数据缓冲区

A pointer to the buffer that contains data to be written in the address space of the specified process.

指向的缓冲区中包含的数据来写的地址空间指定的进程。

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。

3Web service is a hotspot in WebGIS study recently. Based on Web service and OGC specifications, a WebGIS system for Web service is designed. A webGIS antetype and a group of WebGIS compenents including geographic entity attribute data query, distance measure, frame choosing, contour, GML disposal and buffer analyzing ect are developed. The combination of WebGIS and service platform in application are more practical and can improve the function of the platform extremely.

3Web服务是当前WebGIS研究的重点问题，在遵循OGC规范和Web服务规范的基础上，设计了基于Web服务的WebGIS体系结构，并开发了WebGIS系统原型及地理实体属性数据查询、测量距离、框选、等值线、GML处理和缓冲区分析等扩展WebGIS组件；为实际应用，考虑了将开发的WebGIS和服务平台的紧密结合，以便丰富服务平台的功能。

Also the starting delay and buffer at the receiver can be minimized since there is no need to rearrange the packets.

同时由于不需要对收到的数据包重新排序，接收端的启动延时与缓冲区需求得以有效减小。

A buffer stores data that is about to be used or that has just been used.

缓冲区存储了已经用过的或者是还未使用的数据。

In other types of applications, overflow of the Circular Buffer and attendant data loss is acceptable.

在其他类型的应用程序的通知和损失随之而来的缓冲区溢出数据是可以接受的。

With every overlapped send or receive operation, it is possible that the data buffer submitted will be locked.

每一次重复发送或接收操作，可能是缓冲区的数据提交将被锁定。

It monitors the buffer data for presence of any four or more consecutive repetitions of the same character.

监察缓冲区的数据存在任何4个或更多的连续重复同一性质的。

The buffer descriptor block may store both a source address and a destination address indicating where the data is to be retrieved and stored.

所述缓冲区描述符块可以同时存储指出从何处取回数据以及将数据存储到何处的源地址和目的地址。

The DMA controller may read a data structure, referred to as a 'buffer descriptor block,' to perform the data transfer.

所述DMA控制器可以读取一个称为&缓冲区描述符块&的数据结构以便执行所述数据传送。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷