1,721,000 research outputs found
Fully parallel Runge-Kutta-Nystrom methods for ODEs with oscillating solutions
No full textFully parallel Runge-Kutta-Nyström methods are introduced and their properties of accuracy, stability, and dispersion are investigated. Fully parallel Runge-Kutta-Nyström methods with two and three stages are constructed
A parallel Runge-Kutta-Nystrom code for y"=f(t,y)
No full textA parallel code for the numerical solution of second order ordinary differential systems without first derivative is developed, The code is mainly designed for solving large stiff systems with oscillatory solutions which require only a moderate accuracy, Then it can be specially useful to integrate systems arising from semi-discretization of second order hyperbolic partial derivative equations.
The code is designed for distributed connection, with a ring topology, It is coded in parallel Fortran and uses the communication system EXPRESS.
The code is robust, reliable and efficient, and achieves almost ideal values of speed-up and efficiency; and it is freely available on http://www.unisa.it/beapat.dir/soft/
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
First Italian Consensus Conference on VATS lobectomy for NSCLC
No full textVideo-assisted thoracoscopic surgery (VATS) lobectomy has become an accepted procedure for the treatment of selected cases of lung cancer. The aim of this project was to establish national practical recommendations for the management of patients suitable for VATS lobectomy. The Scientific Committee of the VATS Lobectomy Group (a branch of the Italian Society of Thoracic Surgery) identified the consensus conference as an appropriate tool for a national debate. The consensus conference was organized following indications of the Italian Department of Health: a panel of experts reviewed the literature, the jury board revised the experts’ reports, and the national conference discussed and voted on statements. The strength of recommendation for a statement was classified as weak, fair, or high when the total score ranged between 51% and 67%, 68% and 84%, or 85% and 100%, respectively. Eighty-six Italian thoracic surgeons attended the 1st Italian Consensus Conference on VATS lobectomy in Giulianova, Italy, on October 29-30, 2015. Thirty-three topics were discussed: indications, surgical strategy, perioperative management, and training were the main topics. Consensus was reached on 24 statements that were consequently recommended. The Italian Consensus Conference is the first attempt to discuss VATS lobectomy-related issues in a national scientific community. Such experience determined an improvement in epistemic knowledge among the Italian thoracic surgeons and could be a suggestion for other national communities
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
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
- …
