1,720,979 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
IMRT for postoperative treatment of gastric cancer: Covering large target volumes in the upper abdomen: A comparison of a step-and-shoot and an ARC therapy approach
No full textPurpose: Data from the randomized Intergroup Trial 116 suggest effectiveness of adjuvant radiochemotherapy in patients with advanced gastric cancer. Late toxicity, however, especially with respect to the kidneys, may pose significant longtime problems. Intensity-modulated radiotherapy (IMRT) may reduce toxicity to organs at risk. To evaluate the relative merits of different IMRT approaches, we performed a plan comparison between a step-and-shoot class solution and an AP-PA setup, a conventional box technique and the Peacock tomotherapy approach. Methods and Materials: Computed tomographies and structure data from 15 patients who had been treated postoperatively for advanced (T3/T4/N+) gastric cancer at our department formed the basis of our plan comparison study. For each patient data set, 5 plans or plan combinations (conventional 3D plan, AP-PA plan, step-and-shoot IMRT, tomotherapy with 1-cm or 2-cm collimation) were chosen, and evaluation was performed for a total dose of 45 Gy delivered as the median dose to the target. volume for each plan or plan combination. Results: Median kidney dose generated from the IMRT plans is reduced individually by >50% for the kidney with the highest exposure (usually the left kidney) from 20 to 30 Gy with conventional 3D planning down to values between 8 and 10 Gy for IMRT. On average, median dose to the right kidney is the same for the conventional box technique and IMRT (between 8 and 10 Gy) but lower for the AP-PA technique. In 3 patients, kidney dose might have been ablative for both kidneys with both the AP-PA technique and the box technique, whereas it was acceptable with IMRT. Median dose to the liver was subcritical with all modalities but lowest with AP-PA fields. Differences between step-and-shoot IMRT and tomotherapy plans are small when compared to the differences between IMRT plans and conventional conformal 3D plans. For some patients, however, their body and target diameters obviate treatment with tornotherapy. Treatment time for the step-and-shoot approach and for tornotherapy with 2-cm collimation can be kept <20 min. Conclusions: For postoperative radiotherapy of advanced gastric cancer, step-and-shoot IMRT as well as tornotherapy can deliver efficient doses to target volumes while delivering dose to the kidneys in a fashion that is different from a conventional technique and is clearly advantageous in a small number of patients. An advantage for the majority of patients is likely with the normal tissue complication probability data presented in this series, but, given the uncertainty of the reaction of the kidney to inhomogeneous dose distributions, cannot be considered unequivocal at the moment. Different technical limitations apply to the different IMRT techniques. The choice of approach is therefore determined by departmental circumstances. (C) 2004 Elsevier Inc
Current Requirements for Image Management in Radiotherapy – Treatment/Oncology Management and Radiation Therapy Picture Archival and Communication Systems (TMS, OIS, RT-PACS)
No full textkoamabayili/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
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