基于MultiGen的虚拟场景真实感研究

虚拟校园是数字城市的缩影.以北京交通大学的真实校园场景为研究对象,采用模块化、层次结构和纹理映射技术相融合的方法,通过运用实时可视化三维建模软件系统MultiGen Greator进行建模,创建了较为逼真的校园虚拟场景模型,并从数据库结构和组成模型的面片数两方面对其进行了优化,最后利用仿真系统Vega实现了校园虚拟场景的驱动显示.对于校园虚拟现实系统关键技术的研究与实现成为完成逼真合理的大规模虚拟场景的基础.     

基于MultiGen的虚拟场景真实感研究

虚拟校园是数字城市的缩影。以北京交通大学的真实校园场景为研究对象,采用模块化、层次结构和纹理映射技术相融合的方法,通过运用实时可视化三维建模软件系统MultiGen Creator进行建模,创建了较为逼真的校园虚拟场景模型,并从数据库结构和组成模型的面片数两方面对其进行了优化,最后利用仿真系统Vega实现了校园虚拟场景的驱动显示。对于校园虚拟现实系统关键技术的研究与实现成为完成逼真合理的大规模虚拟场景的基础。     

MultiGen Creator/Vega在高速列车运行视景仿真系统中的应用

随着计算机软、硬件技术的迅速发展,利用三维视景仿真技术动态描述列车运行仿真过程成为一个新的发展方向。简要介绍了开发工具Multigen Creator和Vega的特点。研究了利用Creator和Vega实现视景仿真的总过程。结合高速列车运行实例说明了利用Multigen Creator建立铁路三维模型的主要思路和过程,并详细分析了建模过程中的难点问题及相应的办法;还研究了利用Vega实现实时驱动的步骤和方法。仿真结果表明,基于Multigen Creator和Vega的高速列车运行实时视景仿真系统取得了良好的效果。     

基于Vega的视景仿真软件的设计与开发

计算机仿真技术近几年得到了高速发展,其应用已经涉及了生产和生活的各个方面,在军事领域应用更为广泛.介绍了实现三维场景驱动时的几个关键技术,开发了一个导弹虚拟操作训练仿真应用程序,用Multigen Creator建立了虚拟战场环境,采用Vega仿真引擎来实现场景驱动,解决了某型导弹武器分布交互式作战仿真中的部分关键技术,所开发的视景仿真系统具有很强的可扩展性和兼容性.     

基于Multigen的无人机任务飞行仿真系统

介绍基于Multigen仿真软件Multigen Creator, Creator Terrain Studio和Vega Prime的无人机任务飞行仿真系统,在Vega Prime中建立无人机的飞行控制运动函数,实现无人机模型在虚拟仿真场景中的六自由度运动。基于.NET 2003环境下多线程编程技术和SBS网络数据传输,实现该系统的实时应用。仿真结果表明该系统能较好地模拟无人机作战飞行任务。     

基于MultiGen和Vega的城市场景仿真技术

虚拟现实技术是近几年来计算机图形学的研究热点.论文针对基于MultiGen Creator/Vega的虚拟场景仿真技术开展研究,介绍了三维视景仿真系统所涉及的关键技术、虚拟场景建模方法,以及在Vega软件环境中进行二次开发的技术,实现了虚拟场景中的视景漫游.实现结果表明,采用该技术可以满足视景仿真的实时要求.     

空中机动目标三维视景仿真系统研究

本文采用Multigen Creator/Vega三维视景仿真机制,对空中机动目标三维视景仿真系统进行场景建模和场景驱动.从模型的几何结构和表面纹理着手,优化模型数据库;利用Vega路径定义模块规划空中机动目标飞行路径,合理设置每个路径控制点的姿态和速度,模拟加减速、侧翻、跃升、俯冲等一系列飞行动作;选取静态视点定位方式;并为场景添加无限光源和链式云,增加场景的生动性.仿真结果表明该系统能够充分的表达空中机动目标的运动特点,具有很好的实用价值.     

矿山视景仿真技术探讨

结合建模软件Multigen Creator Pro及在平顶山矿区承担的实际科研项目,研究了矿山三维场景建立的方法,成功地建立了视觉效果较好的矿山三维场景。并利用仿真软件Vega Prime和组件GIS--MapObjects,对三维场景的渲染、驱动和二维三维互动进行了设计和开发,取得了良好的效果。     

基于虚拟现实二甲醚工艺流程模拟及监控系统

为模拟二甲醚生产工艺流程,建立虚拟现实模拟及监控平台。通过Multigen Creator、3Dmax构建二甲醚化工设备三维模型,利用视景开发软件Vega Prime进行模型管理。利用MATLAB/Smulink及程序对二甲醚各生产化工单元模拟与控制,并通过VC++接口函数建立与Vega Prime实时数据传输,驱动虚拟现实场景中的三维化工设备对象。实现二甲醚生产工艺流程实时虚拟模拟与监控。该系统经过对实际生产过程数据模拟及验证,可为二甲醚工艺流程模拟及监控仿真培训提供高效、实用支持。     

基于Creator和vega prime的虚拟校园漫游系统的研究

该文以Multigen Creator3.2为主的多种工具进行场景建模;在场景驱动上选择Vega Prime 2.0,以VC.NET为平台,并采用多线程技术,结合arcgis矢量化工具,开发了一个虚拟校园漫游系统,实现了自动和任意漫游、碰撞检测、二维地图导航、场景汉字显示等功能。该研究对学校的环境规划、资源管理可提供先进的技术手段,对其他虚拟地理环境的构建以及功能实现也具有重要的参考和借鉴意义。     

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.