1,720,955 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
Progression to cirrhosis and mortality of chronic hepatitis tipe B: a cohort study with 25 years follow-up
No full textla morbidità e mortalità, a lungo termine, "epato-correlata" nei pazienti Caucasici con epatite cronica B deve essere valutata, particolarmente alla luce del possibile uso della terapia antivirale. 105 pazienti caucasici, già pre-esistenti in una coorte già studiata, affetti da epatite cronica B, sono stati rivalutati. quello che emerge dallo studio è che in questa coorte di Pazienti, la progressione verso la cirrosi epatica è relativamente lenta. Quando questa è presente diventa un forte fattore predittivo di mortalità epato-correlata
Progression to cirrhosis and mortality of chronic hepatiita type B: a cohort study with 25 years follow-up in Italy.
No full textThe long-term liver-related morbidity and mortality of untreated Caucasian adult patients with chronic hepatitis (CH) B deserve further evaluation, particularly in the light of the possible use of antiviral agents. We conducted a longitudinal study to elucidate the long-term survival and prognostic factors in a cohort of Italian patients with hepatitis B surface antigen (HBsAg) positive CH. Methods: We re-evaluated, a cohort of 105 untreated patients (76% men; mean age 30±9 years; 64% hepatitis B e antigen (HBeAg) positive) with CHB without histological and clinical evidence of cirrhosis at presentation (1). We retrieved clinical, histological and ultrasound examinations, biochemical and virologic tests, and cause of death. Results: During a median period of 25.5 years 45 (43%) patients became inactive carriers, whereas the remaining 60 (57%) showed persistent alanine aminotransferase (ALT) elevation: 13 (12%) associated with HBeAg persistence, 32 (30.5%) with detectable serum HBV-DNA but HBeAg negative (HBeAg negative CH), 11 (10.5%) with concurrent hepatitis C virus and/or hepatitis delta virus infection and 4 (4%) with concurrent non alcoholic fatty liver disease. Twenty one (47%) inactive carriers cleared HBsAg. Cirrhosis developed in 32 (30.5%) patients (histologically documented in 30 and clinical in 2), 1 to 28 years after entry into the study with an incidence rate of 13.26 per 1000 person-years. Older age, male sex, absence of sustained remission and sustained HBV replication predicted cirrhosis occurrence independently. Liver-related death occurred in 7 (7%) patients, caused by HCC in 6 and liver failure in 1. None of the inactive carriers died of liver related causes. The 25-year survival probability was 87% in the 60 patients with active hepatitis and 80% in the subgroup of 45 patients with sustained HBV replication (HBeAg positive or HBeAg negative CH). Survival probability at 25 years was lower in patients who developed cirrhosis (79%) as compared to patients without cirrhosis (99%) (p = 0.0004). Cox proportional regression model showed that cirrhosis occurrence during follow-up was significantly associated with an increased risk of liver related death. The adjusted hazard ratios (95% Confidence Interval) for liver related death was 12.86 (1.48-111.7) for patients who developed cirrhosis relative to those without cirrhosis. Conclusions: In Caucasian patients with CH without cirrhosis at presentation progression to cirrhosis is relatively slow, but cirrhosis occurrence strongly predict disease-related mortality
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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