1,720,986 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
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
Predicting and improving outcomes of transcatheter aortic valve replacement in older adults and the elderly
No full textIntroduction: Indications for transcatheter aortic valve replacement (TAVR) are progressively extending
to younger and lower risk patients. In this scenario, minimizing periprocedural complications and
optimizing procedural result are both crucial to achieve an excellent long-term outcome.
Areas covered: In this review, we summarize the main strategies that can be adopted before, during,
and after TAVR to predict and prevent complications, to optimize procedural results and ultimately
improve outcomes, with an emphasis on more recent evidence, new devices, and new techniques.
Expert opinion: In the next future TAVR will probably represent the first treatment option for patients
affected by aortic valve stenosis who are candidates to receive a biological valve. Continuous refinement
of TAVR devices has been key to allow safer and most effective procedures and further progress is
expected. Development of new techniques and devices, such as ultrasound-guided puncture and
intravascular lithotripsy, will expand safety and eligibility to transfemoral procedures. Effective preemptive
measures for coronary occlusion have been developed. Open issues include cerebral protection,
re-access to coronary arteries, post-procedural management, and therapy
Biolimus-a9 eluting stent implantion for unprotected left main coronary artery stenosis: 9-month strut coverage as assessed by optical coherence tomography
No full textOBJECTIVE: To evaluate strut coverage after biolimus-A9 eluting stent (BES) implantation for unprotected left main artery (ULMA) stenosis during follow-up and identify features associated with the length of uncovered stent segment, as assessed by frequency domain-optical coherence tomography (FD-OCT). BACKGROUND: Incomplete stent strut coverage is a risk factor for late stent thrombosis. Long-term interaction between vessel wall and BES in the context of ULMA stenting has not been investigated in depth. METHODS: We prospectively enrolled 32 patients with ULMA stenosis treated with BES. FD-OCT was performed at 9-month follow-up. Both malapposed and uncovered segment length were indexed for the segment between the distal and proximal cross-sections in which stent struts were circumferentially visible. Patients were divided into two groups according to the median value of maximal indexed uncovered segment length. Study endpoints were the rate of strut coverage and predictors of high uncovered segment length. RESULTS: We analyzed 3622 struts. The rate of covered struts was 87%. A high correlation was found between malapposed and uncovered segment length (r ≤ 0.82; P<.001). The median value of indexed-uncovered segment length was 0.308. On multivariable analysis, patients undergoing final kissing balloon were at lower risk of high uncovered segment length (odds ratio, 0.81; 95% confidence interval, 0.008-0.837; P≤.04). CONCLUSION: In patients undergoing BES implantation for treatment of ULMA stenosis, the rate of 9-month strut coverage is high. The use of final kissing balloon reduces the risk of high uncovered stent segment length
Transcatheter Aortic Valve Replacement for Pure Aortic Regurgitation in a Large and Noncalcified Annulus
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