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Rada, R.: Hypertext and paper : a special synergy (1991)
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- Abstract
- Some people argure that hypertext is easy to write, is hard to create by converting existing text into hypertext, and has a massive market. This paper argures the contrary. First, Hypertext is hard to write. Second, automatically converting a text into hypertext is, to a first approximation, easy. Third, successful marketing of hypertext depends on having a large volume of material that is also available in paper form
- Source
- International journal of information management. 11(1991) no.1, S.14-22
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You, G.-N:; Rada, R.: ¬A systematic approach to outline manipulation (1994)
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- Abstract
- Outlines (Tables of contents) reflect a conceptual model and can serve as a cognitive aid in reading and writing hypertext
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Rada, R.; Wang, W.; Birchall, A.: Retrieval hierarchies in hypertext (1993)
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Rada, R.: Converting a textbook to hypertext (1992)
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Rada, R.; Bicknell, E.: Ranking documents with a thesaurus (1989)
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Rada, R.; Mili, H.: Document reuse : organizing, finding, and reorganizing content (1992)
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- Abstract
- Existing structures should be exploited as best as possible in the course of document reuse. Reuse may take multiple forms: rearranging a single document so as to provide different views of the same information, copying a portion of a single document to as to provide a portion of a new document, and combining portions of existing documents to constitute a new document. Algortihms are presented to do such reuse, examples are provided. For significant reuse the information in existing documents need to be abstracted so as to highlight the conceptual pattern
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Rada, R.; Mili, H.; Bicknell, E.: Development and application of a metric on semantic nets (1989)
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McMath, C.F.; Tamaru, R.S.; Rada, R.: ¬A graphical thesaurus-based information retrieval system (1989)
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Rada, R.: Hypertext writing and document reuse : the role of a semantic net (1990.)
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- Abstract
- When document components are classified and then recombined during document re-use, a semantic net may serve as the classification language. A theory of analogical inheritance, applied to this semantic net, guides the reorganisation of document components. Authors index paragraphs from various sources with node-link-node triples from a semantic net and then use programs to transverse the semantic net and generate various outlines. The program examines node and link names in deciding which path to take. Describes how these techniques helped in the re-use: parts of an existing book to write a new one
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Rada, R.: Writing and reading hypertext : an overview (1989)
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Mili, H.; Rada, R.: Merging thesauri : principles and evaluation (1988)
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McMath, C.; Tamararu, B.; Rada, R.: Graphical interface to thesaurus-based information retrieval system (1988)
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Rada, R.: Knowledge-sparse and knowledge-rich learning in information retrieval (1987)
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Chen, C.; Rada, R.: Interacting with hypertext : a meta-analysis of experimental studies (1996)
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- Abstract
- Presents a study on hypertext examining the cognitive styles and spatial ability of users; the complexity of tasks; and the strucutre of information organization and the visualization of the structure. Future work on hypertext usability should emphasize task taxonomies along with longitudinal and ethnographic studies for a deep understanding of the interactions between users and hypertext
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-
Rada, R.; Bird, G.; Zheng, M.: Hypertext interchange using ICA (1995)
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Rada, R.; Barlow, J.; Potharst, J.; Zanstra, P.; Bijstra, D.: Document ranking using an enriched thesaurus (1991)
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- Abstract
- A thesaurus may be viewed as a graph, and document retrieval algorithms can exploit this graph when both the documents and the query are represented by thesaurus terms. These retrieval algorithms measure the distance between the query and documents by using the path lengths in the graph. Previous work witj such strategies has shown that the hierarchical relations in the thesaurus are useful but the non-hierarchical are not. This paper shows that when the query explicitly mentions a particular non-hierarchical relation, the retrieval algorithm benefits from the presence of such relations in the thesaurus. Our algorithms were applied to the Excerpta Medica bibliographic citation database whose citations are indexed with terms from the EMTREE thesaurus. We also created an enriched EMTREE by systematically adding non-hierarchical relations from a medical knowledge base. Our algorithms used at one time EMTREE and, at another time, the enriched EMTREE in the course of ranking documents from Excerpta Medica against queries. When, and only when, the query specifically mentioned a particular non-hierarchical relation type, did EMTREE enriched with that relation type lead to a ranking that better corresponded to an expert's ranking
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Rada, R.: Maintaining thesauri and metathesauri (1990)
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- Abstract
- Maintaining a thesaurus is a time-consuming task which should go hand-in-hand with the indexing of information and should be supported by software. To connect different document databases their respective thesauri should be related. The most straightforward way to support to support this by computer is to map the terms of one thesaurus to those of another. Such a mapping creates one kind of metathesaurus. As citation systems are extended to include full-text online, a new thesaurus may be used to index individual paragraphs. To illustrate these principles several computer systems are described which help people maintain thesauri and metathesauri. Particular success has been had by the National Library of Medicine with its Medical Subject Headings and its Unified Medical Language System
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Chen, C.; Rada, R.; Zeb, A.: ¬An extended fisheye view browser for collaborative writing (1994)
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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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Rada, R.; Liu, Z.; Zheng, M.: Connecting educational information spaces (1997)
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- Abstract
- Online textbooks can be connected to other sources of information to improve their educational value. We describe 2 case studies. One used in a medical textbook and connected to medical journal abstracts via a thesaurus. The textbook, journal abstracts, and thesaurus were stored on a CD-ROM. The other case study shows a textbook on the WWW that is connected to various other sources of information. About half the book references are to web sites, and the textbook is part of an online course that is connected to an online catalog and other courses. Such linkages among information spaces should help students navigate the information relevant to their studies
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Birchall, A.; Deakin, A.; Rada, R.: Knowledge automation and the need for intermediaries (1994)
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- Abstract
- Draws together research from a variety of disciplines to consider why and how information technology is qualitatively different from older technologies of information, and why this promotes changes at both the individual and the social level. Concludes from this analysis that there are 2 diverging directions for organizational and societal development: towards technocracy or towards the learning organization and the learning society. In both there will be roles that could be filled by librarians, but the learning organization's network structure would offer many more opportunities for active intermediary roles, and it is in accord with the social ethic of the library profession. In a technocracy, the librarian might assume the high status role of 'knowledge manager' but be out of touch with the ultimate users of information. Considers the pursuit of professional status by librarians as not being the best way to ensure the continuation of the 'social ethic' according to which librarians are educated. A new model of professionalism is needed along the lines suggested by D.A. Schon for the 'reflective practioner', in which knowledge and expertise are collaboratively developed in the interchange between the professional and the client
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