1,721,004 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
Evaluating squat and countermovement jumps based on a wearable accelerometer: preliminary results
No full textAim: The aim of this study was to propose an easy and affordable tool for the evaluation of Squat and Countermovement jumps, which could be effectively used in sports practice for the assessment of lower limb performance based on the Bosco test approach. The goal was thus to reliably measure jump flight time based the accelerometer signals and thus compute jump height and work performed. Method: We developed a wearable tri-axial accelerometer based on a MEMS sensor and ZigBee wireless communication with a companion software for PC. The device was worn using a strap-on belt positioning the device roughly at the level of L4. In order to verify our estimates of jump’s flight time, we chose to simultaneously record data from our device and from a Quattro Jump force platform (Kistler) on a set of 15 volunteer subjects each performing one set of five Squat (SJ) and one of five Countermovement jumps (CMJ). The force platform signal was thus used as reference measurement to be compared with those derived from our wearable accelerometer. The acquired data was processed using custom developed Matlab functions. Flight time was computed from the force platform data f(t) as the time interval during which the platform was unloaded and its output was therefore near 0, i.e. f(t)\0.1. Based on the scientific literature we considered three different approaches to accelerometer data processing for estimating flight time: (1) takeoff and landing as the last and first samples, respectively, above a low level threshold indicating freefall (AL), (2) takeoff as the last peak preceding the low level interval and landing as above (APL) and (3) takeoff as the last peak preceding and landing as the first peak following the low level interval (AP). Results: The acquired accelerometer data was generally noisy and required preliminary smoothing. We found that the platform-based estimate of flight time was very precise with a standard deviation of the measurements within subjects ranging 4.1–41.6 ms (mean 12.8 ms) in SJ and 4.6–15.1 ms (mean 9.1 ms) during CMJ. The precision decreased using the accelerometer signals as standard deviations raised to 4.2–83.1 ms (mean 26.4 ms) and 1.6–108.0 ms (mean 31.7 ms) for AL, to 7.1–89.6 ms (mean 54.0 ms) and 6.2–116.4 ms (mean 38.5 ms) for APL, to 5.2–102.2 ms (mean 51.1 ms) and 7.0–113.2 ms (mean 38.8 ms) for AP, in SJ and CMJ, respectively. Conclusion: The accelerometer data was relatively noisy most likely due to the oscillations undergone by the sensor during the abrupt movements typical of vertical jumping. Further effort will therefore be devoted to assuring a tight fit of the worn sensor on the body of the athletes. Although generally underestimating flight times, the most reliable approach was the AL algorithm, though its behavior also relies on signal quality. In conclusion, our results are promising that a reliable evaluation of vertical jumps may be successfully performed based on a lightweight MEMS accelerometer worn at the level of lumbar vertebrae, yet further research is needed to grant better signal quality and reliability of the algorithm
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
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