基于Hadoop的海量电信数据云计算平台研究

传统的数据分析方法面对海量电信数据存在管理和分析难的问题.Hadoop是一个可实现大规模分布式计算的开源框架,具有高效、可靠、可伸缩的优点,被广泛应用于云计算领域.本文在对云计算和Hadoop进行分析和研究的基础上,提出了一种针对海量电信数据的分布式云计算方法,建立了基于Hadoop的海量电信数据云计算平台.实验证明,该平台能够有效完成海量数据的管理和分析任务,提高海量数据分析的速度和效率.     

基于Hadoop云计算平台的海量文本处理研究

针对海量文本数据处理,为实现快速文本处理响应,缩短海量数据为辅助决策提供服务的时间,基于Hadoop云计算平台,建立HDFS分布式文件系统存储海量文本数据集,通过文本词频利用MapReduce原理建立分布式索引,以分布式数据库HBase存储关键词索引,并提供实时检索,实现对海量文本数据的分布式并行处理。实验结果表明,Hadoop框架为大规模数据的分布式并行处理提供了很好的解决方案。     

基于云计算的海量数据处理平台设计与实现

针对传统并行处理技术在海量数据处理中存在的实际应用问题,利用云计算技术强大的计算能力、高效的海量数据处理方式,结合关系数据库实时访问的优点,在Hadoop分布式计算框架基础上,采用Map-Reduce架构,设计并实现了基于云计算的海量数据处理平台.实践证明,该系统在计算能力、稳定性、可扩展性等方面都优于传统并行处理的技术,能有效解决海量数据大并发访问.     

基于Hadoop云平台的模糊聚类算法研究

随着信息科学技术和移动互联网技术的快速发展,各种信息数据持续呈指数级爆发式快速增长。当今数据分析主要的目标是充分发掘出隐藏在海量数据背后信息,以此来推动各行业稳定持续发展。显然,云计算技术的出现为海量数据挖掘工作提供了便利,在传统单机模式的数据挖掘基础上,Hadoop云计算平台能够将信息数据分片处理,并将数据片分配到各个节点并行处理,大大提高了数据处理的效率。文章详细研究了基于Hadoop云计算平台的模糊聚类算法,充分利用Hadoop云计算平台并行化来解决对大规模海量数据挖掘的问题,并能够为社会经济发展作出贡献。     

云计算下基于贝叶斯网络的多传感器目标识别

基于云计算可实现分布式并行程序海量数据处理的特点,提出将多传感器目标识别融合处理部署在云计算Hadoop平台上,并将其运行在多个节点组成的计算机集群上。根据目标识别原理建立贝叶斯网络结构,对目标识别预处理得到的数据进行融合计算,推理目标类型,并对不同情况下的Hadoop集群效率进行分析比对。实验结果证明了将目标识别融合处理部署在云计算平台上可有效提升运算效率。     

分布式大数据管理系统的设计与实现研究

社会高速发展的同时,数据也呈现爆炸式的增长,传统的数据库管理系统已经无法满足海量数据的存储需求。云存储技术成为一种新的数据存储方案,在Hadoop分布式系统的基础个,提出了一种基于云计算环境下的分布式大数据管理系统,为海量的文件存储与处理提供平台。对云计算大数据存储系统进行功能分析,同时还对大数据管理系统的框架进行设计,最后通过实验的方式验证了分布式大数据管理系统相比于其他方式的管理系统,处理的速度更快,存储时间更短,存储效率更高。     

基于云计算的海量数据存储模型

针对目前网络产生的数据越来越多以及随之而来的海量数据的存储问题,在云计算技术上,依据Hadoop及虚拟化技术,提出了基于云计算的海量数据存储模型。将医院信息化的海量数据部署在Hadoop平台上,根据云计算的核心算法MapReduce来处理数据,最后将数据存储在虚拟资源池中。通过实际的应用,该模型可以很好地克服现行的存储方式存在的不足,解决海量数据在存储当中存在的问题,并且能够很好地提高存储的效率。     

基于Hadoop技术的数据查询平台建设

传统的关系型数据库架构在应对电信运营商海量的大数据处理时建设成本高昂,处理能力低下,已经无法满足在大数据场景模式下的新型业务需求。Hadoop云计算平台作为一种新型的大数据处理方案,充分利用其低价格和高性能的优势,可以满足海量数据存储及数据处理功能。文章在对Hadoop技术介绍的情况下,设计一套基于Hadoop架构的数据查询平台,实验证明,该平台能够有效提高数据处理效率,降低建设成本。     

基于分布式云计算技术进行海量数据运营的探讨

电信企业内部会在清单、信令、日志等多个地方生成海量数据,传统的处理方式成本高、速度慢,无法应对互联网时代快速、高效的要求.针对这一问题,采用云计算技术Hadoop集群处理海量用户清单,为业务系统和分析系统提供一个分布式可动态扩充的数据库,有效地提升了清单入库、查询和统计速度,同时硬件成本降低了90％以上.     

以混合存储模型实现云计算平台对电信海量数据的处理

利用云计算平台获取海量存储空间和弹性计算能力是当前学术界研究的重点和产业界应用的方向。文章提出的海量数据分布式处理模型,基于混合型数据存储,实现一种以数据为中心的、计算密集型的、高经济性云计算平台。实践证明,在海量数据处理方面,该模型可以很好发挥关系数据库和非关系数据库的优点,具有良好的参考示范价值。     

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.