1,721,189 research outputs found
Radioactive Nuclear Beams, Proceedings of the Seventh International Conference on Radioactive Nuclear Beams (RNB7), Cortina dâ€TMAmpezzo, 2-7 July 2006, Eur. Phys. J ST
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Assessment of qualitative tests
No full textFor qualitative (2-class) tests, which provide binary (yes/no) information, the correctness of specimen classification remains the most important criterion for performance evaluation. However, a more informative picture emerges from the relationship between percentage of positive results and analyte concentration, which allows some inherent test characteristics to be derived (the positive/negative discrimination concentration and the "grey zone" around it). The information content of evaluation approaches is decidedly improved by the availability of numerical results (counts per minute, absorbance) in most situations of clinical interest. The concentration/response functions underlying the quality of individual tests may thus be derived and compared, and laboratory staff given a more objective criterion to judge individual performance. Examples are drawn from the authors' experience in running external quality assessment programs for tests for infectivity markers
Critical aspects of bayesian analysis: The imprecision in performance assessing and the choice of decision limits
No full textUsing as an experimental model the results obtained in assaying thyroid hormones and tumor markers, two peculiar aspects of the Bayesian analysis are considered: (a) the imprecision associated with the assessment of diagnostic sensitivity, specificity and predictive value, and (b) the implications of the choice of the cutoff point (ie, the medical decision limit). As for the former aspect, still largely disregarded in the literature, no significant difference results when applying binomial statistics or the "bootstrap" resampling technique for uncertainty evaluations; the critical effects on the imprecision extent related to the size of available statistical samples and of the cutoff value are confirmed, no effect being instead related to the extent of distribution skewness. The choice of decision limit (eg, the limit corresponding to the maximum efficiency, to the maximum Youden's index or to a given specificity) obviously proves crucial in establishing the diagnostic value of test results; furthermore, the use of maximum-efficiency cutoff points looks questionable when low prevalences are concerned. Thus, rather than from some rigid criteria, this choice should proceed from a comparative analysis of operational curves obtained for given cutoff values, such as the functions prevalence vs predictive value or prevalence vs misclassification rate
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Authoring the 'Intelligence' of an Educational Game
No full textIn this paper, we describe a frame-based production rules system that works ad the Artificial intelligence Engine of an educational computer game. We discuss the need of an authoring environment clearly separated by the game in order to allow a technical staff without any skills in either AI or Computer Science to encode the intelligence of the game. Finally, we briefly introduce two graphical interfaces for authoring and testing frame hierarchies and production rules. The production rule system and the authoring tool have been developed in the context of a project funded by the European Community to develop a prototypical educational computer gam
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