基于AR技术的弹射救生模拟训练系统

为满足弹射救生装置教学训练的需求,利用增强现实技术构建了弹射救生模拟训练装置.通过分析弹射救生装置的工作过程,确定了模拟训练装置的工作需求,并以此为基础搭建了硬件平台,设计了弹射救生模拟训练软件工作流程,以还原弹射救生系统的工作过程.为解决视景驱动和载荷感知等技术难题,分析了弹射过程中弹射上升、弹射离机阶段的视景特点和...     

OpenGL在弹射救生过程可视化仿真中的应用

该文根据弹射救生系统的实际工作过程,在VC＋＋编程环境下利用OpenGL开发工具和三维建模软件开发了仿真软件,实现了弹射救生过程的可视化,用于在数值计算结果的驱动下演示弹射救生过程,辅助数学模型的验证与改进,分析弹射系统性能以及指导座椅的改进。该文采用粒子系统模拟椅箭火焰,建立了观察者视角和飞行员视角,并根据过载值同飞行员黑视症状的关系实现了飞行员视角下的黑视效果模拟,再现飞行员在弹射过程中的视场。这些方法改善了可视化仿真软件中虚拟场景的真实感,增强了演示效果。     

弹射救生系统通用模块化仿真模型

工作于应急离机状态的弹射救生装置是一个复杂的动态系统,其工作环境复杂、不确定因素多。如何利用仿真技术来研究系统的动态特性一直是仿真工作的难点。该文提出了一种在弹射救生仿真通用平台上利用系统建模技术,将弹射救生划分为三个阶段,分阶段建立模型,复用此算法模型,通过各模块输出,输人变量名的连接方式,建立弹射救生仿真模型。针对不同型号的弹射救生仿真,只需要建立和修改各模块的控制模式类即可完成整个建模过程,不需要用户编制和修改算法源程序,并在仿真试验研究的基础上提出了弹射救生系统仿真的今后发展的重点。     

基于Vega的弹射救生可视化仿真系统研究

工作于应急离机状态的弹射救生装置是一个复杂的动态系统,其工作环境复杂、不确定因素多。如何利用仿真技术来研究系统的动态特性一直是仿真工作的难点。提出了一种基于面向对象的连续系统仿真方法,并将连续系统仿真和基于Vega的视景仿真相结合共同构成可视化仿真系统。各对象成员负责自己的初始化,并根据全局仿真类传递的控制信息和自己封装的数学模型完成自身状态的转换。仿真类根据系统状态来控制完成数据的交换,在获得系统仿真数据的同时获得直观的可视化结果。     

基于数据驱动的氚粒子扩散三维仿真系统

为了对氚安全包容系统中氚扩散数据的变化进行直观分析,实现氚扩散的计算数据在空间中的三维可视化,本文基于Unity3D引擎研发了氚安全包容三维虚拟仿真系统.本系统基于计算数据驱动粒子系统对氚的输运及泄漏扩散过程进行三维仿真,以中国聚变工程实验堆CFETR的排灰处理系统(TEP)作为案例,模拟了排灰处理系统中氚的输运及渗透...     

无人机三维视景仿真系统实现

无人机传统地面站系统数据回显主要采用二维数字和图表曲线形式,操作人员不能对在三维空间内飞行的无人机的飞行状态有一个直观的感受。为了配合无人机地面站操作系统,以某新型无人机为应用背景,结合虚拟现实技术的相关理论,论述了在无人机地面站系统上加入三维视景部分。该系统在无人机飞行仿真的基础上,基于Creator和Vega软件,构建了无人机弹射起飞、巡航飞行的场景,实时动态地再现了无人机飞行的全过程,最后给出了系统的实施效果,仿真效果理想。     

嵌入式弹射座椅程控器测试系统研究

程控器是可靠完成弹射救生过程的核心控制部件,为了确保其可靠工作,使之处于良好的工作状态,提高系统的弹射救生效能,设计了一种能够完成程控器检测保障的系统;通过分析程控器的工作原理确定了测试系统整体方案,详细论述了硬件电路和软件的设计过程,整套设备操作简便,性能可靠,对于提高部队对弹射救生装备的维护保障水平,具有十分重要的意义;实验结果表明,关键参数的检测准确度可达97%以上。     

防区外导弹攻防对抗可视化仿真研究

防区外导弹攻防对抗可视化仿真系统是防区外导弹攻防对抗仿真分析系统的一个重要组成部分,可以实时呈现三维攻防对抗战场态势,是虚拟现实技术的重要应用.针对防区外导弹攻防对抗系统的特点,基于Creatar和Vega视景开发的一般过程,采用Cmator建立了各个仿真实体的三维模型以及地形等环境模型,并采用Vega进行了视景仿真系统的驱动,完成了空地远程防区外导弹攻防对抗可视化仿真系统,根据攻防对抗推进过程,实时呈现三维攻防对抗战场态势,给仿真试验者形象直观的感觉.结果表明视景仿真系统模型准确,三维视景逼真,并具有良好的实时性和可控性,很好地再现了防区外导弹攻防对抗过程.     

火箭橇弹射救生试验测试技术现状及发展趋势

通过查阅大量国内外飞机弹射救生文献资料和实施多次火箭橇弹射救生通道清理试验,对火箭橇弹射救生试验测试技术进行了系统梳理,从光学图像测试和力学测试这2个方面对通道清理、座椅弹射、氧气供给、人-椅分离、乘伞下降和安全着陆这6个试验分系统凝练试验测试内容,并按测试对象进行相应测试方法介绍,提出未来火箭橇弹射救生试验测试将朝着火箭橇平台高超声速试验能力、飞机变姿态试验和测试系统智能安全小型化的方向发展。     

虚拟地空战场通用视景仿真软件系统的设计

针对地空战场仿真的三维演示需求,基于高层三维图形开发环境设计了一套通用的视景仿真软件系统,适应于实时数据、人工规划路径等多种仿真驱动形式。使用MultiGenCreator建立了三维武器实体和地景模型;基于Vega仿真软件环境开发天空、地面背景和战场特效;利用大规模地形管理技术解决计算机对战场大地形实时处理能力不足的缺陷;通过设计粒子系统模拟了各种复杂的场景特效;利用C++编程,调用VegaAPI函数,开发了视景仿真程序。开发和应用结果表明,该系统灵活通用,效果生动,并且比以往直接基于OpenGL图形库开发的视景仿真软件提高了画面逼真度,缩短了开发周期。     

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。     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。