基于某型防空导弹的尾焰仿真研究

应用粒子系统对某型号导弹武器系统的尾焰仿真进行研究，给出的尾焰仿真模型和粒子简化模型，改进了粒子系统在模拟不规则物体时为了达到逼真程度而增加粒子数量，但影响系统实时性的传统做法。该模型可以用较少的粒子就能达到系统的实时性和逼真程度很高的效果，最后在基于DirectX平台上利用VC 语言进行了绾程实现，验证了该方法的有效性和实用性。     

基于柏林噪声的中国水墨画仿真算法

为了实现中国水墨画的计算机仿真,基于对水墨画感性艺术效果的分析,提出了基于柏林噪声的中国水墨画仿真算法。该算法运用柏林噪声的基本理论,通过构造随机噪声函数、插值干扰函数等方法来实现水墨画的特征效果。仿真结果证明该算法较成功地模拟了中国水墨画的典型艺术效果。     

采用虚拟粒子解决织物仿真中的碰撞问题

提出一种粒子系统，能在任何需要正确模拟碰撞的地方自适应的生成新粒子。当粗糙网格与物体发生碰撞时使网格自动细化。因此这种模型与一般的粒子系统相比，只需要少量的粒子就能获得精确的物理仿真效果。同时，使用粗糙网格进行快速仿真成为可能。     

应用分形仿真水墨扩散轮廓

针对水墨在宣纸上扩散后会出现较明显的具有自相似特性的轮廓线这一特点，提出一种仿真中国水墨画扩散边界的实现方法．该方法通过流体仿真模型产生扩散笔迹，利用分形在扩散笔迹的最外层模拟一条不规则的扩散边界，并填充两者之间的空隙，使得扩散效果更自然、逼真．实验结果表明，借助分形模拟的扩散效果接近真实的水墨画效果．     

水墨画仿真中画笔的行为实现

对中国水墨画进行仿真研究是计算机艺术领域的一个具有挑战性的课题。本文基于对水墨画感性艺术效果图形的分析，建立起画笔模型，并对其进行数字化、标准化处理。通过初始化不同画笔的数据结构，使用户通过鼠标、键盘、电子画笔等输入设备，生成交互式的、可控制的、结构化的水墨典型艺术效果。试验结果表明，该算法较为成功地实现了对水墨画笔的仿真。     

基于通用粒子系统模型的虚拟战场特效设计

该文总结了基于粒子系统的战场特效仿真方法,通过对粒子系统建模过程的分析,抽取战场特效的共同特性,设计了一个由粒子发射器、粒子、属性修改器和渲染器组成的通用粒子系统模型。并通过该模型对虚拟战场的常见特殊效果进行仿真。     

基于Direct3D与粒子系统实现喷泉效果

粒子系统是实现喷泉效果的有效方法,运用Direct3D中的点精灵作为粒子图元渲染喷泉粒子具有一定的灵活性。首先介绍3D图形函数库Direct3D及粒子系统的基本原理,然后运用物理动力学分析现实生活中的喷泉运动,构建出喷泉粒子系统模型并实现喷泉的三维效果。提出伪粒子黏度的方法,使多个粒子“黏合”形成不同大小的水珠,增强了喷泉的真实效果。     

基于OSG粒子系统的消防水柱模拟研究与应用

消防水柱的模拟在消防模拟演练中有着广泛的运用．为了模拟真实的消防水枪喷出水柱的效果,建立逼真的仿真场景,提出了一种基于OSG（open scene graph）粒子系统仿真模拟技术,结合场景真实数据的自定义水粒子模型设计方式．该模型依据水柱的两个端点间水平距离和高度差数据,动态的产生水粒子的属性值,解决了传统模型中水柱不够真实的情况,实验结果表明,自定义水柱粒子模型能够真实的模拟消防水枪喷出的水柱,具有逼真的仿真效果．     

基于粒子系统的可调参数的瀑布模拟

本文根据粒子系统的基本框架实现了多种效果的瀑布模拟。模型利用粒子系统API提供的函数,使用点、线元、多边形等方式渲染粒子,通过调节参数即可模拟多种瀑布效果,并结合动力学原理,使瀑布流动效果更加真实。实验证明,该方法模拟瀑布速度快,使用少量代码就能在普通PC机上获得令人满意的效果。该瀑布模型灵活性强,易于移植和扩展。     

基于3D GameStudio的粒子系统设计与应用

随着虚拟现实技术和计算机技术的发展,运用粒子系统来模拟动态的复杂实体和自然现象越来越受到人们的关注。基于3DGS（3D GameStudio）即3D游戏著名游戏工具软件,设计了几种实时的粒子系统。介绍了粒子系统的实现方法,包括粒子的属性定义以及粒子生命周期控制等特性。在该系统中举例分析了火焰和雨雪几种实体的特点,运用3DGS中自带的脚本编写工具Lite-C实现了其粒子效果的模拟。实验表明基于3DGS的粒子系统实现简单且对复杂的动态实体和自然现象都能够达到很好的仿真效果。     

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.