篮球训练仿真系统的实现

针对当前篮球训练中缺少量化计算的问题,开发了篮球训练仿真系统。首先利用篮 球运动轨迹方程求导,得到起落点不在同一水平线上的无空气阻力情况下最佳出手角和出手速度 的精确解。实验表明最佳出手角随出手速度的增加而增加,随出手高度的增加而减小。当投篮距 离增大时,最小出手速度需要增加,最佳出手角则减小。然后制作了可视化的仿真环境,并对运 动员动画、有物理材质的篮球、声音模块、关卡设计、最佳出手角计算模块及网络计分系统等进 行了研究。运动员可以利用该可视化环境测算适合自己的最佳出手角和出手速度,辅助训练。     

基于增强现实的投篮轨迹分析与模拟

投篮命中率主要由出手速度和角度决定。首先根据对数的泰勒展开式,给出在有空气阻力时一种新的简单投篮轨迹模型;其次,根据二次方程的判别式,分别给出在没有空气阻力和有空气阻力时最省力的投篮角度,其角度具有清晰明了的几何意义,有利于实际投篮的指导;最后,设计一个增强现实系统用来指导运动员进行投篮,方便运动员根据虚拟篮球轨迹和虚拟篮筐位置来调整自己的出手速度和出手角度。     

多平台三维射击游戏的设计与实现

为解决当前跨平台游戏开发难度较大的问题,使用三维游戏引擎Unity 3D开发了一款三维射击游戏,并移植到Windows,Web,Mac,MacDashboard等多个平台。从图形用户界面、关卡设计、动画模块、声音模块、人工智能等模块人手,阐述了游戏开发过程,解决了陨石围绕星体公转,用A＊算法实现飞机自动寻找最近的陨石,建立对声音的监听等问题,并对纹理贴图、天空盒等问题进行了实现和优化。     

基于Unity3D的多平台虚拟校园设计与实现

针对当前虚拟现实开发速度慢、成本高、交互性能差、平台移植难等问题,利用Unity3D进行了上海大学嘉定校区虚拟校园的开发。为加快计算速度并提高交互性,利用多边形简化技术来表现层次细节纹理,实现了三个层次的细节模型。使用动态遮挡技术建立了三维的遮挡区域,而且置于人物摄像机的视域之内,可以在人物移动时剔除不需要显示的模型,减少了计算量。利用椭圆体代替粒子,并建立了椭圆体粒子发射器、粒子动画器、粒子渲染器来表现粒子系统。同时对摄像机跟随、碰撞检测等问题进行了研究和实现。完成了校园漫游模块、虚拟展厅模块、小孩扔书游戏模块、男运动员投篮仿真训练模块。最后将虚拟校园移植到多个平台上,系统运行流畅,达到了设计要求。     

基于个性化定制的交互式蒙版擦除动画设计与实现

随着虚拟现实技术和移动互联网技术的飞速发展,众多商家希望通过移动端实现 交互式蒙版擦除动画。然而目前在个性化实时定制、交互性等方面存在问题。为此,设计了一 种基于个性化定制的交互式蒙版擦除动画方法,包括个性化定制模块和交互式蒙版擦除动画可 视化模块,其中个性化定制模块实现了定制数据的初始化处理,交互式蒙版擦除动画可视化模 块实现了移动端甩动—可视化终端蒙版擦除—后台数据查询编辑的交互式蒙版擦除动画。搭建 了原型系统并进行了实验测试,测试结果表明,该系统可以实现移动端约 2 000 次甩动的实时 同步擦除动画可视化。     

基于嵌入式系统的人工生命动画引擎关键技术研究

本文提出了基于人工生命的方法,进行动画引擎的设计,是一种理论上的新尝试,将为现有动画引擎设计增添新方法、提供新思路。考虑到嵌入式系统的存储容量问题,将就如何提高动画运行速度、提高动画效率,以及嵌入式系统中软硬件配置、3D场景与动画的无缝连接等方面进行研究。包括嵌入式系统目标平台和开发平台的介绍、选择和搭建,适应嵌入式系统的人工生命动画新方法,以及动画引擎架构设计流程,并重点分析了动画引擎中图形渲染。     

Mac OS系统下恶意软件的分析与防护

随着近年来使用苹果公司Mac计算机的用户越来越多,其使用的Mac OS系统遭遇恶意软件骚扰和侵袭的问题也越来越严重.为了增强用户对恶意软件的防护意识,解决常见的恶意软件困扰,针对常见恶意软件应用在伪装、恶意捆绑、劫持和广告等方面的问题进行了详细分析,并根据恶意软件的感染渠道和目的等特点,提出了Mac OS系统下相关恶意软件处理的方法和防护原则,对指导Mac计算机用户高效、安全、合理地使用Mac OS系统具有一定的指导意义.     

产品·市场·信息

<正> 挥臂最大加速度测试仪 1 概述 投掷运动员投掷过程中“鞭打”动作(即挥臂加速过程)完成的好坏,是投掷物能否获得较高出手速度的关键一环,“鞭打”动作愈快,即挥臂过程加速度愈大,投掷物出手速度愈高,投掷距离也就愈远。目前国内外普遍使用的“鞭打”动作测量方法,除了高速摄影外,就是目测运动员投掷轻器械(如垒球)的过程,前     

神经--运动反应时无线测量系统的研究和实现

介绍了一种基于加速度传感器ADXL105和无线数传模块的运动员起跑反应时测量系统的设计和实现。该系统通过以89C2051为核心的前端反应时测量装置实时采集运动员的反应时,然后通过无线数传模块将运动员反应时传送到PC机进行显示,并对该反应时进行记录处理,绘制成运动员反应时曲线图。     

面向自定义格式的动画角色数据转换工具

为了充分利用常用建模软件里动画角色数据信息,进行动画角色算法的 研究,开发了动画角色数据转换工具。该转换工具包括导出模块和导入模块。其中导出模块 通过对3ds max 动画角色数据结构的分析,采用max SDK 进行二次开发,将3ds max 中的 数据导出到用于存储动画角色信息的自定义格式的文件中,便于使用者通过导出的文件数据 进行动画角色网格与运动数据融合等方面的算法研究;导入模块通过max SDK 读取自定义 文件中的数据进行动画角色的导入重建,便于使用者在3ds max 里对经过算法操作后的动画 角色进行观察。动画角色数据转换工具大大减轻了研究人员的负担,使研究人员可以对最本 质的动画角色数据进行算法研究,而不用考虑对数据的重建渲染等。     

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.