共查询到20条相似文献,搜索用时 487 毫秒
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说明了网络处理器出现的背景,阐述了网络处理器的体系结构.详细介绍了网络处理器的功能技术特点和产品现状,探讨了网络处理器的各种实际应用.指出了网络处理器设计面临的问题和挑战. 相似文献
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Uman M.A. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1988,76(12):1548-1565
Present understanding of both natural and artificially initiated lightning is first reviewed. The ways in which lightning can cause damage, the methods that are used to provide protection from that damage, and the test standards that are used to assess the immunity of systems from lightning damage are then examined. Finally, deficiencies in present approaches to lightning protection are pointed out and recommendations for the amelioration of those deficiencies are given 相似文献
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通过具体实例详细地介绍了构建和设计光传输网络的两种方法及其过程,而且对每种方法都作出了多种设计方案。经过对两种方法及其不同方案的分析与比较,指出了各自的优缺点,希望能给网络工程设计人员在实际构建和设计光网络时提供一些帮助和参考。 相似文献
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阐述和比较了I-DEAS与UG的三维建模方法,提出了两者数据转换时需引起注意的问题,给出了具体的转换步骤。 相似文献
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Lian Bing 《电子科学学刊(英文版)》1998,15(1):76-83
The recursive structure and quasi-recursive structure of Adaptive Volterra Fil-ter(AVF) are put forward, their algorithms are given, and their characteristics and applications are discussed. The introduction of recursive structure can remarkably reduce the parameters and computational cost of AVF. 相似文献
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Balestra Francis 《半导体学报》2006,27(4):573-582
提供了一种用于安德鲁反射测量样品制备新方法. 该方法采用聚焦粒子束刻蚀和磁控溅射,可以获得可控的、干净的、无应力的纳米接触用于自旋极化探测. 所制备的样品中,磁性和非磁性材料样品的反射谱都表现出复杂的峰和谷结构,这些结构可能源于与界面相关的零偏压反常以及与激发态相关的准离子相互作用. 对另一个Co40Fe40B20合金样品采用简单的钕针尖压针方法进行了对比性测量,反射谱中没有观察到谷结构,但谱结构出现较明显的热扩展,这种热扩展可能来源于界面处的非弹性输运. 所有的反射谱目前还不能由现有的理论给出令人满意的解释. 利用点接触反射方法获得可靠的自旋极化信息还有赖于接触界面特征的进一步分析. 而一个更切合实际的、更完善的理论成为迫切的需要. 相似文献
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概述了防火墙技术的发展现状,从因特网(Internet)安全角度分析了各种防火墙技术的优点和缺陷,对于防火墙设计中的一些问题提出了解决方法。 相似文献
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Russ Dewitt Jay Ramasastry Kap Kim Peter Li 《International Journal of Satellite Communications and Networking》1991,9(5):305-311
Two major ISDN applications which will undoubtedly affect world-wide telecommunications in the coming decade are discussed. They are: (1) video transmission and (2) image transmission. Brief reviews of videophone chronicle and the current video coding technologies are presented. The application of videophones using p × 64 (CCITT coding algorithm up to 1·5 Mb/s) and the DCT (discrete cosine transform) algorithm for narrowband ISDN are discussed. Broadcast TV quality DS3-45 MB/s video codecs are also briefly discussed as a probable videophone system in the broadband ISDN era. The explosive growth of facsimile services is reviewed, and the progress of image coding technologies and their standards are covered. The prospects of high resolution image transfer systems with ISDN are addressed. 相似文献