Visual dependency and postural control on swing performance in golf players

Abstract

Individuals have to reweight the respective contribution of the different sources of sensorial information for regulating posture and balance, especially during fine task execution. Given the evidences indicating strategy during swing performance as associated with prioritization of task-relevant visuospatial information for skill execution, the aim of the present work is to assess differences in visual dependency (VD) and postural control in a population of expert (EXP) and non-expert (NEXP) golfers when compared with healthy subjects (HC) and to discover possible relationships between these outcomes and swing performance. Thus, 15 golfers (EXP?=?7; NEXP?=?8) and 32 matched HC underwent otoneurological testing including video Head Impulse Test, posturography and Rod and Disk Test (RDT). Golf players also underwent a swing session procedure, which performance was measured by means of the Flightscope X2 Doppler-radar launch monitor system. EXP subjects demonstrated significant (p?<?0.05) lower values in i) counter-clockwise (CCW) and clockwise (CW) dynamic conditions when compared with both NEXP and HC subjects RDT outcome measures and ii) surface and length posturography values as compared with HC subjects. When treating golf players outcomes as ‘a continuum’, CCW and CW scores were found to positively correlate with both lateral distance and horizontal launch angle and to negatively correlate with spin rpm. In conclusion, the present study suggests that the high-level of visual-independency demonstrated by EXP subjects may be functionally related in expert golfers to an effective motor strategy preferentially not referring to an inappropriate reliance on visual input.     

A distributional analysis of the effect of physical exercise on a choice reaction time task

Abstract

The aim of this study was to examine the facilitating effects of physical exercise on the reaction process. Eleven participants with specific expertise in decision-making sports performed a choice reaction time task during moderate sub-maximal exercise (90% of their ventilatory threshold power). Participants were tested at rest and while cycling. During exercise, the participants were faster, without being more variable. We suggest that the effect of exercise on cognitive performance was due to a major generalized improvement of the whole distribution of response time and, although the benefit effect was small, it was consistent throughout the entire range of reaction times.     

135MW机组汽轮机注油试验出现的故障分析与处理

通过对一台135MW的汽轮机在注油试验中出现的故障分析与处理,阐述了汽轮机在做注油试验过程中出现故障的分析及处理方法。     

浅谈讨论式教学对应用型软件工程人才创新思维能力培养的作用

创新思维能力是人才培养的关键,特别是对于知识变化快的应用型软件工程专业。学生创新思维能力的培养,重要一环是让学生养成开放性思维,主动思考,发现问题并解决问题,而不拘泥于相信教材和老师。讨论式教学刚好提供了学生这样的机会,是创新思维能力培养的一个有力途径。文章深入分析讨论式教学的认知加工特点及其在创新思维培养中的作用,并进行了专业选修课的讨论式教学实践。     

基于动态二维图像序列的三维步态识别方法

针对在当前二维步态识别系统中,受到人体走路姿势中的特征重叠的影响,不能很好的解决信息丢失问题。而三维识别也面临着技术要求复杂,对设备角度要求高的问题,本文提出了一种基于动态二维图像序列的三维步态识别方法。利用摄像机采集单帧步态图像序列,通过对单帧连续通信进行坐标动态转换,对特征矩阵进行有效的三维转化,计算三维特征数据,提取三维人体单帧二维图像转化的特征,进行步态识别。结果表明,本方法无需复杂的设备,能够解决特征丢失问题,识别准确度有了较好的改善。     

广东省电子废弃物规范管理协同机制

为弥补目前广东省电子废弃物回收处理体系的不足,运用协同学的理论和方法,提出广东电子废弃物规范管理协同机制的概念,并分析其协同机理和能够获取的协同效应。该机制能够实现广东电子废弃物回收处理的各主体、全过程、多方位的集成管理。     

新生代员工核心自我评价与工作投入的关系:有调节的中介模型

采用核心自我评价量表、工作投入量表、心理授权量表和不匹配感知量表对16家企业447名新生代员工进行调查,通过层级回归分析新生代员工核心自我评价与工作投入的关系,以及考察心理授权与过度教育在此关系中发挥的作用。结果表明:(1)新生代员工核心自我评价对工作投入有显著正向影响;(2)心理授权在核心自我评价和工作投入关系中有着部分中介效应;(3)过度教育对心理授权中介效应的调节作用成立,对过度教育的高感知不仅削弱了核心自我评价与心理授权的正向关系,也进而弱化了心理授权对工作投入的积极作用。     

基于LabVIEW的数据采集及分析系统的开发

采用虚拟仪器技术可实现软硬件资源的共享,便于不同自动测试系统的组建,同时还可更加有效地应用计算机所具备的各种功能,实施图像化显示、信号分析、处理和存储数据等各种作业。文章基于LabVIEW的虚拟仪器技术对数据采集及分析系统的开发进行研究和分析。     

CAD/CAM技术在苗族银饰加工中的应用

CAD/CAM技术在苗族银饰中的应用要继承文化、艺术风格和典型加工工艺上的传统,保证在提高生产效率的同时不会让苗族银饰这一人类物质文化变味。要充分利用CAD/CAM强大的三维设计功能,快速设计出美观漂亮的新图案,利用软件CAM功能和数控加工设备快速高效地加工出银饰模具,提高整个苗族银饰产业的生产能力。     

加工时间可变的总完工时间排序两人合作博弈问题

研究工件加工时间与开始加工时间有关的情况下,两人合作共同加工一批工件的纳什博弈问题．每人有一台机器用于工件加工,以最小的总完工时间作为加工成本,通过确定这批工件的一个合理划分,使参与合作加工的两人都能得到满意的合作收益．