磁共振成像的3D头面部模型的标准化处理

通过磁共振成像技术获取人体头部的系列二维图像,分别提取其边界坐标数据,并采用傅里叶级数拟合各层的外形轮廓,建立了一种分层描述的3D头部参数化模型.然后根据人类面部主要特征定义了若干特征层,并基于面部特征相匹配的原则,对多个样本进行了平均处理,构造出3D标准头面部模型,能够反映特定人群的综合特点.作为实例,用558个样本...     

面部动画参数的提取及驱动

论文提出一种结合CANDIDE模型和扩展的Lucas-Kanade算法进行特征跟踪和面部动画参数提取的方法,利用特定人三维扫描数据对动画网格实现特定化,驱动面部动画参数生成动画。实验结果表明面部动画参数提取的准确性和合成动画的真实感是可以接受的。     

用VB和AutoCAD实现螺栓参数化三维造型

本文介绍了六角头螺栓的参数选择方法及外形轮廓的组成，描述了螺旋线、螺纹牙型截面的产生方法及定义公式，给出了计算机辅助螺栓三维造型的步骤，讨论并解决了螺纹设计中存在的问题．利用VB语言编写和实现了螺栓的参数化三维图形设计功能。     

中医面诊中面部肤色特征基函数确定

为满足中医面诊中对面色精确描述的要求,用光谱反射率来表述颜色.基于有限维模型,面部的光谱反射率可以用一组基函数的线性组合表示.因此可采用少量的图像通道数据求解像素位置基函数系数,复原面部各像素点的光谱反射率.而基函数的确定是光谱反射率复原的基础,针对面部肤色的特点,基于标准色系及真实肤色研究了不同面部光谱反射率样本集条件下,确定的面部光谱反射率基函数对复原精度的影响,并确定了适用于面部光谱反射率复原的优选样本集及基函数组合.结果表明,优选样本集使用较少的基函数就可以达到良好的复原效果,将为基于中医面诊光谱反射率复原提供依据,进而促进中医面诊的客观化发展.     

基于OpenGL的战损模拟的装备可视化建模技术

该文论述了战损模拟中的装备建模技术基本原理，阐明了装备→基本单元模型→基本元素模型→几何元素模型这样一种采用树状结构搭建的装备模型。以装备几何数据三维可视化为核心，对装备建模系统进行了总体规划，并基于OpenGL开发了相应的几何数据三维可视化系统，利用该系统，可有效地提高装备建模的质量与效率。     

盒型CAD系统的设计和实现

为提高折叠纸盒设计的效率和准确度，设计并实现了一个盒型CAD系统．提出了一个盒型数据描述格式PKS．运用参数化设计和零件装配技术生成二维盒型结构图；同时根据二维数据自动生成包装盒的三维模型．     

加速老化试验优化分析与设计

装备加速老化试验能够提前暴露装备的薄弱环节,在装备到达服役前给出装备贮存寿命信息,并可通过更新薄弱环节延长装备寿命;加速老化试验成功与否的关键问题在于:指导试验的设计是否合理;文中介绍了加速应力-老化模型与加速老化试验类型等原理,在原有试验设计流程基础上对每一环节提出科学的判定准则和优化方案,并提出运用信息化手段设计管理加速老化试验的方法,为加速老化试验设计及实提供参考.     

基于ICA算法的一般人脸动画模式表达

该文基于三维扫描数据抽取特定人面部特征点的三维运动,转化为FAP训练数据。然后通过对获取数据应用独立元分析获得一般人脸动画模式,最终使用ICA参数空间生成任意特定人的面部表情。实验结果表明,ICA比PCA给出更加紧致准确的一般人脸动画表达模式,当两种分量的数目相同时,ICA的重建误差比PCA的重建误差小。表情参数影响动画人脸不同部分的独立性和相关性,改善了不同表情人脸动画的真实性。     

通信网络随机模拟的快速方法研究

引入现代控制科学离散事件动态系统摄动分析思想，提出通信网络随机模拟的快速并行算法。在一台个人计算机上根据被模拟网络在一组参数下的仿真样本轨迹，同时构造一簇不同参数集合的网络系统样本轨迹。     

基于光切法的全三维量脚制鞋系统的设计和实现

介绍了基于光切法的全三维量脚制鞋系统。利用基于光切法的三维形貌扫描仪对足型进行测量,得到精度为±0.4mm的足型数据。根据足部关键参数,选择标准鞋楦。将脚型划分为多个特征段,足型数据和标准鞋楦的规则化点云拟合为NURBS曲线,各段内根据脚型的特点对标准鞋楦进行整体缩放以局部修改,利用能量优化原则同时修改控制点和权因子,对标准鞋楦进行修改,使其符合脚型的整体三维特点。定制鞋楦建模后,利用等距面法得到鞋楦的刀具加工轨迹并转化为通用格式的NC代码送入数据刻楦机进行加工,定制的鞋楦用于生产适合脚型的鞋子。该系统打破了根据有限的足部参数来选鞋的传统,真正实现了基于全三维足型数据的量脚制鞋。     

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.