A Novel End-to-End Architecture for H.264 Video Streaming over the Internet

In this paper we propose a novel end-to-end architecture for H.264 unicast video streaming over the Internet. The proposed video streaming architecture is based primarily on a new transport layer protocol, the stream control transmission protocol (SCTP). We show that the network-friendly specification of H.264, and the novel technical characteristics of SCTP, when coupled together are able to provide a highly adaptive and flexible system for unicast video streaming. More specifically, we develop algorithms that handle at the transport layer the following functions concerning video packet transmission: retransmission policy, packet prioritization, implicit receiver feedback. We combine the above algorithms with an R-D optimization strategy at the encoder, that provides more options when adapting to bandwidth variations. This combined optimization strategy leads to more options concerning the streaming parameters. Finally, with simulation results we prove that our system is capable of maintaining good perceptual quality and TCP-friendliness under various loss conditions. An early version of this paper appeared in CCNC 2004.     

Comparing the streaming of FGS encoded video at different aggregation levels: frame,GoP, and scene

Fine granularity scalability (FGS), a new coding technique that has recently been added to the MPEG‐4 video coding standard, allows for the flexible scaling of each individual video frame at very fine granularity. This flexibility makes FGS video very well suited for rate‐distortion optimized streaming mechanisms, which minimize the distortion (i.e. maximize the quality) of the streamed video by transmitting the optimal number of bits for each individual frame. The per‐frame optimization of the transmission schedule, however, puts a significant computational burden on video servers and intermediate streaming gateways. In this paper we investigate the rate‐distortion optimized streaming at different video frame aggregation levels. We find that compared to the optimization for each individual video frame, optimization at the level of video scenes reduces the computational effort dramatically, while reducing the video quality only very slightly. Copyright © 2005 John Wiley & Sons, Ltd.     

面向对象程序设计课程教学改革的研究与实践

从面向对象教学面临的困境入手,结合学生的学习心理和认知规律,分析了产生问题的主客观原因,提出了"先过程,后对象"的教学理念,从教材建设、教学内容安排上阐述了教学内容的具体组织实施过程;从教学思路、教学观念、教学手段几方面探讨了教学方法的改革。     

流式音频及RealSystem系统

概括阐述了以边下载边播放的形式在网上传输多媒体信息的新技术-流式媒体技术，并着重介绍三大解决方案中目前较具优势的方案-RealSystem系统。     

基于Internet的流媒体技术

基于Interent的流媒体技术是目前IP宽带业务的核心内容和关键技术，阐述了有关流媒体技术的定义，文件格式，实现途径和过程，系统组成及相关协议，分析了流媒体技术的发展趋势。     

网络流媒体传输中的自适应技术

如何在现有网络条件下进行多媒体音视频数据的有效传输控制是目前网络技术发展的一个热点。现在较多地采用流媒体技术来解决网络多媒体传输和播放的实时性需求，而自适应流媒体技术则是在不稳定的网络条件下进行数据传输有效控制的一种新技术。     

基于Visual Foxpro的通用试题库管理系统研究

研究开发通用试题库管理系统对推动教学改革有着积极的促进作用。在此主要探讨利用Visual Foxpro软件如何进行通用试题库管理系统研究开发的问题。首先根据实际需要提出通用试题库应用系统的数据库表结构的设计及主要功能设计,主要功能模块包括基础信息管理、题库管理、试卷生成、试卷管理及系统帮助5大模块。最后对核心部分的题库管理与组卷策略方面提出自己的设计思想及其实现方法。     

An SSD‐Based Storage System for an Interactive Media Server Using Video Frame Grouping

For real‐time interactive multimedia operations, such as video uploading, video play, fast‐forward, and fast‐rewind, solid state disk (SSD)‐based storage systems for video streaming servers are becoming more important. Random access rates in storage systems increase significantly with the number of users; it is thus difficult to simultaneously serve many users with HDD‐based storage systems, which have low random access performance. Because there is no mechanical operation in NAND flash‐based SSDs, they outperform HDDs in terms of flexible random access operation. In addition, due to the multichannel architecture of SSDs, they perform similarly to HDDs in terms of sequential access. In this paper, we propose a new SSD‐based storage system for interactive media servers. Based on the proposed method, it is possible to maximize the channel utilization of the SSD's multichannel architecture. Accordingly, we can improve the performance of SSD‐based storage systems for interactive media operations.     

基于Web服务的大学英语移动学习系统的设计与实现

随着计算机与通信技术的发展,以及智能手机的发展,给移动学习系统的普及和发展带来了机遇。本文基于Windows2003 Server系统,以Tomcat＋Eclipse＋SQL Server2005＋JDK”作为开发环境,设计一款针对大学生的大学英语移动学习平台,使大学英语学习充分利用现代科学技术的发展,具有一定的实用性。     

基于Web的IPTV实验平台系统设计

阐述了基于Web的IPTV系统的整体架构,说明了系统设计的基本思路,通过3部分展示了以Windows Media Server作为流媒体服务器,具有视频点播和直播功能的IPTV实验平台系统的搭建过程。用户通过的计算机终端连接系统,不仅实现了电视节目直播、视频点播,还可作为各种学术报告、大型活动现场直播的平台,具有较高的实用价值。