面向服务能力的综合化系统任务有效性度量

立足健康管理视角,旨在探讨综合化复杂系统的任务有效性的度量问题。分析了生命期内系统健康与任务有效性的关系,提出了适合综合化电子系统中使用的任务有效性度量模型,并基于对模型的分析给出了对综合化系统进行健康度量的方法。     

不确定退化测量数据下的剩余寿命估计

剩余寿命估计是工程系统预测与健康管理的关键.目前,基于观测的系统退化数据进行剩余寿命估计得到了很大的关注.由于系统随机退化过程和测量误差的影响,测量数据中不可避免包含退化随机性和测量不确定性.然而,现有基于观测数据的剩余寿命估计研究中,没有将退化随机性和测量不确定性对估计的剩余寿命分布的影响同时考虑.鉴于此,提出了一种基于Wiener过程且同时考虑随机退化和不确定测量的退化建模方法,利用Kalman滤波技术,实现了潜在退化状态的实时估计.在退化状态估计的基础上,得到了同时考虑退化状态不确定性和测量不确定性的解析剩余寿命分布.此外,提出了一种基于极大似然方法的退化模型参数估计方法.最后,通过陀螺仪的退化测量数据验证了本文提出的方法优于不考虑测量不确定性的方法,可以提高剩余寿命估计的准确性.     

基于电子云平台的产业链创新与服务设计

为了使用户的个性化需求在产品服务中更好的突出,本研究以电子云平台的服务资源为基础,通过资源描述框架(RDF)模型对产业链资源数据进行描述以支撑庞杂词汇的语义建模。利用模糊语义相似度算法对构建的云平台供需与服务映射寻找功能相近的服务,在对服务质量的评估过程中,依据需求订单协同管理引擎工作流程,构造服务质量Qo S评估体系实现产业链的需求与服务映射云服务平台的有效性,结合实际案例对模型进行初步验证性应用,取得了良好的效果。     

基于GIS的高校土地资源信息管理评价系统设计与应用

为了提升高校土地资源管理工作的效率,实现对高校土地相关数据、图件进行数字一体化的规范管理,进一步强化信息管理手段的作用。系统运用地理信息系统(GIS)技术建立了图文一体化的空间数据库,并基于GIS平台设计了高校土地资源信息管理评价系统,实现了地图查询、土地利用评价、成果输出等功能。该系统的建立改变了目前高校土地资源基本以纸质方式管理的现状,为高校土地利用的决策提供科学高效的数据支撑。     

基于广电网络的标准地址信息管理系统的设计与探索

有线电视是住房的基础公用设施,有线电视用户实际上是按住房管理的,地址资源是广电业务最为基础和重要的数据。统一的标准地址信息,可以为广电的业务、运维、支撑和管理系统提供规范信息,并可实现与各应用系统的对接。本文运用对系统需求进行了分析描述,对系统模型和接口设计进行7设计描述,并描述了系统实现功能和过程。     

P2P系统中一种基于代理的RDF文档查询模型

P2P系统中基于关键字的资源查询机制，有一定的局限性。文章从语义Web的相关技术入手．利用RDF对资源进行描述，并通过多代理的合作在P2P系统中实现共享资源的查询。描述了系统模型和各Peer节点的模型，介绍了代理的功能及其交互过程，给出了相关的实现技术。     

一种基于资源传输路径拓扑有效性的链路预测方法

链路预测旨在利用网络中已有的拓扑结构或其他信息，预测未连边节点间存在连接的可能性。资源分配指标具有较低复杂度的同时取得了较好的预测效果，但在资源传输过程的描述中缺少对路径有效性的刻画。资源传输过程是网络演化连边产生的重要内在动力，通过分析节点间资源传输路径周围拓扑的有效性，该文提出一种基于资源传输路径有效性的链路预测方法。该方法首先分析了节点间潜在的资源传输路径对资源传输量的影响，提出资源传输路径有效性的量化方法。然后，基于资源传输路径的有效性，通过对双向资源传输量进行刻画，提出了节点间传输路径的有效性指标。在12个实际网络数据集上的实验测试表明，相比其他基于相似性的链路预测方法，该方法在AUC和Precision衡量标准下能够取得更好的效果。     

网管融合建模的思考

随着网管集约化诉求的日益强烈,电信运营商建立综合化网管系统的思路也日渐明确。基于网管系统的特点,结合笔者长期在综合资源建设方面的经验,阐述了在全专业统一管理的情况下,综合化网管进行数据融合的建模思路,通过抽象大类建模+元数据的方式,实现全网模型统一,解决核心模型的稳定性差和不易于扩展的难题。     

基于维纳过程的卫星用光纤陀螺剩余寿命预测

卫星用光纤陀螺的剩余寿命预测是卫星健康状态管理中的一个关键问题。针对传统的退化过程建模不能考虑同批设备中个体差异的问题,提出采用一种基于维纳过程的随机变量模型对光纤陀螺在空间环境下的退化特性进行建模。该模型将维纳过程中的漂移系数看成随机变量以描述个体差异,传统的维纳过程是其特例。依据该模型,可以得到光纤陀螺的可靠性指标和剩余寿命信息。仿真试验表明,文中提出的退化建模方法的精度明显高于传统方法,具有一定的工程应用价值。     

CHMM和AR模型在轴承性能退化评估与预测中的应用

经典的故障诊断技术可对系统运行状态进行实时评估,但在实际应用中更希望预知故障的发生以便对人身、经济安全做出保障。轴承作为机械设备的关键部件,其损坏会造成严重的工程事故,因此需对轴承进行故障诊断。文中引入连续隐马尔可夫模型以对数似然数作为评估指标来评估性能退化,即利用基于模型输出的对数似然率结合自回归模型对轴承进行性能退化预测。为了更好地验证方法有效性,文中使用了两组全寿命数据互为对比。结果显示,使用基于连续隐马尔可夫模型的轴承性能退化评估法对轴承性能的退化进行评估效果良好,自回归模型在寿命预测上得到了较为精准的结果。     

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.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

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.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

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.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

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.