1,720,977 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
Lymphadenectomy versus no lymphadenectomy in endometrial carcinoma: a retrospective analysis of 410 patients.
No full textObjective: Pelvic lymph nodes are the most common site of extrauterine spread in
clinical early-stage endometrial cancer. International Federation of Gynecology and
Obstetrics has mandated surgical evaluation of lymph nodes in endometrial cancer
since 1988; however, the clinical impact of lymphadenectomy has never been addressed.
Design: We reported a retrospective analysis in order to evaluate whether
pelvic systematic lymph dissection improves overall and progression-free survival
compared with no lymphadenectomy. Method: From 1991 through 2008, patients
with endometrial carcinoma were evaluated using a log-rank statistic and a Cox
multivariable regression analysis. All statistical tests were two-sided. Results: Of the
410 patients with a diagnosis of endometrial carcinoma, 390 underwent primary
surgery. Of those who underwent surgery, 285 had endometrioid histology. One
hundred and ninety (190) patients had surgery with no lymphadenectomy, whereas
95 had surgery with lymphadenectomy. Only 4 women revealed positive nodes.
Median number of removed nodes was 14 in the lymphadenectomy group. The
5-year survival rate of 90% and 86% was achieved, respectively, for lymphadenectomy
and no lymphadenectomy ( p1⁄40.501). Conclusions: Although systematic
pelvic lymphadenectomy significantly improved surgical staging of women with
clinical early-stage endometrial carcinoma by detecting a higher rate of patients with
positive nodes, it did not improve overall survival
Is there a link between insulin resistance and inflammatory activation in preeclampsia?
No full text.Preeclampsia is a severe complication of human pregnancy and an insulin resistant state has been demonstrated in this multisystem disorder, although its bases remain unclear. Inositol phosphoglycans P-type belongs to a family of putative insulin mediators and was described to exert many insulin-like effects on lipid and glucose metabolism. A definite association between this molecule and preeclampsia was reported. The systemic inflammatory activation that occurs in preeclampsia as a consequence of the immunological dysfunction can exacerbate placental insulin resistance leading to an over-expression of P-IPG as a counterregulatory mechanism to insulin resistance. Besides, the lipidic form of P-IPG was reported to be similar to endotoxins, and may represent the link between insulin resistance, systemic inflammation and increased angiogenic factors. In this article we propose a new working theory on insulin resistance and preeclampsia. © 2009 Elsevier Ltd. All rights reserved
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
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