1,721,028 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
Information security concepts and practices: the case of a provincial multi-specialty hospital
No full textThe impact of biopsy number and site on the accuracy of intestinal metaplasia detection in the stomach A morphometric study based on virtual biopsies.
No full textBackground. Intestinal metaplasia is a risk factor for gastric carcinoma. So far few studies have focused on the efficacy of endoscopic biopsies in detecting intestinal metaplasia in relation with the site and number of biopsies performed. The present study is aimed to assess the efficacy of single and multiple gastric biopsies in the detection and staging of intestinal metaplasia.
Material and methods. The studywas conducted on 455 gastrectomies.We defined the extent of intestinal metaplasia on surgical specimens sampled by the “Swiss roll” technique and assessed the efficiency of an increasing number of “virtual” biopsies performed on the same rolls in recognising the true extent of intestinal metaplasia in the antro-angular region.
Results. Seventy-four out of 455 cases showed intestinal metaplasia in more than 5% of the antro-angular mucosa. The correlation between antro-angular intestinal metaplasia on rolls and on virtual biopsies was always highly significant, both when a single biopsy was considered and when groups of multiple biopsies (from 2 to 6 samples) were taken into account (p≤0.0001 and rho ranging from 0.304 to 0.817). By increasing the number of biopsies (from 1 to 6) we observed an increase in the rate of correct estimations when 20% extent was used as a cut-off: the increase was statistically significant in both intestinal metaplasia ≥20% and intestinal metaplasia <20% groups (p < 0.0001). The
highest value of concordance between intestinal metaplasia extent in virtual biopsies and in rolls was recorded for a set of 4 antral + 1 angular biopsies whereas a set of 2 antral + 1 angular biopsies turned out to be the most effective in terms of number/efficacy.
Conclusions. A three biopsy set (2 antral + 1 angular) allows correct detection of intestinal metaplasia extent in 90% of cases
Endogenous substances with immunological and biological activity similar to cardiac glycosides: biochemical and pathophysiological implications
No full textAppropriate 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
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