Diese Datenbank enthält über 40.000 Dokumente zu Themen aus den Bereichen Formalerschließung – Inhaltserschließung – Information Retrieval.
© 2015 W. Gödert, TH Köln, Institut für Informationswissenschaft / Powered by litecat, BIS Oldenburg (Stand: 28. April 2022)
1Hood, W.W. ; Wilson, C.S.: ¬The relationship of records in multiple databases to their usage or citedness.
In: Journal of the American Society for Information Science and Technology. 56(2005) no.9, S.1004-1007.
Abstract: Papers in journals are indexed in bibliographic databases in varying degrees of overlap. The question has been raised as to whether papers that appear in multiple databases (highly overlapping) are in any way more significant (such as being more highly cited) than papers that are indexed in few databases. This paper uses a dataset from fuzzy set theory to compare low overlap papers with high overlap ones, and finds that more highly overlapping papers are in fact more highly cited.
2Hood, W.W. ; Wilson, C.S.: Overlap in bibliographic databases.
In: Journal of the American Society for Information Science and technology. 54(2003) no.12, S.1091-1103.
Abstract: Bibliographic databases contain surrogates to a particular subset of the complete set of literature; some databases are very narrow in their scope, while others are multidisciplinary. These databases overlap in their coverage of the literature to a greater or lesser extent. The topic of Fuzzy Set Theory is examined to determine the overlap of coverage in the databases that index this topic. It was found that about 63% of records in the data set are unique to only one database, and the remaining 37% are duplicated in from two to 12 different databases. The overlap distribution is found to conform to a Lotka-type plot. The records with maximum overlap are identified; however, further work is needed to determine the significance of the high level of overlap in these records. The unique records are plotted using a Bradford-type form of data presentation and are found to conform (visually) to a hyperbolic distribution. The extent and causes of intra-database duplication (records duplicated in the one database) are also examined. Finally, the overlap in the top databases in the dataset were examined, and a high correlation was found between overlapping records, and overlapping DIALOG OneSearch categories.
3Hood, W.W. ; Wilson, C.S.: Solving problems in library and information science using Fuzzy set theory.
In: Library trends. 50(2002) no.3, S.393-405.
Abstract: Various mathematical tools and theories have found application in Library and Information Science (LIS). One of these is Fuzzy Set Theory (FST). FST is a generalization of classical Set Theory, designed to better model situations where membership of a set is not discrete but is "fuzzy." The theory dates from 1965, when Lotfi Zadeh published his seminal paper on the topic. As well as mathematical developments and extensions of the theory itself, there have been many applications of FST to such diverse areas as medical diagnoses and washing machines. The theory has also found application in a number of aspects of LIS. Information Retrieval (IR) is one area where FST can prove useful; this paper reviews IR applications of FST. Another major area of Information Science in which FST has found application is Informetrics; these studies are also reviewed. A few examples of the use of this theory in non-LIS domains are also examined.
Anmerkung: Artikel in einem Themenheft "Current theory in library and information science"
Wissenschaftsfach: Bibliothekswesen ; Informationswissenschaft
4Hood, W.W. ; Wilson, C.S.: ¬The scatter of documents over databases in different subject domains : how many databases are needed?.
In: Journal of the American Society for Information Science and technology. 52(2001) no.14, S.1242-1254.
Abstract: The distribution of bibliographic records in on-line bibliographic databases is examined using 14 different search topics. These topics were searched using the DIALOG database host, and using as many suitable databases as possible. The presence of duplicate records in the searches was taken into consideration in the analysis, and the problem with lexical ambiguity in at least one search topic is discussed. The study answers questions such as how many databases are needed in a multifile search for particular topics, and what coverage will be achieved using a certain number of databases. The distribution of the percentages of records retrieved over a number of databases for 13 of the 14 search topics roughly fell into three groups: (1) high concentration of records in one database with about 80% coverage in five to eight databases; (2) moderate concentration in one database with about 80% coverage in seven to 10 databases; and (3) low concentration in one database with about 80% coverage in 16 to 19 databases. The study does conform with earlier results, but shows that the number of databases needed for searches with varying complexities of search strategies, is much more topic dependent than previous studies would indicate.
Themenfeld: Informetrie ; Retrievalstudien