The kinematic differences between skill levels in the squash forehand drive,volley and drop strokes

ABSTRACT

Knowledge of the kinematic differences that separate highly skilled and less-skilled squash players could assist the progression of talent development. This study compared trunk, upper-limb and racket kinematics between two groups of nine highly skilled and less-skilled male athletes for forehand drive, volley and drop strokes. A 15-camera motion analysis system recorded three-dimensional trajectories, with five shots analysed per participant per stroke. The highly skilled group had significantly (p < 0.05) larger forearm pronation/supination range-of-motion and wrist extension angles at impact than the less-skilled. The less-skilled group had a significantly more “open” racket face and slower racket velocities at impact than the highly skilled. Rates of shoulder internal rotation, forearm pronation, elbow extension and wrist flexion at impact were greater in the drive stroke than in the other strokes. The position of the racket at impact in the volley was significantly more anterior to the shoulder than in the other strokes, with a smaller trunk rotation angular velocity. Players used less shoulder internal/external rotation, forearm pronation/supination, elbow and wrist flexion/extension ranges-of-motions and angular velocities at impact in the drop stroke than in the other strokes. These findings provide useful insights into the technical differences that separate highly skilled from less-skilled players and provide a kinematic distinction between stroke types.     

EXAMINATION OF EARLY CHILDHOOD PRACTITIONERS’ GENERAL PERCEPTION OF GENDER DIFFERENCES IN YOUNG CHILDREN

This study attempts to explore and discuss preschool teachers’ perception of gender differences in young children through their verbal expression. The teachers (Study I, n —121, Study II, n= 31) in this study perceive female preschoolers as positive and sensitive learners. While many learner qualities such as inventive, problem‐solver, builder, hands‐on, questioning, etc. are identified more often for boys than girls, overall the teachers’ perception of the boys’ group is less “teachable” and “easy to work with” than the girls group. In addition, one of the most intriguing and concerning observations is that girls are perceived as “passive learners” and therefore they are more “teachable” than boys. As implications of the study, the paper discusses an important understanding of gender‐fair and gender‐congruent pedagogical awareness for developmentally and culturally appropriate practice in early childhood education.

This study was originally presented at the 1999 AERA Annual Meeting, April 19‐23, Montreal, Canada, and was titled Examination of Preschool Teachers’ Biased Perception on Gender Difference.     

Playing at School: An Inquiry Approach to Using an Experiential Play Lab in an Early Childhood Teacher Education Course

Play is considered an important activity of the early childhood years. Research supports the contribution of play to children’s development, learning, and well-being. In spite of this, time for play is being pushed out in many early childhood programs by greater time allotted to formal instruction in narrow academic skills to be tested eventually by standardized tests. As a result, current preservice teachers are likely to see fewer examples of appropriate time and support for play in their field placements in early childhood settings. The purpose of this study was to document and analyze what happens when an experiential play lab is implemented in an early childhood teacher education program. This qualitative study includes multiple forms of data collection, including two forms of reflective writings and group discussions. After the workshop, preservice teachers made a greater number of references to play in their defense of developmentally appropriate practice, and the nature of their references to play increased in their focus on play process and on teacher roles in children’s play, as compared to prior to the lab. The results of this study of an experiential play intervention support its potential as a means of probing, documenting, and enriching students’ understanding of the importance of providing for and supporting play in classrooms for young children.     

Mass media and cultural identity: Issues of ethnic co‐existence in India

This study aimed to analyze the respective effects of cognitive and emotional elements on political judgments, and the effects of media use and political talk on those two elements. Along with the cognitive judgment about political and economic issues/policies, we explored the effect of emotional responses to political and economic situations. During this process, we also looked at the effect of media use and interpersonal communication channels. By analyzing survey data gathered in December 2007, it was first found that voters' cognitive judgment and emotional responses to political and economic situations, respectively, affected their evaluation of the incumbent president. Second, emotional reactions such as ‘pride’ in politics, and ‘hope’ and ‘anger’ for economics, showed significant influence on their evaluation of the president's performance. Third, voters' patterns of media use and interpersonal talk appeared to exert significant influences on those cognitive judgments and emotional responses to political and economic reality.     

Global risk,domestic framing: coverage of the North Korean nuclear test by US,Chinese, and South Korean news agencies

Comparative framing analysis on coverage of the North Korean nuclear test in the US Associated Press, Chinese Xinhua, and South Korean Yonhap news agencies identified four major media packages. First, a common ‘threat’ frame dominated coverage by all news agencies, represented by reconfiguration of geopolitics and an emphasis on global cooperation in both perception and resolution of the nuclear test. Second, with each nation positioning itself differently in the world power system, the issue was notably domesticated in the news, with Associated Press connecting the nuclear test to the broader ‘War on Terror’ framework found frequently in US media, Xinhua promoting a negotiation principle in handling the issue, and Yonhap framing the test with a ‘Cold War’ perspective. In all three cases, national political interests exerted important impacts on the construction of frames. The compatibility of the seemingly opposite packages (globalizing vs. domesticating) signifies both intensification of worldwide social relations and reassertion of national stands. This finding lends support to the transformationalist view of globalization, which suggests that the nation state still matters in a globalized world, but is being recontextualized in a more complex world of politics and culture.     

News use,nationalism, and Internet use motivations as predictors of anti-Japanese political actions in China

Although the rise of nationalistic activism in the Chinese online sphere has drawn much scholarly attention, few studies have examined how nationalism, usages, and motivations of the Internet affect nationalistic actions among general Internet users in China. Using Sino-Japanese diplomatic disputes as a testing ground, this study investigates the effects of news use from traditional and new media, nationalistic attitudes, and motivations for Internet use on anti-Japanese political behaviors such as boycotting and protest participation. Analyses of online survey data revealed that nationalism is positively correlated with information-seeking and social-interaction motivations for Internet use regarding Sino-Japanese disputes. Results also showed that the stronger the motivation for using the Internet to discuss topics associated with Sino-Japanese disputes, the more likely respondents engaged in anti-Japanese behaviors. This study indicates that nationalistic attitudes and motivations involved in the use of new media technologies have significant effects on mobilizing supporters for anti-Japanese actions.     

韩国文化产业立国战略研究

韩国的文化立国战略主要表现为文化产业立国.这一战略经由《内容韩国蓝图21》、《C韩国战略C-Korea2010》和《内容产业振兴基本计划》等历届韩国政府的重大决策而得以形成.韩国文化产业立国战略的主要内容是:强调文化产业的经济价值,注重文化产业法律制度以及政府扶持政策的制定,集中扶持重点的战略领域,将文化内容的海外市场开发作为核心目标,强调创作力度的品质,注重产业基础环境的营造及专门人才的培养.     

Effects of pelvis-shoulders torsional separation style on kinematic sequence in golf driving

The golfer’s body (trunk/arms/club) can be modeled as an inclined axle-chain system and the rotations of its parts observed on the functional swing plane (FSP) can represent the actual angular motions closely. The purpose of this study was to investigate the effects of pelvis-shoulders torsional separation style on the kinematic sequences employed by the axle-chain system in golf driving. Seventy-four male skilled golfers (handicap ≤ 3) were assigned to five groups based on their shoulder girdle motion and X-factor stretch characteristics: Late Shoulder Acceleration, Large Downswing Stretch, Large Backswing Stretch, Medium Total Stretch, and Small Total Stretch. Swing trials were captured by an optical system and the hip-line, thorax, shoulder-line, upper-lever, club, and wrist angular positions/velocities were calculated on the FSP. Kinematic sequences were established based on the timings of the peak angular velocities (backswing and downswing sequences) and the backswing-to-downswing transition time points (transition sequence). The backswing and transition sequences were somewhat consistent across the groups, showing full or partial proximal-to-distal sequences with minor variations. The downswing sequence was inconsistent across the groups and the angular velocity peaks of the body segments were not significantly separated. Various swing characteristics associated with the separation styles influenced the motion sequences.     

The effect of site quality on repurchase intention in Internet shopping through mediating variables: The case of university students in South Korea

We performed a study to determine the influence that site quality has on repurchase intention of Internet shopping through customer satisfaction, customer trust, and customer commitment. Appropriate measures were developed and tested on 230 university students of Gyeongnam province in South Korea with a cross-sectional questionnaire survey. The results of the empirical analysis confirmed that site quality can be conceptualized as a composite of six dimensions of shopping convenience, site design, information usefulness, transaction security, payment system, and customer communication. Second, site quality positively affected customer satisfaction and customer trust, but did not affect customer commitment and repurchase intention. Third, site quality can affect repurchase intention by enhancing or attenuating customer satisfaction, customer trust, and customer commitment in online transaction situation. The mediating effect of customer satisfaction, customer trust, and customer commitment between site quality and repurchase intention is identified. Fourth, site quality indirectly affected customer commitment through customer satisfaction. Customer satisfaction indirectly affected repurchase intention through customer trust and customer commitment. Thus, it is found that site quality can be a very important factor to enhance repurchase intention in the customer perspective.