基于DBN模型与Kinect数据的高尔夫挥杆重建     

吕东岳  黄志蓓  陶冠宏  俞能海  吴健康 《中国科学院大学学报》2016,33(2):204-212

人们对高尔夫运动的兴趣在过去的10年间爆发式增长,同时高尔夫球员的数量也显著增加.因此,如何训练一个球员做出适当和准确的挥杆动作已经引起研究者的广泛关注.在此类研究中最重要的步骤是挥杆动作的捕获与重建.至今为止,以Kinect为代表的深度成像设备受其基础条件的限制,其捕获的挥杆运动可能会由于运动中肢体之间的互相遮挡与肢体识别时产生的混乱丧失足够的精确度.为了从肢体互相遮挡并且分辨率较低的深度图像信息中恢复比较精确的运动信息,该文提出一个用于描述人体关节点之间空间关系与关节点动态特性的动态贝叶斯网络(DBN)模型,并基于该模型实现了高尔夫挥杆动作的重建.实验结果表明,该算法能够实现重建精度媲美商用的光学运动捕获系统(OMocap),并且比现有的深度信息修改算法具有更好的性能.  相似文献   

体育产业高质量发展系统动力机制模型建构与现实考察     

薛昭铭  刘东升  马德浩 《沈阳体育学院学报》2020,(2):116-124

通过文献资料法和案例分析法,以系统论为视角对体育产业高质量发展进行动力机制模型建构,并以江苏体育产业发展经验作为现实考察。研究认为:体育产业高质量发展作为政策性议题,其实践取向应围绕产业的商业性效益逻辑和体育的人文性功能价值进行有机融合,进而推动体育产业在社会主要矛盾、资源配置方式、产业结构模式、经济增长状态4个维度中积极寻求转向。推进体育产业转向高质量发展是一个系统问题,系统运转的关键在于形成运动项目内涵丰富的内生机制、社会进步和经济发展环境的外发机制以及业态载体和空间载体充沛的内外联动机制。当前运动项目产业化内在张力不足、外部环境要素缺位、空间载体培育良莠不齐是现实挑战。提出注重深度内涵式发展、强化务实载体建设、营造适宜外部环境3个由意识理念引领到具体工作抓手的发展思路。  相似文献   

我国体育用品制造业国际转移的趋势及动力机制——基于全球生产网络视角     

朱华友  李涵  戴艳 《武汉体育学院学报》2019,53(8):44-49

我国体育用品制造业国际转移呈现出网络化、多元化、集群化、主动化的新趋势，其动力来源有三点，一是寻求我国体育用品制造业价值链的重构，二是试图跨越后发国家可能面临的价值链固化的"网络陷阱"，三是追逐包括竞争优势和网络权力等隐形收益在内的综合利益最大化。但是，这种自觉行动和主动作为可能受到价值链上端发达国家的阻击。因此，我国体育用品制造业要利用研发设计和品牌营销价值链的发育突破门限效应，积极开展跨境并购和逆向投资活动弥补比较劣势，并逐步回归到研发本土化，利用国内中小体育用品企业构建由自己主导的价值链，以全球布局应对潜在的贸易风险。  相似文献   

1995-2014年羌族中小学生体质健康发展态势研究*     

张晓林 《广州体育学院学报》2017,37(5):75-79

依据全国学生体质与健康调研报告并结合实地调查,采用文献资料法、逻辑分析法、数据统计法和对比研究法,分别对1995~2014年间羌族7-17岁中小学生的身高、体重、胸围、肺活量、50m跑、坐位体前屈六项共性指标进行数据统计分析.结果表明:羌族中小学生身体形态发育水平总体趋势不断提升,身体素质和身体机能下降幅度有所减缓,羌族中小学生整体体质健康状况不容乐观.建议严格实施体质健康监测年度报告制度;构建"社会、学校、家庭"三位一体互动式学生体质健康促进模式;多元协同治理促进学生养成健康的生活方式、良好的体育锻炼习惯;改革供给方式加大对羌、汉族经济落后地区的体育经济投入,完善体育设施、设备等.  相似文献   

Children's responses to the interactivity of storybook apps in family shared reading events involving the iPad          下载免费PDF全文

《Literacy》2017,51(1):44-52

This paper reports on some data on the effects of screen‐based interactivity on children's engagement with storybook apps during family shared book reading that were gathered in a 2‐year, small‐scale ethnographic case study in Spain. Data analysis focuses on the complex interplay between the storybook app's interactive features and the children's responses to them. Our findings show that interactive elements increase the child's autonomy, as they tend to promote the importance of the reader, positioning him or her as a collaborator, storyteller, an author or an internal character in the fiction; something that can materialise in exciting narrative strategies that can trigger powerful responses to digital literary texts in emergent readers, including playing, creating new fictions or engaging emotionally with the story. Finally, we argue that the Reader Response models that have been used over recent decades to understand children's reading experiences with storybooks need to be revised to better understand their current experiences with interactive texts.  相似文献   

Exploring Verbal,Visual and Schematic Learners' Static and Dynamic Mental Images of Scientific Species and Processes in Relation to Their Spatial Ability     

Sulaiman M. Al-Balushi 《International Journal of Science Education》2013,35(3):460-489

The current study compared different learners’ static and dynamic mental images of unseen scientific species and processes in relation to their spatial ability. Learners were classified into verbal, visual and schematic. Dynamic images were classified into: appearing/disappearing, linear-movement, and rotation. Two types of scientific entities and their related processes were investigated: astronomical and microscopic. The sample included 79 female students from Grades 9 and 10. For the purpose of the study, three instruments were used. The Mental Images by Guided Imagery instrument was designed to investigate participants' visualization of static and dynamic mental images. The Water-Level Task was adopted to estimate participants' spatial ability. The Learning Styles Inventory was used to classify participants into verbal, visual and schematic learners. The research findings suggest that schematic learners outperformed verbal and visual learners in their spatial ability. They also outperformed them in their vividness of microscopic images; both micro-static and micro-dynamic images; especially in the case of appearing/disappearing images. The differences were not significant in the case of astronomical images. The results also indicate that appearing/disappearing images received the least vividness scores for all three types of learners.  相似文献   

试论高等教育创新的基本原则     

张贵银 《贵阳学院学报(社会科学版)》2002,(3)

目前 ,我国高等学校进一步扩大招生 ,为适应社会发展的需要各高校在课程设置、教学教法以及后勤社会化等方面都有所创新 ,进行了一系列的改革。我国高等教育的创新是高层次的创新 ,是国家创新体系的支柱和基础 ,它的创新可遵循一些基本原则 ,其中最主要的是个性培养原则、整体培养原则、动态化原则、实践性原则等  相似文献   

刑事诉讼电子证据的关联性问题研究     

臧哲 《连云港职业技术学院学报》2019,(2):38-42

电子数据是2012年《刑事诉讼法》所规定的独立证据种类,可以用于证明案件事实的电子数据被称为电子证据。在实际司法实践中,立法的缺失、理论研究的不足以及技术手段的不成熟,导致电子证据存在大量关联性认证困难的问题。以类案分析和个案探讨相结合的方式,重点对电子证据的关联性问题展开分析论述,并提出可操作性建议,以期充分实现电子证据在新时期违法犯罪活动中的最大价值。  相似文献   

从新课标看自主学习     

任清敏 《安顺师范高等专科学校学报》2005,7(1):7-8

学习必须主动、独立、创新,培养实际能力.自主学习是指具有自觉的意识和反应的学习方式.自主阅读是自主学习的关键.总结能力是自主学习非常重要的一个方面.自主学习是指教学条件下的学生的高品质的学习.  相似文献   

How to respond to journalists’ questions? A new perspective on Chinese premiers’ aggressiveness at press conferences (1993–2015)     

Feng Wu  Hong Zhao 《亚洲交流杂志》2016,26(5):446-465

This study extends the framework describing journalists’ aggressiveness at politicians’ press conference and develops five dimensions to measure politicians’ aggressiveness in response to journalists’ questions (initiative, directness, assertiveness, adversarialness, and accountability). Using the records from Chinese premiers’ press conferences (1993–2015), this research investigates five factors which might affect premiers’ aggressiveness: the administrative life cycle, economic conditions, journalists’ country of origin, the topic of questions, and number of questions. The results show that premiers exhibit less assertiveness during honeymoon periods and more assertiveness in other years. Premiers are more adversarial amid good economic growth but less adversarial during poor economic growth. They are more assertive and adversarial in response to questions related to politics and the military and less so in response to questions related to other areas. Premiers display more initiative and accountability toward journalists who ask more questions and less toward those who ask fewer questions. Premiers are more assertive and adversarial toward journalists from developed countries but less so toward those from developing countries. Over the past 23 years, premiers’ initiative, directness, and adversarialness have decreased while their accountability has gradually increased. The theoretical contributions of this research are discussed.  相似文献