基于Internet的协同CAD技术研究

协同CAD是将计算机网络、CSCW与CAD/CAM相结合的研究领域 ,协同CAD设计工具能够为分布式产品开发小组提供在线的、实时的协同讨论和问题求解的环境。通过对协同CAD的分析 ,提出协同CAD系统应划分为通用CSCW功能和专用CAD功能 ,并针对Internet低速网络环境下的实时性问题 ,详细地讨论了基于消息通信的显示同步和造型同步的实现技术。     

基于XML的协作虚拟样机通信技术

协作虚拟样机技术是在分布式环境下多领域专家协作建立和应用虚拟样机的方法和技术。如何实现系统中数字模型的同步以及相互操作是一个复杂的课题。目前协作虚拟样机通信的主流技术仍然使用传统的专有的通信协议和特定的数据格式通信，不能扩展，很难构建异构的、基于Intenct的协同设计环境。文中介绍了一种使用XMI，作为数据格式、HTTP作为传输协议的用于协作虚拟样机的通信模式,它可以很好地解决上述问题,进而构建一个面向对象的、可扩展的、基于Intemet的、跨平台的分布式协作虚拟样机系统。     

基于XML的协作虚拟样机通信技术

协作虚拟样机技术是在分布式环境下多领域专家协作建立和应用虚拟样机的方法和技术.如何实现系统中数字模型的同步以及相互操作是一个复杂的课题.目前协作虚拟样机通信的主流技术仍然使用传统的专有的通信协议和特定的数据格式通信,不能扩展,很难构建异构的、基于Intemet的协同设计环境.文中介绍了一种使用XML作为数据格式、HTTP作为传输协议的用于协作虚拟样机的通信模式,它可以很好地解决上述问题,进而构建一个面向对象的、可扩展的、基于Internet的、跨平台的分布式协作虚拟样机系统.     

基于MAS代理机制的协同设计系统研究

动态联盟的分布性、自治性、动态性等特征,给联盟的协调带来极大的复杂性。在讨论基于Web服务的多A-gent协同平台的基础上,提出如何解决异构CSCD系统之间的组织,同时对MAS的协作、协商、协调和通信机制进行了深入研究,建立了多Agent协作的网络协同设计多层体系结构和协作模型,为动态联盟环境下的协同技术提供支持。     

计算机支持的协同设计研究

文中讨论了建立计算机支持的协同设计支撑平台的关键技术。在体系结构上提出一个三层的结构，其中ＣＳＣＷ支持层设计为公共的协作代理。对基于共享对象协作的协同设计建立了超媒体结构的信息模型。按照这种思想建立的原型系统能够支持在地理上分布的多个用户，通过异步和同步的协作方式完成协同的设计工作，在异步协作方式下，可支持多用户通过对共享对象的操作完成协作；在同步协作方式下，可支持多用户通过对共享对象的操作完成协     

业务协同远程项目管理信息系统建模与实现

论文设计了一种计算机支持的业务协同远程项目管理信息系统。基于对现代项目管理业务协同信息模型的分析,阐述了群体协作系统模型、业务协同信息平台体系结构、同步机制与群组通信机制,使用统一建模方法设计了系统的静态模型和动态模型,给出了项目管理信息系统应用模型和用例模型。     

基于草图的面向概念设计的协同图表绘制工具

概念设计过程使用了多种图表来表示设计概念以及构建功能结构.将手绘草图作为设计者之间的一种通信语言引入到异地同步协同概念设计过程,提出了基于手绘草图的协同图表绘制多agent 系统,包含草图交互、草图识别、通信、协调等多个agent.讨论了各agent 之间的通信机制以及主要agent 的实现策略,包括草图识别以及语义一致性维护策略.将系统应用到协同流程图绘制领域,运行结果表明,该工具能够改善人机交互模式,促进多用户之间的交流和协作.     

CoGIS系统中通信子系统的设计与实现

协作GIS(CoGIS)系统的通信机制不同于WebGIS、网络GIS,其关键在于在所有的协作成员之间建立起通信链路,以保证成员之间的相互感知与协同。在此基础上,文章从CoGIS系统体系结构出发,采用直接通信和混合通信的通信方式来建立成员间的通信链路,设计并实现了连接层-数据层-控制层的通信模型,支持了成员的多媒体通信和消息通信需求,实现了一种实用、简单、可扩展的通信机制。     

基于Web的协作支持环境的研究与实现

提出的基于Web的协作支持环境（CSE），采用非透明事件广播类的同步协作模型，有效地解决了茯享屏幕类同步协作模型所存在的问题，可以很好地应用于Internet环境。对基于Web的协作支持环境的总体结构及各个模块的功能进行了详细讨论，并介绍了该系统的开发环境和实现方法。     

图形协同标绘系统的研究与设计

讨论了一个远程同步的图形协同系统的设计与实现,重点研究了在协同工作中的交互技术,讨论了人－人界面的图形交互技术,并发控制策略以及协同感知的设计。     

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.