The way in which computer algebra systems, such as Maple, have made the study of complex problems accessible to undergraduate mathematicians with modest computational skills is illustrated by some large matrix calculations, which arise from representing the Earth's surface by digital elevation models. Such problems are often considered to lie in…

Proposes and explains a new mechanism for controlling the access requests in information protection systems that is based on Newton's interpolating polynomial. Access control matrices are discussed; single-key-lock systems are described; relevant algorithms are explained; and an example of the new mechanism is included. (10 references) (LRW)

Discusses the role of certain types of classifications in a modern automated environment. (Author/PF)

Presents principles for determining profile of a system user based on analysis of co-occurrence of index terms in queries and pertinent documents. A procedure for determining index term weights, the information value of which depends on the degree of homogeneity of system users, is introduced. Three references are cited. (EJS)

Discusses the difficulty of managing rapidly changing and expanding information technologies. A conceptual matrix for managing technology-related variables is presented, and examples of using the matrix for decision making are given. The resulting improvements in communications, systems integration, and strategic planning are discussed, as well as…

Two journal-to-journal matrices for psychology in 1950 and 1960 are analyzed in terms of structural equivalence to test following hypotheses: that journals of a discipline function as a status-role relational system; that interdisciplinary journals are distant from journals of a field; that journal networks have a core-periphery structure. (26…

Describes experiments relating information to decision making. The experiments were developed to validate previously suggested conceptual model of information flow and its relation to decision making and to establish specific values for significant parameters involved. Background and summary of recent research and experimental design and research…

A state educational indicator system being developed by the Pennsylvania Educational Policy Studies (PEPS) project at the University of Pittsburgh (Pennsylvania) is described. The extensive database that has been established as part of the PEPS project includes thousands of variables that are descriptive of the 500 Pennsylvania school districts.…

This publication reporting the responses of 92 Association of Research Libraries (ARL) members to an automation inventory survey conducted in March 1985 was generated from a database developed by ARL to provide timely, comparable information about the extent and nature of automation within the ARL library community. Among operational systems, the…

Based on information and data from 113 Association of Research Libraries (ARL) members that were gathered and updated between March and August 1986, this publication was generated from a database developed by ARL to provide timely, comparable information about the extent and nature of automation within the ARL community. Trends in automation are…

This inventory provides profiles, tables, and listings of automated library activities at 115 Association of Research Libraries (ARL) institutions. The library profile covers 18 functions: (1) acquisitions; (2) serials check/claim; (3) serials/union list; (4) authority control; (5) cataloging/utility; (6) cataloging/local; (7) circulation; (8)…