1,721,033 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
Assessment of Right Gastroepiploic Artery Graft by Transcutaneous Doppler Ultrasonography
No full textRecently skeletonization by the ultrasonic scalpel has been recognized as a method of harvesting arterial graft including the gastroepiploic artery (GEA) for coronary artery bypass grafting. The purpose of this study was to evaluate the efficacy of transcutaneous ultrasonography during assessment of skeletonized GEA grafts. Twenty five patients including 22 men and 3 women (mean age, 63 years; range, 47 to 84 years) underwent off-pump coronary artery bypass grafting using GEA between August 2003 and April 2004. After 3 to 28 weeks of the operation, GEA was detected on the liver surface under the guidance of the color Doppler ultrasonography. The GEA diameter, blood flow waveform, peak velocity and average velocity were measured, after that blood flow was calculated. Blood flow was detected in all 25 GEAs. Blood flow waveform showed only forward flow in 24 GEAs. In one case, forward and backward flow waveform was observed. GEA diameter was 3.1 ± 0.7mm, average flow velocity was 14.0 ± 5.1cm/s, blood flow was 80.5 ± 43ml/min. This study suggests that the transcutaneous ultrasonography proved to be a noninvasive and convenient method to evaluate postoperative skeletonized GEA
15-year Follow up of Right Gastroepiploic Artery Grafting in Pediatric Patients with Kawasaki Disease
No full textCoronary artery bypass grafting (CABG) for children with severe coronary artery damage due to Kawasaki disease (KD) has been performed since 1974. Initially, the saphenous vein served as the principal conduit. However saphenous vein graft patency was found to decline sharply during the first few years after surgery. Using the internal thoracic artery (ITA) improved graft patency rate after CABG. In 1988, we first successfully applied the GEA for revascularization to the distal portion, where ITA was difficult to reach. Here, we are reporting the progress, after 15 years, of two KD patients with GEA grafting. They underwent CABG using GEA at 7 and 11 years, respectively, and demonstrated normal growth and development during follow up. Angiographic examination 10 years after CABG, showed excellent patent GEA in one case. In the second case, flow competition with native coronary blood flow supplied from collateral flow from the left coronary artery was observed. The long-term effects of KD are still not well known. There have also been few reports concerned with the long-term results of GEA grafting in KD patients
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
Thirty Years Experience of Coronary Artery Bypass Grafting in Patients with Kawasaki Disease
No full textThis study focused on assessing the clinical outcome of coronary artery bypass grafting (CABG) in patients with Kawasaki disease (KD). Thirty eight patients (mean age, 8.8 years), including 30 male and 8 female, under-went CABG. The number of bypass grafts was 1.7 per patient. Only saphenous vein (SV) was used for graft in 9 patients in the first stage from 1976 to 1983. SV and internal thoracic artery (ITA) were used in 11 patients in the second stage from 1984 to 1987. SV, ITA, and gastroepiploic artery were used in 18 patients in the third stage after 1988. The patency rate for grafts at one month after surgery was 86, 100, and 97%, and at one and three years, 58, 61, and 94% in the first, second, and third stages, respectively. Late sudden death occurred in five patients including two adult cases. Second operations were performed in two patients with in-situ arterial grafts by off pump CABG. Total arterial grafting is preferable in CABG of KD. Patients should be followed carefully and sever exercise and stress inducing activities should be avoided to prevent sudden death. Redo surgery is also feasible using arterial conduits and off pump CABG
Sequential Grafting of the Skeletonized Gastroepiploic Artery in Off-Pump Coronary Artery Bypass Surgery
No full textFrom 2002, our standard strategy for coronary revascularization was off-pump coronary artery bypass grafting (OPCAB). The gastroepiploic artery (GEA) was used as an in situ arterial grafts for multiple vessel revascularization. This study was to review the skeletonized GEA sequential grafting in OPCAB. Thirty-eight patients (32 males, aged 44 to 80 years) underwent sequential grafting of the skeletonized GEA in OPCAB between January 2002 and December 2004. The GEA was harvested in complete skeletonized fashion using an ultrasonic scalpel. The dissected GEA was placed on the antegastric and antehepatic route and led into pericardial space. The GEAs were anastomosed to the right coronary artery brunches in 25 cases and the right and the left circumflex artery brunches in 10 cases. Overall, 74 distal anastomoses were done using in situ GEAs. There were no inhospital deaths among the study patients. The patency rate of the GEAs was 97% (72 of 74 distal anastmoses) on postoperative angiogram. Two terminal anastomoses of sequential grafts were occluded. The flow competition between the coronary artery was noted in the terminal segment in 3 cases. The acceptable early clinical and angiographic outcome suggests the GEA sequential grafting is safe and effective for multiple coronary revascularization
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
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