1,720,988 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
Small bowel obstruction after gastric by-pass: Diagnostic limits and percutaneous drain. A paradigmatic case
No full textBackground: Obesity is showing a constant increase worldwide, making it the major public health problem. Bariatric surgery seems to be the best treatment for these to achieve a good excess weight loss. Gastric by-pass (GBP) is one the most important bariatric procedure, but there are a lot of complications as bowel obstruction for internal hernia, fistula and intussusception. Case report: We present a peculiar case report of a 53-years old woman that underwent to GBP. On the fourth postoperative day, she presented a bowel obstruction and underwent a second surgical intervention for incisional hernia. Another surgical revision was necessary because of dilatation of excluded stomach. Subsequent external drain of excluded stomach solved the paralytic ileum post bowel obstruction. Conclusion: Postoperative occlusion is more complex in bariatric patients, either for variety of etiology, either for choosing best approach to the new anatomy. In addition, post-surgery course may be different, because GBP may determine many modifications on gastrointestinal motility and clinical symptoms. An accurate knowledge of bariatric surgery is mandatory in these situations, obtaining the best management
Visual defects and ageing
No full textMany diseases are related to age, among these neurodegeneration is particularly important. Alzheimer’s disease Parkinson’s and Glaucoma have many common pathogenic events including oxidative damage, Mitochondrial dysfunction, endothelial alterations and changes in the visual field. These are well known in the case of glaucoma, less in the case of neurodegeneration of the brain. Many other molecular aspects are common, such as the role of endoplasmic reticulum autophagy and neuronal apoptosis while others have been neglected due to lack of space such as inflammatory cytokine or miRNA. Moreover, the loss of specific neuronal populations, the induction of similar mechanisms of cell injury and the deposition of protein aggregates in specific anatomical areas are very similar events between these diseases. Intracellular and/or extracellular accumulation of protein aggregates is a key feature of many neurodegenerative disorders. The existence of abnormal protein aggregates has been documented in the RGCs of glaucomatous patients such as the anomalous Tau protein or the β-amyloid accumulations. Intra-cell catabolic processes also appear to be common in both glaucoma and neurodegeneration. They also help us to understand how the basis between these diseases is common and how the visual aspects can be a serious problem for those who are affected
Abdominoplasty after bariatric surgery: Comparison of three different techniques
No full textBACKGROUND: Abdominoplasty after massive weight loss is not a cosmetic procedure. The aim of this study was to compare three different techniques for postbariatric abdominoplasty. METHODS: All postbariatric patients that have undergone abdominoplasty from January 2013 to December 2016 were included in the study. Patients were divided into 3 groups: Subjects who underwent standard procedure were allocated ingroup A; those cases performed using a synthetic glue were assigned to group B; cases performed with an energy device were inserted in group C. Operative time, length of stay and complications were recorded. RESULTS: Seventy-one abdominoplasties were performed in the selected period. Mean operative time was shorter (P<0.01) in group C (94.3±2.7 minutes) than in group A(112.1±16.8 minutes) and in group B (121±13.2 minutes). Mean length of stay was significantly reduced (P<0.01) in group C (2.4±0.7) when compared to group A (3.5±0.6 days) and group B (3.1±0.5 days). Bleeding occurred in 21 (29.5%) patients (15 in group A, 4 in groupB, 3 in group C; P<0.01). Seroma was detected in 22(30.9%) subjects (14 in group A, 2in group B, 6 in group C; P<0.01). Wound dehiscence and umbilical necrosis were recorded in 7 (9.9%) and 9 (12.6%) patients respectively, without statistical differences. CONCLUSIONS: Both synthetic glue and energy device improve outcomes of postbariatric abdominoplasties. The glue reduces rates of bleeding and seroma. The energy deviceimproves intraoperative hemostasis and shortens operative time. copy
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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