刮板输送机结构参数化建模研究

针对刮板输送机结构设计重复率高、效率低的问题,基于Pro/E 5.0三维建模软件实现了刮板输送机关键部件及复杂装配体的参数化建模。刮板输送机关键部件的参数化建模主要包括三维模型创建、设计参数确定、关系设定等3个步骤,以驱动链轮参数化建模为例介绍了关键部件参数化建模过程。刮板输送机复杂装配体的参数化建模基于Pro/Toolkit二次开发技术和Visual Studio 2008实现,以刮板输送机中部槽参数化建模为例,介绍了复杂装配体的参数化建模及虚拟装配过程。通过修改重要的几何参数实现对刮板输送机关键部件及装配体的快速建立、修改和精确造型,为刮板输送机结构优化提供了基础。     

榴弹交互式结构参数化仿真设计的研究

详细介绍了基于约束关系的参数化设计技术及Pro/E二次开发技术,使用Visual C 6.0及Pro/Toolkit开发工具.对Pro/E进行二次开发,研究开发了交互式榴弹结构参数化仿真设计系统.该系统通过对各种实践经验资料及同类型弹丸结构分析的基础上,在Pro/E下建立标准榴弹模型库,并提取驱动参数、建立驱动参数约束方程.使用户即榴弹设计者在Pro/E环境下通过修改主要设计参数及局部设计参数,得到系列弹丸或新型弹丸,使其更能满足某一方面的战术技术要求,为研制榴弹快速化制造系统奠定了基础.     

基于MFC的Pro/E标准件库的研究与开发

三维标准零件库的建立对提高企业的设计效率和质量具有重要的意义。通过对标准件库的自动检索和参数化仿真设计,生成设计人员所希望的三维模型。该文分析了对三维辅助设计软件Pro／E进行二次开发的各种方案,着重研究了基于MFC的Pro／TOOLKIT开发技术,探讨并解决了MFC应用程序集成、数据库建立、ODBC数据库访问技术、参数化仿真设计技术以及Pro／E菜单定制等关键问题。开发实例给出了用可视化编程语言VC＋＋进行二次开发,设计并实现了一个实用的Pro／E三维标准零件库系统。     

基于Pro/E的机械产品设计

基于Pro/E特征建模、参数化、全数据相关的特点,不仅能实现零部件的参数化实体建模,也可以方便地建立从三维模型到二维工程图的转换,有效地缩短设计时间,提高设计效率与质量。通过对Pro/E特点的讨论,结合台式钻床产品设计实例,论述了Pro/E在机械产品设计中的应用。     

利用Visual C++开发Pro/ENGINEER三维标准模架库

从提高产品设计效率和质量出发,探讨了参数化设计功能和Pro/ENGINEER Wildfire环境下三维模型参数化设计的实现策略和途径,分析了基于Pro/TOOLKIT二次开发的三维标准模架库参数化设计的过程,并给出了应用实例。     

基于虚拟维修系统的配件模型实时移动方法

给出Pro/E中的3种坐标系以及配件在Pro/E中的位姿矩阵。研究配件模型在各种坐标系下的位姿矩阵变换,分析基于鼠标控制的模型实时移动方法。以Pro/Toolkit为工具,对Pro/E进行二次开发,在Pro/E中实现配件的实时移动,为构建虚拟维修系统提供技术支持。     

基于Pro/E的远程零件参数化设计系统研究

提出了一种远程设计机械零部件的新方案.利用VC+ +对Pro/E进行二次开发,将开发的程序封装成COM组件,利用Pro/E进行参数化建模,通过ASP技术调用COM组件实现远程参数化设计.以斜齿圆柱齿轮为例说明机械零部件远程设计系统的实现过程.     

使用Pro/Engineer二次开发技术自动建模研究

介绍了几种Pro/Engineer二次开发方法，深入研究了用户自定义特征和特征元素树两种建模方法，并给出了使用Pro/Toolkit二次开发包融合这两种方法实现参数化自动建模的一个程序示例。     

基于Pro／E的机械产品设计

基于Pro／E特征建模、参数化、全数据相关的特点,不仅能实现零部件的参数化实体建模,也可以方便地建立从三维模型到二维工程图的转换,有效地缩短设计时间,提高设计效率与质量。通过对Pro／E特点的讨论,结合台式钻床产品设计实例,论述了Pro／E在机械产品设计中的应用。     

基于虚拟样机技术的铁路货车轴端电机结构设计

介绍了虚拟样机技术和Pro/E 软件,描述了铁路货车轴端电机的结构和功 能特点及其虚拟样机模型的三维设计流程。讲述了模块化理念和并行设计方法在轴端电机总 体设计中的应用,并详细描述了参数化设计方法在轴端电机详细设计中的应用,主要包括零 部件尺寸参数化、装配约束参数化及Pro/E 提供的“外部复制几何”和“使用参照”两种参数化 工具。以永磁体厚度作参数化变量为例,介绍了多学科分析在轴端电机结构设计中的作用。 通过铁路货车轴端电机结构设计的实践表明：先进的三维设计技术和卓越的多学科分析方法 是基于虚拟样机技术的产品结构设计的重要工具和组成部分,能有效缩短设计周期、减少设 计成本,并能保证产品满足使用者的需求。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.