-
Malsburg, C. von der: ¬The correlation theory of brain function (1981)
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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
- Content
- Originally published July 1981 as Internal Report 81-2, Dept. of Neurobiology, Max-Planck-Institute for Biophysical Chemistry, 3400 Gottingen, W.-Germany.
- Source
- http%3A%2F%2Fcogprints.org%2F1380%2F1%2FvdM_correlation.pdf&usg=AOvVaw0g7DvZbQPb2U7dYb49b9v_
-
Hickey, T.B.: ¬The Experimental Library System (XLS) (1989)
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- Abstract
- The Experimental Library System project investigated methods of integrating a bibliographic/full text retrieval system with a relational data base management system for use with OPACs (on-line public access catalogues).
-
Markey, K.: Findings of the Dewey Decimal Classification on-line project (1986)
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- Theme
- Klassifikationssysteme im Online-Retrieval
-
Williamson, N.J.: ¬The Library of Congress Classification in the computer age (1989)
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- Abstract
- Research leading to a detailed content analysis and profile of the Library of Congress Classification schedules. A description of the design, methodology, and preliminary findings of research in progress. Final results of the study are expected to aid the Library of Congress in the development of a MARC format for its classification schedules and in the conversion of the schedules into machine-readable form. LC's ultimate goal is the design of an integrated system which will permit on-line editing, maintenance, and control of the schedules, on-line classification and shelflisting procedures, the production of the schedules in two or more physical formats, and the use of LCC to enhance search capabilities in on-line catalogues.
- Theme
- Klassifikationssysteme im Online-Retrieval
-
Bates, M.J.: How to use controlled vocabularies more effectively in online searching (1989)
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- Abstract
- Optimal retrieval in on-line searching can be achieved through combined use of both natural language and controlled vocabularies. However, there is a large variety of types of controlled vocabulary in data bases and often more than one in a single data base. Optimal use of these vocabularies requires understanding what types of languages are involved, and taking advantage of the particular mix of vocabularies in a given data base. Examples 4 major types of indexing and classification used in data bases and puts these 4 in the context of 3 other approaches to subject access. Discusses how to evaluate a new data base for various forms of subject access.
- Source
- Online '88. Proceedings of the Online Inc., Conference, New York, 11-12 October 1988
- Theme
- Verbale Doksprachen im Online-Retrieval
-
Bates, M.J.: How to use controlled vocabularies more effectively in online searching (1989)
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- Abstract
- Optimal retrieval in on-line searching can be achieved through combined use of both natural language and controlled vocabularies. However, there is a large variety of types of controlled vocabulary in data bases and often more than one in a single data base. Optimal use of these vocabularies requires understanding what types of languages are involved, and taking advantage of the particular mix of vocabularies in a given data base. Examples 4 major types of indexing and classification used in data bases and puts these 4 in the context of 3 other approaches to subject access. Discusses how to evaluate a new data base for various forms of subject access.
- Theme
- Verbale Doksprachen im Online-Retrieval
-
Pietris, M.K.D.: Characteristics of LC Subject Headings that should be taken into account when designing on-line catalogues (1987)
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- Theme
- Verbale Doksprachen im Online-Retrieval
-
Knauth, M.: Bibliographies made easy : a look at PRO-CITE (1989)
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- Abstract
- The PRO-CITE and BIBLIO-LINK software packages make the process of compiling bibliographies and internal data bases much easier than when all the steps in the process were manual (compiling, typing). The 2 programs work on records that have been downloaded from on-line data bases. BIBLIO-LINK analyses the downloaded records to determine document type and stores the data in the appropriate PRO-CITE workform, putting fields from the downloaded record into the correct PRO-CITE fields.
- Source
- Computers in libraries. 9(1989) no.4, S.22-24
-
Snow, M.: Visual depictions and the use of MARC : a view from the trenches of slide librarianship (1989)
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- Abstract
- Paper presented at a symposium on 'Implementing the Art and Architecture Thesaurus (AAT): Controlled Vocabulary in the Extended MARC format', held at the 1989 Annual Conference of the Art Libraries Society of North America. The only way to get bibliographic records on to campus on-line library catalogues, and slide records on the national bibliographic utilities, is through the use of MARC. Discusses the importance of having individual slide and photograph records on the national bibliographic utilities, and considers the obstacles which currently make this difficult. Discusses mapping to MARC from data base management systems.
- Date
- 4.12.1995 22:51:36
-
Lancaster, F.W.: Trends in subject indexing from 1957 to 2000 (1980)
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- Abstract
- Computer have been used in 2 areas of printed index production: to sort entries and fromat printed indexes, and to derive a series of index entries from a minimum intellectual input. Computer indexing enables more indexing terms to be used as well as weighted terms, links and roles. Interest in automatic indexing peaked in the mid-1960s and has since declined. Interest in machine-aided indexing concentrates on using the computer for on-line display or for indexing by extraction. Computers have also made possible the implementation of retrieval systems without indexing-free text systems. Considers future prospects and needs
- Source
- New trends in documentation and information: proceedings of the 39th FID Congress, University of Edinburgh, 25-28 Sept 1978. Ed.: P.J. Taylor
-
Olsen, R.J.; Christensen, J.O.; Larsen, K.A.; Willey, K.: Implementing NOTIS keyword/Boolean searching : a case study (1989)
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- Abstract
- Contribution to a thematic issue devoted to subject control in on-line catalogues. Keyword searching with Boolean operators was impossible in the traditional on-line catalogue and its promised benefits in on-line systems are not yet clear. Reports on a survey undertaken at Brigham Young University library, Utah, which investigated this issue when the library was selected as a test site for keyword searching in the NOTIS on-line catalogue. Results of the survey were mixed. While keyword searching will require increased computer capacity for unstricted use, students, though content with the new tool, are not adept at using its sophisticated features and will require much more training than for the basic NOTIS on-line catalogue.
-
Gödert, W.: Klassifikationssysteme und Online-Katalog (1987)
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- Abstract
- Free text searching with keywords in a complete data store is not necessarily the best automatic retrieval method. There must be a proper classification of documents and concepts and the use of a proper classification system avoids problems of terminological deficiency. The dialogue search form makes the on-line catalogue a new information medium. A bibliographic unit must be created with as many search access points as possible, using verbal and classificatory search elements. Verbal search categories must include free text elements for individual search access requirements and a controlled vocabulary with syntactic connections. Classified data should consist of a universal classification system with clear structural notation for access and surface searching, together with several specialist subject classifications for differentiated documentation and retrieval. The universal classification needs no detailed subdivision: it serves mainly as a guide and entry to the detailed sub-systems
- Theme
- Klassifikationssysteme im Online-Retrieval
-
Wood, A.J.: OPACs in public libraries : some results of a survey (1989)
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- Abstract
- Reports the results of a survey of on-line public access catalogue applications in UK public libraries. Tables present data on: public libraries with operational OPACs in 1987; forms of catalogues in use; planned OPACs; access points and record formats available
-
Boeckx, T.: Onderwerpontsluiting in de on-line publiekscatalogus (1986)
0.09
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- Theme
- Verbale Doksprachen im Online-Retrieval
Klassifikationssysteme im Online-Retrieval
-
Smeaton, A.F.; Rijsbergen, C.J. van: ¬The retrieval effects of query expansion on a feedback document retrieval system (1983)
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- Date
- 30. 3.2001 13:32:22
- Theme
- Semantisches Umfeld in Indexierung u. Retrieval
-
May, G.: Pictorial history online : a new way to research our past (1989)
0.09
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- Abstract
- Discusses the storage of images (Australian historical photographs) and associated descriptive text, and the simultaneous on-line retrieval of both the images and the text. Describes the process of image retrieval from videodisc linked to data bases focusing on the Bicentennial Archives Project at the New South Wales Government Printing Office. The following aspects are examined: history of the project; systems now operating; hardware; videodisc production; and data base creation and information retrieval. Discusses applications of this system in other Australian institutions and outlines some major advantages of videodisc-based image retrieval systems.
-
Hodges, P.R.: Keyword in title indexes : effectiveness of retrieval in computer searches (1983)
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- Abstract
- A study was done to test the effectiveness of retrieval using title word searching. It was based on actual search profiles used in the Mechanized Information Center at Ohio State University, in order ro replicate as closely as possible actual searching conditions. Fewer than 50% of the relevant titles were retrieved by keywords in titles. The low rate of retrieval can be attributes to three sources: titles themselves, user and information specialist ignorance of the subject vocabulary in use, and to general language problems. Across fields it was found that the social sciences had the best retrieval rate, with science having the next best, and arts and humanities the lowest. Ways to enhance and supplement keyword in title searching on the computer and in printed indexes are discussed.
- Date
- 14. 3.1996 13:22:21
-
Hartley, R.J.: LISA on CD-ROM : an evaluation (1989)
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- Abstract
- Presents a detailed evaluation of the CD-ROM data base Library and Information Science Abstracts (LISA), published by Library Association Publishing Ltd in partnership with SilverPlatter Information Inc. Describes the SilcerPlatter search software and gives results of test searches carried out using the CD-ROM and DIALOG on-line versions of LISA. The annual cost of subscribing to LISA on CD-ROM is 995 US dollars or 750 dollars to subscribers of other SilverPlatter data bases. LISA on CD-ROM will be of most interest to institutions which make heavy use of the on-line version and are not discouraged by the low updating frequency.
-
Frieband, S.J.; Burnum, J.: ¬The US Trade Representative (USTR) trade thesaurus : development, innovation and use (1988)
0.08
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- Abstract
- Describes the background and context for the development of a trade related thesaurus in the Office States Trade Representative (USTR) and discusses thesaurus construction and the approach to thesaurus use in this government agency. During this process a strong end user orientation has been emphasised. The on-line USTR Trade Thesaurus has been integrated into several in-house data bases, including WordPerfect (WP), the USTR word processing system. A WordPerfect indexing card system permits users to assign up to 5 indexing terms from the Thesaurus during the normal WP exiting and saving procedure. Users may add proposed new terms directly into a system or suggest thesaurus modifications directly on-line by completing an 'add' or 'modify' screen.
- Source
- Information services and use. 8(1988) nos.5/6, S.239-248
-
Alkula, R.; Sormunen, E.: Problems and guidelines for database descriptions (1989)
0.08
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- Abstract
- An essential part of information retrieval knowledge is the knowledge of data base contents and structures. Currently, the variety of data bases is so wide that it is difficult to know the contents and structure of a particular data base and how they differ from those of other data bases. Because of the lack of commonly acknowledged guidelines for data base descriptions, each on-line service designs and produces printed manuals, on-line help texts and other user documentation in its own manner. For the presentation of exact information and knowledge on a data base, common, structured principles for data base descriptions are needed. Requirements and some solutions for such description principles are presented.
- Source
- Information and innovation. Proceedings of the 7th Nordic Conference for Information and Documentation, Århus University, Denmark, 28-30 August 1989. Ed. by Helge Clausen
