1,721,085 research outputs found
Motion detection technology as a tool for cardiopulmonary resuscitation (CPR) quality improvement
Full text linkThe most popular method of training in basic life support and AED remains instructor-led training courses. Recent reviews provide good evidence to support alternative methods of training including lay instructors, self-directed learning (web, video, poster) and CPR feedback/prompt devices
Numerical investigation of the influence of tire deformation on different vehicle configurations
No full textWheels and wheel houses contribute up to 25% of the total aerodynamic drag of passenger cars. Both rim and tire geometries induce complex flow separation mechanisms in a highly unsteady regime. To have a clearer understanding of the flow around wheels and inside the wheel house, a detailed high-fidelity CFD setup with rotating wheels is essential. Tire deformation is modelled with an analytical approach, validated against FEA results. Realistic tire geometries are investigated with OpenFOAM with the purpose of assessing how deformation affects the aerodynamic performance of the wheels and the total drag of the car. To do so, different car heights and different tire deformation levels are investigated separately and then combined to assess the effect that each of them entails. The evaluations are done on the basis of the drag coefficient of the vehicle
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
Virtual reality enhanced mannequin (VREM) that is well received by resuscitation experts
No full textDispelling 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
A fully automated optimisation procedure for multi-airfoil configurations based on CFD
No full textDesigning and optimising multi-airfoil configurations usually require expensive tests in the wind tunnel and significant computational resources for CFD simulations. This work presents an accurate multi-airfoil optimisation procedure based on CFD with variable-fidelity algorithms coupled with multi-processing capabilities. The overall CFD setup has been developed by analysing several single and multi-element configurations. Geometries can be generated either by using airfoil parameterisations or by providing a list of points. Secondly, the grid generation relies on a fully automated procedure that handles multi-airfoil configurations, providing high quality grids with limited user inputs and consequently avoiding time-consuming manual tunings. About optimisation procedure, several design variables can be selected, such as relative positioning of the airfoils. The user can select different optimisation methods, including Particle Swarm Optimisation (PSO) and Steepest Ascent (or Descent) Optimisation. To determine a proper starting configuration or to cut off the number of configurations to be analysed and quickly converge to an optimal solution, various preliminary low-fidelity methodologies can be selected.
The entire methodology shows the feasibility of a CFD optimisation procedure for multi-element airfoils without the need for expensive wind tunnel tests and excessively time-consuming approaches
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