基于Hadoop的轴承监测海量数据的存储与管理

针对高速机车转向架滚动轴承监测数据的格式多样化、数据量激增带来的管理和存储问题,在分析监测数据特征和数据量大小的基础上,构建了树形索引结构对滚动轴承状态监测海量数据进行管理。利用研究所当前的软硬件环境,搭建了分布式集群系统存储海量监测数据,并对集群系统在存储和管理海量数据时的可用性和稳定性进行了探讨。通过对实际数据的测试和分析,结果表明基于树形索引结构的分布式集群系统能在一定程度上满足滚动轴承状态监测非结构化海量数据存储和管理的要求。     

基于Hadoop的分布式ETL系统研究

针对传统数据抽取、转换及加载(ETL)工具集中式执行的不足,设计实现了一种基于Hadoop平台的分布式ETL系统。该系统采用分布式文件系统存储和映射-规约并行处理海量数据架构,实现了ETL作业的分布式执行,提高了ETL效率,为大数据环境下的基础数据加工提供了解决方案。     

云计算分布式缓存技术在海量数据处理平台中的应用

随着云计算和大数据时代的到来,在满足用户对系统访问量、访问速度、访问安全的要求的同时,系统必须实时准确地处理迅猛增长的海量数据,而传统的缓存技术无法满足海量数据处理和用户高并发访问的需求.分布式缓存技术是最好的高性能缓存解决方案.本文研究如何利用云计算下分布式缓存技术在海量数据处理平台中解决该问题,分析研究了分布式缓存的关键技术、分布式缓存的一致性和分布式内存数据管理.在此基础上,分析并设计了分布式缓存系统的部署和整体架构.并将该分布式缓存系统的设计模式应用在某团购网上,进行了POC测试.测试结果证明分布式缓存技术可以缓解服务器的压力,解决海量数据和超高并发数据访问所带来的问题,提升了系统的性能、访问速度、可靠性以及降低响应延迟.     

基于大数据的分布式网络安全管理平台的设计

随着企业信息化程度与安全意识的不断提高,企业部署了大量的信息安全设备与安全监控系统用于企业信息安全防护,同时也带了海量的信息安全数据。面对如此大规模的信息安全数据,传统的安全管理平台显得力不从心,近年来随着各种基于针对大数据处理的分布式开源组件在互联网行业广泛的推广与应用,也为海量信息安全数据处理提供了一种新的思路。因此,文中提出了一种基于大数据的分布式网络安全管理平台的设计,平台是一套基于分布式文件系统的开源架构,以Kafka为数据收集工具,使用Hbase和My SQL作为多源异构数据数据库,结合Storm和Elastic Search进行实时处理与检索,并通过实验验证了平台的快速检索与关联分析能力,为企业部署大数据安全管理平台提供有力的依据。     

基于WiFi数据的实时高效定位分析系统设计

近年来很多室内定位技术被提出,但是大多数技术都是重点研究怎样提高定位精准度,却忽略了系统处理海量数据的稳定性、实时性和高效性。特别是在机场高峰时段和大面积航班延误情况下,大量旅客聚集在航站楼产生了海量WiFi数据,导致传统的数据处理架构出现处理数据不及时、统计实时性差、稳定性差的问题。针对该问题设计一种高吞吐、低延迟的分布式实时数据处理架构。该架构使用消息中间件、实时流数据处理、内存并行计算和分布式数据库读写技术,实现了大客流环境下处理海量实时WiFi数据的分布式定位分析系统。通过使用模拟数据和实时数据进行多组实验测试,验证了系统在保持定位算法准确性的情况下,仍然具有稳定、实时、高效的定位分析能力。     

基于Hadoop平台的电信大数据入库及查询性能优化研究

随着移动互联网的快速发展,电信运营商内部各种IT系统中的数据出现了"大数据"的特征,既有的技术架构和路线已无法高效处理如此海量的数据。针对流量经营大数据管理和大数据服务中海量DPI数据的数据入库和数据查询场景,提出了一种基于Hadoop的分布式数据服务架构,并设计出在该架构下的数据入库和查询性能的优化算法,通过模拟数据的实验对性能优化算法进行了验证。     

分布式实时游戏服务器集群架构设计

为保证网络游戏的通畅性,设计一种具有高性能的分布式游戏服务器架构.通过精简通信协议、数据包过滤机制从微观上减少单个数据包处理时间;利用集群技术构建服务器组从宏观上提高服务器处理能力.在此基础上构建出一个具有高性能、分布式、实时性较强的游戏服务器集群,并对该架构的处理时间性能进行了测试与分析.测试表明,在十万数量级并发请求情况下,分布式服务器集群比单个服务器处理时间性能提高1.8倍.     

基于Hadoop和HBase的分布式索引模型的研究

随着互联网上信息量飞速增长,海量数据的索引出现了难题,现行的索引方案已经难以提供高效、可靠的服务,为此,设计并实现了一种针对海量数据进行索引的平台模型。该平台模型首先利用Solr分布式索引器生成索引文件,然后利用Hadoop分布式集群,以HDFS分布式文件系统、Map Reduce分布式并行计算模型、Zookeeper同步协同系统以及Hbase分布式数据库技术来处理、协调管理索引和存储海量数据,最后通过实验测试,该平台模型可以克服现行的海量数据索引时存在的效率低的问题,同时具有良好的扩展性和可靠性。     

基于Hadoop的分布式集群平台构建方法研究

随着网络技术的发展,用户的数据量呈现指数级的增长,产生的海量数据单靠一台高性能的计算机存储,成本很高,不适合大部分的用户。基于Hadoop分布式集群平台,在构建低价的硬件上,成本低,应用场合广泛,能够满足海量数据存储的需求。介绍了Hadoop发展前景趋势和三大核心技术,详细分析了分布式集群的构建方法,成功构建分布式集群平台。     

基于云化架构的计费核心系统研究及应用

近年来,随着5G网络正式商用及互联网创新应用快速发展,通信运营商流量业务量呈现爆发式增长,现有计费核心系统的实时处理性能、稳定性压力与日剧增,文章针对可扩展性及高可用性云化设计目标,引入了AKF扩展立方体理论模型作为方法论,提出一套分布式、可配置、强运维、水平扩展的计费核心系统云化架构,并重点介绍计费核心系统的集群化云化架构,以及可扩展性和高可靠性的云化架构核心能力的设计思路,对于运营商核心系统云化转型具有参考价值。     

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.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

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.     

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.     

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.     

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.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.     

Critical Stage Rule-Based Real Time Dispatch（RTD）System in Highly-Mixed-Products （HMP） FAB

An improving utilization and efficiency of critical equipments in semiconductor wafer fabrication facilities are concerned. Semiconductor manufacturing FAB is one of the most complicated and cost sensitive environments. A good dispatching tool will make big difference in equipment utilization and FAB output as a whole. The equipment in this paper is In-Line DUV Scanner. There are many factors impacting utilization and output on this equipment group. In HMP environment one of the issues is changing of reticule in this area and idle counts due to load unbalance between equipments. Here we'll introduce a rule-based RTD system which aiming at decreasing the number of recipe change and idle counts among a group of scanner equipment in a high-mixed-products FAB.