浅谈软件开发中的复用技术

软件复用是在软件开发中避免重复劳动的解决方法。软件复用,被视为解决软件危机,提高软件生产效率和质量的现实可行的途径。同时,随着面向对象技术出现,为软件复用提供了基本的技术支持。使软件复用得以发展,提高软件开发效率和质量。     

面向对象程序设计与软件复用技术

面向对象程序设计是—个非常实用且强有力的软件开发方法，可为软件复用提供基本的技术支持。软件复用技术是软件开发中避免重复劳动的一种行之有效的解决方案。本文介绍面向对象程序设计和软件复用的基本概念和关键技术，并提出面向对象程序设计支持软件复用的技术方法。     

原型化软件开发与面向对象技术的结合

对原型化软件开发和面向对象的技术进行了分析,找出了两者之间的结合点“软件复用”技术,并由此提出了一种面向对象的原型化开发模型。     

面向对象方法中的软件复用技术

软件复用是提高软件生产力和质量的一种重要技术,它充分利用已有的高质量软件产品和部件,快速搭建组装集成应用软件系统,能够改善软件生产的资金投入大、开发周期长.软件产品失败率高等不能满足市场需求的现状。本文介绍了软件复用的基本概念,目前软件复用的特点和现状和面向对象方法中的软件复用技术。     

面向对象软件开发技术与管理研究

面向对象方法越来越成为软件开发的主流技术,它在支持软件复用和提高软件可维护性方面比传统的软件工程有较大的改进.人们对面向对象方法的研究已经从面向对象编程向面向对象分析和面向对象设计转移.这里介绍了有关面向对象软件开发的原理和概念,详细描述了对象模型、动态模型和功能模型,简述了面向对象的开发技术及管理技术.     

面向对象软件开发技术与管理研究

面向对象方法越来越成为软件开发的主流技术,它在支持软件复用和提高软件可维护性方面比传统的软件工程有较大的改进。人们对面向对象方法的研究已经从面向对象编程向面向对象分析和面向对象设计转移。这里介绍了有关面向对象软件开发的原理和概念,详细描述了对象模型、动态模型和功能模型,简述了面向对象的开发技术及管理技术。     

面向对象式软件的结构开发及其可复用性分析

该文讨论了面向对象式软件的特性、结构,进而提出了面向对象式软件的开发策略,论述了面向对象式软件的可复用性.     

基于构件的地面轨道电路信息管理系统

在面向对象的基础上 ,引入了软件复用的概念 ,对软件构件的三个典型模型进行了比较分析 ,并利用其中的COM /DCOM模型 ,实现铁路轨道电路信息管理系统 .以软件构件理论为基础 ,本着开放性、可维护性、友好性、可扩展性的原则 ,采用面向对象技术 ,在系统级上解决并实现了软件可重用性 ,提高了软件开发的效率和质量 ,并在Windows 98操作平台上用VisualC + +实现了系统主要部分的编码工作 .在充分研究软件构件理论的基础上 ,利用面向对象技术来实现系统的各主要功能及数据的信息封装 .这使得本软件系统能与外部设备相适应发展 ,也能让用户对其进行二次开发 ,使延长软件的寿命成为可能     

基于面向对象的铁路联锁软件设计

铁路联锁软件作为铁路联锁系统的核心,担负着保证铁路行车安全的重要使命。如何提高联锁软件的可复用性和可移植性,以减少重复定义时出现的错误成为了业界不可忽视的问题。选用面向对象方法进行联锁软件的设计,可以有效地提高软件的可复用性和可移植性,从而解决了上述问题,同时也减轻了设计人员的劳动强度,提高了软件的发效率。     

浅谈软件复用的理论与技术

使用软件复用技术可以减少开发活动中大量的重复性工作,提高软件生产率,降低开发成本,缩短开发周期.本文简要概述了软件复用技术的基本概念和优势,并由此引出软件复用的分类,讨论了基于面向对象的软件复用的方法和软件复用的过程问题.     

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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