1,720,965 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
Acute lithiasic cholecystitis in Rett syndrome: Discussion on a complication
No full textBACKGROUND: The laparoscopic cholecystectomy becoming the gold standard in the treatment of lithiasic cholecystitis. At present, the complications range between 0.25% and 0.74% for the major lesions and between 0.28% and 1.7% for the minor lesions. In this study, we describe a clinical picture of biliary peritonitis in a RTT patient after laparoscopic cholecystectomy. The cause of lesion is not always easily identifiable and the multiple factors promoting a lesion can be involved, such as those ones related to anatomy of hepatic pedicle, abnormalities of cystic duct, inflammatory alterations and finally factors related to the expertise of surgical teams. In addition, the factors related to patients, such as obesity, cirrhosis, precedent surgeries and anatomical abnormalities, should always be considered. METHODS: Among the 250 patients operated on for acute lithiasic cholecystitis from January 2009 to February 2014 at the "Istituto di Chirugia II" of the Siena University Hospital, we have observed 12 cases (circa 5% of the population) of RTT patients (mean age: 29.0±years, range 22-36, all female). RESULTS: After twenty days the patients were released, of note, one RTT patient showed a clinical picture of biliary peritonitis.The presence of subhepatic fluid collection and extravasated contrast medium near the cystic duct stump and the common hepatic duct. The abdominal computerized tomography (CT) with contrast agent confirmed the biliary peritonitis. On an emergency laparotomy, bile duct injuries at the level of the right hepatic duct and cystic duct have been revealed. CONCLUSIONS: Our experience suggests that these risks are increased in RTT patients and therefore necessitate a more accurate pre-and postoperative assessment, both in terms clinical-Anaesthesiological and instrumental, in order to make early diagnosis and thereby prevent possible complications
Treatment of median incisional hernia. Laparoscopic vs. open surgery: meta-analysis
No full textIn the last ten years we assisted to spreading of laparoscopic approach on the correction of median incisional hernia, although for increased interesting toward mini-invasive techniques than for matching results between lap and open approaches. The aim of our study is the critical analysis of the results of lap and open surgery in the approach of ventral hernia, through the meta-analytical revision of the principal checked prospective trials. There were emerged 7 perspective studies to fit to a meta-analysis with the revision of the literature, with 1165 patients in total. Among the perioperative outcomes the briefer surgical time and a reduction of postoperative hospitalization were observed with the significant statistic data in favor of the lap. Laparoscopy can be considered a valid technical alternative to traditional open surgery in the treatment of ventral incisional hernia. The advantages of mini-invasive approach are the reducing of the surgical time and of the total hospital stay. There were not emerged any significant differences regarding the other surgical end-points or the recurrences of hernias after 1 and 5 years
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
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