面向对象的无单元法

介绍了一种用C 进行的面向对象无单元方法程序设计;定义了一些关键的类并将有些类设计成类等级,从而建立了包含权函数、基函数和形函数在内的面向对象无单元法程序类库,在此过程中考虑了无单元法与有限元法的某些联系,保留并重用了面向对象有限元法程序中的一些类。本文提供了一种无单元法大型分析软件开发新途径。     

自适应有限元局部P加密的面向对象程序实现

本文采用了面向对象的程序设计方法，以C 作为编程语言，构造了一个局部自适应有限元P加密程序。研究内容涉及从Serendipity函数的构造、单元的形成、自升阶算法以及误差估计和判断。最后采用C 的一系列类及成员函数实现了这些功能，并构造了相应的输入输出模块，使其成为一个完整的自适应有限元分析程序。文中给出的计算结果表明，在P加密有限元分析程序中，误差随着阶数的升高而下降。而且，局部P加密的区域也集中在应力奇异的部位。这验证了文中的理论推导及程序实现的正确性。     

A generic framework for time-stepping partial differential equations (PDEs): general linear methods,object-oriented implementation and application to fluid problems

Time-stepping algorithms and their implementations are a critical component within the solution of time-dependent partial differential equations (PDEs). In this article, we present a generic framework – both in terms of algorithms and implementations – that allows an almost seamless switch between various explicit, implicit and implicit–explicit (IMEX) time-stepping methods. We put particular emphasis on how to incorporate time-dependent boundary conditions, an issue that goes beyond classical ODE theory but which plays an important role in the time-stepping of the PDEs arising in computational fluid dynamics. Our algorithm is based upon J.C. Butcher's unifying concept of general linear methods that we have extended to accommodate the family of IMEX schemes that are often used in engineering practice. In the article, we discuss design considerations and present an object-oriented implementation. Finally, we illustrate the use of the framework by applications to a model problem as well as to more complex fluid problems.     

Aspects of Rich Accessibility User Experiences

We present an approach to providing broad-based accessibility to graphical applications by employing the capabilities of the Eclipse platform and aspect-oriented programming (AOP) in a way that leverages the strengths of each. We first describe the Eclipse platform and the variety of frameworks that can be useful to the effort. We also present the advantages of aspect-oriented programming and contrast aspect-oriented programming with object-oriented programming (OOP). Then, we discuss how to use the Eclipse frameworks and AOP in the design of accessible Eclipse-based applications and share some situations of when to leverage these frameworks and when we do not from the perspective of robustness and efficiency.     

软件复用技术实现策略研究

首先分析和提出了一种基于ＯＷＥ（ＯｂｊｅｃｔＷｉｔｈ Ｅｖｅｎｔ）的软构件描述方法,然后深入探讨了如何利用面向对象方法实现软件复用的策略,最后着重分析了继承机制对软件复用的支持以及在分布处理环境中的改进方案．     

基于J2EE的数据持久模型的设计与实现

针对面向对象技术和关系数据库企业应用开发的通用环境,对数据的持久解决方案并实现数据持久模型进行了研究．基于对象一关系映射技术,使用代理模式进行持久化管理,将底层的数据访问进行独立封装,并根据业务请求和映射信息文件动态地生成SQL代码,从而使得对象模型与关系数据库之间具有无关性;同时,通过动态分配机制和缓冲机制大大提高了数据访问的效率．     

基于C/S模式的MPEG-4应用开发技术

MPEG-4把对象当作帧的最小可访问单位，这使基于内容的具有灵活性和交互性的应用成为可能，本文在介绍MPEG-4系统的基本概念后讨论了使用MPEG-4系统创建应用的过程．并给出一个视频点播应用的原型．它运用对象建模技术使用对象图和状态图来描述．     

Object-oriented modelling and simulation of a motorcycle

The design of a control oriented motorcycle model for the simulation of two-wheeled vehicles is widely recognized to be a very challenging task, as a complete analytical model is not directly available, due to its complexity and its high sensitivity to parameters' variations. Accordingly, a reliable model should be based on multibody modelling tools endowed with automated symbolic manipulation capabilities. This paper presents a simulation model for the dynamic behaviour of a motorcycle based on the object-oriented modelling paradigm developed in Modelica, within the Dymola environment. Specifically, we illustrate the modular approach to motorcycle modelling and discuss the tire-road interaction model, which is the crucial part of the proposed model. The validity of the proposed simulation model is assessed on real data, measured on an instrumented test vehicle. Further, to perform the verification phase a virtual driver model has been implemented, which allows to track both a roll angle and a target speed profile during different maneuvers. In particular, the behaviour of the driver is modelled as an inverse pendulum, with a rotational degree of freedom along the forward axis. This allows accounting for the driver lean angle, which is necessary to fully capture the real driving behaviour and its effects on the overall vehicle dynamics.