基于SDN架构的网络安全方法研究

软件定义网络(software-defined networking,简称SDN)技术把网络的控制层和数据层进行了分离,为下一代网络的发展提供了新的解决方案.本文论述了SDN的架构和目前基于传统网络架构下的网络安全的实现方式以及内在缺陷,并阐述了基于SDN架构下的网络安全的演进和优化,希望可以为相关从业人员提供一些借鉴和参考.     

基于微服务架构的网管系统高可用体系研究

本文提出了基于微服务架构的网管系统高可用方案,该方案基于负载均衡器和可适配软件自身架构的微服务,化解耦技术实现系统整体的高可用及负载均衡,采用VCenter SRM技术实现双数据中心互主备容灾方案,探索性通过SDN+VXLAN创新技术,搭建跨局大二层网络,通过DCN三层VPN网络承载及SDN控制器实现跨局虚拟机自动迁移,满足互主备高可用要求,重点保障了业务支撑系统的7*24小时稳定运行,支撑日常网络生产及业务发展,提升业务支撑系统处理效率。     

广域网IP SDN控制器架构与关键技术研究

在研究国外运营商SDN/NFV架构基础上,基于运营商在广域网部署IP SDN控制系统的关键需求,分析实现IP SDN控制器的关键功能及相关技术,尤其是国际上各类YANG Model以及控制器南向接口的标准化现状,同时对基于实时流量的全局路径优化和流量均衡算法进行初步研究,并给出未来广域网IP SDN控制器功能架构方案,对运营商研发广域网IP SDN控制器的方向进行了展望.     

基于SDN的网络虚拟化仿真研究

软件定义网络的集中控制和可编程能力解决了传统网络虚拟化技术的弊端。为了进一步研究网络虚拟化技术,采用Mininet、OpenVirteX和Floodlight等软件,提出一种基于SDN的网络虚拟化仿真平台实现方案。总结了SDN网络和网络虚拟化特性,介绍了基于SDN的网络虚拟化仿真平台的系统架构,验证了其功能和隔离特性。提出的仿真平台为基于SDN技术的网络虚拟化创新提供了良好的平台支撑。     

基于SDN架构的IPv6过渡技术设计与实现

重点研究了基于SDN的IPv6过渡技术,首次创新性地提出了在运营商网络中引入基于SDN的IPv6过渡技术的主要应用场景及实施优势、系统实现架构、关键技术及相关部署要求,该方案的提出对于运营商网络中基于SDN的IPv6过渡技术的引入具有重要的指导意义。     

基于SDN的智能化英语多媒体教室设计

针对现有的英语多媒体教室网络监测工作量大与维护复杂的问题,结合SDN网络的快速演进,在综合考虑网络智能化和虚拟化的基础上,设计一种新型多媒体教室网络架构。此架构基于SDN技术,通过SDN的控制器集中管理所有的中控设备。详细描述了该方案的设计思想、总体架构,通过Mininet仿真平台进行测试,从而验证了该方案的可行性。最后,通过实际部署SDN网络,说明基于SDN的多媒体教室网络有助于教师更好地开展教学,有助于学生更好地学习。     

基于VxLAN的运营商二层以太网演进方案

随着互联网和通信技术的互相渗透,传统的运营商二层以太网逐渐难以适应日益增长的客户需求和日新月异的网络技术.针对传统网络技术不足,提出一种基于VxLAN的运营商二层以太网演进方案,在网络中逐步引入SDN、NFV、云计算等新技术,并从网络结构层面进行优化调整,实现向新架构的转型.通过演进方案的渐进实施,最终实现全网统一管理的基于VxLAN的新型二层以太网.     

SDN在二层专线产品中的应用探讨

对SDN在运营商的政企业务二层专线产品中的应用方式进行探讨,包括现有二层专线产品的构成与特点,详细介绍基于SDN的二层专线产品的定义、实现方案与优势,以及未来基于SDN二层专线产品在运行维护方面的需求.     

基于SDN技术的网关管理平台云化建设方案

文章描述网关终端从完整版智能网关演进至SDN（软件定义网络）网关的过程，说明SDN家庭网关管理平台在网关轻量化后成为业务管理和实现的关键。阐述SDN家庭网关管理平台的功能架构和技术架构，给出构建平台的云化部署方案，涵盖部署原则、节点架构、资源模型、云化组网、带宽保障等。最后基于系统组件的安全运行机制以及多节点之间的容灾机制给出平台的高可用方案。     

PTN网络的SDN演进

本文介绍了SDN的涵义、起源以及流派,总结了PTN网络引入SDN的价值,对PTN网络引入SDN的网络架构和实现方案进行了探讨。     

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.     

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.     

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.     

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.     

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.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks