陶瓷刀具模糊可靠性及其与刀具材料力学性能的关系

基于模糊数学和可靠性数学的基本理论 ,阐述了刀具模糊可靠性的基本概念和评价方法 ,并进一步应用于陶瓷刀具研究领域 ,建立了陶瓷刀具模糊可靠性与刀具材料力学性能的关系 ,从而使得不做或少做切削实验就能评价陶瓷刀具可靠性的设想成为可能     

A geometrical approach to computer-aided process planning for computer-controlled machine tools

This paper documents part of a research program which has been under way at the CIM Centre at Swinburne University of Technology since 1989. The purpose of the research program was to develop an open-architecture machine tool control system and then to see how that system could be used to change the distribution of traditional manufacturing design, planning and control functions. This paper examines one part of that research program and focuses on a methodology which could prove to be useful in the machine tool selection, cutter selection and cutter path generation phases of process planning for cutting operations on workpieces in computer-controlled machine tools.It is suggested that a configuration space transform be used for each cutter/machine tool combination to find the volume that the combination could remove from the uncut workpiece without removing any of the material that will form the final workpiece. A method of comparing these volumes from different combinations is then outlined. The output of this method is a reasonable sequence of machine tools and cutters. Path planning can then be carried out for each of the chosen combinations using a method similar to the one used to find the possible volume to be removed.Possible implementation techniques, and their limitations on existing computer hardware, are discussed and the most promising of these are identified, based upon some properties of configuration space transforms.     

移动网络手机实时监控系统的设计与实现

通过分析动力环境实时监控系统的实际需求,结合移动网络、J2ME、Java媒体框架等技术,提出了一个基于移动网络的手机实时监控系统的设计方案.涵盖了图像监控和数字监控两条通道,实现了视频监控、监控数据实时查询、告警和控制命令等功能.针对图像监控通道中高实时性的要求,提出了双缓冲多线程图像捕捉、自缓冲输入流机制、双播放器播放模式等多个创新方法对系统进行优化.最后结合系统在动力环境监控系统中应用案例,表明了系统的可行性和可靠性,且系统具有较高的性能.     

多组合设备的调度控制研究综述

在半导体芯片制造中越来越广泛使用多组合设备.本文介绍了多组合设备的结构配置、生产运行过程、调度控制问题的一般特征条件、应该满足的约束及周期性调度策略;分析了问题的复杂性因素.从多组合设备的结构特征、运行过程特征两方面分类综述了调度问题的建模、分析方法、调度算法及存在的问题,最后指出了未来的研究方向.     

基于Micro2440视觉处理平台的构建

采用Micro2440开发板和OV9650摄像头,成功获取了视频图像,并且能够对视频中的每一帧图像同步进行自定义的图像处理,其处理的结果同时能够在LCD上予以显示.实验结果证明该视觉处理平台具有良好的视觉处理特性,适合作为数字图像处理平台,为进一步的图像处理、功能扩展以及嵌入式应用创造了条件.     

Automatic 3D model reconstruction of cutting tools from a single camera

Collision detection by machining simulation requires the 3D models of rotating cutters. However, the 3D models of a cutter and holder are not always available. In this paper, a new method is proposed to design an automatic vision-based 3D modeling system, which is able to quickly reconstruct the 3D model of a cutter and holder when they are installed onto the spindle. Only a single camera is mounted on the machine tool to capture the image of the rotating cutter and holder. By viewing the rotating cutter and holder as an object of surface of revolution, the contour of the imaged cutter and holder can be used to reconstruct the 3D model as a stack of circular cross-sections. Then the complete generating function of the cutter and holder can be recovered from the cross-sections. Finally, the 3D model of the cutter is built by rotating the generating function around the spindle axis. The effectiveness and accuracy of the proposed method are verified by experiments on-machine using 12 kinds of cutters and holders, which can satisfy the requirement of collision detection.     

公选课《动画设计—Flash》教学的一点经验

高校公选课程的开设是培养大学生综合素质的重要渠道之一,《动画设计—Flash》以其生动鲜活、实用性强、易学易用的特点深受广大同学的欢迎。该文根据教学实践,从教学内容的安排、教学手段与方法、考核方式三个方面进行了阐述。     

HCS12X单片机的SD卡FAT文件系统读写设计

基于HCS12X单片机SPI模块读取Micro SD卡与SD卡,并解析SD卡上FAT文件系统以实现文件的读取与写入。测试证明,系统对FAT文件系统的读取稳定,误差小,速度较快。使用HCS12X类单片机对SD卡进行读取,在汽车智能设计和单片机调试方面有较高的应用价值。     

The use of ‘exploratory learning’ for supporting immersive learning in virtual environments

User interfaces are becoming more intuitive following the requirements of the individual learner and reinforcing the drive towards more personalised learning and greater learner autonomy. There are clearly a new set of challenges emerging for teaching practitioners that will have implications upon not just what is learned but importantly upon lesson planning. This paper explores these changes to teaching through a consideration of an exploratory learning model which allows practitioners to rethink how they teach in 3D and immersive spaces where learning sequences and experiences are choreographed to support peer interactions and exchanges. The ELM extends from Kolb’s experiential learning model to adapt the use of 3D applications, and provides examples from research and development projects to exemplify how the model works in practice. Teaching in these contexts provides less emphasis upon curriculum and more emphasis upon sequencing learning experiences, meta-reflection, peer assessment and group work.