3D finite element mesh generation of complicated tooth model based on CT slices

An interactive three-dimensional finite element generation method is presented for modelling a multi-connected teeth and mandible structure. The tetrahedron is chosen as the basic element type due to its rigorous adaptability to structures with geometric complexities. The mesh generation is implemented by allocating two quadrangles in adjacent CT image slices to form a set of tetrahedrons. By examining all the possible allocations and their degradations, an algorithm is developed for interactive mesh generation, resulting in a series of tetrahedrons consistent with all the others without overlapping and spacing. The developed system was applied to a tooth-mandibular structure, generating a complicated 3D FEM model consisting of 4762 nodes and 18,534 tetrahedral elements with nine different materials. This 3D model was successfully used to evaluate different tooth restoration strategies, which proved the viability and effectiveness of the proposed method.     

E—mail营销研究

首先讨论了E-mail营销的产生和理论基础,然后分析了客户数据库的建立与使用,最后,对增强E-mail营销效果的对策进行了研究。     

分布式对象管理的几种常用技术

以丰富的分布式系统开发经验为基础,详细分析了传统和新兴的分布式对象技术,比较它们的优缺点,探索分布式对象管理的未来走向。     

基于80C196KC微控制器的晶闸管整流装置数字控制器的设计

介绍了以80C196KC微控制器为控制单元的晶闸整流装置的数字触发系统的硬件组成,包括同步信号的获取,整流电流的采样,显示,及脉冲发生电路和本系统的软件技术。     

基于Linux的守护“软件人”的设计与实现*

分析了“软件人”系统中“软件人”的组织结构与功能,详述了Linux操作系统下守护“软件人”的设计与实现,提出了一种基于分布式负载信息交互的负载平衡方法,并给出了部分关键数据结构与“软件人”迁移协商算法框架。     

基于软交换的集群媒体服务器的安全问题及其解决方案*

媒体服务器是NGN多媒体业务平台中的关键设备,NGN的安全至关重要。针对一种基于软交换集群媒体服务器的体系结构及其原型系统,详细分析了系统安全性,并给出了相应的解决方案。     

Virtual spectrophotometric measurements for biologically and physically based rendering

Published online: 18 September 2001     

Geometric Hermite interpolation for space curves

This paper considers the geometric Hermite interpolation for spacial curves by parametric quartic Bézier curve. In additon to position and tangent direction, the curvature vector is prescribed at each knot. We prove that under appropriate assumptions the interpolant exists locally with one degree of freedom. Moreover, we prove the interpolant is 6th order accurate.     

基于客户端GUI构件实例缓存技术的系统性能优化处理

随着 Ｗｅｂ技术的发展和普及,越来越多的应用软件是直接从 Ｗｅｂ服务器通过网络传递到客户端运行的。借鉴图像处理软件中采用的双缓存技术而提出的构件实例缓存技术在基于网络应用程序设计中的应用,将优化系统的性能。该文提出在客户端图形化用户界面的设计中的实例缓存技术,并针对应用程序运行的不同网络环境提出应用这项技术的不同策略,同时设计了实例缓存技术的应用模型。