1,720,975 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
[Leiomyosarcoma of the small intestine. A rare case of abdominal emergency].
No full textSmall bowel leiomyosarcomas are uncommon potentially curable tumors, unfortunately diagnosed at an advanced stage. The Authors report one case of leiomyosarcoma of the small bowel, with an eight-day history of severe abdominal pain, operated on, in emergency, for perforation with peritonitis. A review of English literature on this subject is reported
Analysis of a follow-up program for anal canal carcinoma
No full textThe ideal follow-up program for anal canal cancer remains unclear and controversial. We hereby describe an extensive follow-up program for anal canal carcinoma in order to evaluate which examinations and which diagnostic techniques really had impact on survival and management. We evaluated 25 patients with anal canal carcinoma. Local excision (LE) was performed in 5 patients, radiochemotherapy (RCT) in 13, radiochemotherapy and local excision (RCTE) in 7. Mean follow-up time was 6.3 years (range 20 months-ii years). The follow-up program included clinical examination, serum tumor markers evaluation, transrectal ultrasonography (TRUS), anoscopy with either mucosal or by Tru-cut needle multiple biopsies, standard chest X-ray and hepatic-inguinal ultrasonography, endoanal magnetic resonance imaging and in some cases total-body skeletal scintigraphy. A large multicentered randomized and prospective trial is surely lacking and should be undertaken as soon as possible. Our results suggest that an effective local control, rather than a higher survival is the reachable goal at present for anal canal carcinomas. However, further steps should be made to achieve better results. After this experience we propose a more semplified follow-up protocol which consists in performing only rectal examination, endoscopy, Tru-cut needle biopsies and TRUS for local control and inguinal ultrasound and TC to evidence distant metastases
Abdominal aortic aneurysms and concomitant neoplastic diseases. EVAR : a new option for surgical timing
No full textAim. Although the simultaneous occurrence of abdominal aortic aneurysm (AAA) and neoplastic disease is a rare event, the incidence of both increases with age and therefore the continuous growth of life expectancy has raised the prevalence of this association. The introduction of endovascular aneurysm repair (EVAR) in clinical practice has offered new treatment options. The authors report their experience with the introduction of E VAR. Methods. From January 2004 to June 2006, 176 patients affected by AAA were admitted - 29 had an emergent operation for rupture or fissuration, whereas 147 underwent elective surgery. Fifty of them were offered EVAR and a concomitant malignancy was present in 6 patients. In all 6 patients, EVAR was performed first. Results. We had no in-hospital mortality and no early complications. We had only one cancer-related death, 6 months after surgery. Conclusions. The introduction of EVAR has modified surgical timing in our clinical practice. When managing patients with AAA and concomitant malignancies EVAR allows treatment even in case of poor clinical conditions but still it is not the gold standard for AAA repair. Thus, it should be performed only after a thorough selection of patients who are not suitable for the combined intervention
Pre-operative assessment of extramural invasion and sphincteral involvement in rectal cancer by magnetic resonance imaging with phased-array coil
No full textObjective: Pre-operative staging of rectal cancer should identify patients with extrarectal spread, who might benefit from pre-operative radiotherapy, and patients with minimal sphincteral involvement, who can avoid permanent colostomy. The aim of this study was to assess the accuracy of Magnetic Resonance Imaging (MRI) to predict tumour stage and sphincter status. Patients and methods: Thirty-three patients with a rectal tumour were pre-operatively assessed by MRI with a phased-array coil. Imaging results were correlated with the final pathological findings. Results: The overall accuracy of pre-operative staging with MRI was 88% (k = 0.75) for extramural tumour invasion and 59% (k = 0.26) for lymph node metastases. MRI correctly evaluated the infiltration of the anal sphincters in 87% of patients (7 of 8 patients with low rectal tumour). Conclusion: MRI provides the surgeon with valuable information regarding extramural tumour spread and sphincteral involvement, enabling appropiate selection of patients for pre-operative adjuvant therapy or sphincter-saving surgery. © 2005 Blackwell Publishing Ltd
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