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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
Hepatitis C virus infection and gastric lymphoproliferation in patients with Sjogren's syndrome
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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
Hepatitis C virus infection and gastric lymphoproliferation in patients with Sjogren syndrome
No full textCavernous transformation of the portal vein associated to multiorgan developmental abnormalities
No full textInitial diagnosis of cavernous transformation of the portal vein
(portal cavernoma) is rarely made in adults. Its main clinical manifestation is
upper gastrointestinal hemorrhage due to variceal bleeding. More rarely,
diagnosis is made from obstructive jaundice. In children, this condition is
frequently associated to prehepatic portal hypertension and congenital
anomalies, the most frequent of which are atrial septal defects or
malformations of the biliary tract or of the inferior vena cava.
We describe here a case of a 23-year-old female presenting with massive
hematemesis due to the presence of esophageal and small intestinal varices.
She had a cavernous transformation of the portal vein with prehepatic portal
hypertension associated with heretofore unreported malformations such as
right pulmonary hypoplasia, cardiac dextroposition, and right renal ectopia.
A unifying hypothesis (e.g. an intrauterine vascular insult) to explain the
pathogenesis of these defects seems unlikely. Appropriate tests failed to
identify specific functional abnormalities in these organs. Although she bled
more than once, the combination of sclerotherapy and b-blockers has been,
thus far, able to control the major clinical consequences of this diseas
Noise Reduction by Data Fusion in a Multisensor System of Replicated MEMS Inclinometers
No full textA Data Fusion (DF) approach for noise reduction in a system of multiple MEMS inclinometers is presented. The outputs of four inclinometers (ST IIS2CLX), that are nominally identical and set with the same operative conditions, have been acquired for 48 h consecutively. Each acquired dataset has been studied separately employing the Overlapping Allan VARiance (OAVAR) analysis to identify the Velocity Random Walk (VRW) and the Bias Instability (BI) noise contributions. The DF approach based on ensemble averaging across samples has been then applied combining the four acquired datasets, thus creating new datasets DFn, that contain averaged output data of n inclinometers at each acquisition time. The VRW and BI noise contributions of the DFn datasets have been identified through the OAVAR analysis and compared with the noise contributions of single inclinometers. Experimental results have shown a reduction of the noise variance sigma(2)(n) for both the BI and VRW with a factor 1/n or, equivalently, the noise deviation sigma(n) with a factor 1/root(n), in good agreement with theoretical expectations
Chronic gastritis and symptoms in patients with autoimmune diseases: Is H-pylori involved?
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