Search (2799 results, page 1 of 140)

  • × year_i:[1980 TO 1990}
  1. Rath-Beckmann, A.: Retrospektive Katalogkonversion (1986) 0.10 
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  2. O'Rourke, V.: Selection of an online public access catalog : a checklist approach (1987) 0.10 
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    Source
    Information technology and libraries. 6(1987), S.278-287
    Type
    a
  3. Kaske, N.K.: ¬The variability and intensity over time of subject searching in an online public access catalog (1988) 0.10 
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    Source
    Information technology and libraries. 7(1988), S.273-287
    Type
    a
  4. Scharmann, U.: Anwendung der Regeln für den Schlagwortkatalog (RSWK) in öffentlichen Bibliotheken. Abschlußbericht zum dbi-Projekt 11.35 (1989) 0.10 
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    Classification
    Bib A 391 / Schlagwortkatalog
    Bib B 91 / Sacherschließung
    Date
    22. 5.2007 12:07:51
    SBB
    Bib A 391 / Schlagwortkatalog
    Bib B 91 / Sacherschließung
  5. Malsburg, C. von der: ¬The correlation theory of brain function (1981) 0.09 
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    Abstract
    A summary of brain theory is given so far as it is contained within the framework of Localization Theory. Difficulties of this "conventional theory" are traced back to a specific deficiency: there is no way to express relations between active cells (as for instance their representing parts of the same object). A new theory is proposed to cure this deficiency. It introduces a new kind of dynamical control, termed synaptic modulation, according to which synapses switch between a conducting and a non- conducting state. The dynamics of this variable is controlled on a fast time scale by correlations in the temporal fine structure of cellular signals. Furthermore, conventional synaptic plasticity is replaced by a refined version. Synaptic modulation and plasticity form the basis for short-term and long-term memory, respectively. Signal correlations, shaped by the variable network, express structure and relationships within objects. In particular, the figure-ground problem may be solved in this way. Synaptic modulation introduces exibility into cerebral networks which is necessary to solve the invariance problem. Since momentarily useless connections are deactivated, interference between di erent memory traces can be reduced, and memory capacity increased, in comparison with conventional associative memory
    Source
    http%3A%2F%2Fcogprints.org%2F1380%2F1%2FvdM_correlation.pdf&usg=AOvVaw0g7DvZbQPb2U7dYb49b9v_
    Type
    a
  6. Lutes-Schaab, B.; Schuler, W.: ¬Die Anwendung von MIKROPLIS für den Aufbau einer persönlichen Terminologie-Datenbank (1985) 0.07 
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    Pages
    S.273-287
    Type
    a
  7. Luck, K. von; Meyer, R.; Pirlein, T.: ¬Die logische Rekonstruktion eines Gegenstandbereiches : eine Fallstudie (1989) 0.07 
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    Pages
    S.278-287
    Type
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  8. Cochrane, P.A.: Improving LCSH for use in online catalogs : exercises for self-help with a selection of background readings (1986) 0.07 
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    Classification
    Bib A 391 / Schlagwort
    Bib A 291 / On-line-Katalogisierung
    SBB
    Bib A 391 / Schlagwort
    Bib A 291 / On-line-Katalogisierung
  9. Weidner, C.: Internationale Entwicklung bei Videotex-Systemen : Standards, Digitalisierung, Situation in USA und Europa (1984) 0.07 
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    Type
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  10. Piggott, M.: ¬A topography of cataloguing, showing the most important landmarks, communications and perilous places (1988) 0.06 
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    Pages
    287 S
  11. ¬The Online catalogue : developments and directions (1989) 0.06 
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    Classification
    Bib A 291 / OPAC
    SBB
    Bib A 291 / OPAC
  12. Crawford, W.: Patron access : Issues for online catalogs (1987) 0.06 
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    Classification
    Bib A 291 / On-line-Katalogisierung
    SBB
    Bib A 291 / On-line-Katalogisierung
  13. Späth, L.: Wende in die Zukunft : die Bundesrepublik Deutschland auf dem Weg in die Informationsgesellschaft (1985) 0.04 
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  14. Thesaurus of information technology terms (1988) 0.04 
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    Classification
    Bib D 91 / Deskriptorenregister
    SBB
    Bib D 91 / Deskriptorenregister
  15. Vledutz-Stokolov, N.: Concept recognition in an automatic text-processing system for the life sciences (1987) 0.03 
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    Abstract
    This article describes a natural-language text-processing system designed as an automatic aid to subject indexing at BIOSIS. The intellectual procedure the system should model is a deep indexing with a controlled vocabulary of biological concepts - Concept Headings (CHs). On the average, ten CHs are assigned to each article by BIOSIS indexers. The automatic procedure consists of two stages: (1) translation of natural-language biological titles into title-semantic representations which are in the constructed formalized language of Concept Primitives, and (2) translation of the latter representations into the language of CHs. The first stage is performed by matching the titles agianst the system's Semantic Vocabulary (SV). The SV currently contains approximately 15.000 biological natural-language terms and their translations in the language of Concept Primitives. Tor the ambiguous terms, the SV contains the algorithmical rules of term disambiguation, ruels based on semantic analysis of the contexts. The second stage of the automatic procedure is performed by matching the title representations against the CH definitions, formulated as Boolean search strategies in the language of Concept Primitives. Three experiments performed with the system and their results are decribed. The most typical problems the system encounters, the problems of lexical and situational ambiguities, are discussed. The disambiguation techniques employed are described and demonstrated in many examples
    Source
    Journal of the American Society for Information Science. 38(1987) no.4, S.269-287
    Type
    a
  16. Borko, H.: Research in computer based classification systems (1985) 0.02 
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    Abstract
    The selection in this reader by R. M. Needham and K. Sparck Jones reports an early approach to automatic classification that was taken in England. The following selection reviews various approaches that were being pursued in the United States at about the same time. It then discusses a particular approach initiated in the early 1960s by Harold Borko, at that time Head of the Language Processing and Retrieval Research Staff at the System Development Corporation, Santa Monica, California and, since 1966, a member of the faculty at the Graduate School of Library and Information Science, University of California, Los Angeles. As was described earlier, there are two steps in automatic classification, the first being to identify pairs of terms that are similar by virtue of co-occurring as index terms in the same documents, and the second being to form equivalence classes of intersubstitutable terms. To compute similarities, Borko and his associates used a standard correlation formula; to derive classification categories, where Needham and Sparck Jones used clumping, the Borko team used the statistical technique of factor analysis. The fact that documents can be classified automatically, and in any number of ways, is worthy of passing notice. Worthy of serious attention would be a demonstra tion that a computer-based classification system was effective in the organization and retrieval of documents. One reason for the inclusion of the following selection in the reader is that it addresses the question of evaluation. To evaluate the effectiveness of their automatically derived classification, Borko and his team asked three questions. The first was Is the classification reliable? in other words, could the categories derived from one sample of texts be used to classify other texts? Reliability was assessed by a case-study comparison of the classes derived from three different samples of abstracts. The notso-surprising conclusion reached was that automatically derived classes were reliable only to the extent that the sample from which they were derived was representative of the total document collection. The second evaluation question asked whether the classification was reasonable, in the sense of adequately describing the content of the document collection. The answer was sought by comparing the automatically derived categories with categories in a related classification system that was manually constructed. Here the conclusion was that the automatic method yielded categories that fairly accurately reflected the major area of interest in the sample collection of texts; however, since there were only eleven such categories and they were quite broad, they could not be regarded as suitable for use in a university or any large general library. The third evaluation question asked whether automatic classification was accurate, in the sense of producing results similar to those obtainabie by human cIassifiers. When using human classification as a criterion, automatic classification was found to be 50 percent accurate.
    Pages
    S.287-305
    Source
    Theory of subject analysis: a sourcebook. Ed.: L.M. Chan, et al
    Type
    a
  17. Lapp, E.: Katalogsituation der Altbestände (1501-1850) in Bibliotheken der Bundesrepublik Deutschland einschließlich Berlin (West) : eine Studie im Auftrag der Deutschen Forschungsgemeinschaft (1989) 0.02 
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    Abstract
    Diese Studie enthält die Ergebnisse einer Untersuchung der Katalogsituation von 16 Bibliotheken und Zentralkatalogen, die für eine DFG-Förderung der Katalogkonversion in Frage kommen. Hauptgegenstand ist die Katalogqualität, also Fragen nach Katalogarten, nach den zugrundeliegenden Regeln, auch nach der Lesbarkeit der Titelaufnahmen. Weitere wichtige Kriterien sind, inwieweit die Bestände überhaupt durch Kataloge erschlossen sind, ob die Bibliothek bereits mit EDV arbeitet und ggf. in welcher Weise
  18. Dahlberg, I.: Conceptual definitions for INTERCONCEPT (1981) 0.02 
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    Source
    International classification. 8(1981), S.16-22
    Type
    a
  19. Pietris, M.K.D.: LCSH update (1988) 0.02 
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    Source
    Cataloguing Australia. 13(1988), S.19-22
    Type
    a
  20. Woods, W.A.: What's important about knowledge representation? (1983) 0.02 
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    Source
    Computer. 16(1983) no.10, S.22-27
    Type
    a

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