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1Gil-Leiva, I. ; Lopes Fujita, M.S. ; Díaz Ortuño, P.M. ; Reis, D.M. dos: Is the massive incorporation of e-books into university libraries devaluing the technical processes related to the assigning of subject headings and classification codes?.
In: Challenges and opportunities for knowledge organization in the digital age: proceedings of the Fifteenth International ISKO Conference, 9-11 July 2018, Porto, Portugal / organized by: International Society for Knowledge Organization (ISKO), ISKO Spain and Portugal Chapter, University of Porto - Faculty of Arts and Humanities, Research Centre in Communication, Information and Digital Culture (CIC.digital) - Porto. Eds.: F. Ribeiro u. M.E. Cerveira. Baden-Baden : Ergon Verlag, 2018. S.314-320.
(Advances in knowledge organization; vol.16)
2Gil-Leiva, I.: SISA-automatic indexing system for scientific articles : experiments with location heuristics rules versus TF-IDF rules.
In: Knowledge organization. 44(2017) no.3, S.139-162.
Abstract: Indexing is contextualized and a brief description is provided of some of the most used automatic indexing systems. We describe SISA, a system which uses location heuristics rules, statistical rules like term frequency (TF) or TF-IDF to obtain automatic or semi-automatic indexing, depending on the user's preference. The aim of this research is to ascertain which rules (location heuristics rules or TF-IDF rules) provide the best indexing terms. SISA is used to obtain the automatic indexing of 200 scientific articles on fruit growing written in Portuguese. It uses, on the one hand, location heuristics rules founded on the value of certain parts of the articles for indexing such as titles, abstracts, keywords, headings, first paragraph, conclusions and references and, on the other, TF-IDF rules. The indexing is then evaluated to ascertain retrieval performance through recall, precision and f-measure. Automatic indexing of the articles with location heuristics rules provided the best results with the evaluation measures.
Inhalt: Beitrag in einem Special Issue "New Trends for Knowledge Organization, Guest Editor: Renato Rocha Souza ".
Themenfeld: Automatisches Indexieren
3Souza, R.R. ; Gil-Leiva, I.: Automatic indexing of scientific texts : a methodological comparison.
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 27-29 September 2016, Rio de Janeiro, Brazil / organized by International Society for Knowledge Organization (ISKO), ISKO-Brazil, São Paulo State University ; edited by José Augusto Chaves Guimarães, Suellen Oliveira Milani, Vera Dodebei. Würzburg : Ergon Verlag, 2016. S.243-250.
(Advances in knowledge organization; vol.15)
Themenfeld: Automatisches Indexieren
4Gil-Leiva, I. ; Alonso-Arroyo, A.: Keywords given by authors of scientific articles in database descriptors.
In: Journal of the American Society for Information Science and Technology. 58(2007) no.8, S.1175-1187.
Abstract: In this article, the authors analyze the keywords given by authors of scientific articles and the descriptors assigned to the articles to ascertain the presence of the keywords in the descriptors. Six-hundred forty INSPEC (Information Service for Physics, Engineering, and Computing), CAB (Current Agriculture Bibliography) abstracts, ISTA (Information Science and Technology Abstracts), and LISA (Library and Information Science Abstracts) database records were consulted. After detailed comparisons, it was found that keywords provided by authors have an important presence in the database descriptors studied; nearly 25% of all the keywords appeared in exactly the same form as descriptors, with another 21% though normalized, still detected in the descriptors. This means that almost 46% of keywords appear in the descriptors, either as such or after normalization. Elsewhere, three distinct indexing policies appear, one represented by INSPEC and LISA (indexers seem to have freedom to assign the descriptors they deem necessary); another is represented by CAB (no record has fewer than four descriptors and, in general, a large number of descriptors is employed). In contrast, in ISTA, a certain institutional code exists towards economy in indexing because 84% of records contain only four descriptors.
Wissenschaftsfach: Physik ; Agrarwissenschaften ; Bibliothekswesen ; Informationswissenschaft ; Informatik
Objekt: INSPEC ; ISTA ; LISA ; CAB
5Pulgarin, A. ; Gil-Leiva, I.: Bibliometric analysis of the automatic indexing literature : 1956-2000.
In: Information processing and management. 40(2004) no.2, S.365-377.
Abstract: We present a bibliometric study of a corpus of 839 bibliographic references about automatic indexing, covering the period 1956-2000. We analyse the distribution of authors and works, the obsolescence and its dispersion, and the distribution of the literature by topic, year, and source type. We conclude that: (i) there has been a constant interest on the part of researchers; (ii) the most studied topics were the techniques and methods employed and the general aspects of automatic indexing; (iii) the productivity of the authors does fit a Lotka distribution (Dmax=0.02 and critical value=0.054); (iv) the annual aging factor is 95%; and (v) the dispersion of the literature is low.
Themenfeld: Informetrie ; Automatisches Indexieren
6Gil-Leiva, I. ; Munoz, J.V.R.: Analisis de los descriptores de diferentes areas del conocimiento indizades en bases de datos del CSIC : Aplicacion a la indizacion automatica.
In: Revista Española de Documentaçion Cientifica. 20(1997) no.2, S.150-160.
Abstract: Studies the value of scientific articles' titles and abstracts as sources of terms for document indexing in relation to 6 areas of knowledge: library and information science, medicine, chemistry, biology, psychology and physics, indexed in the databases ISOC, IME and ICYT of the CSIC. Also examines the syntagmatic structures of the indexing terms found in the field 'descriptors'. as well as the relationship between length of document and number of descriptors. Concludes that if the abstracts are not well made and the titles are not precise, they are not definitive sources for the extractions of concepts; the most common syntactic structure is the noun phrase, followed by noun+adjective and noun+noun; and no significant relationship was found between length of document and number of descriptors assigned to it
Anmerkung: Übers. d. Titels: Descriptors analysis on different knowledge ares in CSIC databases: application on automatic indexing
Themenfeld: Automatisches Indexieren
Wissenschaftsfach: Physik ; Chemie ; Medizin ; Psychologie ; Biologie ; Informationswissenschaft ; Bibliothekswesen
7Gil-Leiva, I. ; Munoz, V.R.: ¬Los origines del almacenamiento y recuperacion de informacion.
In: Boletin de la Asociacion Andaluza de Bibliotecarios. 12(1996) no.42, S.9-18.
Abstract: Descriptive account of the rudimentary techniques used to organise documentation materials in the earliest libraries, covering Mesopotamia about 4.000 BC, for the creation of colophons, labels and catalogues; Egypt about 2.000 BC, for papyrus rolls with title at the end and labels in red ink; and classical Greece and Rome, for the catalogues in the library at Alexandria, and private and public libraries in Rome in the 1st century AD using classification by content
Anmerkung: Übers. des Titels: Origins of information storage and retrieval
Themenfeld: Geschichte der Sacherschließung