1,720,987 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
ADEQUACY OF CAPD - A COMPARISON WITH OTHER DIALYSIS MODALITIES
No full text93 dialysis patients were included in a prospective trial on treatment adequacy (45 CAPD; 10 nightly automatic peritoneal dialysis, NAPD; 8 intermittent peritoneal dialysis, IPD; 15 standard bicarbonate haemodialysis; 15 high-efficiency-haemodialysis). Urea and creatinine kinetics were analyzed as well as dietary protein intake. In CAPD, a weekly Kt/V of 1.77 was calculated including peritoneal and residual renal clearance (K(pr)t/V). Patients with residual renal function (58% of the study population) had an average residual renal clearance of 3.42 ml/min, presenting lower concentrations of urea nitrogen and creatinine in the plasma. As a consequence, lower percent excretion of urea and creatinine in the peritoneal fluid was observed in comparison to patients without residual renal function. In NAPD the weekly K(pr)t/V was 1.92 and urea nitrogen removal slightly higher than in CAPD patients. In IPD weekly K(pr)t/V was 1.23 and urea nitrogen removal definitely lower than with any other technique. In the haemodialysis groups, despite the higher clearance and a weekly Kt/V higher than 3, the urea nitrogen removal per week was comparable to that obtained in CAPD and NAPD. The concentration profiles in blood appear to be the critical factor in achieving the final target of the treatment, i.e. the excretion of the amount of waste products derived from protein breakdown and other metabolic pathways. Due to constant blood levels in CAPD such a low Kt/V can be adequate while in HD higher efficiency is required. In intermittent treatments in fact, the sudden decrease of the blood levels during the session leads to a minor removal of solutes even in the presence of higher clearances. As a consequence the predialysis levels in the next session will be higher and will permit a higher removal from the beginning, until a steady balance between intake and removal is obtained
ADEQUACY OF CONTINUOUS AMBULATORY PERITONEAL-DIALYSIS - COMPARISON WITH OTHER DIALYSIS TECHNIQUES
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
CONTINUOUS ARTERIOVENOUS HEMOFILTRATION IN THE CRITICALLY ILL PATIENT - CLINICAL USE AND OPERATIONAL CHARACTERISTICS
No full textDispelling 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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