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TCP/IP的网络体系结构和协议机制张国清Internet遵循TCP/IP的网络体系结构和协议机制。本文着重介绍TCP/IP的网络体系结构和特点、协议集功能及其协议机制。一、TCP/IP的形成与发展1969年美国国防部高级研究计划署(DefenceA... 相似文献
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Internet协议的最新发展邮电部数据通信技术研究所史习军,陈锦章一、TCP/IP与ISO/OSITCP/IP源于六、七十年代的ARPANET,并于1977~1979年之间制定出TCP/IP体系结构和协议标准。20年来,基于TCP/IP的Inter... 相似文献
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网络协议系列文章[3]网间网(TCP/IP)的地址管理周伟安TCP/IP(TransmissionControlprotocol/Internetprotocol)是传输控制协议和网间互连协议,这也是通常把使用TCP/IP协议连结起来的网络称为网间网... 相似文献
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TCP/IP传输层协议(传输层之二)周伟安TCP/IP的传输层有TCP和UDP(UserDatagramProtocol)两个传输协议。UDP与TCP都是由进程启动,所以它们都要为IP层传输提供一个进程端口。此外它们都要依赖IP层和对方的传输层进行通... 相似文献
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本文对上前使用广泛的数字通信协议TCP/IP进行了全面的的介绍,并对TCP/IP协议的构成、主要功能及物理介质与应用程序之间关系作了详细介绍,对我们全面了解和运用TCP/IP协议很有用处。 相似文献
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TCP/IP地址结构●单华范捃妮一、TCP/IP概述TCP/IP是多台相同或不同类型的计算机进行信息交换的一组通信协议。它是在70年代末、80年代初发展起来的。其层次结构如下所示。应用层主机—主机通信层网络接口层最低层是网络接口层(IP),它位于提供... 相似文献
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简单论述了TCP/IP协议和QNX实时操作系统,详细介绍了在QNX上采用TCP/IP协议进行以太网中的编程方法及性能测试。 相似文献
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文章介绍了国际标准组织中下一代网络(NGN)体系结构的最新研究进展,探讨了下一代网络可能的演进路线:从软交换到因特网协议(IP)多媒体子系统(IMS),即网络走向融合的道路。文章着重介绍了IMS的结构和功能实体。 相似文献
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为贯彻"因材施教"的原则,一些有条件的二本高校可以对计算机专业学生进行分类教学的探索实验。二本高校计算机专业的分类教学即可满足计算机学生的切身需求,又可为社会培养多种类型的IT人才。为增强二本高校计算机专业的竞争力、吸引力,一些有条件的二本高校应该做一些计算机专业的分类教学实验。 相似文献
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《Microwave Theory and Techniques》1987,35(1):35-40
Considering the numerical optimization approach for the inversion of the Schwarz-Christoffel conformal transformation formula, some improvements in integration procedures and some topics in optimization methods are discussed. Predictor-corrector techniques are introduced in order to map internal lines after the polygonal boundary is transformed these are applied to the dielectric interface in inhomogeneous line cross sections, allowing conformal transformation of quasi-TEM structures by purely numerical methods. Some examples of computations are presented, and some results are compared to known analytical calculations. 相似文献
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《IEEE instrumentation & measurement magazine》2009,12(1):4-4
I am writing this in mid-August during my annual summer visit to my parents in New York. In an attempt to absorb some culture and to expose my children to some culture, my family and I have been visiting some of the museums on the eastern seaboard. Yesterday, we went to the Metropolitan Museum of Art in Manhattan. It was the fi rst time my daughters, ages six and ten, had been there. They got a real kick out of some of the exhibits (though they wanted to go home long before their mom did). 相似文献
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文章针对红旗地区配电网配电网结构不合理;部分供电设备陈旧老化;配电变压器的负荷不平衡;无功补偿不足等问题,从技术方面提出了有效降低损耗的措施. 相似文献
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This paper presents a comprehensive review of the ARPANET routing algorithm, from its original implementation to our plans for future modifications. We hope that by collecting this information, and by providing considerable details, we can provide others with a useful reference document concerning some of the practical problems of network algorithm design. Much of the discussion below assumes a basic familiarity with the principles of packet switching, the ARPANET implementation, and some of the relevant terminology, information which can be found, for example, in [4]. Sections 1 and 2 give a brief summary of basic routing concepts and of the original routing algorithm, respectively. The following two sections describe in detail subsequent modifications and the actual implementation currently in use. Section 5 then discusses some problems that have developed over the past few years, as network usage has grown considerably. The final sections outline some explanations for these problems and some mechanisms for improving performance. We are in the process of implementing these and other changes to the routing algorithm. 相似文献
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通过对全国5大城市问卷抽样调查数据的定量分析,并结合天津华章里社区的典型个案研究,探讨现有的社区服务体系面临的挑战,围绕社会交往、社区活动、社区选举、社区管理、社区服务5个方面,检视我国现阶段农民工社区融入面临的问题及其原因,发现社区融入的现实路径,提出完善农民工的社区服务、促进社会融入的政策意义。 相似文献