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Irwin G Kerwin DG 《Sports biomechanics / International Society of Biomechanics in Sports》2007,6(2):131-144
This study focused on identifying the most effective skill progression for developing the longswing on high bar in men's artistic gymnastics. Building on previous work by Irwin and Kerwin, in which a method to rank progressions based on their angular kinematics was developed, this study aimed to use the method to quantify similarities in inter-segmental coordination between selected progressions and the longswing on high bar. Video images of four members of the UK men's national gymnastics squad performing three series of five longswings and eight progressions were recorded at 50Hz. Two-dimensional direct linear transformation techniques were used to determine the real-world coordinates from the digitized data. Inter-segmental coordination of the hip and shoulder joints during the functional phases of the longswing was assessed using continuous relative phase. Similarity between the longswing and each progression was represented by a "specificity score", which was also used to rank the progressions. Each progression's specificity score was calculated by combining a "difference score" (root mean squared difference between the continuous relative phase profiles of the longswing and the progression) and a "variability score" (standard deviation of the continuous relative phase profiles for each progression). The progressions that were most similar to the longswing included the looped bar longswing and layaway swing down (ranked 1st and 2nd), with specificity scores of 9% and 10% respectively. In contrast, the least similar progressions were the looped bar "no action" longswing (51%) and pendulum swing (63%) (ranked 7th and 8th). Establishing effective skill learning pathways is recognized as a key component of the coaching process and ranking progressions based on their specificity score provided a mechanism to identify progressions with similar inter-segmental coordination profiles to the key skill on the high bar, the longswing. 相似文献
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蕴含东方和谐哲学思想的武术，把中国传统哲学的普遍和谐价值观念落实到行之有效的操作层面，不仅对于构建和谐社会有益，也是人类和谐相处的和平之桥。从神美、阴阳和谐美、静虚之美方面谈及武术的意境美及其美学价值。 相似文献
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Myat Noe Hsu Rongcong Luo Kerwin Zeming Kwek Yong Chen Por Yong Zhang Chia-Hung Chen 《Biomicrofluidics》2015,9(5)
The poor solubility of many newly discovered drugs has resulted in numerous challenges for the time-controlled release of therapeutics. In this study, an advanced drug delivery platform to encapsulate and deliver hydrophobic drugs, consisting of poly (lactic-co-glycolic acid) (PLGA) nanoparticles incorporated within poly (ethylene glycol) (PEG) microgels, was developed. PLGA nanoparticles were used as the hydrophobic drug carrier, while the PEG matrix functioned to slow down the drug release. Encapsulation of the hydrophobic agents was characterized by fluorescence detection of the hydrophobic dye Nile Red within the microgels. In addition, the microcomposites prepared via the droplet-based microfluidic technology showed size tunability and a monodisperse size distribution, along with improved release kinetics of the loaded cargo compared with bare PLGA nanoparticles. This composite system has potential as a universal delivery platform for a variety of hydrophobic molecules. 相似文献
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Williams G Irwin G Kerwin DG Newell KM 《Sports biomechanics / International Society of Biomechanics in Sports》2012,11(1):20-33
The purpose of this study is to provide evidence of technique changes during learning a sports-specific skill, the looped bar longswing (LLS). Thirteen male participants with no previous high bar experience took part in a training study. Kinematic data were collected using a CODA motion analysis system (200 Hz) during eight weekly testing sessions. Analyses focused on the amplitude of swing and the functional phase (FP) actions, defined by the rapid flexion to extension of the shoulders and extension to flexion of the hips as the performer passed through the lower vertical. Three groups were identified based on the number of sessions it took each participant to perform the LLS (G1: most successful, G2: intermediate, and G3: least successful). All participants were able to significantly increase swing amplitude over the training period (p < 0.05). For each participant the hip FP started significantly: later for G1, earlier for G2, and did not change for G3. Extension actions at the shoulders were dissimilar to those reported for elite gymnasts performing the longswing. The FP of the hips provides a mechanism to distinguish between the learners of different skill levels. The study has provided support for a single-subject design when investigating technique changes during learning. 相似文献
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Set against the backdrop of reinvigorating the study of literature and concerns about the adequate preparation of students for the world of work, this paper explores how a Singapore teacher presented a literary text in the classroom. Drawing on data from a large-scale representative sample of Singapore schools in instruction and assessment practices, we discuss some of the potential consequences of instructional choice-making from a disciplinary perspective. Our findings suggest, for example, that when teacher-dominated discourse and interpretations dominate, instructional flexibility and responsiveness are correspondingly limited and restricted. These courses of action, we contend, may occur contrary to teachers’ plans and expectations. The paper closes by making a call for further longitudinal research across multiple research sites into the nature of literature pedagogy that has a strong disciplinary focus. 相似文献
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改革《数学分析》教材中关于推导平面曲线弧长公式的传统方法和顺序,具体论述运用微元法先推导平面曲线弧长的直角坐标公式,再推导其参数公式,后推导其极坐标公式的创新方法及技巧。 相似文献
7.
George B. Cunningham Sheranne Fairley Lesley Ferkins Shannon Kerwin Daniel Lock Sally Shaw Pamela Wicker 《Sport Management Review》2018,21(1):1-6
The purpose of this article is to add to the conceptual discussion on eSport, analyze the role of eSport within sport management, and suggest avenues for future eSport research. The authors suggest that debates surround the degree to which eSport represents formal sport, and disagreements likely stem from conceptualizations of sport and context. Irrespective of one’s notion of eSport as formal sport, the authors suggest the topic has a place in sport management scholarship and discourse. Such a position is consistent with the broad view of sport adopted by Sport Management Review, the perspective that eSport represents a form of sportification, and the association among eSport and various outcomes, including physical and psychological health, social well-being, sport consumption outcomes, and diversity and inclusion. Finally, the authors conclude that eSport scholarship can advance through the study of its governance, marketing, and management as well as by theorizing about eSport. 相似文献
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主题作业及其在计算机课程教学中的应用 总被引：1，自引：0，他引：1
计算机教学长期采用的“知识型教学”。不利于培养学生的主动性、创造性以及学习兴趣。本文介绍了主题作业及其特点,分析了主题作业的构建方法与原则,提出将主题作业应用到的计算机课程的教学中来,可以提高计算机课程的教学效果。 相似文献
10.
Michael Barnes Robert G. Kelly Maureen Kerwin 《Library Collections, Acquisitions, and Technical Services》2010,34(2-3):57-65
Identifying and evaluating the oldest published content held by the library using a set of transfer criteria provided a means to systematically evaluate and, if necessary, move rare or unusual content into a more secure location. The process enabled us to correct cataloging errors, identify and address items with condition issues, be familiar with the library's unique holdings and finally, to identify and add content distinctly associated with EMU's history to the University Archives and Special Collections. 相似文献