先进飞机软件实时性能优化与测试算法

阐述了先进飞机电气系统处理机的功能;为了满足先进飞机电气系统处理机的强实时性能,着重探讨了在实时操作系统VxWorks下将电气系统处理机执行软件功能优化为若干任务,并针对普通RMS算法只能对系统中周期任务进行有效调度而不能对系统中的非周期任务进行有效调度的局限,利用分布假设检验改进RMS算法对非周期任务的调度能力,最后定量讨论了系统整个任务集的实时性和可调度性;由实际测试结果可知,该优化算法任务划分合理,可以保证强实时周期、非周期任务满足其时限要求.     

飞机配电系统负载仿真器的研究与设计

为了能在实验室的条件下验证飞机配电系统的逻辑功能及其各项性能指标,对飞机配电系统负载仿真器的原理及实现进行了研究和设计;在飞机配电系统负载仿真器所包括的上位机和下位机的系统方案中,上位机用Labview编程并由RS-232与下位机通讯,下位机利用DSP和FPGA实现对SSPC模块和汇流条电压信号模块及负载的电流信号模块进行仿真;在与电气远程终端（Electrical Remote Terminal）和电气系统处理机（PSP）的联调测试中表明,此系统可以完成预定计划中飞机配电系统的地面实验的各项任务。     

先进飞机自动配电系统的设计基础研究

电气负载管理中心是实现航空电气负载控制和管理自动化的重要组成部分,其主要任务是通过机载总线和供电系统处理机交换控制和状态信息,以实现对先进飞机二次配电中心的分布式电力汇流条和固态功率控制器的监测与控制;文章根据电气负载管理中心的功能需求与VxWorks的内在需求,在硬件上进行模块设计,在软件上划分了应用任务并分配了任务优先级,此系统可以大大提高飞机配电系统的可靠性和可维护性.     

基于UML-RT的实时系统分析与设计

介绍TUML-RT的模型结构和模型行为，同时给出了利用UML-RT进行系统分析设计的方法，最后以先进飞机电气系统处理机实现为例说明了使用UML-RT进行系统分析、设计的具体过程。     

异构总线网络的可分负载优化调度算法

研究了异构总线网络的负载优化调度问题,详细讨论了处理机选择、任务分配顺序和各处理机分配任务数量。结论表明：通过按照处理机速度递减的顺序配置处理机,并据此分配相应的任务,即可实现负载的优化调度。     

网络机群计算的负载指标研究与实现

针对利用网上空闲机进行非专用机群分布式并行计算的环境,研究复杂通用网络上用什么指标发现空闲处理机及如何实时衡量处理机的负载变化以调度分配处理机.在研究现有分布式系统和专用机群负载指标的基础上,提出了一种适用于网络机群计算环境的复合型负载指标,详细讨论了它在系统中的作用和实现,并通过大量测试分析实验,得出了一个合理的负载指标更新周期.     

民用飞机配电系统的研究

飞机配电系统是现代飞机系统的一个重要组成部分,对于保证机载设备可靠工作、保障飞行安全起着关键作用.对民用飞机传统配电方式和现代先进配电方式进行了比较,着重对基于数据总线技术和固态功率控制技术的B787飞机的自动配电系统的构架、关键组件进行了分析研究.该分布式自动配电系统能够实现对飞机配电系统构型和电气负载的自动管理,具有高可靠性和灵活的扩展性等优势,对国产大飞机项目配电系统的设计有着极好的参考价值.     

飞机自动配电管理系统设计

飞机配电系统是现代飞机的一个十分重要组成郜分,做好这项研究工作可以提高飞机的供电质量、飞机完成任务的概率以及飞机自身的安全性,减少体积重量及全周期费用,使我国飞机配电技术上一个新台阶;对某型飞机电气负载自动管理技术进行了系统研究,提出了一种电气负载管理优先级设置方法,建立了电气负载的控制方程和电气负载的电源请求方程;系统试验表明采用负载自动管理技术大大提高了飞机供电系统的可靠性和可维护性.     

ARINC429总线在飞机电源功率控制器中的应用

电源功率控制器(PCU)是实现飞机电气负载控制与电源自动化管理的重要组成部分;它通过电气数据总线向供电系统处理机(PSP)传送配电中心的数据信息,并且接收PSP发送的信息命令并执行;本系统采用ARINC 429总线设计实现了PCU与供电系统处理机和机电综合管理系统的通信;编写了基于DSP/BIOS的ARINC 429总线的设备驱动程序;实际的试验测试结果表明,该通信电路运行稳定可靠,数据传输准确,达到设计指标要求.     

基于以太网的大型飞机电气特性测试系统

基于我国新支线飞机ARJ21电气特性测试系统的实践,结合大型飞机电气系统试验测试需求,提出了基于以太网的分布式测试系统,论述了构建满足系统数据实时传输的以太网结构,测试软件综合采用Datasocket和VI server技术可以实现采样数据的实时传输和远程界面控制;根据我国飞机电气系统的发展状况阐述了飞机电气系统参数测试的方法和标准依据,为我国的大型飞机电气系统地面验证试验和空中试飞测试提供参考。     

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.