1,721,007 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Presence of biopsy-proven histologic damage (necroinflammation and fibrosis) is common even when ALT is less than 2x ULN in patients with chronic hepatitis B (CHB)
No full textVariations on the Author
Get PDF“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
Get PDFWe 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
Peginterferon-alpha(2a) (40 kDa) for chronic hepatitis C
No full textPegylated IFN-alpha(2a) (PEG-IFN-alpha(2a) [40 kDa]; Pegasys(R), Hoffmann-La Roche) is a new subcutaneous formulation of IFN-alpha(2a), produced by its attachment to a 40 kDa branched polyethylene glycol moiety by a stable amide bond. PEG-IFN-alpha(2a)180 mug once-weekly has enhanced pharmacokinetic and pharmacodynamic properties which translate into significantly improved efficacy and similar safety and tolerability compared with IFN-alpha in patients with chronic hepatitis C even with underlying cirrhosis. The combination of PEG-IFN-alpha(2a) (40 kDa) plus ribavirin produces significantly better sustained virological responses than the combination of IFN-alpha(2b) and ribavirin, while it is accompanied by a similar or even lower incidence of adverse events and better quality of life. PEG-IFN-alpha(2a) (40 kDa) is the first pegylated IFN-alpha for which evidence-based recommendations can be made on optimum therapy duration and ribavirin dose according to HCV genotype. PEG-IFN-alpha(2a) (40 kDa) is expected to improve the efficacy and tolerability of treatment for chronic hepatitis C
Prevalence and impact of upper and lower gastrointestinal symptoms in the greek urban general population
No full textObjectives. To study the prevalence of gastrointestinal symptoms in the Greek urban general population, their associations with patient characteristics, and their effect on patients’ daily activities. Material and methods. The study included 700 adults from the Athens-Piraeus area selected by a 2-stage scheme based on the official maps of the Hellenic Statistic Service. Structured questionnaires were completed through personal interviews. Dyspepsia, gastroesophageal reflux disease (GERD), and irritable bowel syndrome (IBS) were diagnosed according to widely accepted definitions. Results. Of the 700 individuals, 53% reported >= 1 gastrointestinal symptom during the past week and 55% during the past 6 months (dyspepsia: 48%, GERD: 38%, IBS: 21%). Only one disorder was diagnosed in 25% (dyspepsia: 18%, GERD: 7%), and >= 2 disorders in 75% of symptomatic individuals. Dyspepsia or GERD was predominant in 7% and 16% and IBS in 28% and 19% of the patients with relevant symptoms during the past week and the past 6 months, respectively (p=0.017). Substantial symptoms during the past 6 months were reported by 60% of the symptomatic individuals. Affected daily activities were reported by 22% of symptomatic and 5% of asymptomatic individuals (p <0.001). Conclusions. Gastrointestinal symptoms are highly prevalent in the Greek urban general population and are substantial in the majority of symptomatic individuals. Dyspepsia and GERD are reported much more frequently than IBS symptoms, but there is a significant overlap between symptomatic diagnoses, while the predominant diagnosis may change over time. Gastrointestinal symptoms have a significant impact on patients’ daily activities
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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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