Unequal Forced-Intra-Refresh for robust video streaming

INTRODUCTION In the encoding or transcoding of video stream- ing, intra refresh is introduced as a non-normative error-resilience tool. Although the intra-refresh schemes based on the rate-distortion optimization (C?té et al., 2000; Stockhammer et al., 2002) are superior to the early heuristic intra-refresh strategies, these new schemes cannot yet accurately estimate the video distortion due to time-varying packet losses, and usually ignore the inter-frame error-propagation effect. Chiou…     

数字视频教学资源实用标准的应用与实践

为解决精品课程教学录像标准的应用问题,文章分析了当今主流视频编码标准以及应用实例,并据此总结出视频应用的特点与规律。在此基础上,阐述对于新技术环境下教学视频应用标准架构基本原则,即多种编码方式共存、优选通用编码方式、兼顾互操作性并考虑应用的可持续性。提出了基于应用域与应用阶段的教学视频实用标准(参考)方案。并就该方案应用于教学实践中的成功经验和面临的具体问题进行了讨论。     

E-government: What can China learn from Europe?

This article compares China with European Union （EU） in e-government readiness and e-participation. The research shows that China has made remarkable progress in recent years. Nevertheless, EU is still leading in the e-government development. Then based on the further analysis of the e-government implementation experiences in EU, we propose some suggestions for the future development of e-government in China.