传输网络

With the accelerative growth of digital technology and network technology in broadcasting field, network transmitting technology and exchange technology attracts more and more attention.

随着广播业数字化、网络化发展步伐的加快，音频网络传输和交换技术代表了未来音频传输和交换的发展方向。

Firstly, the thesis introduced the development of VOD, the background and meaning of the program, then the author introduced the associated technology, mainly including the feature of multimedia, video compression technology and the protocols SCTP and RTP. Considering the ambulant of host , fluctuation of bandwidth,high error rate data in wireless networks ,the author proposed some QoS strategy in the wireless networks such as RTP/SCTP protocol stack , connection control of the server, two buffers in the client end point.,TFC congestion control algorithms ,etc. Based these strategies, the team members gives the software and hardware solution of the wireless video-on-demand system and gives the main modules design of the software system. The system adopted the C/S structure including two parts: server and client ,using the Mpeg-2 which is apporiate for networks as the supported format. The thesis emphatically researches on the video-serving module of the server and the sink module, player module of client.

本文首先介绍了视频点播系统的发展现状、课题的研究背景和意义；接着对课题的相关技术进行概述主要包括了多媒体特点，压缩技术，传输协议SCTP以及RTP；针对无线环境的节点移动性，带宽波动性，数据错误率高等三大特点，作者研究设计了无线环境下的QoS策略：RTP/SCTP协议栈，服务器准入控制机制，客户端双缓冲区，TFRC拥塞控制机制等；在这些策略的基础上设计了系统的软硬件解决方案，并对软件体系结构的主要模块进行了设计，整个视频点播系统采用C/S结构，由服务器，客户端2个部分组成，使用适合网络传输的流媒体格式Mpeg-2作为系统支持的格式，文中重点研究了服务器的视频服务模块以及客户端的接收模块和播放器模块，并利用线程池技术对系统进行实现。

Digital audio - Digital input-output interfacing - Transmission of digital audio over asynchronous transfer mode networks

数字音频。数字输入输出接口。异步传输模式网络上的数字音频传输

Three-level buffer and asynchronous transmission mechanism are designed by ourselves independently, thus the I/O and web transmission of data can be reduced greatly.

独立设计了三级缓存与异步传输机制，很大程度上减少了数据的I/O和网络传输。

Improve pixel camera, the digital interpolation to increase ordinary resolution would be tantamount to fraud, in the definition and image quality without any improvement; On the other hand to improve the image quality and resolution, the amount of data is bound to geometry class increase the number of not only USB protocol can not keep up the speed of data transmission, data transmission networks also can not keep up.

摄像头提高像素的话，一般通过数字插值提高分辨率，这就等于弄虚作假，在清晰度和图像质量方面没有任何改进；另一方面若要提高图像质量，提高分辨率，数据量就必然几何级数地增加，不但USB协议的数据传输速度跟不上，网络数据的传输更跟不上。

The optical fiber transmission techniques have been applied to a wired television transmission network, and replacing the long—distance cable backbone, and application of the co-axial cable advantages as of the transmission medium has formed a concept of Hybrid Fiber Coaxof the branch and going to-some place by distribution.

光传输技术在有线电视传输网网络的应用，取代了长距离的电缆干线，而利用同轴电缆的优点作为支线及分配入户的传输媒质形成了HFC的概念，即光纤电缆混合网。

Place state of mind, we do a website, it is for gain only not merely, of World-Wide-Web appear, very big the meaning of one part is for the convenience that the message transmits, is not for gain, admittedly these course network got year of a lot of people the first pail of gold, but you need network cost, he just can repay you more value, the information natural resources that is Internet does a business, do not consider to collect merely, the resource demand of the network our complement, is not mutual between purloin embezzles, of course, we also were not necessary one day sufficient N piece achieve formerly, have the content of extremely high value, of our demand is quality, is not an amount.

摆正心态，我们做网站，不只仅是为了赢利，万维网的呈现，很大一部分的意义是为了消息传输的方便，而不是为了赢利，固然这些年很多人经过网络获取了第一桶金，但是你必需给网络代价，他才可以报答给你更多的价值，为互联网的消息资源做一件事情，不要仅仅去考虑采集，网络的资源需求我们的补充，而不是互相之间盗取盗用，当然，我们也没有必要一天充分N篇原创的，具有极高价值的内容，我们需求的是质量，而不是数量。

The paper analyses the application mode development and demand of electric power communication transmission network ,and introduces ECI BG-40 which inosculates MSTP and PCM,and discusses a new type of application mode of electric power communication transmission layer network,which inosculates MSTP and PCM and offers reference for construction of el.

文章在分析了电力通信传输网应用模式发展及需求的基础上，对ECI公司最新推出的集MSTP+PCM功能于一体的BG-40产品进行了介绍，探讨电力通信传输网一种新型的网络应用模式，这种PCM+SDH的网络融合的组网新模式，将为电力通信网传输层网络的组网提供很好的参考。

The network communication is applied in vehicle detect system which is one of the most important parts in orbit traffic. The working information of the vehicles can be detected and transmitted to the vehicle control system on the floor through the vehicle detect system. The realization of network communication is introduced into the vehicle detect system, and the mechanism of network communication is transplanted to the embed system based on Reworks.

主要介绍了轨道交通车况检测系统中网络通信技术的应用，车况检测系统是轨道交通系统的重要组成部分，通过车况检测系统可以实时采集列车的车辆工况监控信息并将它及时传输给地面的车辆工况监控系统，本文阐述了在车况检测系统中网络通信的实现方法，并给出了基于Reworks嵌入式系统下的网络通信机制。

In the thesis, the author discussed new problems appeared in the realm of protection of the copyright in the internet, such as the protection of obligees' economic rights and their mental rights, related technical measures, and the legal protection of rights management information etc.

论文共分三章。第一章论述了作品数字化的归属、网络传输中的暂时复制、如何使网络传播权成为版权人的专有权、网上精神权利的保护及技术措施和权利管理信息的法律保护等在网络环境下出现的新问题。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。