主题导引下压路机造型设计方法研究

探讨了一种适合压路机的造型方法，通过实例及发展趋势分析得出设计主题，应用感性工学原理及实例推导将产品概念具象化，构建了压路机的造型库。此方法可以方便、快速、高效地对产品的造型进行设计．缩短了产品设计周期，为产品迅速占领市场提供了基础。     

宽带IP网中VBR视频流量的建模与预测

VBR视频信息即将成为宽带IP网的主要流量,在考虑网络资源利用率和动态带宽分配等方面,其中一项重要的内容就是VBR视频建模及其流量预测。本文在分析VBR视频流量主要特点的基础上,阐述了视频建模时应当注意的关键问题及其流量预测过程中应用的数学方法,并给出了若干典型的VBR视频流量模型。     

Walking infrastructure design assessment by continuous space dynamic assignment modeling

For the planning and design of walking infrastructure, characterized by the fact that the pedestrians can choose their paths freely in two‐dimensional space, applicability of traditional discrete network models is limited. This contribution puts forward an approach for user‐optimal dynamic assignment in continuous time and space for analyzing for instance walking infrastructure in a two‐dimensional space. Contrary to network‐based approaches, the theory allows the traffic units to choose from an infinite non‐countable set of paths through the considered space. The approach first determines the continuous paths using a path choice model. Then, origin‐destination flows are assigned and traffic conditions are calculated. The approach to determine a user‐optimal assignment is heuristic and consists of a sequence of all‐or‐nothing assignments. An application example is presented, showing dynamic user equilibrium traffic flows through a realistic transfer station. The example is aimed at illustrating the dynamic aspects of the modeling approach, such as anticipation on expected flow conditions, and predicted behavior upon catching or missing a connection.     

三维精密测量技术在船舶脱硫系统改造中的应用

以三维扫描精密测量技术为基础,利用实景复制技术实现船舶形体及部件三维数字化采集、三维建模及船体检测,并应用于在役船舶脱硫系统快速改造工程。可以实现型线绘制、三维建模、三维虚拟安装等,为后期改装设计、零部件检测、虚拟装配、船型验收等应用提供数据支撑,极大提高从采集到检测等工序效率,减少在航船舶停泊时间,节约船舶改装和维修成本。     

Perspectives of English Language News

English isused more than any other languages, so all of usshould get a good command of it in order to be more competitive in thissociety. There're many waysto master this language, but through reading English language newspaper, with which we have so much contact everyday, is obviously more convenient and interesting. English language newspaper contain several parts, the features of each of them will be analyzed in this thesis together with a specific piece of news. Furthermore, some effective methods of reading and understanding English lan-guage newswill be proposed.     

基于舒适性和轮胎动载的车辆悬架参数优化

为了改善汽车行驶的舒适性并减小轮胎对路面的动载，以某载货汽车为研究对象，建立了多目标优化模型，并采用统一目标函数法对车辆悬架参数进行优化。优化结果表明：优化后悬架刚度减小而阻尼增大，且前悬架参数变化较小，后悬架参数变化较大；相比于优化前，车身垂直方向加速度均方根值减小了20％，前轮动栽均方根值减小了40％，后轮变化更显著，减小了49％；采用多目标优化设计方法不仅可提高车辆自身的舒适性，而且可减小轮胎对路面的动载。     

基于Java语言的安全性分析

在网络应用中发挥着重要作用的Java是一种优秀的编程语言。Java的目标是为了满足在不同操作系统平台的网络开发软件,适合于分布式计算环境的面向对象编程语言,其安全性能就显得尤其重要。现从网络应用、语言机制、运行环境三个方面入手,全面地分析比较Java和C 的安全规范,从而使我们能够认识到Java在安全机制上的优势。     

Two-dimensional Continuum Modeling Approach to Transportation Problems

The continuum modeling approach to transportation models is now gaining much attention because of its advantages in dealing with dense-network models, macroscopic problems, and initial phase planning. This paper aims to provide a comprehensive review of the development and applications of the two-dimensional continuum modeling approach. The theoretical development and models with specific or arbitrary region configurations are first discussed, and then the applications of the continuum modeling approach to the determination of facility location, route choice, pedestrian flow, and policy and socio-economical analysis are reviewed. Finally, some prospective directions for future research are proposed.     

计算机软件在公路立交三维建模中的应用

在现有的道路立体交叉设计方法的基础上,提出了三维建模的思路。给出了三维建模的方法和流程,并利用AUTOCAD、3DMAX和PHOTOSHOP软件,制作出立交三维效果及动画效果,为立交造型方案设计及景观分折提供了有利条件。     

翻译中的文化因素

翻译是一种跨文化交际,它不仅是语言的转换,更是文化的转换,而东西方的文化既有共性又有个性,影响翻译的文化因素主要有：1,宗教信仰;2,生态环境;3,社会文化风俗;4,历史文化背景;5,物质生产劳动;6,政治制度．翻译不是纯粹的语言技巧问题,而是在这文化基础上的一种正确判断,选择的能力．在翻译实际操作中应具体问题具体分析,选择恰当的方法．