宽带家庭网关向下一代互联网过渡部署探讨

随着IPv4公网地址的耗尽,IPv4向IPv6过渡已成为必经之路,宽带家庭网关设备向IPv6过渡是实现IP城域网由IPv4向IPv6演进的基础,也是IPv6实施部署的关键一环。通过目前互联网下一代互联网技术的发展状况,提出宽带家庭网关向IPv6过渡和演进方案,介绍公网双栈、私网双栈（NAT444）和轻型双栈（Ds-lite）过渡方案的技术原理,以及针对这三种方案的部署和实施的关键问题进行对比分析。     

数据中心防火墙防护部署

防火墙的安装与部署是数据中心网络安全策略中的关键一环,顾名思义,防火墙就像一道安装在接入互联网的外部网络和数据中心内部网络的由硬件设施和管控软件组成的隔离墙,是一种协助确保网络信息安全的保护设备,主要由服务访问规则、验证工具、包过滤和应用网关等部分组成,所有经过防火墙的数据和信息都会被有针对性的筛选,使网域间建立起一个安全网关,保护内部网络免受非法用户的侵入。本文通过防火墙在数据中心边界防护的部署中对应不同应用策略进行了阐述。     

下一代互联网在湖南电信网络的试商用部署实践

本文介绍了在长株潭两型社会建设综合配套改革试验区部署下一代互联网技术的背景,并对下一代互联网技术在湖南的实践部署和应用情况进行了重点说明,阐述了中国电信湖南分公司在IPv6网络和业务方面的主要创新成果,并提出了深化下一代互联网研究实践的建议。     

双栈用户的PPPoE接入及网络部署

介绍IPv6环境下PPPoE接入控制的基本流程;针对家庭网关不同的工作模式,分析双栈用户在家庭网关桥接模式和路由模式下的接入流程;研究双栈环境下部署PPPoE接入控制方式对相关设备及系统的要求和网络部署方案。     

IPv6关键技术在网络中部署的研究

本文简要的分析了目前业界主流的各种IPv6技术,根据各种技术的特点和适用场景,并结合运营商网络情况,提出了运营商网络IPv6过渡时期的部署策略,并结合相关技术提出了对应的部署方案,希望能够为运营商网络IPv6化改造起到一定的借鉴作用。     

IPv4/IPv6过渡方案的研究与应用网络部署

为深入研究IPv6网络技术并全面部署应用网络,在探讨组建IPv6网络的基本原则和研究IPv6过渡技术的基础上,提出了相应的网络过渡策略.结合济南大学IPv6应用网的建设过程,对方案的可行性进行了充分论证,重点研究了地址分配方案和实现关键技术,并最终实现了全网部署.开展了IPv6网络环境下的一系列测试和应用建设.     

基于5G移动通信仿真平台的端到端双栈组网部署方法研究

为提高通信网络运行环境的稳定性,降低移动通信传输过程中的误包率,文章开展了对基于5G移动通信仿真平台的端到端双栈组网部署方法的研究。通过基于5G移动通信仿真平台的5G应用生态环境构建、网络架构配置、实现工业领域车路协同部署,提出一种全新的组网部署方法。并进行对比实验,结果表明,新的部署方法能够保证在通信过程中发包数量与返回包数量的一致,将误包率降低至0%,可以极大程度地提高通信网络环境的运行稳定性。     

因特网协议版本6技术在校园网中的应用

介绍了IPv6（因特网协议版本6）的特性以及常见的过渡技术：双栈技术、隧道技术.结合南京某大学校园网络的部署方案,将过渡技术运用于其中,实现双网兼容,双网互通.     

基于packet tracer的IPV4/IPV6双协议栈的网络设计与仿真

文章讨论了IPV6协议的概念,如寻址和地址分配,RIPng路由协议以及IPV4与IPV6网络连接的双协议栈技术.利用Packet Tracer仿真软件对网络拓扑进行了设计,通过在网络设备中部署双协议,实现了IPv4与IPV6网络的互通.     

5G基站承载的端到端双栈组网方案及现网验证

现有的4G、5G设备一般可支持5G基站承载的双栈IP地址组网,但这种双栈网络如何在现网中跨越多种专业网络、准确完成端到端组网配置,仍存在难点.针对此问题,以大规模工程部署为目标,提出5G基站承载端到端双栈组网方案,并在真实网络环境下对切片分组网(SPN)系统、现网端到端进行了测试与验证,给出了测试结果,验证了双栈组网方...     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.