1,720,973 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
Beta-blockers and arterial hypertension
No full textFor more than 30 years, beta-blockers have widely been used in the treatment of patients with myocardial infarction, angina pectoris, heart failure, certain cardiac arrhythmias and hypertension. Quite recently, however, beta-blockers have been put under trial by results of some controlled studies and meta-analyses conducted in patients with essential hypertension. In summary, beta-blockers proved not better, or even worse, than alternative treatments and only marginally better than placebo. However, some arguments of caveat must be remarked. First, most of these studies have been conducted in hypertensive subjects of old age or complicated by several concomitant risk factors. A considerable portion of hypertensive patients most frequently examined in the usual practice would have not meet inclusion criteria for the above trials. In addition, several methodological issues of meta-analyses raised concern. Results were mainly driven from two major trials (LIFE and ASCOT). Unexpectedly, recent hypertension guidelines issued by the British Hypertension Society fully endorsed these results and recommended beta-blockers as fourth-line drugs in hypertensive patients with blood pressure not adequately controlled by angiotensin-converting enzyme inhibitors, calcium channel blockers and diuretics in combination. Because most of the above trials used atenolol, several lines of evidence warn against extending limitations to beta-blockers to the entire class of these drugs. Some new-generation beta-blockers, although not yet widely tested in outcome-based studies, induce peripheral vasodilatation and do not exert the detrimental effect of atenolol on central blood pressure and arterial distensibility. The present review addresses facts and theories related to the actual concern on the role of beta-blockers in the modern management of hypertensive patients. © 2007 AIM Publishing Srl
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
Validation of the A&D wrist-cuff UB-511 (UB-512) device for self-measurement of blood pressure
No full textST-Segment resolution after fibrinolysis or primary coronary angioplasty in the first three hours in acute myocardial infarction
No full text
Procynostic value of circadian blood pressure changes in relation to differing measures of day and night
No full text- …
