1,721,005 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
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
Role of autofluorescence bronchoscopy in evaluation of bronchial mucosa after lung transplantation
Full text linkAirway complications are a significant and persistent source of morbidity and mortality after lung transplantation; the incidence of these complications is around 15% with a mortality rate of 2- 3%. Airway complications arise, typically, the first two years post-transplant, and of these almost half are identified prior to discharge; their pathogenesis, as well as to opportunistic infections, appear to be related to the difficult revascularization of the bronchi resulting in chronic ischemia
Lo pneumotorace catameniale: nostra esperienza monocentrica e revisione della letteratura
No full textLo pneumotorace catameniale rappresenta una rara forma di pneumotorace spontaneo ricorrente che colpisce giovani donne in età fertile. La sua eziologia è associata alla presenza di endometriosi toracica ma la variabilità del decorso clinico, la difficoltà di riscontro istologico e la possibile assenza di lesioni diaframmatiche evidenti spesso impediscono una diagnosi di certezza. Quesito può rendere il successivo iter terapeutico soltanto empirico con alti tassi di recidive post-chirurgiche. Scopo di questo lavoro è descrivere l'indicazione chirurgica ed il successivo follow-up terapeutico eseguiti in caso di pneumotorace catameniale nella nostra esperienza monocentrica
Thoracoscopic versus conventional lobectomy : comparable short-term results associated to lower systemic impact
No full textVideotoracoscopy has emerged as an alternative to the conventional technique in thoracic surgery. We compared the outcomes after VTS and coventional lobectomies, in terms of postoperative pain, systemic inflammation and pulmonary function.From October 2010 and May 2011, 57 patients underwent pulmonary lobectomy. Among them, 15 patients received VTS lobectomy and 42 received open lobectomy. 15 patients were selected from the “open” group and used as controls.Operative times differed between the two groups (VTS 238.5 vs open 191.6 min, p 0.01), but we found no difference when we compared chest tube stay (POD 6.0 ± 2.83 vs 5.1 ± 2.94, NS). Perceived postoperative pain (NRS scale) was the same (POD1 3.1 vs 2.7, POD2 2.2 vs 2.2, POD3 1.5 vs 1.3, NS) and the total amount of analgesics per patient, expressed as mg of morphine/Kg, was also not statistically different (4 vs 4.8, NS). Furthermore, no statistical difference was observed in postoperative WBC and CRP between the two groups, although we believe this to be mainly due to the small population size. The average CRP was 7.6 vs. 11.6 on POD3 and 5.07 vs. 8.15 on POD5, in the VTS group and open group respectively. We didn’t have any major complications, but 4 patients who had undergone VTS lobectomy had a late pleural effusion requiring thoracentesis, despite the usual postoperative management. Moreover, a patient in the same group had postoperative pneumonia: we consider it to be related to an underlying HIV-related immunosuppression, rather than to the surgical technique itself. One patient in the “open” group experienced severe postoperative pain. One patient in each group had prolonged air-leaks and after that the “fissureless” technique was introduced when thoracoscopic lobectomies were performed.We believe VTS lobectomy to be a safe technique, associated to a lower systemic impact on the patient compared to the conventional technique
Vats Lobectomy combined with limited thoracotomy for treatment of superior sulcus tumors
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