Evaluation of thermal and evaporative resistances in cricket helmets using a sweating manikin

The main objective of this study is to establish an approach for measuring the dry and evaporative heat dissipation cricket helmets. A range of cricket helmets has been tested using a sweating manikin within a controlled climatic chamber. The thermal manikin experiments were conducted in two stages, namely the (i) dry test and (ii) wet test. The ambient air temperature for the dry tests was controlled to ∼23 °C, and the mean skin temperatures averaged ∼35 °C. The thermal insulation value measured for the manikin with helmet ensemble ranged from 1.0 to 1.2 clo. The results showed that among the five cricket helmets, the Masuri helmet offered slightly more thermal insulation while the Elite helmet offered the least. However, under the dry laboratory conditions and with minimal air movement (air velocity = 0.08 ± 0.01 ms⁻¹), small differences exist between the thermal resistance values for the tested helmets. The wet tests were conducted in an isothermal condition, with an ambient and skin mean temperatures averaged ∼35 °C, the evaporative resistance, R_et, varied between 36 and 60 m² Pa W⁻¹. These large variations in evaporative heat dissipation values are due to the presence of a thick layer of comfort lining in certain helmet designs. This finding suggests that the type and design of padding may influence the rate of evaporative heat dissipation from the head and face; hence the type of material and thickness of the padding is critical for the effectiveness of evaporative heat loss and comfort of the wearer. Issues for further investigations in field trials are discussed.     

小康社会进程中益阳地方舞龙运动现状调查及发展对策研究

舞龙运动是一项民族传统体育,是民间体育项目中具有中国文化传承意义的体育项目,它承载着中华民族悠久而灿烂的历史文化,是中华文化传播广泛的重要载体.目前舞龙运动已逐渐成为一种具有鲜明传统体育特色的文化,且慢慢趋向于竞技化.综合运用文献资料法,问卷调查法,数据统计法等研究方法,对在小康社会进程中益阳民间舞龙运动的现状进行较为细致的调查研究,主要是从益阳民间舞龙运动的发展现状和龙队运行情况2个方面入手,并对当地群众及龙队所给的意见整理分析,给益阳民间舞龙运动的未来发展做了一些探讨,并提出相应的对策.     

Fair referee assignments for professional football leagues

Assignment of referees to football games is an important problem faced in professional football leagues. Despite its importance, the problem has received limited academic attention. This paper presents a model and analysis of the problem for fair referee assignments, and develops a constructive heuristic and a local search procedure for its solution. Results from an extensive computational study show that the methods are effective in solving the problem in a second of computation time and yielding an excellent solution quality.     

Automatic composition of broadcast sports video

This study examines an automatic broadcast soccer video composition system. The research is important as the ability to automatically compose broadcast sports video will not only improve broadcast video generation efficiency, but also provides the possibility to customize sports video broadcasting. We present a novel approach to the two major issues required in the system’s implementation, specifically the camera view selection/switching module and the automatic replay generation module. In our implementation, we use multi-modal framework to perform video content analysis, event and event boundary detection from the raw unedited main/sub-camera captures. This framework explores the possible cues using mid-level representations to bridge the gap between low-level features and high-level semantics. The video content analysis results are utilized for camera view selection/switching in the generated video composition, and the event detection results and mid-level representations are used to generate replays which are automatically inserted into the broadcast soccer video. Our experimental results are promising and found to be comparable to those generated by broadcast professionals.     

基于ARM内核单片机的体育比赛模拟控制系统

构建体育比赛模拟控制系统,提高对体育比赛的现场智慧化管理和信息调度能力,提出基于ARM内核单片机的体育比赛模拟控制系统设计方法。采用实时视频和图像检测方法,构建体育比赛现场赛事的模拟数据传输和图像分析模型,通过过程化的线性调度和赛事流程规划和控制,采用可视化的视频远程监控方法实现对体育比赛的现场赛事的视景仿真和动作特征点分析,采用赛事分布视频动态特征提取方法,实现体育比赛现场赛事管控特征分析。构建体育比赛现场的动态参数数据集预处理模块、信息传输模块、视频监测与回放模块和人机交互模块等,采用ARM内核单片机控制方法建立体育比赛模拟控制系统的核心处理器,构建体育比赛过程状态可视化云平台的服务器,通过五层结构体系设置的模拟控制系统的体系结构模型,结合总线传输控制技术实现控制系统硬件和软件设计。测试结果表明,设计的体育比赛模拟控制系统人机交互性和视频传输控制能力较好,控制收敛性较好,能实现体育比赛现场智能监控和动态控制。     

Characterising and exploiting workloads of highly interactive video-on-demand

This paper presents a detailed characterisation of user behaviour for a series of interactive video experiments over a 12 month period, in which we served popular sporting and musical content. In addition to generic VCR-like features, our custom-built video-on-demand application provides advanced interactivity features such as bookmarking. The dramatic impact of such functionality on how users consume content is studied and analysed. We discuss in detail how this user behaviour can be exploited by content distributors to improve user experience. Specifically, we study how simple dynamic bookmark placement and interactivity-aware content pre-fetching and replication can reduce the impact of highly interactive media on CDN performance.     

人文性体育教学对学生人格教育的影响

长期以来,我国就一直把“增强体质为主进行全面发展教育”作为学校体育的基本思想和方法,忽视了对学生的人格精神教育。现代教育,需要对体质教育思想作进一步拓展和升华。向人的精神层面拓展,利用人文性的体育教学,“以人为本”充分张扬学生个性,在教学的各个环节,挖掘体育精神元素,注重对学生人格精神的塑造,促进学生身心全面发展。     

基于C/S模式的体育事业统计年鉴信息系统设计与实现

本文以历年《中国体育事业统计年鉴》中的积累数据为研究对象，通过对各类统计数据表的分析，运用数据库技术和软件工程方法，确定表的结构，建立年鉴数据库；研究运用c#语言设计开发基于网络的c/s模式前端客户端，对数据库进行添加、删除、修改、查询、导出等相关操作，实现对《中国体育事业统计年鉴》数据的网络化管理。     

导高职学生走进健身广场提升运动技能的探析

学校体育工作不仅是教育事业的有机组成部分,而且是全民健身事业的重要内容,还是全体公民终身体育的教育基础,为了使学生全面适应社会的发展,跟上时代的步伐,我们必须开发有效的学习手段来增强学生的学习能力,以适应现代教学需要和社会的需求。     

厦门市集美文体中心结构设计

文化体育类公共建筑不同于普通的住宅,常常会出现大跨度钢结构屋面,空旷结构等复杂的结构形式,本文通过集美文体中心结构设计的实例,对结构体系的选择、结构分析计算的难点进行了详细的论述,为此类公共建筑的设计总结出一套有效的设计分析方法。