Search (23 results, page 1 of 2)

  • × author_ss:"Rada, R."
  1. Rada, R.; Bicknell, E.: Ranking documents with a thesaurus (1989) 0.04 
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    Source
    Journal of the American Society for Information Science. 40(1989) no.5, S.304-310
  2. Rada, R.; Barlow, J.; Potharst, J.; Zanstra, P.; Bijstra, D.: Document ranking using an enriched thesaurus (1991) 0.03 
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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
  3. Rada, R.: Connecting and evaluating thesauri : issues and cases (1987) 0.02 
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    Abstract
    Connecting and evaluating thesauri is an important task for the systematic development of better information retrieval systems. Connecting thesauri includes not only determining when terms in different thesauri are the same but also determining what kinds of relationships can be transferred from one thesaurus to another. This paper first presents issues in connecting and evaluating thesauri. Various experiments in connecting a particular thesaurus, the Medical Subject Headings, with other medical thesauri are described. In these experiments, similar terms in two thesauri are recognized and then differences in two thesauri are exploited to create more powerful thesauri. Part of the evaluation requires the thesaurus to support automatic indexing and retrieving of documents
  4. Rada, R.: Knowledge-sparse and knowledge-rich learning in information retrieval (1987) 0.01 
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    Source
    Information processing and management. 23(1987) no.3, S.195-210
  5. McMath, C.; Tamararu, B.; Rada, R.: Graphical interface to thesaurus-based information retrieval system (1988) 0.01 
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  6. Rada, R.; Wang, W.; Birchall, A.: Retrieval hierarchies in hypertext (1993) 0.01 
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    Source
    Information processing and management. 29(1993) no.3, S.359-372
  7. McMath, C.F.; Tamaru, R.S.; Rada, R.: ¬A graphical thesaurus-based information retrieval system (1989) 0.01 
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  8. Rada, R.: Focus on links : a holistic view of hypertext (1991) 0.01 
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    Abstract
    The disciplines of human-computer interaction, computer-supported collaborative work, information storage and retrieval, and artificial intelligence should complement one another in the new discipline of hypertext. This holistic view of hypertext focuses on links: links within a document (microtext), links among documents (macrotext), links among people (grouptext), and dynamic links (expertext). The principles and systems which are relevant to creating and accessing hypertext can be usefully presented under the heading of text, microtext, macrotext, grouptext and expertext. From text to expertext, people consistently use hierarchical structures, particularly hierarchical semantic nets, to organize information
  9. Rada, R.: Hypertext and paper : a special synergy (1991) 0.01 
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    Source
    International journal of information management. 11(1991) no.1, S.14-22
  10. Mili, H.; Rada, R.: Merging thesauri : principles and evaluation (1988) 0.00 
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  11. Rada, R.; Mili, H.; Letourneau, G.; Johnston, D.: Creating and evaluating entry terms (1988) 0.00 
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    Abstract
    An indexing language is made more accessible to searchers and indexers by the presence of entry terms or near-synonyms. This paper first presents an evaluation of existing entry terms and then presents and tests a strategy for creating entry terms. The key tools in the evaluation of the entry terms are documents already indexed into the Medical Subject Headings (MeSH) and an automatic indexer ...
  12. Rada, R.: Writing and reading hypertext : an overview (1989) 0.00 
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    Source
    Journal of the American Society for Information Science. 40(1989), S.164-171
  13. Rada, R.: Converting a textbook to hypertext (1992) 0.00 
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    Source
    ACM transactions on information systems. 10(1992) no.3, S.194-315
  14. Rada, R.; Liu, Z.; Zheng, M.: Connecting educational information spaces (1997) 0.00 
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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
  15. Rada, R.: Medical knowledge and hypermedia (1992) 0.00 
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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
  16. Rada, R.; Mili, H.: Document reuse : organizing, finding, and reorganizing content (1992) 0.00 
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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
    Source
    International journal of information management. 12(1992) no.4, S.310-319
  17. Chen, C.; Rada, R.; Zeb, A.: ¬An extended fisheye view browser for collaborative writing (1994) 0.00 
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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
  18. Rada, R.: Small, medium, and large hypertext (1991) 0.00 
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    Source
    Information processing and management. 27(1991) no.6, S.659-677
  19. Birchall, A.; Deakin, A.; Rada, R.: Knowledge automation and the need for intermediaries (1994) 0.00 
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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
    Source
    Journal of librarianship and information science. 26(1994) no.4, S.181-192
  20. Chen, C.; Rada, R.: Interacting with hypertext : a meta-analysis of experimental studies (1996) 0.00 
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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
    Theme
    Information

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