基于MultiGen Creator的纹理贴图方法

纹理贴图是三维仿真技术中实体建模部分的重要环节之一.在介绍了开发三维虚拟仿真系统的一般过程的基础上,研究了基于MultiGen Creator的纹理贴图方法.从纹理准备、纹理映射、效果预览等3个方面,给出了纹理贴图的具体过程,具有较强的可操作性,为三维虚拟仿真系统的快速研发提供了参考.     

基于ArcGlobe 的三维数字校园建模与仿真

数字校园是数字城市的缩影,是虚拟校园建设的支撑平台。在综合分析现 有三维数字校园建设的基础上,以山东科技大学青岛校区为例,引入ArcGlobe 软件,讨论 了数字校园建设的数据来源与处理方法、三维校园仿真的技术流程、不同起伏度的地面三维 模型的构建方法、地物景观模型的构建技术等。给出了三维校园仿真的具体实现方法,采用 LOD 和动态纹理匹配技术提高了三维建筑物加载和绘制的速度。论文给出的数字校园仿真 与建模的方法对正在开展的数字校园与数字城市建设具有较强的指导意义。     

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OpenGL的虚拟校园漫游系统的设计与实现

介绍了虚拟校园漫游系统的设计与开发技术,包括:OpenGL绘图窗口的创建;实体建模;纹理设置和贴图;界面和树的实现;虚拟仿真--利用VC 6.0开发平台,编制程序实现虚拟校园的漫游.该系统可以用于校园三维漫游、校园管理、校园规划等领域.     

MultiGen Creator建模技术的优化与实现

为了提高视景仿真系统的实时性能,降低系统资源开销,研究了MultiGen Creator三维虚拟场景建模关键技术,给出了Creator建模的详细实施过程,在虚拟校园漫游系统的开发中采用了三维虚拟场景建模的综合优化技术和方法,提高了系统的实时渲染响应速度。项目运行结果表明,优化建模技术使得三维模型数据读取迅速,仿真效果真实流畅。     

大面积三维地形生成和显示技术及实现

大面积三维地形的生成与显示是军事仿真视景系统开发的难点问题.本文研究了解决此问题的关键技术,包括LOD、纹理映射、分页调度策略和大地形数据库管理;提出了应用上述技术的方案,利用Creator的地形建模模块,生成大面积地形,采用视景仿真软件Vega绘制虚拟场景,实验表明达到了良好的效果.     

Agisoft Photoscan多视点3D建模技术在校园虚拟漫游中的应用

校园虚拟漫游系统场景创建过程中,针对虚拟地形和复杂景观建模所遇到的地形面积大、形态复杂、建模工作效率低等问题,笔者在VR校园部分模型构建中使用AgisoftPhotoscan多视点3D建模技术。相比传统的三维建模软件,AgisoftPhotoscan软件易上手、简单,数据收集快速、高效,能快速自动完成3D模型构建。以郑州工业应用技术学院所建立的校园虚拟漫游系统为例,介绍Agisoft Photoscan多视点三维建模技术的方法和流程。     

虚拟校园三维仿真系统关键技术研究

应用Multigen和Vega开发工具,可以开发逼真的三维仿真系统.而建模的好坏和交互效果直接影响系统的运行,结合虚拟校园三维仿真系统研制中的具体工作,研究了基于Multigen场景建模和Vega实时驱动的关键技术,并给出了虚拟校园三维场景建模和实时驱动的设计实现.     

快速实现三维虚拟校园开发的方案与实践

三维虚拟校园开发对于校园数字化建设具有重要意义。本文提出一种基于3DStudioMax和Virtual Reality Platform技术相结合的三维虚拟校园建设方案。通过三维建模、纹理贴图、渲染烘焙、交互设计等技术操作,实现校园景观仿真、校园导航和交互查询等功能。实践的结果表明,采用该组合方案可以良好地实现实体景观三维虚拟展示。     

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。     

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.