刍议200米混合泳的动作频率与体力分配

本文通过对2000年和2003年部分世界优秀选手200米混合泳的调查分析,计算出优秀选手200米混合泳的周期参数与动作频率参数,为教练员运用这些参数提供一些参考。     

用帕斯瓦尔关系式求解一类无穷积分

用帕斯瓦尔关系式对一类无穷积分进行了求解,使其求解过程简单化.     

基于D1信号格式的数字视频信号同步技术

本文阐述了如何采用D1信号格式，利用SAV和EAV标志形成视频数字同步信号，在节约大量数字空间的同时有效地实现数字系统的同步。文中还说明了如何利用网络中的“等级制主从同步法”解决电视信号在网络传输中的同步问题．     

天津电大双向视频远程教学系统的建设和发展

天津电大双向视频远程教学系统建设是“十五”综合投资规划的重点项目,也是《天津市教育信息化发展规划》拟定的开发课题。双向视频远程教学是传统课堂面授和现代网络多媒体通讯相结合的完美形式,是天津电大远程教育网络学习环境的重要组成部分。文章从技术角度论证了该系统的设计方案和工程实践,介绍了应用情况,展望了未来的发展。     

信息化环境下教师电视教材二次开发能力培养的研究

本文提出了电视教材二次开发的概念,分析了信息化环境下教师进行电视教材二次开发的意义,介绍了电视教材二次开发的过程,提出了教师电视教材二次开发能力的培养措施。     

Adaptive foreground and shadow segmentation using hidden conditional random fields

Video object segmentation is important for video surveillance, object tracking, video object recognition and video editing. An adaptive video segmentation algorithm based on hidden conditional random fields (HCRFs) is proposed, which models spatio-temporal constraints of video sequence. In order to improve the segmentation quality, the weights of spatio-temporal con- straints are adaptively updated by on-line learning for HCRFs. Shadows are the factors affecting segmentation quality. To separate foreground objects from the shadows they cast, linear transform for Gaussian distribution of the background is adopted to model the shadow. The experimental results demonstrated that the error ratio of our algorithm is reduced by 23% and 19% respectively, compared with the Gaussian mixture model (GMM) and spatio-temporal Markov random fields (MRFs).     

范德瓦尔斯频移及线型畸变现象

从理论上研究了囚禁于两电介质间薄原子蒸汽的频率调制吸收光谱中范德瓦尔斯频移及线型畸变现象,发现在频率调制情形下频移很明显,线型则由对称类色散型转为非对称类吸收型。采用频率调制的方法解决了在很多情形下采用直接法或吸收法不易实现对vdW作用势进行精确测量的难题。     

Supporting Student Learning through Instructional Videos in Business Statistics

While statistics is an essential topic for business students, many students experience barriers to successful learning due to anxiety, motivation, or difficulty with quantitative understanding. This research examines the use of online videos with an effort to explore the relationship between student characteristics, video usage, and course performance measures. In addition, the study examines student perceptions of the supplemental resources in an effort to examine the efficacy related to student learning and performance. This study seeks to confirm previous research regarding the benefit of supplemental video resources and extend the knowledge base by understanding the impact for various types of students (e.g., level of course, level of previous academic performance, etc.). The study found that the use of the video resources varies based on students’ previous math performance and the difficulty of the material. Student ratings indicate that the videos were helpful in learning the content and that they provided an important resource when students needed additional tools to master the material. Analysis of the results provides implications for understanding how different students use online videos and offers recommendations for educators and researchers about how to enhance student success in difficult statistics coursework.     

Access数据库中OLE对象的读写操作

分析了Access数据库OLE对象的特点，并给出了在Delphi环境下实际实现OLE对象的保存、打开与显示的处理方法．     

浅谈流媒体网站的建立

：随着Internet的带宽的不断增加,多媒体技术在互连网的应用越来越广泛。多媒体信息与传统的文字、文件信息在处理上有很大的区别,多媒体信息一般以流的方式在网上传输。本文将讨论如何在网站上建立一套视频点播系统应用于远程教学等方面。