1,721,018 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
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
Persistent thrombin generation during heparin therapy in patients with acute coronary syndromes
No full textAppropriate 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
Factor IX activation peptide and soluble selectins in patients with chronic myeloproliferative disorders
No full textIF 3.45
ACTIVATION OF THE HEMOSTATIC MECHANISM DURING THROMBOLYSIS IN PATIENTS WITH UNSTABLE ANGINA-PECTORIS
No full textPERSISTENT ACTIVATION OF COAGULATION MECHANISM IN UNSTABLE ANGINA AND MYOCARDIAL-INFARCTION
No full textBackground The blood coagulation system is activated in the acute phase of unstable angina and acute myocardial infarction. However, it remains unclear whether augmented function of the hemostatic mechanism serves only as a marker of the acute thrombotic episode or whether a hypercoagulable state persists for a prolonged period after clinical stabilization.
Methods and Results We prospectively measured the plasma concentrations of prothrombin fragment 1+2 (F-1+2) and fibrinopeptide A (FPA) in consecutive patients presenting with unstable angina (n=80) or acute myocardial infarction (n=32), respectively. At 6 months, plasma determinations were repeated in patients experiencing an uneventful clinical course (unstable angina, n=57; myocardial infarction, n=23). We quantitated the plasma levels of F-1+2 and FPA in control patients with stable angina (n=37) or healthy individuals (n=32) who were matched for age and sex. The median plasma concentrations of F-1+2 and FPA are significantly higher in patients presenting with unstable angina (F-1+2, 1.08 nmol/L; FPA, 2.4 nmol/L) or acute myocardial infarction (F-1+2, 1.27 nmol/L; FPA, 3.55 nmol/L) compared with patients with stable angina (F-1+2, 0.74 nmol/L; FPA, 1.3 nmol/L; P<.0001) or healthy individuals (F-1+2, 0.71 nmol/L; FPA, 0.80 nmol/L; P<.0001). At 6 months, the median plasma levels of F-1+2 in patients exhibiting an uneventful clinical course did not differ from values obtained at admission (unstable angina, 1.26 versus 1.07 nmol/L, P=NS; myocardial infarction, 1.22 versus 1.29 nmol/L, P=NS), whereas the median plasma levels of FPA in the same two subpopulations were significantly reduced (unstable angina, 1.1 versus 2.9 nmol/L, P=.0003; myocardial infarction, 1.1 versus 3.0 nmol/L; P=.0028).
Conclusions During the acute phase of unstable angina and myocardial infarction, patients exhibit increased coagulation system activity. Over the next 6 months, patients with unstable angina or myocardial infarction experiencing an uneventful clinical course manifest a persistent hypercoagulable state with minimal generation of fibrin
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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