基于网格和XML的异构数据库集成模型

异构数据库的集成问题是当前数据处理领域内研究的一个热点.本文在分析了异构数据库系统的关键问题和解决方法的基础上,提出了一个基于网格和XML的异构数据库集成模型.并重点分析了该模型的结构和实现方法,该模型采用XML作为信息传输的数据格式,通过GT4网格计算中间件来实现对各异构数据源的高效访问.     

基于XML的异构数据源集成查询中间件的设计和实现

企业ERP建设中形成了许多异构数据源,为了有效使用这些数据有必要进行异构数据源的集成.为此给出了基于XML的异构数据源集成查询的中间件的设计和实现方案.该中间件具有接收查询的功能,还具有对用户查询进行语法分析、生成查询任务树、优化查询、分解查询和组合数据并以XML格式保存信息的功能.     

基于CORBA的分布式异构数据模型优化研究

提出了一个基于CORBA中间件的分布式多层异构数据库信息共享结构模型,在该模型中将数据库的访问集成到CORBA中间件中,并重点提出了一种对数据库的操纵以及应用服务器与数据库服务器连接的优化策略和设计方法;笔者采用Java和CORBA技术结合的方法构建分布式异构系统,以解决系统的通信及交互性、安全性、扩展性问题,从而实现了一个不依赖于表示层编程语言的透明访问机制.     

基于XML高校异构数据源系统的集成设计

高校信息系统需要访问异构数据源中的数据,因此,需要一种新的系统架构来解决多个异构数据源的信息访问问题.首先对高校信息化建设过程中遇到的异构数据源问题进行了分析,并比较了目前已有的异构数据源集成方法的优劣性,在比较的基础上介绍了XML技术的优越性,进而提出了XML框架下异构数据源集成中间件设计的数据集成方案.最后总结了异...     

异构网互联新技术应用

在现有异构数据库领域研究成果的基础上,采用XML的异构数据库中间件技术实现异构数据库之间信息交换,进行交互、转化和进一步加工,以便更有效地利用信息资源,这一方法具有可扩展性好的优点,在实际应用中有着较广阔的应用前景.     

异构数据库集成中间件的设计

对现有的异构数据库进行了分析,提出了异构数据集成中间件的设计方案,并着重阐述了该中间件中各个模块的详细设计内容和设计思想。最后对该设计方案进行了应用分析和总结。     

基于Agent技术的交园一卡通异构数据库中间件研究

为了解决高校校园一卡通网络环境中的异构数据库集成和共享问题,提出了一个基于Agent的高校一卡通异构数据库集成中间件系统模型,通过将数据库记录转换成XML文档形式,为校园一卡通异构数据库集成提供一种新方法。     

基于CORBA的数据集成中间件的设计与实现

在研究了国内外异构数据源集成技术的基础上，给出了适合多种异构数据库数据集成的基于CORBA的体系结构、模式集成方法、查询分解算法以及查询优化方法，设计并实现了一个数据集成中间件系统Panorama．Panorama提供了一种研究异构数据集成的实践途径，是一种有效的数据集成工具．     

基于中间件的异构数据集成方法

数据集成是企业之间或企业内各部门协同合作的需要。它的目标是实现各个异构数据源之间的数据共享,从而有效地利用资源,提高整个应用系统的性能。针对当前企业对异构数据库集成的迫切需求,给出了一个基于XML和Java的异构数据库集成中间件系统解决方案。     

基于COM+异构数据库访问实现技术

介绍了对异构数据库访问的实现技术.详细论述了多数据库的中间件实现技术、数据库的ADO访问技术、MFC和ADO的结合编程、数据库集成以及数据的转储.在异构网络环境下为用户提供了一个界面友好、操作方便灵活、集数据转储、数据操作于一体的集成化平台.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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