直升机交互式桨叶振动调整仿真研究

为解决目前机务维修培训中存在的物理样机难以满足需求的问题,以实际机务维修工作中旋翼振动调整方法为参考,提出在虚拟维修训练系统的基础上实现受训人员对虚拟样机旋翼桨叶进行振动调整仿真操作,以期达到训练目的;根据非沉浸式虚拟维修训练系统的特点设计交互仿真操作逻辑,确定仿真操作步骤,分析座舱振动可视化表示方法,专用虚拟样机的构建方法以及虚拟仪器的实现方式和数据组织结构形式,并将该仿真实验以模块化形式添加到虚拟维修训练系统中,满足拆装条件下对虚拟样机的交互操作需求;最后以欧直松鼠直升机虚拟样机旋翼振动调整方法为例验证该操作仿真逻辑的可用性。     

舰船动力装置虚拟维修训练软件的开发

随着舰船动力装置的不断复杂化,其维修训练成为装备使用维护过程中的一大难题.针对传统维修训练模式受装备数最限制、开发周期长,投资大的特点,在分析虚拟维修训练系统发展现状及其功能需求的基础上,以CATIA为建模平台,以VIRTOOLS为三维交互引擎,以ACCESS为后台数据库平台,以.NET为系统集成平台,研究并开发了舰船动力装置虚拟维修训练软件.经实践验证表明,软件不仅能够满足舰船动力装置维修圳练任务的需要,缩短开发周期,节约训练经费,同时能够用作一个通用的虚拟维修洲练平台.     

导弹装备虚拟维修训练系统通用平台

针对当前导弹装备虚拟维修训练系统开发只针对单一型号和专用功能、效率低、开放性和通用性差的问题,对基于资源重用性、系统通用性的导弹装备虚拟维修训练通用平台进行研究,阐述通用平台包含的视景仿真、故障机理建模与管理、人机交互、维修任务控制4类模块及2种典型训练模式,探讨通用平台设计中的4项关键技术。介绍通用平台的总体结构设计和基于EON Studio开发的虚拟维修训练原型系统。     

基于Pro/E的虚拟拆装系统

为实现快速、有效、低成本的部队维修训练,通过分析虚拟拆装系统的需求,构建基于Pro/E的虚拟拆装系统,其中包括I/O设备、虚拟拆装环境管理、数据库和性能测试模块,给出与I/O设备交互、虚拟拆装环境管理等系统实现的关键技术,通过Pro/E二次开发验证该系统的可行性和有效性。     

基于OSG动车组虚拟维修训练系统研究与实现

研究动车组虚拟维修培训系统,针对提高人员维修和培训水平,为了缩短大型复杂产品动车组维修的培训周期,节约训练经费,传统虚拟维修训练系统实时绘制大型模型能力弱,表达维修对象信息不直观等的问题,为解决上述问题,提出进一步用仿真技术,开发了动车组维修训练仿真系统,构建了维修训练仿真系统的框架、层次信息模型,基于OpenSceneGraph三维引擎,采用了产品装配树的建立、大型模型渲染优化、交互信息显示和拆装仿真等关键技术,并组成系统进行仿真.仿真结果表明系统设计的可行性,能够满足大型复杂产品虚拟维修应用的要求.     

基于VR的起落架维修教学平台

本文提出以VR技术制造出的虚拟教学训练环境来改善维修人员的实操水平。通过对于3dsMAX、Unity3D、CAD的学习与运用与整合,创造出1:1的虚拟模型、工具以及环境,实现VR维修平台模拟教学演示以及自主操作功能,达到学员能够观看教程演示后,能够进行专项拆装训练的目的。本虚拟拆装维修教学让学员可以在自主学习中,掌握飞行器部件装配过程,为实践拆装操作奠定基础。     

基于蚁群算法的虚拟维修环境布局规划方法

虚拟维修拆装过程是虚拟维修的重要组成部分。现阶段拆装过程中产生的零部件一般都只是简单的以爆炸效果在虚拟三维空间环境中显示,然而当部件复杂,拆装后零部件较多时,这种显示效果容易产生视角上的重叠、混乱。为了解决虚拟维修拆装环境中的零部件在三维空间的布局问题,应用空间规划对零部件进行拆装顺序分类,将复杂三维布局转化为二维布局,同时使虚拟环境空间更具层次感。在运用定位法进行二维布局优化时,结合蚁群算法进行布局顺序寻优,提高了布局优化质量。最后通过对某航空发动机高压压气机虚拟拆装零部件布局进行仿真分析表明,提出的方法是可行的。     

装备维修仿真训练系统设计与实现

针对实装维修训练成本高和效益低的问题,设计了具有三维交互功能的基于虚拟维修训练的维修仿真训练系统。仿真训练系统集装备学习、训练、考核和管理功能于一体,系统采用了C/S和B/S相结合的体系结构,应用软件采用了开放性和灵活性较高的分层软件体系结构。虚拟维修训练系统采用微软最新的基于Direct 3D的集成开发环境XNA技术和C#语言实现,给出了虚拟维修训练系统实现流程。     

装备虚拟维修培训系统设计与实现

针对目前部队及相关军事院校对武器装备维修培训的需求,结合虚拟现实技术的发展现状、系统结构特征设计了基于虚拟维修技术的装备维修培训系统总体方案。对其中的三维模型设计、维修过程设计、碰撞检测、交互方式等关键技术进行了分析与研究,实现了角色管理、虚拟维修演示与训练、维修信息记录等功能,涵盖学习、训练、评估环节。最后以某武器装置为对象对该系统进行实际应用,结果证明可以满足用户在装备维修训练领域的需求,可有效提高装备维修效率,为装备维修培训提供了新的可行方法。     

某50MW汽轮机虚拟维修训练系统设计与实现

立足于某汽轮机厂维修需求,针对大型汽轮机设备维修成本高、培养维修人员费用高、周期长的问题,提出了实用性较强的汽轮机虚拟维修训练系统设计方法。该方法在Petri网进行维修序列生成的基础上,利用先进的三维建模软件和VirtoolsVR平台以及C＋＋语言,搭建针对50MW汽轮机开发虚拟维修训练系统。     

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。     

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     

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.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.