Literatur zur Informationserschließung
Diese Datenbank enthält über 40.000 Dokumente zu Themen aus den Bereichen Formalerschließung – Inhaltserschließung – Information Retrieval.
© 2015 W. Gödert, TH Köln, Institut für Informationswissenschaft
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1Raghavan, K.S. ; Ravichandra Rao, I.K. ; Bhargav, K.N.: Knowledge organization in a multidisciplinary domain: case study of forensic science.
In: Knowledge organization for a sustainable world: challenges and perspectives for cultural, scientific, and technological sharing in a connected society : proceedings of the Fourteenth International ISKO Conference 2729 September 2016, Rio de Janeiro, Brazil / organized by International Society for Knowledge Organization (ISKO), ISKOBrazil, São Paulo State University ; edited by José Augusto Chaves Guimarães, Suellen Oliveira Milani, Vera Dodebei. Würzburg : Ergon Verlag, 2016. S.411419.
(Advances in knowledge organization; vol.15)

2Egghe, L. ; Ravichandra Rao, I.K.: Study of different hindices for groups of authors.
In: Journal of the American Society for Information Science and Technology. 59(2008) no.8, S.12761281.
Abstract: In this article, for any group of authors, we define three different hindices. First, there is the successive hindex h2 based on the ranked list of authors and their hindices h1 as defined by Schubert (2007). Next, there is the hindex hP based on the ranked list of authors and their number of publications. Finally, there is the hindex hC based on the ranked list of authors and their number of citations. We present formulae for these three indices in Lotkaian informetrics from which it also follows that h2 < hp < hc. We give a concrete example of a group of 167 authors on the topic optical flow estimation. Besides these three hindices, we also calculate the twobytwo Spearman rank correlation coefficient and prove that these rankings are significantly related.
Themenfeld: Informetrie
Objekt: hindex

3Egghe, L. ; Ravichandra Rao, I.K.: ¬The influence of the broadness of a query of a topic on its hindex : models and examples of the hindex of ngrams.
In: Journal of the American Society for Information Science and Technology. 59(2008) no.10, S.16881693.
(Brief communication)
Abstract: The article studies the influence of the query formulation of a topic on its hindex. In order to generate pure random sets of documents, we used Ngrams (N variable) to measure this influence: strings of zeros, truncated at the end. The used databases are WoS and Scopus. The formula h=T**1/alpha, proved in Egghe and Rousseau (2006) where T is the number of retrieved documents and is Lotka's exponent, is confirmed being a concavely increasing function of T. We also give a formula for the relation between h and N the length of the Ngram: h=D10**(N/alpha) where D is a constant, a convexly decreasing function, which is found in our experiments. Nonlinear regression on h=T**1/alpha gives an estimation of , which can then be used to estimate the hindex of the entire database (Web of Science [WoS] and Scopus): h=S**1/alpha, , where S is the total number of documents in the database.
Themenfeld: Informetrie
Objekt: hindex

4Ravichandra Rao, I.K. ; Sahoo, B.B.: Studies and research in informetrics at the Documentation Research and Training Centre (DRTC), ISI Bangalore.
In: Knowledge organization, information systems and other essays: Professor A. Neelameghan Festschrift. Ed. by K.S. Raghavan and K.N. Prasad. New Delhi : Ess Ess Publications, 2006. S.489502.
Abstract: Contributions of DRTC to informetric studies and research are discussed. A report on recent work  a quantitative countrywise analysis of software literature based on the data from two bibliographic databases i.e. COMPENDEX and INSPEC is presented. The number of countries involved in R & D activities in software in the most productive group is increasing. The research contribution on software is decreasing in developed countries as compared to that in developing and less developed countries. India 's contribution is only 1.1% and it has remained constant over the period of 12 years 19892001. The number of countries involved in R&D activities in software has been increasing in the 1990s. It is also noted that higher the budget for higher education, higher the number of publications; and that higher the number of publications, higher the export as well as the domestic consumption of software.
Themenfeld: Informetrie
Land/Ort: Indien ; Bangalore

5Egghe, L. ; Ravichandra Rao, I.K.: Duality revisited : construction of fractional frequency distributions based on two dual Lotka laws.
In: Journal of the American Society for Information Science and technology. 53(2002) no.10, S.789801.
Abstract: Fractional frequency distributions of, for example, authors with a certain (fractional) number of papers are very irregular and, therefore, not easy to model or to explain. This article gives a first attempt to this by assuming two simple Lotka laws (with exponent 2): one for the number of authors with n papers (total count here) and one for the number of papers with n authors, n E N. Based an an earlier made convolution model of Egghe, interpreted and reworked now for discrete scores, we are able to produce theoretical fractional frequency distributions with only one parameter, which are in very close agreement with the practical ones as found in a large dataset produced earlier by Rao. The article also shows that (irregular) fractional frequency distributions are a consequence of Lotka's law, and are not examples of breakdowns of this famous historical law.
Themenfeld: Informetrie
Objekt: LotkaGesetz

6Ravichandra Rao, I.K. ; Neelameghan, A.: From librametry to informetrcis : an overview and Ranganathan's contributions.
In: Libri. 42(1992) no.3, S.242257.

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