1,721,329 research outputs found
Assessment of a hybrid numerical approach to estimate sound wave propagation in an enclosure and application of auralizations to evaluate acoustical conditions of a classroom to establish the impact of acoustic variables on cognitive processes
No full textIn this research, the concept of auralization is explored taking into account a hybrid numerical approach to establish good options for calculating sound wave propagation and the application of virtual sound environments to evaluate acoustical conditions of a classroom, in order to determine the impact of acoustic variables on cognitive processes. The hybrid approach considers the combination of well-established Geometrical Acoustic (GA) techniques and the Finite Element Method (FEM), contemplating for the latter the definition of a real valued impedance boundary condition related to absorption coefficients available in GA databases. The realised virtual sound environments are verified against real environment measurements by means of objective and subjective methods. The former is based on acoustic measurements according to international standards, in order to evaluate the numerical approaches used with established acoustic indicators to assess sound propagation in rooms. The latter comprises a subjective test comparing the virtual auralizations to the reference ones, which are obtained by means of binaural impulse response measurements. The first application of the auralizations contemplates an intelligibility and listening difficulty subjective test, considering different acoustic conditions of reverberation time and background noise levels. The second application studies the impact of acoustic variables on the cognitive processes of attention, memory and executive function, by means of psychological tests
Creation of virtual sound environments using geometrical acoustics and finite elements method
No full textIn this paper, the sound pressure field of a small room was analysed using geometrical acoustics methods, a wave equation method in the frequency domain and binaural impulse response measurements in order to create virtual sound environments for specific source-receiver positions. The GA methods were applied using CATT-Acoustic, where the Randomised Tail-corrected Cone-tracing was implemented in order to generate binaural impulse responses. The wave equation technique was applied using ACTRAN, which utilizes FEM to estimate the sound pressure field. Afterward, a hybrid method combining GA and FEM was implemented via Off-line signal processing to create binaural impulse responses using the frequency ranges where each technique provides more reliable results. Finally, the realised virtual sound environments were verified against the binaural impulse response measurements by means of objective and subjective methods
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
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