基于XML的电力数据集成平台研究

为了解决电力系统内部异构数据共享和集中管理的问题,提出基于“集成数据库-中间件”的四层电力数据集成平台框架设计方案。该方案结合可扩展标记语言XML的优势定义数据交换格式,参考HSDA视图的组织形式搭建集成数据库,通过查询转换器、数据合法性验证工具以及数据转换器实现对用户请求的中间处理,最终将转换得到的XML文件提供给Web服务器,实现电力数据集成平台系统。实践证明,该方案对异构数据集成问题的解决提供了一个切实可行的模式和方法,具有较好的可扩展性和适应性。     

XML与异构数据转换技术探讨

提出了异构数据库数据转换的问题,对可扩展标志语言XML进行了简要的说明,介绍了利用可扩展标志语言XML文件作为中间数据存储文件进行异构数据库间数据转换的机制,并给出了通过文档对象模型DOM和XML规范Schema文档以及XSLT样式表文件进行异构数据库数据转换的实现方法。与传统的异构数据转换方法相比,本方法具有开放性、移动性、适应性、可扩充性以及易于维护等特点,应用前景更加广阔。     

基于XML的高校信息集成平台的研究

研究高校综合管理过程中存在的信息孤岛问题,并提出相应的解决方案,以及使用的关键技术。重点分析数据库数据到XML文档数据转换的方法、XML文档存储模式以及将XML查询转化为SQL的查询转换问题。该方案简单易行,既实现了应用系统间的数据交换与共享,同时也保留了已有的信息资源,保证了各部门仍然可以按照原来的方式运行。     

基于XML的异构数据库集成中间件的研究

为了有效地利用信息资源,实现数据共享,提出了一个基于XML的异构数据库集成中间件的解决方案.着重阐述了该中间件的设计思路和各个模块的功能和实现过程.通过实现关系数据到XML数据的转化、集成,该中间件屏蔽了各个异构数据源的平台、系统环境、内部数据结构等方面的异构性,为用户提供了一个统一和透明的访问接口.     

基于对等网的异构数据集成系统中的数据更新

在基于对等网的异构数据集成系统中,部署在各个异构数据对等体上的数据库系统具有分布性、独立性和异构性,对等体间的数据需要进行交换、整合,实现信息共享,这就使数据更新成为数据集成系统的一个重要课题.由于现有的一些数据集成技术,如各种专业转换工具、联邦数据库等,都存在着灵活性差、交互性低等缺点.文中提出了将包装器和JXTA通信适配器相结合的方案,实现了异构数据对等体问数据库的信息访问,集成信息双向传输,资源的发现以及差异信息的主动式同步.     

在异构数据库环境中实现数据集成

如何从异构数据源中抽取、集成所需的数据,是目前众多企业Web信息平台面临的主要问题。利用XML跨平台,松散耦合等结构特点,以XML作为公共数据模型将来自不同数据源的数据转化到统一的数据框架中,进行交互、转换和进一步的加工,以实现异构数据的集成、共享及利用,为企业内部信息的交互提供了一种高效的解决方案。     

基于异构数据融合的数据库智能集成方法

目前研究的数据库智能集成方法存在的集成精度低、集成时间长、数据失效率高、集成效果差等问题,该文研究了一种基于异构数据融合的数据库智能集成方法。采用权重平均法、D-S证据理论法和投票表决法实现复杂的异构数据融合,对来自不同数据源的多方数据进行协同处理,减少数据库数据的冗余现象,综合互补数据信息,明确数据间的关联性,便于提取协同信息。并通过建立公共模型、明确查询处理器的查询分配,确立数据库的关系模式,便于数据库的管理,同时制定详细的数据查询流程,以快速且准确地响应用户查询需求,完善数据库的集成功能,并促进异构数据融合技术的进一步发展和应用。实验结果表明,基于异构数据融合的数据库智能集成方法能够有效提高集成精度,缩短集成时间,降低数据失效率。     

基于XML的音乐数据库异构集成研究与实现

在音乐信息检索领域,不同类型、不同存储位置的音乐信息面临共享的需求,异构数据集成是必须解决的问题。探讨了已有的主流异构数据集成策略,采用基于XML标准格式文档的异构数据集成参考模型,对基于Oracle的音乐检索网站开发过程中的数据集成进行了应用研究。     

基于XML的系统数据集成方法研究及应用

数据集成已经成为当前软件开发过程中必须解决的问题.文中给出了一个基于XML的数据集成解决方案,引入主动机制监控数据源变化,实现目标系统数据及时更新.并利用XML消除数据库之间的异构差异,实现异构数据集成.该方案在实际应用中取得了良好的效果.     

基于XML的异构数据库数据集成

由于计算机的广泛应用以及各大数据库厂商的不同商业标准,使得现代社会在海量数据中的数据交换成为一种难题.分析了数据库的特点及XML的特点,设计了基于XML的异构数据库数据集成方案.并以关系型数据库为例阐述了XML与关系型数据之间的双向映射方法.     

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.     

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.     

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.     

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