1,721,006 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Characterising the movement patterns of women's beach volleyball using global positioning systems
No full textThe aim of this thesis was to describe the movement patterns of women’s beach volleyball using global positioning systems (GPS) technology. This aim was completed in two parts: Part A involved the investigation of the level of agreement between an emerging GPS system (VX Sport VX235 Log, Visuallex Sport International Ltd, Lower Hutt, New Zealand) and a well- established GPS system (Catapult MinimaxX S4, Catapult Innovations, Melbourne Australia). We recruited five semi-professional beach volleyball athletes who wore the two GPS units (sampling at 10 Hz) simultaneously during a training session which involved beach volleyball drills and simulated match-play. A paired sample t-test with statistical significant set to p<0.05 was applied to examine whether differences existed in the measurements of total distance (m), average speed (m∙min-1), max velocity (m∙s-1) and the distance (m) covered in five distinct velocity zones during a beach volleyball training session between the two different brands of GPS units. Significantly greater average speed (38.3 ± 5.66 m∙min-1, p = 0.009), and the distance covered between speeds of 4-8 km∙h-1 (248 ± 207 m, p = 0.008) and 16-20.5 km∙h-1 (8.78 ± 7.40 m, p = 0.006) were reported by the Catapult S4 units compared to the VX235 GPS units (35.9 ± 3.45 m∙min-1, 206 ± 168 m and 1.64 ± 2.62 m respectively), in conjunction with the VX235 units reporting a greater max velocity (4.37 ± 0.68 m∙s-1, p = 0.013) compared to the Catapult S4 units (4.07 ± 0.60 m∙s-1). These results demonstrate that differences exists between the emerging VX235 GPS system and the well-established Catapult S4 GPS system for measuring the movement patterns during beach volleyball, supporting the notion that further validation of GPS units against other practically applied and validated athlete movement trackers is required to further understand the ability of GPS systems to measure the movement patterns of beach volleyball.
Part B of this thesis involved the application of the 10 Hz VX235 GPS unit to quantify the movement patterns of women’s beach volleyball match-play. Specifically the VX235 GPS unit was worn by twenty female beach volleyball athletes during competition matches from the U23 Australian beach volleyball championship (n=10) and the Queensland Open tournament (n=10). The results form Part B of this thesis describe women’s beach volleyball athletes as covering a total distance of 555 ± 129 m and an average speed of 36.2 ± 3.2 m∙min-1, in addition to the majority of the distance covered occurred at speeds between 0-3.9 km∙h-1 (274 ± 63.6 m) and 3.9-7.8 km∙h-1 (203 ± 57.3) during match-play. The magnitude of these physical measures resulted in an average heart rate of 159 ± 12.0 bpm and 71.3 ± 30.4% of time with a heart rate ≤168 bpm. An independent sample t-test with statistical significant set to p5 points). A paired sample t-test with statistical significant set to p 5). In addition all physiological measures of heart rate displayed no significant difference between sets that ended with a small score margin and sets that ended with a large score margin with the exception of the percentage of time spent with a heart rate between 80-85% of each athletes age-predicted max heart rate which was significantly greater for sets that ended with a small score margin (25.8 ± 16.3%, p = 0.013) compared to sets that ended with a large score margin (16.0 ± 17.1%). The results from Part B of this thesis were the first to identify the movement patterns of women’s beach volleyball and provide insight into the presence of fatigue and the effect of score margin differential. The results provide information to assist in preparing women’s beach volleyball athletes for the demands they are likely to undertake during competitive match-play.Thesis (Masters)Master of Medical Research (MMedRes)School of Medical ScienceGriffith HealthFull Tex
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
GPS Data Analytics in Football: A Spotlight on Deceleration
No full textBackground: As technology has improved, the ability to gain data from player monitoring devices has become more prevalent in sport science, especially with the introduction of Global Positioning System (GPS) technology. We know that the ability to rapidly increase velocity is a key element of field-based sports such as football, which require repeated sprint efforts throughout a game. What is less intuitive is the importance of negative acceleration or “deceleration” to team-sport performance. Deceleration is important because it affords players the ability to change direction and avoid collisions. Furthermore, deceleration may be a significant contributor to muscle fatigue and damage, which is an important consideration for performance and recovery. The two predominant metrics used to describe deceleration profiles are the frequency of deceleration efforts and the distance covered whilst decelerating; however, there are flaws with both metrics when considering the deceleration movement. Similarly, as deceleration is a secondary movement to a preceding acceleration, deceleration is opportunistic and cannot be analysed in isolation.
Methods: Activity profiles were collected from twenty male football players competing in the Australian Hyundai A-League during 58 matches throughout two seasons (N = 368 observations). Match data were organised into ten 9-minute periods (i.e., P1: 0 - 9 min) and the time spent accelerating at moderate (1 to 2 m·s−2) and high (> 2 m·s−2) acceleration (ACCM and ACCH, respectively) and the time spent decelerating at moderate (-1 to -2 m·s−2) and high (< -2 m·s−2) deceleration (DECM and DECH, respectively) were quantified. Additionally, deceleration:acceleration and deceleration:high-velocity running ratios were also quantified to interrogate the opportunistic nature of deceleration activity throughout match play. A linear mixed model was used to determine the effects of time on the duration spent accelerating and decelerating, as well as the effect of position and formation on the duration spent accelerating and decelerating.
Results: All four acceleration and deceleration metrics decreased between 23 – 26% from the first 9-min interval to the last 9-min interval. There was a significant effect of time on each metric and each displayed negative logarithmic curves within both halves of football match play. When examining the ratios of deceleration to acceleration and high-velocity running, there was no change in the ratio between DECH duration and total acceleration duration (ACCH + ACCM), while the ratios between DECM duration and total acceleration duration, DECM duration and high-velocity running distance (> 14.4 km·h1), and DECH duration and high-velocity running distance increased as the match progressed.
Discussion: Using negative logarithmic curves to illustrate the acceleration and deceleration decay provides a novel methodological approach to quantify the high-intensity actions during football match play. The decrease in the duration of deceleration efforts throughout match play could simply be attributed to a lack of opportunity, as evident by the increase in the ratio of deceleration:acceleration and deceleration:high-velocity running. This conflicts with the conclusions of previous studies which suggest that deceleration ability is compromised in the latter periods of match play.
Practical Applications: Researchers and practitioners should consider the frequency and intensity of deceleration before making inferences regarding a decrease in a player’s ability to decelerate. By utilising negative logarithmic curves, practitioners can model the decay in acceleration and decelerations profiles. Finally, researchers and practitioners must be aware of the opportunistic nature of deceleration and monitor changes in the ratios of deceleration:acceleration and deceleration:high-velocity running, rather than relying on deceleration values in isolation.Thesis (Masters)Master of Medical Research (MMedRes)School of Medical ScienceGriffith HealthFull Tex
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