Diese Datenbank enthält ca. 39.000 Dokumente zu Themen aus den Bereichen Formalerschließung – Inhaltserschließung – Information Retrieval.
© 2015 W. Gödert, TH Köln, Institut für Informationswissenschaft / Powered by litecat, BIS Oldenburg (Stand: 19. Oktober 2016)
1Lamb, I. ; Larson, C.: Shining a light on scientific data : building a data catalog to foster data sharing and reuse.
In: Code4Lib journal. Issue 32(2016), [http://journal.code4lib.org].
Abstract: The scientific community's growing eagerness to make research data available to the public provides libraries - with our expertise in metadata and discovery - an interesting new opportunity. This paper details the in-house creation of a "data catalog" which describes datasets ranging from population-level studies like the US Census to small, specialized datasets created by researchers at our own institution. Based on Symfony2 and Solr, the data catalog provides a powerful search interface to help researchers locate the data that can help them, and an administrative interface so librarians can add, edit, and manage metadata elements at will. This paper will outline the successes, failures, and total redos that culminated in the current manifestation of our data catalog.
Inhalt: Vgl.: http://journal.code4lib.org/articles/11421.
Themenfeld: Informetrie ; Visualisierung
2Maflahi, N. ; Thelwall, M.: When are readership counts as useful as citation counts? : Scopus versus Mendeley for LIS journals.
In: Journal of the Association for Information Science and Technology. 67(2016) no.1, S.191-199.
Abstract: In theory, articles can attract readers on the social reference sharing site Mendeley before they can attract citations, so Mendeley altmetrics could provide early indications of article impact. This article investigates the influence of time on the number of Mendeley readers of an article through a theoretical discussion and an investigation into the relationship between counts of readers of, and citations to, 4 general library and information science (LIS) journals. For this discipline, it takes about 7 years for articles to attract as many Scopus citations as Mendeley readers, and after this the Spearman correlation between readers and citers is stable at about 0.6 for all years. This suggests that Mendeley readership counts may be useful impact indicators for both newer and older articles. The lack of dates for individual Mendeley article readers and an unknown bias toward more recent articles mean that readership data should be normalized individually by year, however, before making any comparisons between articles published in different years.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23369/abstract.
Wissenschaftsfach: Bibliothekswesen ; Informationswissenschaft
Objekt: Mendeley ; Scopus
3Bertin, M. ; Atanassova, I. ; Gingras, Y. ; Larivière, V.: ¬The invariant distribution of references in scientific articles.
In: Journal of the Association for Information Science and Technology. 67(2016) no.1, S.164-177.
Abstract: The organization of scientific papers typically follows a standardized pattern, the well-known IMRaD structure (introduction, methods, results, and discussion). Using the full text of 45,000 papers published in the PLoS series of journals as a case study, this paper investigates, from the viewpoint of bibliometrics, how references are distributed along the structure of scientific papers as well as the age of these cited references. Once the sections of articles are realigned to follow the IMRaD sequence, the position of cited references along the text of articles is invariant across all PLoS journals, with the introduction and discussion accounting for most of the references. It also provides evidence that the age of cited references varies by section, with older references being found in the methods and more recent references in the discussion. These results provide insight into the different roles citations have in the scholarly communication process.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23367/abstract.
4Gómez-Núñez, A.J. ; Vargas-Quesada, B. ; Moya-Anegón, F. de: Updating the SCImago journal and country rank classification : a new approach using Ward's clustering and alternative combination of citation measures.
In: Journal of the Association for Information Science and Technology. 67(2016) no.1, S.178-190.
Abstract: This study introduces a new proposal to refine the classification of the SCImago Journal and Country Rank (SJR) platform by using clustering techniques and an alternative combination of citation measures from an initial 18,891 SJR journal network. Thus, a journal-journal matrix including simultaneously fractionalized values of direct citation, cocitation, and coupling was symmetrized by cosine similarity and later transformed into distances before performing clustering. The results provided a new cluster-based subject structure comprising 290 clusters that emerge by executing Ward's clustering in two phases and using a mixed labeling procedure based on tf-idf scores of the original SJR category tags and significant words extracted from journal titles. In total, 13,716 SJR journals were classified using this new cluster-based scheme. Although more than 5,000 journals were omitted in the classification process, the method produced a consistent classification with a balanced structure of coherent and well-defined clusters, a moderated multiassignment of journals, and a softer concentration of journals over clusters than in the original SJR categories. New subject disciplines such as "nanoscience and nanotechnology" or "social work" were also detected, providing evidence of good performance of our approach in refining the journal classification and updating the subject classification structure.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23370/abstract.
Objekt: SCImago Journal and Country Rank
5Haustein, S. ; Bowman, T.D. ; Holmberg, K. ; Tsou, A. ; Sugimoto, C.R. ; Larivière, V.: Tweets as impact indicators : Examining the implications of automated "bot" accounts on Twitter.
In: Journal of the Association for Information Science and Technology. 67(2016) no.1, S.232-238.
Abstract: This brief communication presents preliminary findings on automated Twitter accounts distributing links to scientific articles deposited on the preprint repository arXiv. It discusses the implication of the presence of such bots from the perspective of social media metrics (altmetrics), where mentions of scholarly documents on Twitter have been suggested as a means of measuring impact that is both broader and timelier than citations. Our results show that automated Twitter accounts create a considerable amount of tweets to scientific articles and that they behave differently than common social bots, which has critical implications for the use of raw tweet counts in research evaluation and assessment. We discuss some definitions of Twitter cyborgs and bots in scholarly communication and propose distinguishing between different levels of engagement-that is, differentiating between tweeting only bibliographic information to discussing or commenting on the content of a scientific work.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23456/abstract.
6Moed, H.F. ; Halevi, G.: On full text download and citation distributions in scientific-scholarly journals.
In: Journal of the Association for Information Science and Technology. 67(2016) no.2, S.412-431.
Abstract: A statistical analysis of full text downloads of articles in Elsevier's ScienceDirect covering all disciplines reveals large differences in download frequencies, their skewness, and their correlation with Scopus-based citation counts, between disciplines, journals, and document types. Download counts tend to be 2 orders of magnitude higher and less skewedly distributed than citations. A mathematical model based on the sum of two exponentials does not adequately capture monthly download counts. The degree of correlation at the article level within a journal is similar to that at the journal level in the discipline covered by that journal, suggesting that the differences between journals are, to a large extent, discipline specific. Despite the fact that in all studied journals download and citation counts per article positively correlate, little overlap may exist between the set of articles appearing in the top of the citation distribution and that with the most frequently downloaded ones. Usage and citation leaks, bulk downloading, differences between reader and author populations in a subject field, the type of document or its content, differences in obsolescence patterns between downloads and citations, and different functions of reading and citing in the research process all provide possible explanations of differences between download and citation distributions.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23405/abstract.
Themenfeld: Informetrie ; Elektronisches Publizieren
7Li, J. ; Shi, D.: Sleeping beauties in genius work : when were they awakened?.
In: Journal of the Association for Information Science and Technology. 67(2016) no.2, S.432-440.
Abstract: "Genius work," proposed by Avramescu, refers to scientific articles whose citations grow exponentially in an extended period, for example, over 50 years. Such articles were defined as "sleeping beauties" by van Raan, who quantitatively studied the phenomenon of delayed recognition. However, the criteria adopted by van Raan at times are not applicable and may confer recognition prematurely. To revise such deficiencies, this paper proposes two new criteria, which are applicable (but not limited) to exponential citation curves. We searched for genius work among articles of Nobel Prize laureates during the period of 1901-2012 on the Web of Science, finding 25 articles of genius work out of 21,438 papers including 10 (by van Raan's criteria) sleeping beauties and 15 nonsleeping-beauties. By our new criteria, two findings were obtained through empirical analysis: (a) the awakening periods for genius work depend on the increase rate b in the exponential function, and (b) lower b leads to a longer sleeping period.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23380/abstract.
8Kuan, C.-H. ; Liu, J.S.: ¬A new approach for main path analysis : decay in knowledge diffusion.
In: Journal of the Association for Information Science and Technology. 67(2016) no.2, S.465-476.
Abstract: Main path analysis is a powerful tool for extracting the backbones of a directed network and has been applied widely in bibliometric studies. In contrast to the no-decay assumption in the traditional approach, this study proposes a novel technique by assuming that the strength of knowledge decays when knowledge contained in one document is passed on to another document down the citation chain. We propose three decay models, arithmetic decay, geometric decay, and harmonic decay, along with their theoretical properties. In general, results of the proposed decay models depend largely on the local structure of a citation network as opposed to the global structure in the traditional approach. Thus, the significance of citation links and the associated documents that are overemphasized by the global structure in the traditional no-decay approach is treated more properly. For example, the traditional approach commonly assigns high value to documents that heavily reference others, such as review articles. Specifically in the geometric and harmonic decay models, only truly significant review articles will be included in the resulting main paths. We demonstrate this new approach and its properties through the DNA literature citation network.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23384/abstract.
9Dobrota, M. ; Dobrota, M.: ARWU ranking uncertainty and sensitivity : what if the award factor was Excluded?.
In: Journal of the Association for Information Science and Technology. 67(2016) no.2, S.480-482.
Abstract: The Academic Ranking of World Universities (ARWU) uses six university performance indicators, including "Alumni" and "Awards"-the number of alumni and staff winning Nobel Prizes and Fields Medals. These two indicators raised doubts about the reliability of this ranking method because they are difficult to cope with. Recently, a newsletter was published featuring a reduced ARWU ranking list, leaving out Nobel Prize and Fields Medal indicators: the Alternative Ranking (Excluding Award Factor). We used uncertainty and sensitivity analyses to examine and compare the stability and confidence of the official ARWU ranking and the Alternative Ranking. The results indicate that if the ARWU ranking is reduced to the 4-indicator Alternative Ranking, it shows greater certainty and stability in ranking universities.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23527/abstract.
Anmerkung: Autoren: Milan Dobrota und Marina Dobrota
10Herb, U.: Ablehnungsquoten wissenschaftlicher Journale.
Abstract: Je höher die Ablehnungsrate eines wissenschaftlichen Journals, desto exklusiver aus Sicht von Autoren das Privileg einer akzeptierten Einreichung. Und - so die Annahme - umso größer die Qualität der publizierenden Journale. Eine Untersuchung widerspricht nun dieser landläufigen Meinung und spielt in die Hände von Kritikern wie Prof. Gerhard Fröhlich von der Universität Linz, der Ablehnungsquoten als reinen Prestigeschmuck ansieht.
Themenfeld: Elektronisches Publizieren ; Informetrie
11Torres-Salinas, D. ; Robinson-García, N.: ¬The time for bibliometric applications.
In: Journal of the Association for Information Science and Technology. 67(2016) no.4, S.1014-1015.
(Letter to the editor)
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23604/abstract.
12Radev, D.R. ; Joseph, M.T. ; Gibson, B. ; Muthukrishnan, P.: ¬A bibliometric and network analysis of the field of computational linguistics.
In: Journal of the Association for Information Science and Technology. 67(2016) no.3, S.683-706.
Abstract: The ACL Anthology is a large collection of research papers in computational linguistics. Citation data were obtained using text extraction from a collection of PDF files with significant manual postprocessing performed to clean up the results. Manual annotation of the references was then performed to complete the citation network. We analyzed the networks of paper citations, author citations, and author collaborations in an attempt to identify the most central papers and authors. The analysis includes general network statistics, PageRank, metrics across publication years and venues, the impact factor and h-index, as well as other measures.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23394/abstract.
Themenfeld: Informetrie ; Computerlinguistik
13Yan, S. ; Rousseau, R. ; Huang, S.: Contributions of chinese authors in PLOS ONE.
In: Journal of the Association for Information Science and Technology. 67(2016) no.3, S.543-549.
Abstract: Beginning with a short review of Public Library of Science (PLOS) journals, we focus on PLOS ONE and more specifically the contributions of Chinese authors to this journal. It is shown that their contribution is growing exponentially. In 2013 almost one fifth of all publications in this journal had at least one Chinese author. The average number of citations per publication is approximately the same for articles with a Chinese author and for articles without any Chinese coauthor. Using the odds-ratio, we could not find arguments that Chinese authors in PLOS ONE excessively cite other Chinese contributions.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23400/abstract.
Objekt: PLOS ONE
14Kousha, K. ; Thelwall, M.: Can Amazon.com reviews help to assess the wider impacts of books?.
In: Journal of the Association for Information Science and Technology. 67(2016) no.3, S.566-581.
Abstract: Although citation counts are often used to evaluate the research impact of academic publications, they are problematic for books that aim for educational or cultural impact. To fill this gap, this article assesses whether a number of simple metrics derived from Amazon.com reviews of academic books could provide evidence of their impact. Based on a set of 2,739 academic monographs from 2008 and a set of 1,305 best-selling books in 15 Amazon.com academic subject categories, the existence of significant but low or moderate correlations between citations and numbers of reviews, combined with other evidence, suggests that online book reviews tend to reflect the wider popularity of a book rather than its academic impact, although there are substantial disciplinary differences. Metrics based on online reviews are therefore recommended for the evaluation of books that aim at a wide audience inside or outside academia when it is important to capture the broader impacts of educational or cultural activities and when they cannot be manipulated in advance of the evaluation.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23404/abstract.
15Mongeon, P. ; Larivière, V.: Costly collaborations : the impact of scientific fraud on co-authors' careers.
In: Journal of the Association for Information Science and Technology. 67(2016) no.3, S.535-542.
Abstract: Over the past few years, several major scientific fraud cases have shocked the scientific community. The number of retractions each year has also increased tremendously, especially in the biomedical field, and scientific misconduct accounts for more than half of those retractions. It is assumed that co-authors of retracted papers are affected by their colleagues' misconduct, and the aim of this study is to provide empirical evidence of the effect of retractions in biomedical research on co-authors' research careers. Using data from the Web of Science, we measured the productivity, impact, and collaboration of 1,123 co-authors of 293 retracted articles for a period of 5 years before and after the retraction. We found clear evidence that collaborators do suffer consequences of their colleagues' misconduct and that a retraction for fraud has higher consequences than a retraction for error. Our results also suggest that the extent of these consequences is closely linked with the ranking of co-authors on the retracted paper, being felt most strongly by first authors, followed by the last authors, with the impact is less important for middle authors.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23421/abstract.
16Zhao, D. ; Strotmann, A.: Dimensions and uncertainties of author citation rankings : lessons learned from frequency-weighted in-text citation counting.
In: Journal of the Association for Information Science and Technology. 67(2016) no.3, S.671-682.
Abstract: In-text frequency-weighted citation counting has been seen as a particularly promising solution to the well-known problem of citation analysis that it treats all citations equally, be they crucial to the citing paper or perfunctory. But what is a good weighting scheme? We compare 12 different in-text citation frequency-weighting schemes in the field of library and information science (LIS) and explore author citation impact patterns based on their performance in these schemes. Our results show that the ranks of authors vary widely with different weighting schemes that favor or are biased against common citation impact patterns-substantiated, applied, or noted. These variations separate LIS authors quite clearly into groups with these impact patterns. With consensus rank limits, the hard upper and lower bounds for reasonable author ranks that they provide suggest that author citation ranks may be subject to something like an uncertainty principle.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23418/abstract.
17Donner, P.: Enhanced self-citation detection by fuzzy author name matching and complementary error estimates.
In: Journal of the Association for Information Science and Technology. 67(2016) no.3, S.662-670.
Abstract: In this article I investigate the shortcomings of exact string match-based author self-citation detection methods. The contributions of this study are twofold. First, I apply a fuzzy string matching algorithm for self-citation detection and benchmark this approach and other common methods of exclusively author name-based self-citation detection against a manually curated ground truth sample. Near full recall can be achieved with the proposed method while incurring only negligible precision loss. Second, I report some important observations from the results about the extent of latent self-citations and their characteristics and give an example of the effect of improved self-citation detection on the document level self-citation rate of real data.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23399/abstract.
18Leydesdorff, L. ; Bornmann, L.: ¬The operationalization of "fields" as WoS subject categories (WCs) in evaluative bibliometrics : the cases of "library and information science" and "science & technology studies".
In: Journal of the Association for Information Science and Technology. 67(2016) no.3, S.707-714.
Abstract: Normalization of citation scores using reference sets based on Web of Science subject categories (WCs) has become an established ("best") practice in evaluative bibliometrics. For example, the Times Higher Education World University Rankings are, among other things, based on this operationalization. However, WCs were developed decades ago for the purpose of information retrieval and evolved incrementally with the database; the classification is machine-based and partially manually corrected. Using the WC "information science & library science" and the WCs attributed to journals in the field of "science and technology studies," we show that WCs do not provide sufficient analytical clarity to carry bibliometric normalization in evaluation practices because of "indexer effects." Can the compliance with "best practices" be replaced with an ambition to develop "best possible practices"? New research questions can then be envisaged.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23408/abstract.
Wissenschaftsfach: Bibliothekswesen ; Informationswissenschaft
Hilfsmittel: Web of Science
19Rodríguez-Navarro, A.: Research assessment based on infrequent achievements : a comparison of the United States and Europe in terms of highly cited papers and Nobel Prizes.
In: Journal of the Association for Information Science and Technology. 67(2016) no.3, S.731-740.
Abstract: Scientific progress is driven by important, infrequent discoveries that cannot be readily identified and quantified, which makes research assessment very difficult. Bibliometric indicators of important discoveries have been formulated using an empirical approach, based on the mathematical properties of the high-citation tail of the citation distribution. To investigate the theoretical basis of such formulations this study compares the US/European research performance ratios expressed in terms of highly cited papers and Nobel Prize-winning discoveries. The research performance ratio in terms of papers was studied from the citation distributions in the fields of chemistry, physics, and biochemistry and molecular biology. It varied as a function of the citation level. Selecting an appropriate high citation level, the ratios in terms of highly cited papers were compared with the corresponding ratios for Nobel Prize-winning discoveries in Chemistry, Physics, and Physiology or Medicine. Research performance ratios expressed in terms of highly cited papers and Nobel Prize-winning discoveries are reasonably similar, and suggest that the research success of the United States is almost 3 times that of Europe. A similar conclusion was obtained using articles published in Nature and Science.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23412/abstract.
Land/Ort: EU ; USA
20Leydesdorff, L. ; Heimeriks, G. ; Rotolo, D.: Journal portfolio analysis for countries, cities, and organizations : maps and comparisons.
In: Journal of the Association for Information Science and Technology. 67(2016) no.3, S.741-748.
Abstract: Using Web of Science data, portfolio analysis in terms of journal coverage can be projected onto a base map for units of analysis such as countries, cities, universities, and firms. The units of analysis under study can be compared statistically across the 10,000+ journals. The interdisciplinarity of the portfolios is measured using Rao-Stirling diversity or Zhang et?al.'s improved measure 2D3. At the country level we find regional differentiation (e.g., Latin American or Asian countries), but also a major divide between advanced and less-developed countries. Israel and Israeli cities outperform other nations and cities in terms of diversity. Universities appear to be specifically related to firms when a number of these units are exploratively compared. The instrument is relatively simple and straightforward, and one can generalize the application to any document set retrieved from the Web of Science (WoS). Further instruction is provided online at http://www.leydesdorff.net/portfolio.
Inhalt: Vgl.: http://onlinelibrary.wiley.com/doi/10.1002/asi.23551/abstract.
Hilfsmittel: Web of Science