1,721,288 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
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
Δεξιά Διεστιακή Κοιλιακή Βηματοδότηση: Ίσως μια Εναλλακτική Λύση για τις Ανέφικτες ή Δύσκολες Περιπτώσεις Αμφικοιλιακής Βηματοδότησης?
No full textΣύμφωνα με τη μελέτη BRIGHT σε 42 ασθενείς με τυπικές ενδείξεις για αμφικοιλιακή βηματοδότηση, έγινε τυχαιοποίηση μετά τον πρώτο μήνα σε διεστιακή δεξιά κοιλιακή βηματοδότηση ή control mode (VVI @ 40 ppm). Η διεστιακή βηματοδότηση περιέλαβε την κορυφή και υψηλή διαφραγματική θέση της δεξιάς κοιλίας. Η μελέτη ήταν διασταυρούμενη 6μηνης διάρκειας και η διασταύρωση έλαβε χώρα στο 3μηνο. Οι παράμετροι μετρήθηκαν πριν την τυχαιοποίηση και μετά 3 μήνες διεστιακής ή control mode βηματοδότησης. Οκτώ ασθενείς δεν είχαν 7μηνη παρακολούθηση, 3 απεβίωσαν (1 πριν την τυχαιοποίηση), & 8 εξήλθαν της μελέτης. Σε 1 ασθενή αντικαταστάθηκε το ηλεκτρόδιο με αριστερό κοιλιακό ηλεκτρόδιο και 1 ασθενής εμφάνισε κολπική μαρμαρυγή. Σε σύγκριση με τις βασικές μετρήσεις, η διεστιακή βηματοδότηση βελτίωσε το κλάσμα εξώθησης από 26+12% σε 36+11% (p<0.0008), & η κατηγορία κατά ΝΥΗΑ μειώθηκε από 2.8+0.4 σε 2.3+0.7 (P < 0.007). Επιπλέον, η 6λεπτη βάδιση βελτιώθηκε από 372+129 m σε 453+122 m (P < 0.05), και η ποιότητα ζωής βελτιώθηκε σημαντικά (P < 0.006). Στην ομάδα ελέγχου δεν παρατηρήθηκαν σημαντικές μεταβολές. Οκτώ ασθενείς δεν ανέχθηκαν τον επαναπρογραμματισμό από τη διεστιακή βηματοδότηση σε control βηματοδότηση, και τα συμπτώματα απέδραμαν σε όλους μετά τον επαναπρογραμματισμό στη διεστιακή βηματοδότηση... (excerpt
Discrepant Atrial Fibrillation Guidelines
Get PDFRecently, cardiological societies in Europe (ESC), US and Canada (CCS) have updated their guidelines for atrial fibrillation (AF). However, there are several discrepancies which have been identified and discussed. Among them, the following are the most blatant ones. • Anticoagulation. Atrial fibrillation confers a 5-fold increase in the risk of stroke if left without anticoagulation therapy and a 2-fold increase in the risk of death from such thromboembolic strokes. The US guidelines recommend anticoagulation for a patient with a CHADS2 score of ≥2, and either aspirin or anticoagulation for a patient with a CHADS2 score of 1, while the CCS and ESC guidelines recommend anticoagulation for a patient with ≥1 risk factor(s). The new anticoagulants are taken into consideration by the CCS guidelines, recommending dabigatran instead of vitamin K antagonists (VKA). The ESC guidelines make recommendations for future use of dabigatran (when approved in the EU) depending on the risk of bleeding; for low-risk patients it may be considered, while for higher risk patients the lower dose of 110 mg of dabigatran may be considered. Also patients with a CHADS2 score of 1 may receive the lower dose (110 mg) of dabigatran. The US guidelines issued an update for dabigatran, indicating that it is a useful alternative to VKA... (excerpt
CABANA Trial: The Aftermath after the Negative / Neutral Results
Get PDFThe results of the CABANA trial were recently presented at the Heart Rhythm Society Meeting in May 2018, indicating that ablation in patients with atrial fibrillation (AF) did not confer a benefit over drug treatment in the intention-to treat analysis, but did so in an on-treatment analysis. The presentation stirred commotion in the medical community with fierce controversy appearing in the media, mostly related to an apparent willingness of electrophysiologists to dispel the first and accept the second type of analysis. Rhythmos 2018;13(3): 45-47
Atrial Fibrillation and Cognitive Impairment
Get PDFGrowing evidence suggests that atrial fibrillation (AF), in addition to known thromboembolic risk, is a risk factor for significant cognitive impairment via several pathways, further contributing to morbidity and mortality. Whether anticoagulation, rhythm control strategies and other interventions aiming at preventing thromboembolic events and ameliorating the clinical outcome of AF patients, may also have a beneficial effect on long-term cognitive function remains to be seen in future studies
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