基于3dsMax/Unity3D的水平定向钻穿越工程应用

针对复杂地质结构下管道穿越和施工安全,综合分析国内外三维地质建模和虚拟现实可视化现状,提出基于3ds Max平台下的三维地质建模方法,完成水平定向钻穿越工程中复杂岩层地质模型的准确建立,实现岩层地质信息与穿越工程三维拓扑模型的数据映射。利用Unity3D开发引擎在虚拟现实仿真上的技术优势,基于Unity3D和Visual C#.NET开发环境完成三维地质场景的视点控制、穿越轨迹实时生成和数据管理,实现虚拟现实场景的实时展示与可视化交互。以江都-如东输气管道水平定向钻穿越工程为例,通过3ds Max创建三维地质场景,应用Unity3D平台虚拟可视化技术模拟输气管道穿越过程,为水平定向钻穿越工程的施工建设和规划管理提供参考。     

基于Quest3D的虚拟中药药材展示系统研究与实现

随着计算机软硬件和虚拟现实技术的发展,运用虚拟现实技术辅助规划设计和展示已成为该领域的研究热点.本文介绍了一种基于虚拟现实软件实现的虚拟药材展示系统的设计方法,即利用三维建模软件3ds max进行三维实体及场景建模,采用虚拟交互平台Quest3D为场景驱动.本文以应用该方案实现的虚拟药材展示系统为例,重点介绍了系统架构和实现的技术流程,并对实现过程中的场景建模技术、交互设计中的图形化设计方法以及增强场景真实感方法做了深入的阐述.     

虚拟现实技术在三维产品细节展示中的应用研究

简单说明了虚拟现实技术的主要特点,并以建立产品的三维模型、建立三维场景、渲染与贴图烘焙、三维交互动作的设计为切入点,分析了基于虚拟现实技术的三维产品展示主要流程.同时,选定光整机作为样品,从建模平台、建模原则、场景模型、VRP漫游的实现、场景交互的实现、烘焙技术的引入这几方面入手,对基于虚拟现实技术的三维产品交互展示进行说明.     

三维动漫制作与虚拟现实结合技术研究

基于为高校三维动漫教学提供良好的教学技术和实验平台,研究了三维动漫制作与虚拟现实技术相结合的方法,采用三维计算机图形技术CG(Computer Graphics)、影像技术和运动捕捉系统,实现高质量高效率的三维动漫制作。介绍了将动漫技术、虚拟现实VR(Virtual Reality)设备和网络技术相整合的交互动漫虚拟环境建设方案。     

情景式跨媒体数字城市系统

结合虚拟现实、GIS和跨媒体技术,提出一种具有高真实感、较强交互能力的情景式数字城市系统实现方法.该方法以GIS矢量数据为空间索引,全景交互式视频为表现内容,且加载文字、图像和音频等数据,并对这些海量信息进行跨媒体数据统一建模,以实现不同类型数据的组织和管理.与通过三维图形实现城市建模相比,采用文中方法实现的系统具有数据采集高效、表现手段真实感强、建模成本低和易于扩充等优势.     

基于VRML构造三维车模方法

以VRML为代表的WWW下的虚拟现实建模技术正在日益受到广泛的重视,基于VRML进行三维仿真建模具有交互、三维全景、多感知等特点.本文以"汽车"为研究对象,讨论、阐述了VRML构造三维模型的实现方法,并给出了建模效果验证.     

虚拟现实三维开发服务公共技术平台研究与设计

本文阐述了虚拟现实技术是计算机技术与思维科学相结合的产物,该技术的出现为人类认识世界提供了新的认识工具,通过与虚拟环境交互,有效地拓展了认识手段和领域。阐明了现有虚拟现实技术在可视化开发过程中操作较为复杂,应用空间有其局限性,难以大范围普及。探讨分析了虚拟现实三维开发服务公共技术平台所能提供的相关技术,指出该平台建设将提供一个价格低廉,应用广泛,开发效率高的平台,有其广泛的应用领域。     

基于Unity3D三维多媒体课件的设计与制作

虚拟现实的最大特点是用户可以自然地与虚拟环境进行交互操作。三维多媒体课件是三维建模技术与虚拟现实技术的紧密结合,在三维模型的基础上提供虚拟现实环境。从教学应用的角度出发,主要研究如何有效地利用Unity3D和三维建模软件去设计教学内容,探索机械构造类三维多媒体课件制作的关键技术和步骤,制作出仿真性强、交互控制灵活、支持360°全角度观察,并可随时拆卸装配的三维多媒体课件。     

基于WTK的虚拟现实组态软件研究与开发

针对传统组态软件二维工艺运行界面的不足,提出了基于虚拟现实技术的三维组态软件开发,利用3DMAX建模软件及其二次开发技术开发工业现场三维虚拟场景的组态平台.通过该平台完成三维虚拟场景文件的配置输出。介绍了虚拟现实软件开发包WTK,并利用WTK和MFC编程开发三维场景运行平台,实现了虚拟场景的四种交互方式,对场景中虚拟对象的材质纹理属性及其表现方法进行了研究,利用力控DBcom控件实现三维运行场景与力控实时数据库的数据交互,给出了系统运行的简单示例,对基于虚拟现实组态软件的研究及意义进行了展望。     

基于Arduino的虚拟现实交互系统实验案例设计

综合运用嵌入式、三维建模、虚拟现实等技术,提出一个软硬件结合的虚拟现实交互系统典型案例,实现虚拟场景与现实环境的实时交互控制。通过3DMAX和Unity3D软件设计虚拟现实交互场景,采用Arduino核心板搭建场景的控制模块,运用光敏电阻和湿度传感器实时获取环境信息并注入虚拟场景中,实现虚拟现实交互系统。     

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.