一种基于力反馈的技能虚拟训练系统构建研究

为了解决当前市面上虚拟仿真训练系统在触/力觉方面显示能力不足的问题,以一站式、全方位、多维度优化为设计目标,设计并实现了融合力（触觉）反馈的技能仿真训练系统。该方案结合力反馈方法、眩晕缓解措施、效果评价体系,最大程度上实现了用户和产品之间的交互性。通过与相关企业和院校合作,设计并实现了一款篮球投篮仿真训练系统,该系统对投篮发力进行数字化反馈式训练,表明效果较佳,具有一定推广价值。     

Peripheral vision and simple catching: The screen paradigm revisted

The importance of effector visual feedback has previously been indicated using an opaque screen to prevent sight of the catching hand for the final 150–200 ms of a flight path of 850 ms in total. Attention was drawn to the finding that the ability to position the arm correctly in the line of flight of the ball deteriorated as a consequence of the number of trials without visual feedback. However, the use of only 20 test trials allows a possibility that the proprioceptive system may be able to re‐establish predominant control under conditions of prolonged visual decrement. In order to verify this notion, the number of experimental trials was quadrupled for 24 subjects of mixed sex in a replication of the initial paradigm.

The results provided preliminary support for the view that the positioning of the catching arm is more seriously affected by visual occlusion than the timing of the grasp phase. However, increments in accuracy of limb orientation were evidenced in all screen conditions, as the number of trials increased. The grasp component of one‐handed catching appeared to remain unaffected by the increase in experimental trials. The relative influence of skill level on catching errors was next addressed by comparing the performance of the six best and worst catchers in the group.

The results did not support previous research which found a relation between skill level and error type. The number of position, but not grasp, errors decreased as a function of task practice for both subgroups. Future investigations should, perhaps, focus on the developmental nature of movement control in one‐handed catching to obtain a clearer picture of this relation.     

试论负反馈控制理论在排球教学中的作用

排球教学手段和方法是多种多样的，目的是培养学生的基本技战术能力。本文运用负反馈控制的基本理论，探讨其在教学训练中的基本应用方法和对教师教学的要求，对不同水平的教学有一定参考价值。     

基于TextRank的产品评论关键词抽取方法研究

关键词抽取技术能从海量产品评论文本中挖掘出用户关注的焦点,方便后续为用户推荐合适的产品。经典关键词抽取算法TextRank在迭代计算词汇节点的重要性得分时,忽略了邻近词汇节点的影响力差异。为此,提出一种融合TFIDF与TextRank算法（简称TFTR）抽取评论中的关键词。首先,通过引入用户浏览评论后给出的评论有用性反馈,提高有效评论中出现的重要词语权重,对TFIDF算法进行改进。然后将改进后的词频逆文档频率作为词节点特征权重引入到TextRank算法中,以改进词汇节点的重要性得分分配过程。实验结果表明,相比传统的TextRank算法,TFTR算法提取出的产品评论关键词准确性在P@10标准下提高了15.7%,证明了该算法的有效性。     

浙江省高校学生体育学习与锻炼的现状分析

对浙江14所大学的非体育专业在校学生进行调查.从学生的视角,掌握了大学生对目前高校体育现状的认识和评价.结果显示:1)学生参加课外体育活动的次数较少.2)60%以上学生自我感觉一般或较差.3)大部分学生对体育功效持肯定态度.4)75%学生对当前体育课的教学满意程度为一般或不满意,学校的体育考核制度还存在某些问题.5)学生参加体育活动的动机具有多维性,主要为消遣娱乐(35.6%)、增强体质(26.5%).6)限制大学生参加体育锻炼的因素,依次为运动场地缺乏、没有时间、没有锻炼伙伴.     

反馈环的基本状况--写存器新析之一

将两个受外来信号控制的、串联成封闭回路的非门定义为反馈环将内、外输入信号以与(或)非门形式输入的反馈环定义为与(或)非环以与非环为例，从理论上阐明了反馈环的稳态、变态(非稳态)及其条件和判别方法。     

过程英语写作中自我监控技巧运用的个案研究

自我监控技巧能使学生控制所得到的教师反馈,并且能促使教师形成有效的反馈。教师根据学生提问的要点形成直接且合适的反馈。本文采用了实证研究的方法探讨自我监控技巧在大学英语过程写作中的应用及其对写作的影响。结果表明,学生能够通过训练掌握该技巧;在写作中使用该技巧有助于教师了解学生存在的问题和想法,使学生更可能地控制所得到的教师反馈;自我监控技巧尤其对提高学生的写作组织能力有益。     

BEPCII对撞点束流轨道反馈系统设计(英文)

介绍了BEPCII(北京正负电子对撞机二期工程)对撞点束流轨道反馈系统的设计.由于BEPCII将采用双环、多束团、交叉角对撞,并且多种原因会使束流处于非最佳对撞状态甚至无法对撞,因此一套基于束-束偏转技术的对撞点束流反馈系统的建立,以使得对撞机保持在最佳对撞状态是非常必要的.此外,为了同时测量对撞点处正、负电子束的位置,两套带有8电极的特殊束流位置探测器(BPM)将安装在对撞点两侧.8电极BPM的工作原理以及采用有限元法进行模拟计算的结果在文章中也进行了介绍     

The role of feedback from the school leader during teacher evaluation for teacher and school improvement

Since the turn of the century, teacher evaluation has been introduced around the world with the intent to improve teaching. However, in the literature on teacher evaluation, often findings reveal critical accounts about the effectiveness of feedback in teacher evaluation for teacher and school improvement. This article presents a qualitative study in eight schools where teachers did indicate to find the feedback they discussed with school leaders during teacher evaluation processes useful. In this study, we investigate whether we can identify what teachers actually do with this feedback and which factors contribute to their response. Our findings demonstrate the importance of school organizational characteristics and an integrated leadership approach for the feedback response of teachers. Also, our findings reveal how teacher evaluation is used in these schools to further school improvement.     

重视信息反馈办好《实用乡村医生杂志》

依据系统科学基础理论探讨科技期刊信息传播中读者信息反馈的重要意义及其作用。简介在编辑工作实践中树立读者意识，注重读者信息反馈，使刊物的传播效果达到优化的做法与体会。