1,721,021 research outputs found
Beware of the difference between randomized controlled trials and daily clinical practice (in reply to “Surgery or antibiotics for acute appendicitis? Take care about study’s design and methodology!”, by Ceresoli M, et al.)
No full textNo abstract
Magnetic resonance urography
No full textMagnetic resonance (MR) urography has become an integral part of the recently emerging advances that involve clinical uroradiology. MR urography has received a relatively lower attention than multidetector CT (MDCT) urography, being hampered by the low spatial resolution which is crucial for calyceal evaluation and by the requirement of updated MR units. However, excellent contrast resolution and lack of ionizing radiation make MR urography a technique to be considered for noninvasively evaluating the entire urinary tract, especially when ionizing radiation is to be avoided, such as in pediatric or pregnant patients
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
Neuroendocrine carcinoma of the esophagogastric junction: a case report
No full textGastrointestinal neuroendocrine neoplasms are extremely rare. EsophagoGastric Junction (EGJ) is exceptionally struck by these neoplasms. The prognosis of these tumors is poor owing to their aggressive malignancy. A 77-year-old man was admitted with epigastric pain and dysphagia due to an ulcerative lesion of the EGJ, initially diagnosed by endoscopic biopsy as a moderately differentiated adenocarcinoma. Computed tomography scan revealed full thickness invasion of the EGJ and two abnormal lymph nodes along the lesser curvature of the stomach (cT2 N1 M0). An esophagectomy and partial gastrectomy with mediastinal and lesser curvature lymphadenectomy was performed. A cervical esophagogastric anastomosis completed the surgical procedure. The patient was discharge on the 11th postoperative day. Histology revealed a high grade neuroendocrine carcinoma combined with an adenocarcinoma of the EGJ (pT2 pN1 G3). The rarity of these tumors and the particularity of their heterogeneous cellular origin determine a diagnostic and therapeutic challenge not yet completely addressed
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
- …
