标准化考场建设方案

文章基于标准化考场视频监控系统的建设要求,阐述系统设计及整体架构,旨在提高高校管理水平。     

‘Lights,Camera, Action!’ Video Technology and Students' Perceptions of Oral Communication in Accounting Education

Abstract

This paper examines the influence of an authentic assessment item on three dimensions of oral communication in accounting education: skills, self-efficacy, and relevance. An explanatory mixed methods design is used to explore students' perceptions of their development. The results indicate that an elevator pitch assessment has a positive impact on all three dimensions. In particular, the employed video technology fosters greater self-awareness and a more accurate perception of skill levels, and enhances students' self-efficacy. The contextualised learning experience also enables students to better appreciate the relevance of oral communication to their future careers. The paper extends the literature on video technology, self-efficacy, and generic skills development in accounting education, and provides relevant stakeholders with evidence of an authentic activity that can assist with bridging the skills-expectation gap.     

基于Syntax级分组和多线程处理的HEVC熵编码并行算法

新一代视频编码标准HEVC获得了较高的编码效率,但是同时需要较大的计算量。HEVC并行算法能够提高编码速度,如何开发适用于多核处理器的并行编码算法对于满足高清视频实时传输和大规模共享具有十分重要的意义。提出了一种基于Syntax级分组和多线程处理的HEVC熵编码并行算法。该算法首先将HEVC中一个编码树单元的编码信息按照语法元素进行分组;其次,根据编码块数据间的相关性构建Syntax级并行编码器;然后结合多线程技术实现HEVC帧级编码的并行计算。实验结果表明,在编码图像的主客观质量上没有太大损失的情况下,该并行算法框架与传统的串行算法框架相比具有65%~70%的加速效果。     

监控系统中视频信号传输的设计

文章介绍了视频监控系统中常用的几种视频信号传输方式,如同轴电缆、双绞线、光纤等传输方式。     

基于VFW的视频采集设计

针对视频电话、视频会议等系统的实时视频采集的需求,研究基于VFW接口的视频采集方法。使用VFW接口枚举并打开视频设备,在回调函数中实现对视频帧的获取和压缩。     

无人机数字视频图像传输技术

提出了无人机测控系统数字视频图像传 输系统的设计方案,分析了RS+卷积编码体制对编码数据块的定位需求,提出了用帧同步环 定位 编码数据块的方法。针对帧同步环对数据流的特殊要求,讨论了由FPGA数字系统自身导致的 速率匹配问题,提出了相应的解决方法。     

关于FMO分离模式下H.264/AVC视频传输误差控制的研究

H.264/AVC视频压缩标准对信道错误的鲁棒性是重点由它错误控制技术进行评估的,我们称错误评估技术为FMO.我们调查研究了FMO作为一种H.264的误差控制技术是如何在一个容易产生错误的网络中对于传输误差和包丢失进行最好的处理.一种新的使用MBAmap将宏块映射到条带组的方法已经采用,这种方法可以帮助在解码中进行误差隐蔽技术并且提高了被接收视频的主客观性能.     

关于FMO分离模式下H.264/AVC视频传输误差控制的研究(英文)

H.264/AVC视频压缩标准对信道错误的鲁棒性是重点由它错误控制技术进行评估的,我们称错误评估技术为FMO。我们调查研究了FMO作为一种H.264的误差控制技术是如何在一个容易产生错误的网络中对于传输误差和包丢失进行最好的处理。一种新的使用MBAmap将宏块映射到条带组的方法已经采用,这种方法可以帮助在解码中进行误差隐蔽技术并且提高了被接收视频的主客观性能。     

Timing is money: managing the floor in sales interaction at street-market stalls

Abstract

This article considers ‘pricing’, that is, offers and requests for the price of sales items, as a communicative practice deployed by vendors and customers during sales interaction on street markets. It examines the organisation of sales interaction by pursuing the question of how and when market participants, vendors and customers alike, embed offers and requests for price information within their interaction. The analysis suggests that pricing is deployed as a technique to manage the ‘floor’ and the interaction at the stall. For example, offers for items are being tailored to customers’ display of interest and commitment to particular items, and requests for price information are deployed in ways that challenge anticipated offers, that is, offers that are about to be made by a vendor. The data, field observation and video-recording have been gathered at market stalls in London and Berlin.     

Enhancing farmers’ capacity for botanical pesticide innovation through video-mediated learning in Bangladesh

Despite the general success of farmer-capacity-building methods such as Farmer Field School in promoting pest management innovations, only those farmers directly involved benefit. How can agricultural extension enable farmer-to-farmer learning about botanical pesticides beyond such schools? We wanted to know how different learning methods, such as video shows and workshops, change farmers’ knowledge, attitudes and practices about botanical pesticides. This paper explains how video engages men and women farmers in spreading botanical pesticides across 12 villages in Bogra District, north-western Bangladesh. We conducted ex ante and ex post surveys among farmers from November 2009 to September 2010. For data analysis, we used t-test and McNemer and Wilcoxon sign rank tests. Our findings suggest that video improves the ability of both male and female farmers to communicate about pest management among themselves and with other stakeholders, as ‘intricate ethno-agricultural practices’. Video-mediated learning sessions are more effective than conventional workshop training in enhancing farmers’ knowledge about botanical pesticides, changing their attitude and finally taking a decision to adopt these methods. In other words, video is capable of communicating complex issues such as the biological and physical processes that underlie pest management innovations. From our case, we conclude that agricultural extension is more effective with the use of facilitated video learning and that this process clarifies complex agro-ecological principles, bias and normative perceptions of the learners. Also, video-mediated learning is not only transferable across villages, but also works well in combination with other media, such as radio, television and mobile phones.