1,721,090 research outputs found
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
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
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
Radiation therapy of ocular melanoma: pre-clinical experience.
No full textSeveral methods have been developed to treat ocular melanomas and trials are ongoing to obtain reliable data to ascertain the superiority of one treatment over the other in terms of local control, overall survival and frequency of side effects. In spite of the fact that enucleation is accepted to treat the larger tumours the use of radioactive plaques or proton beam irradiation are used in specialised centres and a large experience has been gained with their use. Proton beams are employed in different centres scattered all over the world and have demonstrated their superiority with respect to conventional photon or plaque irradiation. Protons have, in fact, a minimal scattering, a well defined range in tissues and may be collimated in small fields delivering most of their energy at the end of the pre-defined track.
Pre-clinical experience is reviewed with particular attention to the determination of the RBE (Relative Biological Effectiveness) of the protons in comparison to 2 MV photons and to the clinical and histological modifications produced by a collimated modulated and unmodulated beam of protons. Collimated proton beams produce circumscribed areas of chorioretinal scarring without any other Ion a-term serious complications that are usually associated with other radiation therapy modalities. In particular the well demarcated area of chorioretinal scarring present a border 0.5-1.0 mm) with transient modifications immediately surrounded by normal retina. No optic nerve damage is noticed and no serious complication is detected in the anterior segment of the eye
Scintimammography for the detection of breast cancer
No full textScintimammography Is a functional imaging technique whereby radionuclide tracers In the patient's breasts are observed with a radiation-defection camera (gamma-camera). Tracers are designed to accumulate in tumors more than In healthy tissue; the most common tracers used to date are Tc-99m sestamibi and Tc-99m tetrofosmin. Scintimammography is useful In some clinical Indications as an adjunct to mammography and to reduce the rates of negative biopsies, and it is recommended for lesions where additional Information is required to reach a definitive diagnosis. Patients with equivocal mammograms may benefit from this test, as well as women with dense breasts and those with Implants, since scintigraphy is not affected by breast density and the photons arising from the radiotracer are not overly attenuated by Implants. Scintimammography is also of value In patients with locally advanced breast cancer, for monitoring and predicting the response to neoadjuvant chemotherapy. The near availability of high-resolution breast-dedicated cameras will allow the suboptimal sensitivity In detecting cancers of less than 1 cm to be improved; this is currently the main limitation of scintimammography. These new devices also have the potential to Increase the number of breast scintigraphies performed and the role of nuclear medicine In breast cancer imaging
Radiobiology as a basic and clinical medical science: What the physicists have forgotten
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