TRUE UPPER BOUNDS FOR BERMUDAN PRODUCTS VIA NON-NESTED MONTE CARLO

We present a generic non-nested Monte Carlo procedure for computing true upper bounds for Bermudan products, given an approximation of the Snell envelope. The pleonastic "true" stresses that, by construction, the estimator is biased above the Snell envelope. The key idea is a regression estimator for the Doob martingale part of the approximative Snell envelope, which preserves the martingale property. The so constructed martingale can be employed for computing tight dual upper bounds without nested simulation. In general, this martingale can also be used as a control variate for simulation of conditional expectations. In this context, we develop a variance reduced version of the nested primal-dual estimator. Numerical experiments indicate the efficiency of the proposed algorithms.     

Balance and agility training does not always decrease lower limb injury risks: a cluster-randomised controlled trial

The objective of this study was to examine the effects on lower limb injury rates of adding structured balance and agility exercises to the 80-day basic training programme of army recruits. A blocked (stratified), cluster-randomised controlled trial was employed, with one intervention group (IG) and one control group (CG), in which 732 male and 47 female army recruits from the Australian Army Recruit Training Centre participated through to analysis. The IG performed specified balance and agility exercises in addition to normal physical training. The incidence of lower limb injury during basic training was used to measure effect. Analysis, which adhered to recommendations for this type of trial, used a weighted paired t-test based on the empirical logistic transform of the crude event rates. The intervention had no statistically significant effect on lower limb injury incidence (RR = 1.25, 95% CI 0.97–1.53, 90% CI 1.04–1.47), on knee and ankle injury incidence (RR = 1.08, 95% CI 0.83–1.38), and on knee and ankle ligament injury incidence (RR = 0.98, 95% CI 0.64–1.47). We conclude that the intervention, implemented in this fashion, is possibly harmful, with our best estimate of effect being a 25% increase in lower limb injury incidence rates. This type of structured balance and agility training added to normal military recruit physical training did not significantly reduce lower limb, knee and ankle, or knee and ankle ligament injury rates. Caution needs to be used when adding elements to training programmes with the aim of reducing injury, as fatigue associated with the addition may actually raise injury risk.     

加强安全技能培训 提高高校实验室安全管理

本文对高校实验室造成人员、财产损失的安全事故原因进行分析,主要从安全知识和技能培训、紧急预案制定和演练等方面阐述加强实验室安全培训对提高实验室安全管理工作的作用。     

瑜伽活动在我国推广的成因及存在问题分析

对我国的瑜伽健身项目的推广成因以及推广过程中存在的问题做了详细分析,为该健身项目推广模式的构建奠定了理论基础。     

Reassessing the Structure of Enduring Leisure Involvement

The study compared the importance of spending time in interacting with nature to other leisure activities regarding recovery from work demands. In addition, a multiple mediation model between time spent in interacting with nature and need for recovery through four mediators was tested. Employees of five organizations answered a questionnaire (N = 527). Exercise and being outdoors during free-time was evaluated as the most effective activity for recovery from work stress, and the time spent in interacting with nature was mentioned as second in importance. Time spent in exercise and being outdoors, life satisfaction, and relaxation mediated significantly the relationship between time spent in interacting with nature and need for recovery from work.     

高职院校体育课的练习密度与运动负荷的研究

本论文通过观摩、测试的方法,对高职院校体育课的练习密度和运动负荷进行分析和总结。运用测试、调查分析,总结出体育课的练习密度与运动负荷是衡量体育课的教学质量,是测定体育课的教学质量的重要手段和主要依据,从而发现高职院校体育课教学存在着许多的问题,同时为高职院校体育课教学质量的提高提供科学理论依据。     

陕西省高校女生体育锻炼习惯的现状调查与分析

本文通过对陕西省部分高校女生进行体育锻炼习惯现状的调查,采用多种研究方法,从体育意识、体育动机、体育行为等多角度、多方位对高校女生体育锻炼习惯的现状进行调查,并从个体、学校、社会、家庭等多方面因素进行分析和探讨,为寻求解决对策提供帮助。     

论瑜伽运动与高校校园体育文化关系

文章运用文献资料等研究方法,结合社会学、文化学等有关知识,分析了瑜伽运动蕴涵于高校校园体育文化,又独立于高校校园体育文化,两者之间具有交互影响的动态关联关系,对两者的互动关系进行分析。探讨了高校是瑜伽运动与校园体育文化耦合的内部关系,社会是瑜伽运动与校园体育文化耦合的外部关系,学生是瑜伽运动与校园体育文化耦合的内化关系。     

硒与运动

硒是与人体健康密切相关的必需微量元素之一。硒过量或不足都会给机体带来不利影响。由于硒及含硒酶所具有的强抗氧化作用对于提高机体运动能力及对运动后疲劳的恢复具有重要作用，近年来，已受到国内外运动医学界的广泛关注，并有许多学者做了大量工作。文章在简要介绍硒元素生物学作用的基础上，重点综述了硒与运动的研究进展情况，并对其机制进行了总结。     

高校瑜伽选项课中运用处方教学模式的可行性研究

在高校瑜伽选项课的教学中,根据学生的学习、健身、防病、治病的需求,结合瑜伽项目的特点,运用处方教学模式,能明晰学生的学习目标,进行有计划、有针对性的教学,进一步提高课堂教学效果,让学生在课后能主动运用瑜伽进行健身锻炼,发掘瑜伽课更大的潜能。