The expected value of possession in professional rugby league match-play

This study estimated the expected point value for starting possessions in different field locations during rugby league match-play and calculated the mean expected points for each subsequent play during the possession. It also examined the origin of tries scored according to the method of gaining possession. Play-by-play data were taken from all 768 regular-season National Rugby League (NRL) matches during 2010–2013. A probabilistic model estimated the expected point outcome based on the net difference in points scored by a team in possession in a given situation. An iterative method was used to approximate the value of each situation based on actual scoring outcomes. Possessions commencing close to the opposition’s goal-line had the highest expected point equity, which decreased as the location of the possession moved towards the team’s own goal-line. Possessions following an opposition error, penalty or goal-line dropout had the highest likelihood of a try being scored on the set subsequent to their occurrence. In contrast, possessions that follow an opposition completed set or a restart were least likely to result in a try. The expected point values framework from our model has applications for informing playing strategy and assessing individual and team performance in professional rugby league.     

Perceptual-cognitive expertise of handball coaches in their young and middle adult years

There is little research investigating the maintenance of perceptual-cognitive expertise in general and even less comparing coaches of different ages. The aim of this study was to test for perceptual-cognitive differences between age groups, licence levels, and their interaction. This study investigated differences in skilled performance between young and middle-aged coaches of three different skill levels. Participants performed an accuracy-oriented pattern recall (mean distance in pixel) and a time-oriented flicker test (mean detection time in ms). There were some significant differences between age groups and between skill groups for both tests, but no interactions. For the pattern recall test, the effect sizes were larger for skill level differences, while for the flicker test effects were larger for ageing. These results suggest coaches are able to maintain accuracy skills better than reaction timed tasks. This is in line with findings on speeded performance in general populations, which show declines with age. Moreover, results also support findings on perceptual expertise in skills where accuracy was important.     

信息咨询服务的创新发展与用户需求特点分析

文章对当代图书馆信息咨询服务工作随着网络时代的到来呈现出的创新变化和用户需求的特点进行了分析 ,提出当代图书馆信息咨询服务的发展方向和策略     

第17届排球世锦赛中外女排进攻效果对比研究

运用录像观察、数理统计和对比分析等方法,对中外女排在第17届世锦赛中扣球技战术运用情况进行研究。结果表明：中国女排是以两边拉开进攻为主并结合高度与速度等快变战术为一体的技战术打法;进攻战术的总体运用效果十分理想,与其他各国相比扣死率较高且失误率低;后排攻在比赛中展现出了强大的实力,但在强攻和快攻方面与巴西、美国等欧美强队相比还存在一定差距。建议中国女排应进一步加强对强攻能力的训练,尤其要努力丰富年轻队员的大赛阅历以保证其技术发挥的稳定性;在面对欧美强队时应努力提高一传到位率,并加强进攻队员之间的掩护配合,使各种快变战术能够在比赛中得到有效发挥,并尽量避免自身进攻方式及手段的单一化。     

无机物质数据库系统的研究与开发

无机物质数据库系统的开发过程.分为需求分析,流程分析,开发及运行环境选择,设计与实现四个步骤,该系统的运行情况证明使用该系统管理数据可显著提高生产率.     

传统媒体融合发展的阶段和策略

媒体融合发展是当前国内传统媒体面临的迫切任务,从媒体融合发展的趋势和规律看,笔者认为传统媒体的融合发展过程可能需要经历三个主要的渐进发展阶段,为此,传统媒体也要采取有针对性的发展策略。     

论“篮板球”在现代篮球竞赛中取胜的积极作用

本文在提出篮板球的有关概念以后,全方位、多层次分析论述了篮板球在现代篮球竞赛中取胜的积极作用,阐明篮板球对篮球策略运用的重要意义。通过对这些问题的分析研究,可以增强读者对篮板球在现代篮球竞赛中取胜的积极作用的信念,明确篮球战术的发展方向。并可作为指导篮球训练与比赛实践的理论参考。     

文献梳理、适切性分析与路径选择:信息化教学类比赛促进职校教师专业发展研究

在国家积极推动教育信息化的时代背景下,信息化教学类比赛为职校教师的专业发展提供了新的路径选择。在文献梳理的基础上,厘清了教师专业发展的三个维度以及技术(特别是信息技术)促进教师专业发展的相关理论,指出了信息化教学类比赛促进职校教师专业发展是具有坚实理论支撑的,分析了信息化教学类比赛与职校教师专业发展所具有的适切性。结合信息化教学类比赛的实际案例,提出了信息化教学类比赛促进职校教师专业发展的路径:研学比赛文件、微课育人及利用网络构建学习共同体。     

在数学课堂教学中学生创新能力的培养

创新能力是现代社会对人才的基本要求;数学是中小学阶段培养学生创新能力的特殊而重要的学科。文章从创新性的结构,即非智力因素和智力因素两个方面,探讨如何通过数学课堂教学培养学生创新能力。     

计算机网络安全策略简述

随着电子商务时代的到来 ,计算机网络的全局性安全得到广泛关注 .就计算机网络的安全策略作一简要的陈述 .