providing a 'point and query' interface

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Abstract

When the Web was invented, it was touted as a novel nonlinear medium for the written word. No longer would we be constrained by linear presentations! Hyperlinks would allow us to jump haphazardly from page to page, chapter to chapter, idea to idea! Texts would no longer need to run from beginning to end! This is misleading. A printed book is also multidimensional and potentially nonlinear. We can open it to any page, from any other page, for any reason. We can open several books at once. In fact, what makes a book special is its combination of linear structure (the order of the words) and nonlinear physicality (the bound papers). This linear/nonlinear duality is enhanced further by the index, which maps linearly sequenced pages in a nonlinear, informationally ordered structure (architecture). In truth, the online environment is crippled by an absence of linear structure. Imagine selecting a hard cover book, tearing off the covers, ripping pages into small pieces, and throwing them in a box. That box is like a computer file system, and the paper scraps are Web documents. Only one scrap can be retrieved from the box at a time, and it must be replaced before another can be accessed. Page numbers are meaningless. Global context is destroyed. And without page numbers or context, what happens to the index?

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Abstract

Describes an SGL relational database schema for representing the objects in HyperCard, along with a technique for automatically populating this schema from a HyperCard stack using the facilities in HyperTalk with calls to the database manager. The stabndard relational database query language SQL can then be used to perform more general hypertext searches than are possible with the string search feature found in most hypertext browsing environments. These techniques, although demonstrated specially usinf HyperCard and Oracle for Macintosh, are generally applicable to a wide range of hypertext systems and relational databases

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Abstract

In most hypertext systems, information retrieval techniques emphasize browsing or navigational methods which are not thorough enough to find all relevant material, especially when the number of nodes and/or links becomes very large. Reviews the main query-based search techniques currently used in hypertext environments. Explains the experimental methodology. Concentrates on the retrieval effectiveness of these retrieval strategies. Considers ways of improving search effectiveness

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Abstract

Presents a set of high-level hypermedia features: typed nodes and links, link attributes, structure-based query, transclusion, warm and hot links, private and public linkds, external link databases, link update mechanisms, overview, trails guided tours, backtracking and history-based navigation. Illustrates each feature from existing implementations and a running scenario. Gives suggestions for implementing these on the WWW and in other information systems

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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

Modern hypertext applications require new system support for hypertext authoring and user navigation through large sets of documents connected by links. This system support must be based on advanced, typed data models for describing the information structure in different application domains. Schema based structuring through strongly typed documents and links has already been proposed and put to practical use in a multitude of hypertext applications. Systems such as Multicard/O2 and MORE have moreover exploited conceptual schemas for querying the resulting hyperdocuments in a more structured way. Shows how hypertext schemas and query languages can be utilized for designing hypertext authoring and browsing environments for large hypertexts. Illustrates mechanisms using the Gram data model and describes their implementation on top of the Multicard hypermedia system connected to the O2 object oriented database management system

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Abstract

Interactive dynamic maps (IDMs) help users interactively explore webs of hypermedia documents. IDMs provide automatically generated abstract graphical views at different levels of granularity. Visual cues give users a better understanding of the content of the web, which results in better navigation control and more accurate and effective expressions of queries. IDMs consist of: topic maps, which provide visual abstractions of the semantic content of a web documents and document maps, which provide visual abstractions of subsets of documents. The major contribution of this work include: automatique techniques for building maps directly from a web of documents, including extraction of semantic content and use of a spatial metaphor for generating layout and filing space, a direct manipulation interaction paradigm for exploring webs of documents, using maps and an integrated graphical query language, and the ability to use the maps themselves as documents that can be customized, stored in a library and shared among users

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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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Abstract

While hypertext is often claimed to be a tool that especially aids associative thinking, intellectual "work" involves more than association. So, questions arise about the usefulness of hypertext tools in the more disciplined aspects of scholarly and argumentative writing. Examining the phases of scholarly writing reveals that different hypertext tools can aid different phases of intellectual work in ways other than associative thinking. Spatial hypertext is relevant at all phases, while page-and-link hypertext is more appropriate to some phases than others.

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Abstract

When searching information in a hypertext is limited to navigation, it is not an easy task, especially when the number of nodes and/or links becomes very large. A query based access mechanism must therefore be provided to complement the navigational tools inherent in hypertext systems. Most mechanisms currently proposed are based on conventional information retrieval models which consider documents as indepent entities, and ignore hypertext links. To promote the use of other information retrieval mechnaisms adapted to hypertext systems, responds to the following questions; how can we integrate information given by hypertext links into an information retrieval scheme; are these hypertext links (and link semantics) clues to the enhancement of retrieval effectiveness; if so, how can we use them. 2 solutions are: using a default weight function based on link tape or assigning the same strength to all link types; or using a specific weight for each particular link, i.e. the level of association or a similarity measure. Proposes an extended vector processing scheme which extracts additional information from hypertext links to enhance retrieval effectiveness. A hypertext based on 2 medium size collections, the CACM and the CISI collection has been built. The hypergraph is composed of explicit links (bibliographic references), computed links based on bibliographic information, or on hypertext links established according to document representatives (nearest neighbour)

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Date

19.10.1995 10:22:53

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Abstract

Evaluates an adaptive hypermedia system, PUSH, and compares it to a non-adaptive variant of the same system. Based on an inferred information-seeking task, PUSH chooses what to show and what to hide in a page using a stretchtext technique, thus attempting to avoid information overload. Studies how successful the subjects were in retrieving the most relevant information, and finds that the subjects' solutions were influenced by the choice made by the adaptive system. Studies how much the adaptivity reduced the amount of actions needed, and found that subjects made substantially fewer actions in the adaptive case. A 3rd measurement was the subjects' subjective preferences for the adaptive or the non-adaptive system, where it is found that the subjects clearly preferred the adaptive system

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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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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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Source

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

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