1,720,973 research outputs found
Conflitto versus competizione. Una possibile questione di lana caprina all'interno della riflessione sull'esperienza giuridica
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A knowledge based system for geophysical data interpretation
No full textThe issue of automating the interpretation of data in geophysical exploration by means of artificial intelligence and pattern recognition techniques is addressed. The main features of the knowledge adopted by a domain expert are outlined and used as the basis for the design of a knowledge-based system named Horizons that will support the stratigraphic interpretation of seismic data. The architecture of the system is presented, including generation, validation, consistency-maintenance, and control modules, all designed as cooperating intelligent units. A prototype version of Horizons is presented, and results are briefly discusse
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
An assessment of the efficiency of a stereological correction for recovering the volumetric grade of particles from measures on polished sections
No full textAn application of the kernel-based inversion method for recovering the volumetric grade distribution of an assembly of particles from computer generated areal grade measures is presented. The application involves: 1. generation of a spatial mineral texture of a mineralized rock sample. 2. derivation of the (volumetric) liberation spectrum of the particulate resulting from the simulation of the sample fragmentation. 3. calculation of the inversion kernel based on measures of areal grade made on the intersection of random testing planes with the particles generated. 4. generation of areal measures on a virtual polished section. 5. solving the inversion problem for comparison of the recovered volumetric distribution with the original (simulated) liberation spectrum. The whole process allows to evaluate the efficiency of the inversion method achieved with an exact kernel and the suitability of the mathematical methods used for the inversion and their statistical significance; a plain (by number of occurrences) kernel and a weighted kernel (each occurrence counted with its area) are used. A hybrid recovering method is proposed that uses an estimator of second moments of the volumetric grade to provide a starting solution that is further improved with a weighted dampen least squares regularization procedure. The numerical procedure does not require the assumption of the hypothesis of random uniform isotropic fragmentation (RUIF) and can be applied to cases with mineral and gangue of different brittleness. The statistical reliability of the recovered volumetric distribution that depends upon the goodness of the distribution of the areal measures gathered on the polished section and the regularization used for inversion is also studied
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
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