联邦成员框架代码的自动生成技术研究

联邦成员软件的开发者面临着学习和使用RTI库的问题,大量低层接口的编程往往会使联邦开发者的注意力从联邦问题域转移到RTI技术细节上去.因此生成联邦成员框架代码的设计和实现可以大大降低成员软件开发难度,加快成员软件开发.该文通过分析联邦成员的程序流程和软件组成,采用面向对象的方法对联邦成员进行了抽象,设计了一些体现联邦成员特征的基本类,并基于这些设计实现了一种由HLA对象模型（FOM/SOM）自动生成联邦成员软件框架代码的方法.在RTI和实际的仿真实体模型间提供了一个抽象层,开发者不必考虑联邦成员与RTI之间的信息交换过程,只负责实现仿真实体模型的仿真功能,从而在成员级上实现了成员代码重用.     

基于HLA的仿真程序设计研究及其应用

建模与仿真高层体系结构(HLA) 已成为电气和电子工程师协会( IEEE) 标准,正在成为今后仿真发展的主要方向.但是目前大多数学者只专注于HLA理论研究或者只从联邦内部数据交换的角度来研究基于HLA的仿真程序设计,缺乏直观性和实用性.文中从程序设计的角度、以C 语言实现为例剖析了HLA的编程代理模型和联邦成员代码的三个职责,并且还详细分析了FED文件中定义的对象类和交互类与联邦成员文件结构的对应关系,然后从联邦的执行过程出发给出了基于Windows方式下联邦成员的程序设计框架,最后以一个简单的planetrace联邦的例子来说明了联邦成员仿真程序的实现流程.     

HLA联邦成员设计中同步问题的研究

基于HLA的分布交互式仿真是目前仿真领域的研究热点。由于HLA联邦是由多个HLA联邦成员协同组成的一个分步交互式仿真系统，所以在HLA联邦成员设计中必须考虑同步问题。该文系统分析了HLA联邦成员设计中的同步问题，包括联邦成员启动阶段的同步问题和仿真阶段的同步问题，并对相应的同步问题给出了非常实用的解决方法。     

联邦成员应用程序的一种模板实现

联邦成员应用程序的开发是基于HLA的分布交互仿真系统建设的难点和重点,其设计与实现复杂.为了提高联邦成员应用程序的开发效率,增强应用程序的通用性,通过对不同应用目的的联邦成员进行研究,提出了联邦成员应用程序开发框架模型,并以此为基础,设计实现了对象类模板、交互类模板、联邦成员类模板.实际的程序开发实验结果表明了模板的实际效果,可经过修改和扩充实现不同的仿真目的,并为自动化的程序框架生成工具的开发奠定了基础.     

基于HLA的电力市场仿真系统设计

以HLA为计算机仿真标准，针对单一买方电力市场模式，构建了电力市场仿真系统模型，设计了整个系统的实现框架。在分析电力市场的体系结构基础上，开发了仿真系统中的对象类、交互类以及联邦成员，设计了联邦运行的整个流程。整个电力市场仿真系统是一个联邦，由3个水电公司、一个火电公司以及一个电网公司5个联邦成员组成，各联邦成员之间通过公布／订购对象属性和发送交互仿真了整个电力市场的运行。利用HLA技术对电力市场进行仿真研究是一种可行的方法。     

RTI网络监控研究

分析了高层体系结构（HLA）的核心部件联邦运行支持环境,即RTI网络的监控机制在大规模虚拟试验中的重要性和监控程序的设计流程。对监控程序进行了模块化分并分析了各个模块的功能和实现方法。提出了一种利用HLA管理对象模型（MOM）中的预定义的对象类和交互类,以联邦成员的方式加入联邦,通过订购发表MOM对象类和交互类,并向RTI发送MOM交互类来实现对联邦和联邦成员进行监控的方法。     

基于HLA的虚拟战场仿真联邦成员设计与实现

高层体系结构为虚拟战场提供灵活的战场仿真环境。论文简述HLA的组成和原理,分析了基于HLA的虚拟战场仿真系统的组成,详细阐述了雷达、指挥控制和导弹联邦成员的设计,构建雷达发现目标概率、目标威胁排序和导弹命中概率的数学模型,并设计其对象类和交互类,完成战场仿真的联邦成员设计。仿真实验结果表明了所设计仿真系统联邦成员的有效性,使仿真系统中双方打击过程的实时测试仿真达到较好的仿真效果。该仿真系统中的数据模型分析方法,对其它领域内基于HLA的仿真系统设计和开发具有参考价值。     

基于HLA和VR的导弹武器系统仿真平台设计

应用分布交互仿真高层体系结构HLA和虚拟现实技术，结合导弹武器系统特点，设计了基于HLA和VR的某型地地导弹武器系统仿真平台体系结构．并介绍了三维虚拟场景建模、联邦成员模型、仿真对象模型以及成员接口的设计与实现。     

基于网络的森林灭火仿真系统研究

针对森林灭火需要多要素可同时参与的复杂性,提出基于局域网构建虚拟森林环境及其灭火仿真环境的原型系统体系结构。描述森林灭火仿真系统的联邦模型、联邦对象类、交互类和联邦成员的设计和开发过程,并就仿真系统的仿真过程及其采用的“既时间控制又时间受限”的时间管理策略作了分析。采用高层体系结构,以面向对象的编程语言VC++及OpenGL图形库为平台,完成具有可交互的森林灭火仿真原型系统的研发。     

基于多Agent的半导体生产线调度仿真系统

提出在高层体系结构（HLA）下集成多Agent的方法对半导体生产线进行建模与仿真。多Agent系统可以提供仿真的智能支持,而HLA则可以提供一致的基础框架,解决多Agent仿真带来的互操作和一致性问题。针对半导体生产调度的特点,构建了仿真系统框架。仿真联邦由Agent联邦成员和非Agent联邦成员组成,各联邦成员之间通过对象类、交互类、Agent消息实现互相访问,Agent联邦成员通过协商算法生成优化的调度方案。最后,基于JADE实现了一个多Agent的半导体生产线调度仿真系统,并进行了仿真实验。     

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.