摘要:

AbstractA method of preparing a sample of journal issues for testing purposes is described. A computer file was created by listing every issue of a set of journals, and random samples of the issues were selected by computer and printed out. It is suggested that the method could be applied to a variety of tests of journal availability, delivery and use.

ISSN:0002-8231    

DOI:10.1002/asi.4630260502

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1975

数据来源: WILEY

摘要:

AbstractAn existing model of the circulation subsystem of a library has been modified to explicitly include renewals and to describe a semester loan policy. An extensive amount of experimental data have been obtained by recording the history of all books which circulated from Sears Library at Case Western Reserve University during the fall semester, 1973. These data, which characterize various aspects of user behavior, in combination with a numerical statement of the loan policy of the library serve as input parameters for the model which simulates the events that occur in the circulation subsystem. The results of the simulation provide information about the availability of books and the delay associated with recalls.These results have been compared to experimental observation. The agreement between the predicted values and the experimental observation is good. Thus the validity of the model is demonstrated, and the model is used to simulate various alternative loan policies. The effect of these alternatives on book availability is also given.

ISSN:0002-8231    

DOI:10.1002/asi.4630260503

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1975

数据来源: WILEY

摘要:

AbstractIn Part I of this study,* a mixture of two Poisson distributions was examined as a model of specialty word distribution. Formulas expressing the three parameters of the model in terms of empirical frequency statistics were derived, and a statistical measure intended to identify specialty words, consistent with the model, was proposed.In the present paper, Part II of the study, a probabilistic model of keyword indexing is outlined, and some of the consequences of the model are examined. An algorithm defining a measure of indexability is developed‐a measure intended to reflect the relative significance of words in documents. The measure is evaluated and is found to consistently produce indexes superior to those produced by another measure which had previously been identified in the literature as producing the best result

ISSN:0002-8231    

DOI:10.1002/asi.4630260504

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1975

数据来源: WILEY

摘要:

AbstractInterdisciplinarity in Canadian science is considered from the point of view of the interaction of significant Canadian journals. Most of these journals cite themselves primarily, and journals in other or related sciences receive few citations. As a result, it can be concluded that the degree of interdisciplinarity, as determined by this measure, is very low in Canadian science.

ISSN:0002-8231    

DOI:10.1002/asi.4630260505

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1975

数据来源: WILEY

摘要:

AbstractTechnical innovation in the field of information includes the design and implementation of large on‐line automated systems for the retrospective search of scientific literature. An example of such technology is the MEDLINE bibliographic service of the National Library of Medicine which, with its 200 terminals, serves the biomedical scientific and professional community throughout the country.In the initial phase of the MEDLINE development, users of seven MEDLINE information centers were investigated in terms of characteristics, motivations, purposes and expectations in using the service. The study attempts to clarify the role of MEDLINE in basic and clinical research, and in the education and training of biomedical personnel. Some of the factors involved in the adoption of an innovation are analyze

ISSN:0002-8231    

DOI:10.1002/asi.4630260506

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1975

数据来源: WILEY

ISSN:0002-8231    

DOI:10.1002/asi.4630260507

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1975

数据来源: WILEY

ISSN:0002-8231    

DOI:10.1002/asi.4630260510

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1975

数据来源: WILEY

ISSN:0002-8231    

DOI:10.1002/asi.4630260512

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1975

数据来源: WILEY

ISSN:0002-8231    

DOI:10.1002/asi.4630260501

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1975

数据来源: WILEY