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排序方式： 共有558条查询结果，搜索用时 31 毫秒
91.
自动组卷系统是计算机辅助教学的重要组成部分,而遗传算法以其全局寻优和智能搜索的特性,得到了广泛的运用。根据自动组卷系统的特点,将遗传算法合理应用于自动组卷中,在遗传算法中,设计了双种群机制,并以试卷难度、试卷区分度、试卷的估计用时、知识点分布为基础构造适应度函数,通过轮盘赌选择方法、多点交叉和变异,较好地解决了自动组卷的多重目标寻优问题。 相似文献
92.
Rossella Sacchetti Andrea Ceciliani Andrea Garulli Andrea Masotti Giuseppe Poletti Patrizia Beltrami 《Journal of sports sciences》2013,31(7):633-640
Abstract A cross-sectional study was carried out to analyse, through a limited number of fitness tests, the main conditioning and coordinative abilities in children aged 8–9 years, and their relationship with gender, anthropometric variables and physical activity habits. The height and weight of 256 boys and 241 girls were measured and information about physical activity habits was collected using a self-administered questionnaire. Physical performance was assessed by means of a few standardised tests: ‘sit & reach’, medicine-ball forward throw, standing long jump, 20 m running speed, and forward roll test. In both boys and girls, body weight and Body Mass Index (BMI) were positively correlated with the medicine-ball throw performances and negatively correlated for the standing long jump and speed tests, while no association was found with tests measuring back flexibility and total body coordination. Daily physical activity and participation in sport were not significantly correlated with body weight and BMI, but were positively associated with children's motor performance. The standardised fitness tests selected in the current study have been found to be suitable to identify fitness levels of primary school children. Thanks to their limited number and ease of measurement, they can be used in any school context to classify children and for monitoring the effects of targeted interventions promoting physical activity. 相似文献
93.
94.
Peter A. Hastie Alice M. Buchanan Danielle D. Wadsworth Brandon J. Sluder 《Research quarterly for exercise and sport》2013,84(4):788-791
Abstract The purpose of this study was to determine if factor patterns of selected sports skills were similar for two samples, a skilled sample and one consisting of a wide range of skills. Comparisons were also made with kinesiological evidence regarding the patterning of basic sports skills. Data consisting of performance scores on various sports skills were available for 166 high school girls. Out of this sample, a smaller sample was drawn consisting of 69 girls who were above average in skill. Two factor models, alpha and incomplete image analysis, were used in the analysis of this data. The factor pattern of selected sports skills performed by subjects above average in skill was similar in many respects to that of a sample which included a wide range of skill. The primary difference lay in the clustering of overarm skills which appeared in the above-average factor pattern. The overarm and push patterns of the above-average sample resembled the patterns of skill obtained through kinesiological analysis. The structure of kicking, underarm, and sidearm skills remained obscure, based on the results of factor analytic techniques. 相似文献
95.
The re-entry of South Africa into the international sporting arena and the resultant need for the identification and development of talent, especially among formerly deprived groups of people, provided the incentive for this study. Its aim was to identify the physical, motor and anthropometric variables that will enable coaches to identify 10-year-old boys, based on their abilities, who could become successful rugby players. Altogether, 173 ten-year-old boys with no rugby experience from a cross-section of the population were selected at random and subjected to 14 physical and motor tests and 14 anthropometric measurements. From 22 schools which participated in the Western Transvaal primary schools under-11 rugby league, the three top teams (n = 45 individuals) were selected and also tested. The results from these three teams were used as the criteria for rugby talent among 10-year-old boys. To establish the best predictors of talent, a stepwise discriminant analysis was conducted: this indicated eight variables (four motor and four anthropometric) that discriminated maximally between the talented and the rest of the players of this age. With classification functions based on these eight variables, 93.8% of all the subjects were classified correctly, indicating good validity. A canonical analysis, based on the selected variables, was then conducted on all the under-11 teams that played in the league in the region (n = 330), and they were ranked according to the scores of the first canonical variable from the most to the least talented. By comparing these results with the players who were chosen for the region's primary schools team, a success rate of 88% in prediction of talent was established. We conclude that this is a successful and practical method to aid the teacher and the coach in selecting and developing talent among 10-year-old rugby players in South Africa. 相似文献
96.
运用战略管理中的SWOT分析法,结合相关文献资料,对毽球运动纳入全民健身服务体系的内部优势和劣势,外部机会和威胁四个维度进行分析总结。结论和对策:为了使毽球运动科学有效地服务于全民健身,应充分发挥毽球运动组织管理的优势,广泛利用传统体育公法日益完善的机会,积极克服毽球运动人力资源不足的弱点,有效化解西方强势体育文化的威胁。 相似文献
97.
为探索我国城市全民健身事业的发展,文章采用文献资料、调查研究、专家访谈等研究方法,对辽宁阜新市建设"全民健身示范城"的理念及实践过程进行了研究。认为阜新市建设"全民健身示范城"以体育文化发展为主线,通过建设以城乡体育服务一体化为基础;以篮球运动为核心项目;以蒙古族体育运动为特色;以满足城乡不同社会阶层市民强身健体、娱乐休闲、防病抗癌需求的健身网络,形成多元化的科学健身公共体育服务体系。将健身思想凝练成可操作的行为模式,改变市民不良的生活方式和生活习惯,提升市民精神文化和物质文化需求品味。 相似文献
98.
运用专家访谈法、问卷调查法等科研方法,对襄阳市柔力球运动发展现状进行调查及分析,发现柔力球运动在襄阳市的发展较好,运动师资、裁判储备较为丰富,锻炼群体主要是退休中老年女性,锻炼方式主要以柔力球套路为主,在襄阳市学校体育领域处于起步阶段,发展总体前景乐观.提出健全柔力球协会组织,加强教练员、裁判员的业务学习,进校园活动要继续坚持,加强与本市高校合作及充分利用媒体手段对柔力球运动进行宣传等对策. 相似文献
99.
探寻大学生生活方式与其体质的关系,为全面提高大学生体质状况提供理论借鉴。通过问卷调查法、体质测试法和数理统计法,研究分层随机抽样的安徽省6所高校957名在校全日制本科大学生的生活方式与体质的关系。结果表明:大学生生活方式及各因子与体质及体质各指标之间存在显著相关,大学生生活方式对其体质存在一定预测性,但相关系数和回归方程的解释力度较小,还有待于从纵向上,对大学生生活方式与其体质的关系进行跟踪调查研究。 相似文献
100.