Describes an information retrieval methodology based on relevance weighting of search terms in pairs of documents. The vector space model of information retrieval is reviewed, the Bayesian model of text retrieval is discussed, and an automatic implementation of weight estimation using the Medline database is described. (16 references) (LRW)

Discussion of clustering of documents and queries in information retrieval systems focuses on the use of a genetic algorithm to adapt subject descriptions so that documents become more effective in matching relevant queries. Various types of clustering are explained, and simulation experiments used to test the genetic algorithm are described. (27…

Describes a new method for automatic indexing and retrieval called latent semantic indexing (LSI). Problems with matching query words with document words in term-based information retrieval systems are discussed, semantic structure is examined, singular value decomposition (SVD) is explained, and the mathematics underlying the SVD model is…

Describes the Belief Function Model for automatic indexing and ranking of documents which is based on a controlled vocabulary and on term frequencies in each document. Belief Function Theory is explained, and the Belief Function Model is compared to the Standard Vector Space Model. (17 references) (LRW)

An experiment to compute and analyze the degree of association between descriptors used to index a document collection of approximately 40,000 records is described. An analysis of the results is presented which indicates the difficulties inherent in applying the results to an operating system. (11 references) (Author)

Describes the development of a structural model of document retrieval based on lexical-semantic relationships between index terms. An algorithm that uses tree-to-tree distance to measure structural closeness between a document and a query statement is explained, and the proposed model is compared to a vector retrieval model. (18 references) (LRW)

Discussion of the vector space model and properties of document and query spaces focuses on the proof that requiring term independence to hold in the query space is inconsistent with the goal of achieving better performance by means of weighted retrieval. Proofs are provided. (Author/LRW)

This thesis describes work done as part of the Video Console Indexing Project (VICI), a program to improve the quality and reduce the time and work involved in indexing documents. The objective of the work described was to design a video terminal system which could be connected to a main computer to provide rapid natural communication between the…

Discusses automatic document classification and document retrieval systems and presents a strategy for building a morphological machine dictionary of English that infers meaning of derivations by considering morphological affixes and their semantic classification. Proposes a method for selecting compound field association terms from a large pool…

These two articles introduce a new model of probablistic information retrieval (PIR) that is based on the statistical technique of the combination of expert opinion (CEO), which in this model is the opinions of indexers and users. Part 1 presents the conceptual basis, while Part 2 explains the mathematical details. (73 references) (LRW)

In order to carry out its project for a mechanized documentation service based on a system of keyword coordination, European Atomic Energy Community's Centre for Information and Documentation was led to draw up an inventory of terminology in the nuclear field and maintain a tight control over it. A basic thesaurus of 1230 keywords was drawn up and…

Comprehensive rules, guidelines, and examples are provided for use by ERIC indexers and lexicographers in creating and using Identifiers, and in developing and maintaining the ERIC Identifier file via the "Identifier Authority List (IAL)." Identifiers and the IAL are defined/described: Identifiers are highly specific entities, including…

Comprehensive rules, guidelines, and examples are provided for use by ERIC indexers and lexicographers in creating and using Identifiers, and in developing and maintaining the ERIC Identifier file via the "Identifier Authority List (IAL)." Identifiers and the IAL are defined/described: Identifiers are highly specific entities, including…

The objectives of the seminar were to report on: (1) the American Institute of Physics (AIP) Universal Decimal Classification (UDC) project work; (2) the UDC work, trends and opinions in Germany, the United Kingdom and other countries and (3) the production and development of UDC schedules and indexes, and Perreault's work on "relators." Twelve of…

This thesaurus is a list of descriptors and identifiers for the international indexing and retrieving of documents and data in the field of education. The descriptors are placed in seven broad fields; context terms, administration and research terms, instructional terms, people, growing and learning, content, and things. The terms of each field…