Collision and intersection detection of two ruled surfaces using bracket method

Collision and intersection detection of surfaces is an important problem in computer graphics and robotic engineering. A key idea of our paper is to use the bracket method to derive the necessary and sufficient conditions for the collision of two ruled surfaces. Then the numerical intersection curve can be characterized. The cases for two bounded ruled surfaces are also discussed.     

The model-based human body motion analysis system

In this paper, we propose a model-based method to analyze the human walking motion. This system consists of three phases: the preprocessing phase, the model construction phase, and the motion analysis phase. In the experimental results, we show that our system not only analyzes the motion characteristics of the human body, but also recognizes the motion type of the input image sequences. Finally, the synthesized motion sequences are illustrated for verification. The major contributions of this research are: (1) developing a skeleton-based method to analyze the human motion; (2) using Hidden Markov Model (HMM) and posture patterns to describe the motion type.     

The geometry of flex tangents to a cubic curve and its parameterizations

We show how the study of the geometry of the nine flex tangents to a cubic produces pseudo-parameterizations, including the ones given by Icart, Kammerer, Lercier, Renault and Farashahi, and infinitely many new ones.     

工程设计质量检查问题解析之给水排水篇

通过施工图质量检查工作，针对给水排水专业出现的问题，进行解析并提出了正确的做法。     

基于三维实体造型技术的机械制图教学体系的思考

针对三维实体设计的特点,分析机械制图课程学习三维实体造型技术的必要性及三维实体造型技术对机械制图教学的影响,指出应以三维实体造型技术构建全新的机械制图课程教学体系.     

CSP连铸结晶器液位控制系统

介绍珠钢连铸采用Co60为放射源的结晶器液位控制系统配置、控制方式和控制算法．     

武钢钢帘线用盘条的发展现状及营销分析

随着中国汽车工业的迅猛发展,子午线轮胎用材钢帘线盘条的需求量日趋扩大,同时市场竞争也更加激烈。利用五力模型(5种竞争力模型)理论对其进行了分析,提出了武钢发展对策。     

《机械制图》作业网络绘图工具开发研究

结合机械制图课网络教学特点，利用ActiveX网络功能开发了两套机制作业网上绘图教学软件。该软件实用性强，自带智能化作业批改功能，为机械制图课远程教学中网络绘图工具的开发提供了新的思路。     

板式塔总装图参数化绘图研究

板式塔总装图的绘制是板式塔设计的主要工作之一，工作量大。通过对板式塔总体结构特点及其视图表示法的分析总结，结合行业标准及有关规定，将其总装图划分为几种规范化的组件，包括塔体、塔板及开孔结构等部分。根据各组件及总体表达方案的特点建立组件对应的子程序库、数据库、总装图数据文件及相关规则库，在此基础上，提出了板式塔总装图参数化绘图方法，并借助ＡＵＴＯＬＩＳＰ语言在ＡＵＴＯＣＡＤ１２环境中编程实现，提高绘图效率约２０倍。由于板式塔总装图的复杂性，未能解决文字及符号等的自动标注，有待完善。