1,720,979 research outputs found
Hypertrophy of the ligamenta flava of the cervical spine. Clinico-radiological correlations.
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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
Variations 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
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
TFPI antigen and activity levels in patients with asymptomatic atherosclerosis and target organ acute and chronic complications
No full textAIM:
In patients with atherosclerosis there is an activation of the tissue factor mediated coagulation cascade. The aim of our study was to ascertain if there is a relationship between increased tissue factor pathway inhibitor (TFPI) antigen and activity plasma levels and atherosclerosis.
METHODS:
Design: case-control study. Setting: Department of Internal Medicine and Cardiovascular Diseases, University of Palermo and Laboratory of Genetics and Molecular Biology, Mayo Clinic, Rochester, MN, USA. Patients: 63 consecutive patients with asymptomatic atherosclerosis or with its acute or chronic complications, and 20 healthy volunteers. Measurements: TFPI antigen was detected by an immunoenzimatic assay (Imunobind total TFPI ELISA kit, American Diagnostica Inc., USA). TFPI activity was evaluated by an activity assay (Actichrome TFPI activity assay, American Diagnostica Inc., USA).
RESULTS:
Patients with chronic (P=0.0001 for TFPI Ag, P=0.006 for TFPI Ac) and acute (P=0.04 for TFPI Ag, P=0.01 for TFPI Ac) vascular disease and with asymptomatic carotid plaque (P=0.0019 for TFPI Ag, P<0.05 for TFPI Ac) had significantly increased TFPI antigen and activity plasma levels vs healthy volunteers. Moreover, patients with chronic vascular disease had higher TFPI Ag levels vs patients with asymptomatic atherosclerosis (P=0.0013).
CONCLUSIONS:
The originality of our study was the finding of increased TFPI levels, not only in patients with acute complication of atherosclerosis, but also in those with chronic vascular disease and with asymptomatic carotid plaque
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