基于录像分析背景下的代数课堂教学语言研究——以两堂《分式的乘除》课堂实录为例

量化分析《分式的乘除》两堂录像课,参考弗兰德提出的"Flanders互动分析系统"师生语言分类,将代数课堂教学语言进行分类,并就不同教学环节,对教学语言比较分析,得出以下结论:(1)课堂教学中,教师的教学语言所用时间占有很高的比例,各种类型的教学语言的时间比例不同,以提问性语言为主;(2)代数课堂教学中两位教师在各个教学环节中教学语言所占时间比例不同,例题讲解、练习讲解环节教师语言所占的比例最大;(3)代数课堂教学各个环节中,教师大多采用提问性为主的教学语言;(4)课堂教学中,应适当减少命令性语言和提问性语言,适当增加启发性语言、反馈性语言和激励性语言,以提高教学效果.     

Video diaries: a tool to investigate sustainability-related learning in threshold spaces

This paper takes as a case study an undergraduate field class from a UK university to rural Uganda. It describes and evaluates the use of video diaries as a tool for investigating the process of transformative learning in the context of education for sustainability. The applicability of threshold concept theory to this learning is investigated. Results show the video diary technique to be much more successful in capturing the development of student learning than written diaries. Despite some practical difficulties, rich data were generated. Analysis demonstrated that learning met three of the five criteria for threshold concepts: the learning was transformative, integrative and troublesome. Further research could test whether the learning in this case study met the threshold concept criterion of irreversibility. Further elaboration of the theoretical relationship between threshold concepts, transformative learning and education for sustainability is also needed. It is concluded that the video diary method is potentially transferable to other educational research contexts and may be particularly suitable for researching learning in threshold spaces.     

3DV quality model based depth maps for view synthesis in FTV system

Depth maps are used for synthesis virtual view in free-viewpoint television (FTV) systems.When depth maps are derived using existing depth estimation methods,the depth distortions will cause undesirable artifacts in the synthesized views.To solve this problem,a 3D video quality model base depth maps (D-3DV) for virtual view synthesis and depth map coding in the FTV applications is proposed.First,the relationships between distortions in coded depth map and rendered view are derived.Then,a precisely 3DV quali...     

Video retargeting using optimized crop-and-scale

Mobile devices are increasingly powerful in multimedia transmitting and browsing. However, the small screen and different aspect ratios of mobile devices lower visual quality while watching images or videos. Video retargeting is aim at fitting an existing video into arbitrary size and aspect ratio. Previous content-aware retargeting methods are mostly high computational cost, which limits their applications on the portable devices with low computation ability. In this paper, a new crop-and-scale approach is presented to adapt video to better suit the target display. We automatically find the optimal parameters of cropping window using the dynamic programming method, and then scale it to fit the target display. The cropping window can smoothly shift during a shot to follow the movement of important objects. The retargeting results using our approach introduce no deformation and jitter effects over the whole video. Experimental results show the success of our approach on adapting a variety of source videos to small display sizes.     

从奥斯卡金像奖看不同时期好莱坞电影的发展变化

奥斯卡奖作为好莱坞的风向标,对世界影坛的影响举足轻重。文章通过对奥斯卡奖历程的回顾,分析好莱坞电影在不同发展时期的特点,探讨其传播方式和传播目的的转变。     

大西洋两岸的巴赞

经典电影美学中最重要的理论家——巴赞在英美电影美学和欧洲电影美学中有着不同影响。通过这些不同影响来描述当代西方电影美学发展的两种不同方向,及其造成的不同效果,对于亟待发展的中国电影产业和中国电影美学提供了重要的启示。     

网络体育直播的受众互动研究——以腾讯体育NBA频道为例

本文在深入剖析腾讯网NBA直播的方式与策略的基础上,提出了目前腾讯直播中存在的创新不够、直播人员专业性有待提高以及对用户服务力度不足等三个方面的问题。然后提出了腾讯体育NBA视频直播未来的发展方向:以互动性创新带动发展、提高直播人员专业性水平、优化用户的观赛体验等。最终以提高腾讯体育直播的受众互动性,从而提高腾讯体育直播在互联网时代多平台竞争下的竞争力,助力于网络视频体育直播的发展。     

流媒体课件中流式素材的制作

探讨了流媒体课件中流式素材的制作，主要论述了流式文本、流式音频和流式视频素材的制作方法与制作技巧。给出了具体的制作实例，分析了流化的过程和流式文件的有关属性。     

铁电薄膜的相变和介电性质的格林函数理论研究

对用格林函数方法研究铁电材料的相变性质和介电性质的研究作了一个较为详细的分析和总结，对现有文献中的处理方法进行了讨论。     

浅论视频会议给现代企业管理带来的机遇

视频会议是当前发展最快的多媒体通信方式，它克服了传统会议模式的种种弊端，并具备传统会议模式所无法具备的优势，它为企业在越来越激烈的竞争环境中获得更多及时、可信的信息，提高企业的决策速度和水平，从而使企业的管理水平提高，获得更多的市场机会和巨大的利益。