参数曲面导矢界估计及其在曲面绘制中的应用

目的是改进参数曲面的绘制效率。采用的方法是在参数曲线导矢界的基础上，进一步提出了3次参数曲面导矢界的公式。基于这些公式，能够较好地解决了参数曲面绘制算法过程中出现的重复绘制的问题和不连续的问题，进一步提高了曲面绘制的效果和效率。     

A bound on the distance between Loop subdivision surface and its control mesh

By means of direct analysis of the connection between Loop subdivision surface and its control mesh and the computation of the basis functions,we obtain a bound on the distance between Loop subdivision surface patch and its control mesh.The bound can be used to compute the numbers of subdivision for a given tolerance.Finally,two examples are listed in this paper to demonstrate the applications of the bound.     

The intersection of a bicubic Bézier patch and a plane

Let S be an arbitrarily given bicubic Bézier patch and P an arbitrarily given plane. In this paper, a necessary and sufficient condition for S ∩ P to be non-empty is given, and some properties of S ∩ P, if non-empty, are included. Furthermore an efficient and robust algorithm for finding S ∩ P is described, and many interesting examples are shown.     

三次Hermite插值曲线的细化优化

在给定端点及其切矢方向的条件下,通过在相邻两节点之间插入一个中间节点,研究三次Hermite插值曲线的优化问题．如果以与曲率有关的二阶导数为目标,证明插入节点与不插入节点的情形是一样的,体现三次Hermite插值曲线的一种特性．如果以与挠率有关的三阶导数为目标,给出优化三次Hermite曲线的计算公式,从而提出一种新的曲线构造方法．实例表明了方法的有效性．     

旋转圆锥网格及其在玻璃/钢结构中的应用

圆锥网格是计算机辅助建筑设计中一类新的平面四边形网格,具有良好的等距性质,非常适用于玻璃/钢结构,而旋转曲面是建筑设计中的常用形状.通过引入旋转圆锥网格的概念,并利用圆锥网格的定义,给出了构造旋转圆锥网格的简单方法.证明了只在旋转曲面r(u,v)=(f(u)cosv,f(u)sinv,g(u))的v参数方向进行均匀分割,而在U参数方向进行任意分割,则所产生的平面四边形网格为圆锥网格;并研究了旋转曲面为圆锥曲面和圆柱曲面的特殊情况;最后给出了基于旋转圆锥网格的玻璃结构造型实例.该方法简单易行,对计算机辅助建筑设计中的玻璃/钢结构造型有一定的实际应用价值.     

An upper bound for the distance between a zero and a critical point of a solution of a second order linear differential equation

This paper presents an upper bound for the distance between a zero and a critical point of a solution of the second order linear differential equation (p(x)y^′)^′+q(x)y(x)=0, with p(x),q(x)>0. It also compares it with previous results.     

On the interpolation of a function on a bounded domain by its traces on parametric hypersurfaces

We consider the problem of interpolating a multivariable function defined on a bounded domain using its traces on parametric hypersurfaces. Our approach is based on the theory of operator polynomial interpolation. We construct the corresponding operator interpolation polynomial for a given function and analyse in detail particular two- and three-dimensional cases. Numerical examples presented in the paper show the flexibility of the proposed approach.     

The Implementation Methods for Computer Aided Design and Analysis on Color-Woven Fabrics

Methods for computer aided design and analysis on color-woven fabrics are presented. The relation of color pattern, colored warp, colored weft and the model for regular weave texture are given based on their formative principle. Some efficient algorithms are developed to determine the color order of warp and weft threads which yields a given color pattern and regular weave texture. Finally, the design system structure and data process flowing are introduced.     

Tight upper bound on the number of edges in a bipartite K3,3-free or K5-free graph with an application

We show that an n-vertex bipartite K_3,3-free graph with n?3 has at most 2n−4 edges and that an n-vertex bipartite K₅-free graph with n?5 has at most 3n−9 edges. These bounds are also tight. We then use the bound on the number of edges in a K_3,3-free graph to extend two known NC algorithms for planar graphs to K_3,3-free graphs.     

球谐函数在蛋白质分子匹配和对接中的应用

本文将球谐函数应用在分子表面模拟上,以解决生物大分子(蛋白质)与生物大分子(蛋白质)之间的对接(dock),为药物分子设计的研究奠定理论基础。     

计算机辅助设计在工业设计的应用状况及发展前景

在工业设计进行的流程中,计算机辅助设计悄然的穿插在每一个相对独立的主题活动之中.从一个完整的设计流程审视,计算机辅助设计的作用显而易见.它在设计流程数据管理,产品效果表现以及计算机辅助模型制作等广泛应用,发挥了工具化的作用.在应用过程中,促进了其自身的发展和工业设计的发展.     

连续反应动力学的计算及过程的计算机模拟

在连续反应中,速率系数的比值很大程度上决定了中间产物浓度的走向,并由此引出了一个重要的方法：稳态近似法。微软公司推出的可视化编程语言Visual Basic提供了强大的计算与绘图功能,作者利用它研制了一级连续反应动力学的模拟程序。该程序能够计算出参与反应的各个物质的浓度,并且能够生动和直观地演示出各个物质的浓度随着反应的进行而发生的变化,从而使初学者进一步深刻理解一级连续反应和掌握稳态近似法的理论来源。     

对普通高校计算机程序设计教学的思考与实践

针对现有计算机程序设计教学中存在于学生和教师的部分问题，文章从程序设计教学的教学内容和方法等方面提出了一些可行的意见和建议，以优化整体教学效果。     

红外图像型测温中距离与像素间定量关系的研究

在研究了红外测温理论的基础上,通过黑体实验得到“温度一像素”和“像素一距离”曲线,对实验数据进行挖掘和处理后,建立了一种与距离秀关的红外图像型测温方法,并给出了系统的实际应用模型。实验证明,该模型能够满足实际的测温精度要求。     

Kinematic compatibility between the body and a mock spacesuit during basic upper body motions

In this study, a novel conceptual method was tested to study the kinematic mismatch between the body motion of an occupant with respect to a rigid suit. It was hypothesized that differences between body and suit motion would require extra body movement to achieve the desired suit motion. To quantify the mismatch in kinematics, mock upper body suits with an open structure were used in conjunction with a marker-based motion capture system. A 3D motion modeling software was used to determine the range of motion of the suit and body segments of nine participants performing seven basic arm and trunk motions. In general, range of motion of the body segment was found to be higher than the corresponding suit segment range of motion. Differences in range of motion of up to 21.3% were found between corresponding body and suit segments, and significance was found in five of the seven motions.     

基于计算机技术的设计艺术基础课程的思考与改革

目前,我国的设计艺术类学科教育出现停滞不前的局面,与飞速发展的设计理论和实践相比相对滞后。由此,本课题引入计算机技术,以开拓学生思维,培养学生发现创意元素的能力,帮助学生形成现代设计观念和审美意识,提高整体的审美水平和对艺术的理解为目的。针对设计艺术基础课程中的平面设计基础课程的设置提出了改革的主要方向。     

基于信息化业务的高职计算机网络教学设计与实践

为探索一条既适合企业信息化建设需要,又符合高职教育特点的计算机网络人才培养途径,文章提出一种基于信息化业务的计算机网络课程教学方法,对如何引入信息化业务进行了研究和探讨,并通过具体案例描述了教学设计和实施过程。     

一种供电收费管理系统软件的设计与实现

本文围绕供电收费管理的特点,介绍了一种主要使用ＶＦＰ编写的供电收费管理软件 的设计思想和具体的实现方法。     

儒家“中庸”思想对中国现代设计的影响

当今的艺术与设计已步入了一个包罗万象的完全开放状态,它的丰富包容、赏心悦目是以前所无法比拟的。不可否认,它确实为艺术家和设计师提供了无比广阔的舞台,但它同时也对艺术家和设计师的思想、艺术表现手法、审美标准带来了前所未有的冲击。尤其是作为走在社会前沿的设计师更不可避免地陷入了深深的困惑:面对设计艺术的种种现状,我们何去何从?是继续走模仿西方现代设计的道路,还是走本土化道路,抑或是中西交融的创新之路?处于这种境地,我以为儒家的中庸思想或许会给我们种种启示,帮助我们走出困境。