-
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
- Source
- http%3A%2F%2Fcogprints.org%2F1380%2F1%2FvdM_correlation.pdf&usg=AOvVaw0g7DvZbQPb2U7dYb49b9v_
-
Riehm, U.; Böhle, K.; Wingert, B.; Gabel-Becker, I.; Loeben, M.: Autoren, Verlage, Nutzer : Elektronisches Publizieren in der Bundesrepublik Deutschland (1989)
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- Abstract
- Die Ergebnisse des Projekts Elektronisches Publizieren (PEP) werden übersichtsartig dargestellt. Das Projekt umfaßte 1985-1988 eine Begleit- und Wirkungsuntersuchung zum Elektronischen Publizieren von Volltexten
-
Hörz, H.: Widerspiegelung, Kommunikation und Sprache (1981)
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-
Williamson, N.J.: Subject access in the on-line environment (1984)
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- Footnote
- Ein guter und lesenswerter Einstieg in die Probleme des sachlichen Online-Retrievals
- Source
- Advances in librarianship. 13(1984), S.49-97
-
Bertrand-Gastaldy, S.; Davidson, C.H.: Improved design of graphic displays in thesauri : through technology and ergonomics (1986)
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- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Rival, I.: Order - a theory with a view (1989)
0.02
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- Abstract
- Ordnung hat in unserer Alltagssprache eine Fülle von Bedeutungen. Als mathematischer Begriff ist Ordnung mit einer begrenzten Bedeutung festgelegt, die als eine Abstraktion der Beziehungen 'ist enthalten in', 'ist ein Teil von' und 'ist kleiner als' verstanden werden kann. Der mathematische Ordnungsbegriff tritt in vielen Bereichen der Mathematik und ihrer Anwendungen auf. Seine aktuelle Verwendbarkeit, wie etwa im Bereich der theoretischen Informatik, machen die mathematische Ordnungstheorie zu einem attraktiven Teilgebiet der gegenwärtigen Mathematik
- Source
- Klassifikation und Ordnung. Tagungsband 12. Jahrestagung der Gesellschaft für Klassifikation, Darmstadt 17.-19.3.1988. Hrsg.: R. Wille
-
Eastman, C.M.: Overlaps in postings to thesaurus terms : a preliminary study (1988)
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- Abstract
- The patterns of overlap between terms which are closely related in a thesaurus are considered. The relationships considered are parent/child, in which one term is a broader term of the other, and sibling in which to 2 terms share the same broader term. The patterns of overlap observed in the MeSH thesaurus with respect to selected MEDLINE postings are examined. The implications of the overlap patterns are discussed, in particular, the impact of the overlap patterns on the potential effectiveness of a proposed algorithm for handling negation is considered.
- Date
- 25.12.1995 22:52:34
- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Foskett, D.J.: Thesaurus (1980)
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- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Buchan, R.L.: Intertwining thesauri and dictionaries (1989)
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- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Wells, D.: Which is the most beautiful? (1988)
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- Abstract
- Präsentation einer Liste der schönsten mathematischen Formeln und Sätze (s. Abbildung)
- Footnote
- Vgl. das Ergebnis in: Mathematical intelligencer 12(1990) no.3, S.37-41
-
McMath, C.F.; Tamaru, R.S.; Rada, R.: ¬A graphical thesaurus-based information retrieval system (1989)
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- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Sager, J.C.: Terminological thesaurus : a more appropriate designation or a deprecated synonym? (1982)
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- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Sridhar, M.S.: ¬A mathematical approach to relations in thesauri (1980)
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- Abstract
- Presents a brief background of set theory and relations including equivalence and ordering relations. Proposes four working hypotheses concerned with thesauri relations (USE, UF, NT, BT, GS & RT) and examines these relations against the characteristics of relations defined in mathematics. Explores the possibility of generating equivalence class of descritors from a single descriptor to aid information/document retrieval. provides a new mathematical approach to thesaurus and its relations and compares it against traditional way of representing thesaurus. Proposes new areas for investigation in this direction
- Footnote
- Vgl. auch die Beiträge (mit tw. abweichender Argumentation) von G. Beling: Towards a set theoretical foundation of classification und W. Gödert: Zum Problem der Äquivalenzrelation in Dokumentationssprachen und Schönfeldt
-
Austin, D.: PRECIS: Introduction (1987)
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- Footnote
- Zusammenfassende kompakte Darstellung des Systems PRECIS, seiner Geschichte, Eigenschaften und Möglichkeiten bis hin zum Online-Retrieval. - Als Einführung zu empfehlen
-
Dailey, J.E.: Subject headings (1980)
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- Abstract
- Enthält Geschichte der Library of Congress Subject Headings und Sears' list
-
Maniez, J.: Relationships in thesauri : some critical remarks (1988)
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- Abstract
- After reviewing some fundamental distinctions in relationships (paradigmatic/sytagmatic, interconceptual/ structural) the author proposes a functional approach for investigating the relationships in thesauri. The comparison between three closely related types of semantic fields (lexical, conceptual, thesaural) shows the specific function of relationships in all of these intellectual tools. In information retrieval the two main functions are location of relevant concepts and search of exhaustivity. a clear distinction of these aims can contribute to solving the difficult problem of the choice of 'related terms'. It is suggested that their usefulness relies upon empirical rather than upon semantic proximity. Some practical propositions are amde for the choice and display of relationships in thesauri
- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Rada, R.: Connecting and evaluating thesauri : issues and cases (1987)
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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
- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Mooers, C.N.: ¬The indexing language of an information retrieval system (1985)
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- Abstract
- Calvin Mooers' work toward the resolution of the problem of ambiguity in indexing went unrecognized for years. At the time he introduced the "descriptor" - a term with a very distinct meaning-indexers were, for the most part, taking index terms directly from the document, without either rationalizing them with context or normalizing them with some kind of classification. It is ironic that Mooers' term came to be attached to the popular but unsophisticated indexing methods which he was trying to root out. Simply expressed, what Mooers did was to take the dictionary definitions of terms and redefine them so clearly that they could not be used in any context except that provided by the new definition. He did, at great pains, construct such meanings for over four hundred words; disambiguation and specificity were sought after and found for these words. He proposed that all indexers adopt this method so that when the index supplied a term, it also supplied the exact meaning for that term as used in the indexed document. The same term used differently in another document would be defined differently and possibly renamed to avoid ambiguity. The disambiguation was achieved by using unabridged dictionaries and other sources of defining terminology. In practice, this tends to produce circularity in definition, that is, word A refers to word B which refers to word C which refers to word A. It was necessary, therefore, to break this chain by creating a new, definitive meaning for each word. Eventually, means such as those used by Austin (q.v.) for PRECIS achieved the same purpose, but by much more complex means than just creating a unique definition of each term. Mooers, however, was probably the first to realize how confusing undefined terminology could be. Early automatic indexers dealt with distinct disciplines and, as long as they did not stray beyond disciplinary boundaries, a quick and dirty keyword approach was satisfactory. The trouble came when attempts were made to make a combined index for two or more distinct disciplines. A number of processes have since been developed, mostly involving tagging of some kind or use of strings. Mooers' solution has rarely been considered seriously and probably would be extremely difficult to apply now because of so much interdisciplinarity. But for a specific, weIl defined field, it is still weIl worth considering. Mooers received training in mathematics and physics from the University of Minnesota and the Massachusetts Institute of Technology. He was the founder of Zator Company, which developed and marketed a coded card information retrieval system, and of Rockford Research, Inc., which engages in research in information science. He is the inventor of the TRAC computer language.
- Footnote
- Nachdruck des Originalartikels mit Kommentierung durch die Herausgeber
Original in: Information retrieval today: papers presented at an Institute conducted by the Library School and the Center for Continuation Study, University of Minnesota, Sept. 19-22, 1962. Ed. by Wesley Simonton. Minneapolis, Minn.: The Center, 1963. S.21-36.
- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Somers, H.L.: Observations on standards and guidelines concerning thesaurus construction (1981)
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- Abstract
- An attempt is made to compare the existing standards and guidelines for thesaurus consruction and development, focussing particularly on the ISO, BSI standards as well as on the guidelines suggested by Aitchison and Gilchrist, and UNISIST. The different facets/aspects considered are: linguistic aspects of thesauri; formal requirements suggested by the standards/guidelines with special emphasis on problems associated with the compound terms, homographs, forms of terms, etc.; semantic relationships between terms - synonymy, BT/NT, and associativity; problems peculiar to multilingual thesauri, especially the problem of inexact equivalence between terms; and presentation and arrangement of terms in a thesaurus
- Theme
- Konzeption und Anwendung des Prinzips Thesaurus
-
Vasiljev, A.: ¬The law of requisite variety as applied to subject indexing and retrieval (1989)
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- Source
- Klassifikation und Ordnung. Tagungsband 12. Jahrestagung der Gesellschaft für Klassifikation, Darmstadt 17.-19.3.1988. Hrsg.: R. Wille
