IP网络性能测试研究

本对IP网络性能测试及其主要的性能指标进行了研究，提出了一种可实用的端到端测试的方法，并详述了此方法的使用。     

IP承载网络性能测试技术

对目前IP承载网性能测试技术和性能测试指标进行了简单介绍,着重分析了在基于设备网管的网络性能测试的缺点,并对基于端到端的对网络性能分析和分布式网络性能特点进行了说明。     

IP网络安全与设备测试

介绍了IP网络目前所面临的安全威胁,并讨论了路由器设备安全功能的测试。     

IP网络设备的性能测试

IP承载网应用业务的增多，网络规模的扩大、组网设备的繁多，使得IP网络设备的性能越来越受到设备制造商、网络运营商的关注与认可，本文着重对应用层次的网络互联设备、应用管理设备的性能测试指标、测试实施流程、测试关注要素进行了阐述，     

IP网络分组传送性能讲座 第1讲:IP网络性能参考模型

随着IP技术的发展,其应用领域不断扩大.现有的IP网络能够较好地支持非实时数据业务,为r使它也能够支持各种实时业务与多媒体业务,就必须研究和规范IP网络传送信息的性能.本讲座在研究和分析ITU-T关于IP网络性能的标准和实际解决工程技术问题的基础上,讨论和介绍了IP网络性能方面的有关内容.其中包括:IP业务性能描述的参考模型、IP业务性能测试的环境与条件、IP业务的性能参数、IP业务的可用性等.     

IP网络设备高级性能测试方法

介绍了IP网络设备基本性能测试的相关标准,阐述了相关设备的高级测试技术,并且对高密度、低时延的10G以太网测试方法进行了分析,总结了IXIA在上述领域的优势与特点。     

信息工程的IP网络安全测试

描述了IP网络目前所面临的安全威胁,并介绍了信息工程验收过程中如何对路由器设备安全功能的测试.     

IP网络的性能分析

本提出了IP网络性能的主要评价指标，论述了IP网络性能的技术本质及其对用户使用的影响，并通过实例说明了IP网络性能的具体分析办法。     

宽带IP网络的主流

本重点介绍宽带业务主要接入方式及适用范围以及各自的特点。     

IP网络移动电话技术介绍

IP网络移动电话技术是当前IP技术的一个热点。本文跟踪了该技术的最新发展。构建IP电话体系结构的标准有两种:H.323协议和SIP。本文首先介绍了H.323协议的移动性支持,然后介绍了SIP的移动性支持,最后对两种协议的移动性支持做了总结。     

基于模糊化输入和反转提高神经网络分类性能的方法

为有效提高神经网络的分类性能,首先提出了一个可处理模糊输入的模糊神经网络结构,然后由模糊输出和非模糊目标输出定义了代价函数,推导出相应的学习算法,并对该模糊神经网络进行反转,提出了模糊化的反转算法．最后,通过计算机仿真实际的模式分类问题,验证了所提出的方法的有效性．实验结果表明,所提出的方法具有学习效率高、分类准确率高、泛化能力高的优点．     

美国防部开发IP卫星通信网络管理系统

最近,美国防部制定了联合IP调制解调器（JIPM）标准,以规范中枢向外辐射拓扑IP卫星通信网络中的甚小孔径终端（VSAT）调制解调器。联合IP调制解调器将提供一种替代方案,以取代目前正在部署的、可满足现行作战需求并可以支持＂持久自由＂和＂伊拉克自由＂军事行动中作战人     

基于HTTP的网络服务性能建模与分析

该文将服务器系统和通信访问网络考虑为一个整体建模,给出了一个基于HTTP的Web系统的服务性能模型,并将模型扩展到了多服务器系统;分析了各模型参数对网络服务性能的影响,提出了避免死锁状态的方法和增加服务器的速率原则;最后对比了几种提高服务性能的方法.仿真结果证实了模型的有效性.     

目标边缘增强对神经网络性能的改进

对有限灰阶的增量算法进行了进一步的研究和改进，提出用边缘增加的训练样本代替普通样本模式进行互连权重的学习。通过对边缘增强的４种飞行器平面内旋转投影图识别，证明此方法可使神经网络互连权重的灰阶数目进下降低，从而更易于光学硬件实现。     

IP switching-ATM under IP

Internet protocol (IP) traffic on the Internet and private enterprise networks has been growing exponentially for some time. This growth is beginning to stress the traditional processor-based design of current-day routers. Switching technology offers much higher aggregate bandwidth, but presently only offers a layer-2 bridging solution. Various proposals are under way to support IP routing over an asynchronous transfer mode (ATM) network. However, these proposals hide the real network topology from the IP layer by treating the data-link layer as a large opaque network cloud. We argue that this leads to complexity, inefficiency, and duplication of functionality in the resulting network. We propose an alternative in which we discard the end-to-end ATM connection and integrate fast ATM hardware directly with IP, preserving the connectionless nature of IP. We use the soft-state in the ATM hardware to cache the IP forwarding decision. This enables further traffic on the same IP flow to be switched by the ATM hardware rather than forwarded by IP software. We claim that this approach combines the simplicity, scalability, and robustness of IP, with the speed, capacity, and multiservice traffic capabilities of ATM     

PERFORMANCE ANALYSIS OF HETEROGENEOUS TRAFFIC ON AN INTEGRATED NETWORK LINK WITH FINITE WAITING ROOM AND ANTICIPATED-RELEASE RESERVATION POLICY

We consider a system where the superposition of two heterogeneous Poisson traffic streams is offered to an integrated network link in synchronous transfer mode, where one stream follows the blocked-and-cleared mode (‘loss’ mode) and the other can wait (finitely) if bandwidth is not available for connection at the time of arrival (‘hold’ mode). We assume that each stream has different bandwidth requirements per call. A reservation scheme, called anticipated-release policy, is introduced where an arrival is accepted into a waiting room only if the amount of time this customer is expected to wait is within acceptable limits. For such a loss/hold system, we provide analytical performance models for exponential service time distributions for both streams as well as for the non-exponential service time distribution case for the traffic stream in ‘hold’ mode. We also present a method on how to model the waiting time distribution of the traffic stream with ‘hold’ mode. From numerical studies, we observe that blocking can be reduced considerably for both services just by introducing a small waiting room for one traffic class compared to ‘loss’ mode for both traffic classes. Furthermore, this holds true for the case when a maximum tolerable time limit is imposed on the waiting. Finally, our results indicate that this loss/hold scenario with limited waiting room appears to be virtually insensitive to the service time distribution of the ‘hold’ mode traffic.     

移动IP与蜂窝IP技术

人们对以无线方式接入Internet的需求日益增长。首先介绍了移动IP（Mobile IP）的基本原理，并指出其在支持微移动性方面的不足。然后详细介绍和分析了蜂窝IP（Cellular IP）的概念及路由、寻呼和切换等关键技术。最后根据这两种技术的互补性，提出二者进行无缝结合的方案，并认为这种结合将成为未来移动互联技术的发展方向之一。     

IP switching for scalable IP services

Internet protocol (IP) switching is emerging as a critical technology for improving the speed and scalability of the Internet. This paper discusses IP Navigator, a form of IP switching developed specifically for use in core network backbones, such as Internet service provider networks and major corporate backbones. IP Navigator combines the high speed and quality of service capabilities of asynchronous transfer mode (ATM) with the scalability and flexibility of IP. This paper presents an overview of the techniques that have been developed for operating IP over ATM. We outline the IP Navigator design and compare IP Navigator with other IP switching approaches     

移动IP与蜂窝IP的结合

文章介绍了一种将移动IP与蜂窝IP相结合（MIP-CIP）的系统，用仿真的方法分析了移动节点在CIP网络内部移动和网络间移动时的服务质量（QoS）性能指标，提出并比较了MIP-CIP应用的2种方案。