1,720,956 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
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
Nuove strategie di defibrillazione cardiaca per il trattamento della morte improvvisa tachiaritmica: il defibrillatore impiantabile sottocutaneo
No full textLe malattie cardiovascolari rappresentano ancora oggi una delle principali cause di morte nel mondo occidentale e gran parte della mortalità è legata alla morte cardiaca improvvisa (MCI). L’unica terapia efficace della morte improvvisa tachiaritmica è la defibrillazione cardiaca precoce.
Da circa 30 anni la ricerca scientifica ha messo a punto dei sistemi di defibrillazione impiantabili (Implantable Cardioverter Defibrillator o ICD). I primi sistemi di impianto richiedevano una toracotomia, poi i progressi tecnologici hanno consentito di realizzare defibrillatori impiantabili per via transvenosa (Transvenous Implantable Cardioverter Defibrillator o TV-ICD), fino ad arrivare agli innovativi defibrillatori impiantabili sottocutanei (Subcutaneous Implantable Cardioverter Defibrillator o S-ICD).
Già diversi studi hanno evidenziato come questi nuovi dispositivi sottocutanei abbiano un’efficacia, nel riconoscimento e trattamento delle aritmie potenzialmente mortali, certamente non inferiore rispetto a quella dei defibrillatori tradizionali transvenosi.
In questo lavoro, oltre ad analizzare i principali benefici e limiti della terapia con S-ICD, vengono descritte le caratteristiche principali dei pazienti impiantati nel nostro centro di riferimento tra Aprile 2011 e Giugno 2014, specificando le indicazioni che hanno portato a scegliere un S-ICD piuttosto che un TV-ICD, gli eventi e le complicanze verificatesi durante il follow-up
Outcome of leadless pacemaker implantation in a referral centre for lead extraction: a comparison with transvenous pacemaker
No full textAims: The aim of the study was to compare the long-term clinical and electrical performance of Micra leadless pacemaker with ventricular single-chamber transvenous pacemaker (VVI TV-PM) in a high-volume centre for transvenous lead extraction (TLE).
Methods: Between May 2014 and April 2019, 100 patients (group 1) underwent Micra implant at our centre. We identified 100 patients (group 2) who underwent VVI TV-PM implant in the same period for a 1:1 comparison matched by age, sex, left ventricular systolic ejection fraction and previous TLE.
Results: The implant procedure was successful in all patients. In group 1, the procedure duration was lower than in group 2 (43.86 ± 22.38 vs 58.38 ± 17.85 min, p < 0.001), while the fluoroscopy time was longer (12.25 ± 6.84 vs 5.32 ± 4.42 min, p < 0.001). There was no difference about the rate of septal deployment at the right ventricle (group 1 vs group 2: 76% vs 86%, p = 0.10). Patients were followed-up for a median of 12 months. We didn’t observe any acute and chronic procedure-related complications in group 1, while we reported acute complications in seven patients, (7%, p = 0.02) and long-term complications in three patients (3%, p = 0.24), needing for a system revisions in 6 cases (6%, p = 0.038) in group 2. One systemic infection occurred during follow-up in a patient with VVI TV-PM. Electrical measurements were stable during follow-up in both groups, with a longer estimated battery life in group 1 (mean delivered energy at implant group 1 vs group 2: 0.14 ± 0.21 vs 0.26 ± 0.22 μJ, p < 0.001).
Conclusion: Micra pacemaker implant is a safe and effective procedure, with a lower rate of acute complications and system revisions and a longer estimated battery life compared to VVI TV-PM, even in a real life setting including patients who underwent TLE
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
- …
