1,720,995 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
Robotic Liver Resection Expands the Opportunities of Bridging Before Liver Transplantation
No full textRobotic Left Hepatectomy with en bloc Caudatectomy and Multiple Biliary Anastomosis for Perihilar Cholangiocarcinoma
No full textImproving Outcomes Defending Patient Safety: The Learning Journey in Robotic Liver Resections
Get PDFBackground. While laparoscopy is currently adopted for hepatic resections, robotic approaches to the liver have not gained wide acceptance. We decided to analyze the learning curve in the field of robotic liver surgery comparing short-term outcomes between the first and the second half of our series. Methods. We retrospectively reviewed demographics and clinical data of patients who underwent robotic liver resection at our institution from July 2014 through September 2017. 60 patients diagnosed with primary or secondary liver neoplasms or hydatid disease were included in this study. ASA PS >3, heart failure, respiratory insufficiency, and general contraindication to pneumoperitoneum were exclusion criteria. Results. 60 patients were included. We observed a statistically significant decrease in operative time (p<0.001), intraoperative blood loss (p=0.01), and postoperative complications (p<0.001) after 30 cases. From the interpretation of the CUSUM curve, the time of operation appears to be significantly reduced after the first 30 operations. Discussion. This is the first European analysis of the learning curve for robotic liver resection in an HPB and liver transplant referral center. However, more studies are needed to confirm such results outside a HPB referral center. This is crucial to develop formal credentialing protocols for both junior and senior surgeons
The COVID-19 second wave risk and liver transplantation: lesson from the recent past and the unavoidable need of living donors
No full textRobotic liver partition and portal vein embolization for staged hepatectomy for perihilar cholangiocarcinoma
No full textPerihilar cholangiocarcinoma (pCCA) is one of the most complex challenges for hepatobiliary surgeons. Poor results and high incidence of morbidity after Associating Liver Partition and Portal vein ligation for Staged hepatectomy (ALPPS) for pCCA discouraged this indication. It has been proposed that minimally invasive approach for ALPPS first stage, as well as combination of surgical liver partition and radiologic portal vein embolization (PVE), may improve outcomes reducing interstage morbidity. We report a case of right trisectionectomy with enbloc caudatectomy ALPPS scheduled for pCCA with robotic approach at stage-1, the full video is provided as supplementary material. Due to intraoperative presence of portal vein tumor infiltration during hilar dissection (no evidence in the pre-operative work-up), a radiologic right PVE was performed after stage-1 instead of portal vein ligation, followed by portal vein resection and biductal hepatico-jejunostomy at stage-2 with open approach. The patient was a 74-year-old female diagnosed with 3-cm mass-forming pCCA. The total clean liver volume was 1231 cc, with future liver remnant (FLR) volume of 25.1% (segments II and III). She was discharged in the interstage interval on postoperative day (POD) 4; CT scan on POD 12 showed that FLR increased up to 33% (369 cc) (Fig. 1). ALPPS was completed on POD 17, the postoperative course was uneventful, and the patient was discharged in good general condition on POD 19 after stage-2. Besides the already demonstrated advantages in terms of reduced interstage morbidity, robotic ALPPS represents a promising strategy to expand surgical indication in patients with pCCA. The combination of liver partition and PVE may increase the opportunities to perform radical resections in selected patients with pCCA and portal vein infiltration
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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