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。     

IPv4网络技术的变革研究

随着网络信息技术的不断发展,IPv4网络因为协议本身的一些缺陷,正逐渐被IPv6网络所替代。在IPv4向IPv6网络迁移的过程中,出现了很多网络迁移技术,主要包括双栈技术、隧道技术、NAT-PT技术。目前双栈技术各大运营商作为主要迁移技术,基于双栈协议的网络平台部署可实现IPv4向IPv6的平滑过渡,保障网络资源的高可用性。     

IPv6过度的安全机制研究

IPv4向IPv6过渡主要存在三种技术:双栈、隧道、协议翻译.由于IPv4已经在世界范围内广泛部置,IPv4向IM的过渡将花费很长的时间.一个成功的IPv6过渡方案取决于它跟IPv4主机和路由器等设备的兼容性,以及是否考虑过渡期间的安全性.本文分析了过渡期间的安全问题以及相应的处理策略.由于双栈技术是目前大多数企业易于采用的一种IPv6过渡机制,本文重点讨论在双栈环境下,在边界路由器上部置分布式防火墙来解决IPv6过渡的安全问题.     

基于IPv4与IPv6技术相结合高校校园网络建设

针对各大高校新、旧校区校园网络出现的问题,提出新校区采用IPv6网络技术,旧校区采用IPv4网络技术.两个网络之间的连接采用双栈IPv4/IPv6过渡技术,所有校园网三层设备均为IPv4/IPv6双栈设备,既运行IPv4路由协议,也运行IPv6路由协议.通过对域名系统DNS的查询可知,双协议栈主机中目的主机采用的是哪一种地址.对于双栈终端,IPv4网关和IPv6网关均部署在汇聚三层交换机上.在此提出的方法投资小,资源浪费少,运行切实可行,开发周期短,对于高校节约成本办学具有一定的参考价值.     

宽带私网双栈地址溯源的云化实现

在IPv4地址耗竭,加快推进IPv6规模部署的关键时刻,运营商为保证平滑过渡,并兼顾后期纯IPv6的目标,采用IPv4/IPv6双栈的方案,同时实施IPv4地址的私网化改造,解决IP资源紧缺的问题,实现纯IPv6的全网部署。通过研究私网双栈的溯源模型,结合私网双栈溯源的电信类业务应用场景,以及溯源系统在传统固网AAA架构基础剥离后的云化改造,探索固网宽带私网双栈的地址溯源云化实现方法,为后续固网AAA整体云改提供参考。     

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.     

IPv6过渡的安全机制研究

IPv4向IPv6过渡主要存在三种技术:双栈、隧道、协议翻译。由于IPv4已经在世界范围内广泛部置,IPv4向IPv6的过渡将花费很长的时间。一个成功的IPv6过渡方案取决于它跟IPv4主机和路由器等设备的兼容性,以及是否考虑过渡期间的安全性。本文分析了过渡期间的安全问题以及相应的处理策略。由于双栈技术是目前大多数企业易于采用的一种IPv6过渡机制,本文重点讨论在双栈环境下,在边界路由器上部置分布式防火墙来解决IPv6过渡的安全问题。     

下一代互联网AAA认证系统演进过程研究

分析了IPv6的3种过渡技术,并结合2种过渡技术提出了下一代互联网AAA认证系统演进策略,即第一阶段实现IPv6属性支持、第二阶段实现IPv4和IPv6双栈化、第三阶段实现IPv6单栈化。     

双协议栈技术在校园网络设计中的应用

以思科模拟器为仿真平台,通过对IPv4/IPv6双协议栈和隧道技术的研究,结合校园网络实际情况,在原有网络上启用双协议栈,并借助隧道技术加以辅助,实现IPv6网络的校内部署,同时引入HSRP协议进行网络冗余备份,保证校园网络的稳定运行,最终给出了一套完整的校园网络过渡设计方案。     

IPv6实验网与CNGI-CERNET2连接的探索与实践

针对学校平稳建设IPv6校园网络环境和智慧校园平台的目的,采用私网双协议栈技术,通过展开向IPv6过渡的基础部署以及在小范围内实现IPv6应用的实验,实现了IPv6实验网与西安教育城域网之间的路由连通,同时与CNGI-CERNET2对接成功。实验网搭建成功为学校实现IPv4到IPv6网络平稳过渡做好了技术和数据铺垫工作。     

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.     

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.     

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