通信网络

Focusing on three key issues of the efficiency of video transmission, reliability and friendship on nets, the paper conducts a deep analysis of the enhancement of the compression of video-coding layer based on H.264, the optimized assembly of the net matching layer and the ability to correct errors of the decoder and encoder. Take the package switch of IP Video information package as an example, the thesis focuses on the reflection process of the Internet RPT/UDP/IP acted on by H.264, illustrates the typica...

围绕视频传输要求高效、可靠和网络友好的三个焦点问题，深入研究H 。2 6 4标准编码层压缩性能的提升、网络适配层的无缝集成和编/解码器的容错性能；以基于包交换的IP视频信息包为例，重点分析H 。2 6 4对因特网RTP/UDP/IP协议的映射过程；阐述H 。2 6 4在视频移动通信、视频流服务、数字电视广播与存储领域的典型应用特点；指出H 。2 6 4对视频源压缩、信道有效利用、缓解视频传输瓶颈的影响和发展前景。

The wireless sensor network has attracted great attention of the world, and is an emerging researching area with multi-discipline interleaving. It intergrates sensor technology, embedded computation technology, network and wireless communication technology, distributed information processing In real time, It detects, apperceives and collects the information of various enviroments or objects with the collaboration of kinds of IC sensors.

无线传感器网络是当今国内外备受关注的、由多学科高度交叉的新兴前沿研究领域，它综合了传感器技术、嵌入式计算技术、现代网络及无线通信技术、分布式信息处理技术等，能够通过各类集成化的微型传感器协作，实时监测、感知和采集各种环境或监测对象的信息。

Wireless Sensor Network is a short-range wirless network, which consistes of densly deployed large number of sensor nodes with different specifications and functions. All sensor nodes have the abilities of apperceiving, computing and communication, which form a network through ad-hoc mode.

无线传感器网络(Wireless Sensor Network，WSN)是由大量分布的不同规格和功能的具有感知、计算和通信能力的微型传感器节点通过自组织的方式构成的一个小范围的无线网络。

The network system demodulates received bursts that are communicated between the two mobile terminals to determine whether a received burst contains control information intended for the network system.

网络系统对接收到的在两个移动终端之间通信的数据包进行解调，以确定接收到的包是否包含欲用于网络系统的控制信息。

The virtual subsistence of undergraduates is the behavior that the group of undergraduates do some- thing like learning,working,disporting and so on by taking advantage of modern electronic communication, net information and resources, under the state of physical body in absence, in the digital condition of bit in unit.

大学生虚拟生存是大学生群体在物理身体不在场状态下，在以比特为单位的数字化环境中，凭借现代电子通信、网络技术等手段，利用网络信息资源开展学习、工作、娱乐等一系列活动的行为。

IEEE802.15.4 is a new standard uniquely designed for low rate wireless personal area networks.It targets low data rate,low power consumption and low cost wireless networking.The energy-efficiency and robustness of this new standard makes it a strong candidate to be a federating communication protocol for wireless sensor networks.

IEEE802.15.4作为一种专为低速率无线个人区域网络(low data rate-wireless personal areanetwork，LR-WPAN)而设计的低成本、低功耗的短距离无线通信新标准，为无线传感器网络提供了一种很好的解决方案。

The fluctuation of available wireless link bandwidth motivates the study of adaptive multimedia services in wireless/mobile networks This paper focusses on a bandwidth adaptation scheme, which takes the maximum revenue as the objective The optimal bandwidth adaptation algorithm which seeks to achieve maximum revenue is an NP hard problem, because it has to investigate every adaptation case A bandwidth adaptation scheme based on genetic algorithm is proposed, which achieves near optimal total revenue with much less complexity compared to an optimal bandwidth adaptation algorithm Simulation is carried out to compare the algorithm with an optimal bandwidth adaptation algorithm, the results reveal that the genetic algorithm approximates the optimal solution very well

无线链路带宽的快速波动推动了无线/移动网络中对适应的多媒体服务的研究以无线网络系统的利润最大化为目标，研究适应的多媒体应用的带宽适应方案达到利润最大化的最优带宽适应算法是一个NP hard问题提出一个基于遗传算法的带宽适应方案，在算法复杂度大大低于最优算法的同时，获得的利润值近似最优性能分析和实验结果证明了这一结论1 引言因特网和无线/移动通信技术的迅速发展，推动了两者服务的融合无线/移动环境下因特网服务的提供需要解决的一个关键问题是QoS保证提供QoS保证的一个重要技术手段是连接接纳控制 [1] CAC算法的目标是在保证切换连接请求丢弃率满足系

The carriers have been the Godfathers of these wireless networks, explains Tim Wu, a professor at Columbia Law School.

这激怒了通信公司，无线互联网业务持续增长，它们想要保持对无线互联网的控制权，&这些无线网络由网络承载商说了算&，哥伦比亚法律学院的教授 Tim Wu 解释道。

In addition, the fleet network outspreading, especially in recent years, make it possible that information data could be transmitted more economically and reliably.

同时，由于网络的快速扩张，尤其近几年的高速度增长，使得数据信息可以更经济和可靠的传输，网络通信已经成为商家赖以生存的基础，嵌入式系统也越来越追求网络化。

Key words: network security; Peer-to-Peer networks; anonymous communication; rerouting

关 键 词：网络安全；P2P网络；匿名通信；重路由

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。