大数据中心集群异构网络基准性能测试方法

针对BDC(大数据中心)集群异构网络缺乏精确、系统和规范化的性能评测优化方案问题,构设BDC集群异构网络基准性能测试指标体系,建立基于STC(思博伦测试)平台的BDC集群异构网络基准性能测试模型,提出一种集群异构网络基准性能测试方法及其指标优化方案。通过实验验证,文中模型能够基于BDC拓扑结构分析,快速定位网络性能瓶颈,实现评测指标的智能迭代优化,在网络性能提升的前提下显著降低系统响应时间。     

大规模数据中心内云计算网络演变的研究及分析

本文以大规模数据中心内云计算网络演变为研究对象,首先对数据中心内云计算现有三层传统网络架构进行了研究和分析;其次随着云计算的快速发展,数据中心内业务激增,现有三层网络架构遇到瓶颈,无法支撑云计算对大数据中心网络的主要需求,本文充分研究Spine-Leaf架构网络,通过详细的技术比对,建议大规模数据中心内云计算网络采用拥有高可靠、高智能、低延时特性的Spine-Leaf架构,并给出具体的设计方案。     

基于SDN的跨数据中心承载技术

互联网产业的发展和云计算的兴起催生了跨数据中心互联的需求,而软件定义网络技术为解决数据中心互联的网络瓶颈提供了重要途径.首先介绍了几种常用的数据中心互联技术,分析了SDN的技术优势,然后提出了一种基于SDN的运营商数据中心互联承载技术方案,并阐述其实现思路.该方案可实现DC间的网络虚拟化,能够提供用户业务定制、网络自动开通、任意虚拟机间的策略隔离、流量调度、用户就近访问、DC间的容灾备份等业务功能.     

SDN技术在电力企业数据中心应用的探索与研究

随着电力企业数据中心网络规模的不断增大和网络管理难度的不断提高,如何更有效地管理电力企业数据中心网络成为一项急迫的研究问题.面对这一问题,首先介绍了软件定义网络(software definednetworking,SDN)这一创新的网络架构技术,并着重对现有SDN在数据中心的部署方案进行了综述分析,最后以电力企业数据中心的云服务为实际案例,提出了SDN在电力企业数据中心尤其是桌面云池体系中的部署方案,并对其具体实施方式进行了探索及可行性分析.     

数据中心网络中的无线通信技术

文章认为将无线通信引入数据中心网络(DCN)是构建DCN的一种新选择,可以免除布线烦扰,从而方便维护无线节点;可以便捷地在服务器间建立链接,从而避免多跳传输额外代价;还可以动态改变DCN中的拓扑结构,有效减少"瓶颈"节点的流量。文章介绍了一种将无线通信与有线通信相结合来构建数据中心网络的新颖方法,并从物理构建和全局优化两个方面对相关新技术进行了分析。这些技术包括60GHz无线频段通信技术、3D波束成形、节点布置方法、基于遗传算法的信道分配等。通过这些技术的研究成果,可看出无线通信技术可大幅度提高数据中心网络性能,具有广阔的应用前景与理论研究价值。摘要:     

高性能并行集群的性能测试与优化研究

以IBM BladeCenter高性能集群系统性能测试为背景,研究大规模集群的性能测试与优化方法.通过对基于区域分解大规模线性方程组中并行求解算法在4个测试方案下的测试和分析,得到了其加速性能随计算节点数的变化曲线.结果表明,该高性能计算机集群具有很好的加速性能、稳定性,达到了预期的测试目标,为基于该并行平台的进一步并行开发研究奠定了基础.     

基于数据流方法的大规模网络异常发现

随着网络规模和速度的增加,大规模网络异常发现要求检测算法能够在无保留状态或者少保留状态下对G比特级的海量网络业务量数据进行实时在线分析。针对在高速骨干网上进行大规模网络异常发现的特点和要求,提出了一种基于数据流的大规模网络异常发现的方法,第一次将数据流模型用于大规模网络的异常发现。主要包括以下创新点:设计了一种面向异常发现的网络流量概要数据结构和突发高频事件检测算法;提出了一种基于安全监测策略定制的预查询方法来进行多数据流的关联监测并且对数据流查询进行了优化;在真实数据分析的基础上,对网络业务量进行了数据约减,使得监测部分特殊类型的数据流能最大程度地获得整体网络业务量的变化特征以提高异常发现的效率。通过真实网络环境下的实验和性能评价验证了数据流方法的有效性。     

基于APM的网络性能管理研究

在功能分析的基础上,提出了一种基于APM技术的面向业务性能监测分析的网络性能管理解决方案.通过监控系统各个层面的性能数据,将网络业务、服务作为重要的被管理对象,强调了从应用角度对网络性能的监测及分隔故障,不仅能够使用户可以直观了解关键业务应用的运行效率,监控关键业务的应用性能,快速进行故障定位,还能发现并解决性能瓶颈,提供性能优化方案并指导系统建设.     

基于剩余负载率的动态负载均衡研究

为进一步提高集群系统服务的性能,在对静态负载均衡和动态负载均衡的优缺点分析的基础上,提出一种基于剩余负载率的动态均衡机制.该均衡机制采用剩余负载率作为负载状态的评价标准;针对服务器各节点性能的不同,提出采用BP神经网络训练节点;并设计了一种基于流表的静态分配策略和基于负载预测的动态分配策略相结合的任务分配策略来实现任务在集群系统各节点间的动态分配,从而降低了服务器各节点之问任务重新调度的次数,提高了集群系统的服务性能.实验结果表明,该均衡机制是可行的、有效的.     

基于集群的深空测控系统设计策略

针对目前航天领域对深空探测系统的任务需求,利用集群技术适用于大数据量和并行计算处理的特点,提出了一种基于集群的深空测控系统的设计和实现策略,介绍了系统的架构和主要工作流程,并着重从系统平台选取、相关并行处理模型和预处理方法等方面对系统数据中心的设计策略进行了详细描述。对系统的主要功能和计算能力进行了说明,并结合系统的精度测试数据,对系统的性能进行了分析和总结。     

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.     

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.     

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.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.