An approach to integrating shape and biomedical attributes in vascular models

Computational models have been used widely in tissue engineering research and have proven to be powerful tools for bio-mechanical analysis (i.e., blood flow, growth models, drug delivery, etc). This paper focuses on developing higher-fidelity models for vascular structures and blood vessels that integrate computational shape representations with biomedical properties and features. Previous work in computer-aided vascular modeling comes from two communities. For those in biomedical imaging, the goal of past research has been to develop image understanding techniques for the interpretation of x-ray, magnetic resonance imaging (MRI), or other radiological data. These representations are predominantly discrete shape models that are not tied to physiological properties. The other corpus of existing work comes from those interested in developing physiological models for vascular growth and behavior based on bio-medical attributes. These models usually either have a highly simplified shape representation, or lack one entirely. Further, neither of these representations are suitable for the kind of interactive modeling required by tissue engineering applications.This paper aims to bridge these two approaches and develop a set of mathematical tools and algorithms for feature-based representation and computer-aided modeling of vascular trees for use in computer-aided tissue engineering applications. The paper offers a multi-scale representation based on swept volumes and a feature-based representation that can attribute the geometric representation with information about blood flow, pressure, and other biomedical properties. The paper shows how the resulting representation can be used as part of an overall approach for designing and visualizing vascular scaffolds. As a real-world example, we show how this computational model can be used to develop a tissue scaffold for liver tissue engineering. Such scaffolds may prove useful in a number of biomedical applications, including the growth of replacement tissue grafts and in vitro study of the pharmacological affects of new drugs on tissue cultures.     

智能化的产品设计环境

随着计算机全面引入到产品设计全过程中，形成了计算机化的产品设计环境。本文深入分析产品设计过程中各种活动的演变规律及其信息处理方法，基于产品设计过程的进行模型理论，提出了智能化的产品设计环境ＩＩＩＰＤＥ的总体构思，分析了系统结构和信息流程。该系统具有较强的适应性，对分布式协同设计环境的构架也有适用性。本文最后总结了智能化产品设计环境中涉及到的关键技术环节和有待进一步研究的问题。     

浅述城市规划管理信息系统

阐述了城市规划管理信息系统的内容及其建立的方法和步骤，以及其与管理人员构成和该系统的经济效益，并指出城市规划管理信息系统利用计算机技术，科学地现代化地优化了城市规划设计与城市规划管理，为了城市建设的科学发展应加大投入，跟上时代步伐，进入城市建设的计算机时代。     

线切割CAD/CAM软件的研究与实现

研究开发了功能较完备，具有自主版权的高速走丝切割加工CAD／CAM软件，分析了该软件系统的结构及特点，讨论了建立工艺参数库，尖角加工处理，电极丝自动偏移补偿，文件格式转换等软件功能开发中的关键技术。     

凸轮-连杆组合机构的优化设计

以最大压力角为最小做为优化目标，并采用坐标轮换法和黄金分割法等优化方法对书本打包机中的推书机构（凸轮－连杆组合机构）进行优化设计，从而使得机构确保运动的平衡性的前题下具有良好的传力性能，使设计结果更加合理。     

PLC顺控程序的计算机辅助设计

本文用C／C 语言研制了一个计算机辅助设计软件，可以自动设计PLC的SFC应用程序，并针对具体机型S7—200，利用其编程软件，将程序快速下载到PLC，极大地提高了效率。     

计算机在电阻炉设计中的应用

本文介绍了286/386型个人计算机在电阻炉计算机辅助设计中的应用,包括整体思路,数学模型的建立方法。还以连续式电阻炉为例编制了设计软件,详细介绍了该软件的功能和使用方法。本文提出的计算机辅助设计方法亦适用于其它工业电炉。     

CAD／CAPP并行集成理论及系统研究

并行工程作为一个新的设计哲理在工程实践中的实现手段不尽相同，本文中我们提出了ＣＡＤ／ＣＡＰＰ并行集成概念，并开发了原型系统ＣＥＣＡＤＰ，初步实现了一种并行设计的运行模式。     

计算机专业CAD课程的深化实践

在现行的社会技术人才的高度需求下,CAD课程的教学任务更显得意义重大。探讨如何提高教学效率．培养学生的技术应用能力、职业实践能力和创新能力,缩短计算机专业学生cAI）技术应用与单位需求的差距而进行相应的有效实用教学。     

混合集总—分布参数微波功率分配器的机助设计

在本文中,将微波功率分配器看做用多个两端口网络构成的多端口匹配网络,用集总与分布参数元件混合组成的模块来综合这种网络,从而得到了一种新型的混合集中分布参数微波功率分配器及其机助设计方法。