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Clason, W.E.: ¬Die Klassifizierung der Literatur nach dem System der gleichwertigen Grundbegriffe (UNITERM-System) : ein Erfahrungsbericht aus der Praxis (1957)
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- Source
- Nachrichten für Dokumentation. 8(1957) H.1, S.27-29
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Rogers, R.D.: Subject bibliography versus subject catalog and periodical index (1950)
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Anker, J.: Some principles of a systematically arranged subject catalogue with an index (1956)
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Kluth, R.: System - Notation - Leitkarten (1955)
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Orvig, M.: ¬The reader interest arrangement : an american shelving system with a future (1955)
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Mogk, H.: System und Schlagwort : Erfahrungen am Fachkatalog der Universitätsbibliothek Leipzig (1954)
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Jackson, I.H.: Advantages and disadvantages of a Subject System of Classification as a key to a depository collection (1951)
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Kreithen, A.; Gull, C.D.; Miller, E.E.: Klassifizierung nach dem System gleichwertiger Grundbegriffe (Uniterm) (1954)
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Walker, R.S.: Problem child : some observations on fiction, with a sketch of a new system of classification (1958)
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Farradane, J.E.L.: ¬A scientific theory of classification and indexing and its practical applications (1950)
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- Abstract
- A classification is a theory of the structure of knowledge. From a discussion of the nature of truth, it is held that scientific knowledge is the only knowledge which can be regarded as true. The method of induction from empirical data is therefore applied to the construction of a classification. Items of knowledge are divided into uniquely definable terms, called isolates, and the relations between them, called operators. It is shown that only four basic operators exist, expressing appurtenance, equivalence, reaction and causation; using symbols for these operators, all subjects can be analysed in a linear form called an analet. With the addition of the permissible permutations of such analets, formed according to simple rules, alphabetical arrangement of the first terms provide a complete, logical subject index. Examples are given, and possible difficulties are considered. A classification can then be constructed by selection of deductive relations, arranged in hierarchical form. The nature of possible classifications is discussed. It is claimed that such an inductively constructed classification is the only true representation of the structure of knowledge, and that these principles provide a simple technique for accurately and fully indexing and classifying any given set of data, with complete flexibility
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Bar-Hillel, Y.; Carnap, R.: ¬An outline of a theory of semantic information (1952)
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- Abstract
- In distinction to current Theory of Communication which treats amount of information as a measure of the statistical rarity of a message, a Theory of Semantic Information is outlined, in which the concept of information carried by a sentence within a given language system is treated as synonymous with the content of this sentence, normalized in a certain way, and the concept of amount of semantic information is explicated by various measures of this content, all based on logical probability functions ranging over the contents. Absolute and relative measures are distinguished, so are D-functions suitable for contexts where deductive reasoning alone is relevant and I-functions suitable for contexts where inductive reasoning is adequate. Of the two major types of amount of information investigated, the one, cont, is additive with respect to sentences whose contents are exclusive, the other, inf, with respect to sentences which are inductively independent. The latter turns out to be formally analogous to the customary information measure function. Various estimate functions of amount of information are investigated leading to generalized semantic correlates of concepts and theorems of current Communication Theory. A concept of semantic noise is tentatively defined, so are efficiency and redundancy of the conceptual framework of a language system. It is suggested that semantic information is a concept more readily applicable to psychological and other investigations than its communicational counterpart.
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Mills, J.: Classification of a subject field (1957)
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- Pages
- S.29-42
