云数据中心SDN/NFV组网方案、测试及问题分析

随着科技的发展,SDN/NFV组网的应用对于我国网络的发展具有非常重要的意义。SDN/NFV组网在云数据中心实现了网络虚拟化,促进了云数据中心的发展。但是SDN/NFV组网中仍然有些问题需要进行进一步的探索。本文笔者对于云数据中心SDN/NFV组网方案、测试及问题进行了有效的分析。     

云数据中心SDN/NFV组网方案、测试及问题分析

云计算技术的快速发展和广泛应用使得数据中心的业务形态产生了翻天覆地的变化,SDN和NFV两大技术联合应用在数据中心优势显著,真正实现了网络资源的虚拟化.经过有针对性的SDN/NFV规模组网评测,可以看到SDN/NFV已经具备在云数据中心网络的部署条件.同时,在方案制定和测试验证过程中也发现了一些关键问题需要未来进一步研究和探讨.     

NFV与SDN在城域网中的应用

NFV(网络功能虚拟化)与SDN(软件定义网络)的运用将成为下一代网络发展的核心技术,两者通过互补共同促进网络更加灵活和简单,为网络带来活力与生机。文章比较NFV和SDN的特点及其相互关系,结合IP城域网面临的挑战和实际需求,提出NFV与SDN在城域网中的应用场景和演进步骤,并指出城域网实现NFV与SDN运用过程中面临的问题。     

基于电信边缘云的流量调度研究

电信运营商传统的电信机房面临着大量的运营和运维成本开销,网络功能虚拟化(NFV)与软件定义网络(SDN)也在迅猛发展.本文提出了基于网络功能虚拟化(NFV)与软件定义网络(SDN)的电信边缘云化数据中心流量优化调度机制.电信边缘云有效减少了资本性支出和运营及运维成本,并使得新业务的部署及推广发布具有较高的灵活性和伸缩性,有效增强了业务创新能力.     

基于SDN与NFV的融合网络架构研究

在对SDN(软件定义网络)和NFV(网络功能虚拟化)的背景及特征进行分析的基础上,将SDN的集中控制管理与NFV的网络功能虚拟化充分融合,对基于SDN与NFV的融合网络架构进行研究。引入融合架构开放接口有利于架构创新,同时可加快应用及服务的更新上线速度,提高网络效率及资源利用率,对通信网络未来的发展具有重要意义。     

基于SDN和NFV的云数据中心网络服务

虚拟私有云和业务链是云数据中心下一阶段提供的核心网络服务,它们对现有云数据中心网络造成了巨大挑战,如网络虚拟化、业务编排、网络并发配置能力等,SDN和NFV是解决以上问题的技术手段。本文对SDN和NFV的解决方案、产业链成熟度以及未来研究的重点进行了分析和研究。     

中兴通讯:SDN/NFV引入广电网数据中心是首选

Q 在电信网络中越来越被重视的SDN/NFV是否适合在广电网络中应用? 郝男男:目前SDN/NFV技术在广电系统改造方面还没有大规模应用和部署.但对于广电行业的未来最重要的一个发展方向——数据中心业务来说,SDN技术的应用将比较迫切且大有前景.传统的数据中心目前在为互联网企业提供业务的同时存在大量虚拟化方面的需求,当前电信运营商、政府、企业在建设和使用数据中心的时候也都在考虑引入SDN技术,将不同地区的数据中心内部进行SDN化改造,并在广域网用SDN技术连接成一个资源池来实现资源灵活的分配和调度,能够为用户提供更好的业务体验.对于同样积极发展数据中心业务的广电系统来说,引入SDN技术的虚拟化数据中心也将是一个重点课题.     

SDN/NFV组网技术标准

软件定义网络(SDN)/网络功能虚拟化(NFV)技术为降低网络构件成本,实现灵活组网提出了便利的方案,是信息通信技术(ICT)产业发展不可缺少的重要支撑。通过对中国通信标准化协会(CCSA)未来数据网络特别工作组(TC1 SWG3)在SDN/NFV组网应用场景、组网体系架构以及基于SDN/NFV的各种业务组网体系架构等方面的技术标准的介绍,认为SDN/NFV将成为未来网络的候选技术之一,TC1SWG3在后续的工作中将研究采用SDN/NFV技术的未来数据网络相关标准,服务行业应用。     

“互联网+”时代SDN/NFV技术发展与实践

"互联网+"时代,网络面临应用层出不穷、带宽飞速增长、网络僵化等挑战、互联网需要支持海量连接,支持跨域和多样化的带宽保证、低时延和高可靠性、网络可定制等要求。为解决上述问题,文章对SDN/NFV呈现出商业部署加快、从数据中心走向广域网、商业模式创新、全产业链构建等发展趋势进行了分析,阐述了中兴通讯提出的以"云"为中心、SDN/NFV技术双轮、三层重构的ElasticNet未来网络架构,以及中兴通讯从业界在移动互联网、云数据中心、5G网络、运营商网络CO重构等方面所做的大量SDN/NFV实践和创新。软硬件分离、开放可编程、虚拟化的SDN/NFV技术是解决"互联网+"时代所面临调整挑战的希望所在。     

SDN和NFV的思考与实践

通信网络已经进入快速变革时期。灵活性、扩展性和简单性将成为未来网络的基本特性,用户按需自助开通质量可保证的虚拟网络将成为未来网络的关键业务。SDN(软件定义网络)和NFV(网络功能虚拟化)成为实现以上需求的关键解决方案。针对业界SDN和NFV的发展现状,提出了典型的SDN和NFV应用场景,并介绍了中国移动在相关领域的思考与实践。     

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.     

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     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first