一种最优无线电信道分配方案

在信道复用距离为常数,相邻的基站信道相差的条件下,研究了蜂窝状通信系统的最优信道分配问题。给出了此信道分配问题的数学模型,并论证了该模型求出的是最优解,并深入阐述了通信系统的信道分配问题。     

A rule induction framework for the determination of representative learning design in skilled performance

Representative learning design provides a framework for the extent to which practice simulates key elements of a performance setting. Improving both the measurement and analysis of representative learning design would allow for the refinement of sports training environments that seek to replicate competition conditions and provide additional context to the evaluation of athlete performance. Using rule induction, this study aimed to develop working models for the determination of high frequency, representative events in Australian Rules football kicking. A sample of 9005 kicks from the 2015 Australian Football League season were categorised and analysed according to the following constraints: type of pressure, kick distance, possession source, time in possession, velocity and kick target. The Apriori algorithm was used to develop two models. The first consisted of 10 rules containing the most commonly occurring constraint sets occurring during the kick in AF, with support values ranging from 0.15 to 0.22. None of the rules contained more than three constraints and confidence values ranged from 0.63 to 0.84. The second model considered ineffective and effective kick outcomes and displayed 70% classification accuracy. This research provides a measurement approach to determine the degree of representativeness of sports practice and is directly applicable to various team sports.     

“阳光体育”背景下山东省高校体育舞蹈教学开展现状与对策研究

运用文献资料、调查问卷、专家访谈、数理统计等研究方法,对山东省高校体育舞蹈教学的开展情况进行了调查,主要从师资队伍现状、体育舞蹈教学现状以及学生对体育舞蹈教学的评价等方面展开研究。针对目前山东省体育舞蹈教师专业水平较低、领导不够重视、场地设施缺乏等因素,提出了相应的建议,以期为山东省高校体育舞蹈教学的健全发展提供理论参考。     

Preparation time influences ankle and knee joint control during dynamic change of direction movements

The influence of preparation time on ankle joint biomechanics during highly dynamic movements is largely unknown. The aim of this study was to evaluate the impact of limited preparation time on ankle joint loading during highly dynamic run-and-cut movements. Thirteen male basketball players performed 45°-sidestep-cutting and 180°-turning manoeuvres in reaction to light signals which appeared during the approach run. Both movements were executed under (1) an easy condition, in which the light signal appeared very early, (2) a medium condition and (3) a hard condition with very little time to prepare the movements. Maximum ankle inversion angles, moments and velocities during ground contact, as well as EMG signals of three lower extremity muscles, were analysed. In 180°-turning movements, reduced preparation time led to significantly increased maximum ankle inversion velocities. Muscular activation levels, however, did not change. Increased inversion velocities, without accompanying changes in muscular activation, may have the potential to destabilise the ankle joint when less preparation time is available. This may result in a higher injury risk during turning movements and should therefore be considered in ankle injury research and the aetiology of ankle sprains.     

庄子摆脱社会之困的方法论探讨及其生态解读

庄子认为,人的一生都面临着命运、社会、自我以及环境等因素带来的难以摆脱的困境。其中,社会之困主要是指时势、儒家仁义等对人的限制或束缚。庄子对时势之困采取了安时处顺、无为而治的消解方法,对仁义之困采取了法天贵真、掊击圣人、以道释儒的化解策略。在庄子所采取的摆脱社会困境的种种策略和方法中所贯穿的都是顺物自然的生态学原则。     

从结构性约束看大众化阶段我国高等教育公共政策的选择

随着高等教育大众化阶段的来临,我国财政性教育经费和高等教育成本补偿政策均面临着诸多的结构性约束问题。为妥善处理好这些问题,促进我国高等教育的健康发展,应完善我国高等教育的公共政策选择。即强化政府财政责任,确保法定经费足额到位;弥补市场失灵,完善国家助学贷款体系;健全捐赠税收优惠政策,拓宽多元化融资渠道;允许民办高校合法营利,强化民办高校的分类监管。     

简析酒语词语义演化生成与修辞认知

酒语词语义系统，承载着主体最早的认知经验，是主体按照特定修辞方式凝结其语形语义，即主体以经验思维来描述对酒的认识，构建具有幻象意义的描述空间，在这个幻象空间中，隐含着主体内在共通的原型经验，成为具有多维修辞阐释空间的独特符号系统。文章采用广义修辞学相关原理简要分析酒语词语义演化生成与修辞认知。     

河南省高师体育院系开展网络教学的影响因素分析

文章运用文献资料法、问卷调查法、数理统计法、逻辑分析法等研究方法,分析了目前河南省高师体育院系网络教学过程中存在的实际问题,探讨了影响网络教学开展的主要因素,并提出了相应的对策,以期对当前河南省高师体育院系网络教学工作的顺利开展有所裨益。     

从胡适对古典诗词的评介看他的修辞观

胡适是中国现代一个很有见地的修辞学家,他在《白话文学史》和《国语文学史》中对古典诗词一语中的的评介,蕴含着丰富多彩的修辞观点,是中国修辞学宝贵的史料,他关于文与质、用典与白描、不讲陈词套语及具体、原则与风格的看法,是很值得认真研究与探讨的。     

四连杆变幅机构平衡重系统的优化设计

本文介绍了一种四连杆变幅机构平衡重系统的优化设计方法。它将该系统的设计归结为五维、5个目标函教、9个约束条件的数学模型,应用改进的随机方向法求该数学模型的最优解。经改进的随机方向法,对于解决机构类优化设计中经常出现的反正弦、反余弦函数变量值大于1的问题提出了笔者的看法。 文中进行了实例计算,其结果较用传统方法得出的结果有显著进步,可直接应用于实际生产。