运用COM\DCOM技术实现软件重用

组件对象模型(COM)和分布式组件对象模型(DCOM)是Microsoft诸多软件的基础,近年来获得迅速发展并得到广泛应用,本文介绍了COM\DCOM的发展、技术内涵以及如何运用COM技术来实现软件重用以提高软件的生产率.     

基于COM/DCOM的分布式计算研究与应用

分布式计算技术在软件开发中得到了广泛的应用,它使复杂的大型网络应用程序变得易于开发。基于组件对象模型COM(Component Object Model)和分布式组件对象模型DCOM(Distributed COM)的组件技术是微软的分布式对象技术。通过详细地分析基于OM/DCOM组件技术的分布式计算的基本原理,总结了开发COM/DCOM组件的基本方法和三层分布式应用程序的实现过程。最后,给出了一个用COM组件构造的三层分布式应用系统实例。     

基于COM/COM+的三层式WEB信息发布技术

首先分析了目前流行的三层式网站结构,然后介绍了利用VisualBasic开发应用于网络应用的COM组件的过程,最后对COM和COM 技术的优势进行了深入讨论.     

基于OPC的复杂工控系统的软件集成技术

企业综合信息自动化系统是一个复杂系统,要在设备、数据库和应用软件间建立通用、高效的数据读取机制,由于设备的多样性和驱动程序的不兼容性,难以实现系统的无缝集成.笔者对实现控制系统现场设备与过程监控级进行信息互连、实现控制系统开放性的关链技术OPC作了讨论.     

组件对象及其接口技术

组件对象技术以面向对象技术为基础,提供统一的面向对象实现框架;为面向对象应用建立公共的体系结构;提供对象服务和公共设施;建立支持对象互操作的标准化协议.文章在介绍了组件对象模型技术产生和发展的历史和现状的基础上,分析组件对象的概念和定义,进一步剖析了组件对象的核心部分--接口的实质,并论述了组件对象作为新型软件开发的核心技术的诸多特性.     

网络环境下控制软件的新技术

简要论述了网络环境下控制软件的新技术，着重介绍了组件对象模型，分布式组件对象模型，ActiveX组件以及客户机／服务器的主要特点，阐明了它们之间的相互关系。     

WEB数据库缓存的一种实现

组件对象模型(COM)是创建软件组件的双态标准，它为软件提供了统一的、面向对象的、可扩充的通讯协议．首先讨论了基于组件的三层式数据库应用模型和利用COM开发软件的优势，然后通过一个实例，展现了COM技术在构造WEB数据库的缓存组件中的应用．     

基于组件技术的开放式数控系统研究

针对传统ＯＯＰ技术在开放式数控系统软件开发中存在的不足，讨论了软件开发中的主流技术之一－－组件技术及其在开放式数控系统应用中的优势。在此基础上，利用控件对一般数控系统各任务单元进行了分析，给出了一重用性高，易于扩展，结构开放的数控系统软件结构模型。     

组件化程序设计方法及组件标准

为满足分布、异构的计算环境要求,组件化程序设计得到迅速发展,它允许任意两个软件组件进行跨进程、跨机器、甚至跨语言、跨操作平台通信。微软的组件对象模型COM（Component Object Model）是一种二进制网络标准,也是一种公认的组件标准。笔者从分析软件开发方法入手,着重介绍了组件化程序设计方法及其接口标准COM。     

基于COM＋体系结构的管理系统开发应用

介绍了分布式组件COM＋的体系，介绍了当前三层应用模型的结构及其优势，并给出了一个实例来说明如何在windows平台上构建基于这一新的模型应用。     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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