1,721,064 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Non-invasive quantitative myocardial perfusion assessment
No full text\u3cp\u3eA computer-readable medium, a device and a method for the quantitative assess,emt pf cardiac perfusion. A myocardium depicted on a series of cardiac images is divided into im age segments, wherein the image segment comprises at least one image pixel. Then a cardiac perfusion parameter is determined for each of said image segments. Then at least one image segment with a normal perfusion parameter value is selected. Subsequently cardiac perfusion parameters of the remaining image segments are based on said normal perfusion parameter value of said image segment with normal perfusion. According to an embodiment, the perfusion parameter is a maximum upslope of a time-intensity profile for distribution of a contrast agent in said myocardium. A normal maximum upslope is derived for at least one image segment and a relative maximum upslope is calculated for each segment with relation to the normal maximum upslope. Based on these values, a ratio of myocardial perfusion parameters derived at stress and myocardial perfusion parameters derived at rest for each segment may be calculated. For example a myocardial perfusion reserve index (MPRI) is calculated for each image segment as a ratio of the relative maximum upslopes derived at rest and at stress .\u3c/p\u3
A method of geometrical distortion correction in 3d images
No full text\u3cp\u3eA method of correcting local distortions in 3D images, particularly medical 3D images, caused by a scanning system used for acquisition of the 3D images, is disclosed. According to an embodiment, a 3D phantom containing reference structures that are positioned at known reference positions is scanned. Then the resulting positions of the phantom reference structures in the 3D image are detected and the 3D image is subdivided into 3D sub- volumes, called patches. Subsequently the detected positions of the reference structures are compared to the known reference positions for each patch, and for each patch having distortions existing between known reference and detected positions, the distortion is described with a local 3D transformation according to the invention. Finally, medical images that are subsequently scanned are corrected with the local 3D transformations.\u3c/p\u3
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