基于RTX实时环境ARINC429航空通信总线驱动设计与实现

某航电模拟器采用ARINC429航空通信总线进行通信,由于仿真强实时性的要求,ARINC429总线接口卡要运行在RTX实时环境下,因此需要设计并实现基于RTX实时环境的ARINC429总线驱动.在简要介绍RTX实时子系统和ARINC429总线的基础上,详细介绍了基于RTX实时环境ARINC429总线驱动的设计与实现流程...     

基于总线技术的实时通信方法研究与应用

针对武器装备ARINC429总线实时性要求高的问题,本文提出一种基于RTX实时操作系统的ARINC429总线实时通信方法并进行了应用。本文方法在PXI总线AMC5206B的基础上,搭建了软硬件环境,设计了Windows应用程序和RTX应用程序,通过共享内存进行数据传递,实现了RTSS进程在测试主流程的嵌入。设计了板卡在RTX系统下的驱动程序,实现了中断触发数据读取,提高了程序效率。最后,通过Windows应用程序实验验证了本文方法的功能,并具有实时性强,通用性好等优点。     

基于RPC的ARINC429总线远程实时通信方法

针对远程测试系统中ARINC429总线实时通信的需求,提出了基于RPC(Remote Procedure Call)的ARINC429总线远程实时通信方法。通过RPC实现了远程测试,而具体通信板卡控制及通信数据读写都由本地完成。远程测控应用程序通过RPC客户端DLL实现了透明化操作,本地控制器使用Windows与RTX双系统,设计了RPC服务端程序与RTSS程序,既实现了远程测试又保证了通信的实时性。实验结果表明,本方法实用性强,应用前景广泛。     

基于网络的多通道航空总线板卡的设计

设计了一种基于以太网的多通道ARINC429总线板卡,上位机通过以太网络接口可以方便地实现与ARINC429总线上的组件通信。内部集成多种可通过上位机配置的数据处理功能。给出了系统的整体构成和软件流程,重点阐述了板卡内部数据包定义和数据格式转换等内容。实验结果表明,该板卡可以稳定地实现以太网数据与ARINC429数据字的转换,完全满足航空测控系统数据通信的要求。     

基于RTX的数据采集系统设计

针对在Windows环境下数据采集实时性不高的问题,采用RTX(实时扩展系统)进行数据采集.在RTX实时环境下编写A/D板卡驱动,实现寄存器配置,利用板卡定时器触发采样.采样数据通过共享内存被LabWindows/CVI用户界面以图形显示出来.     

基于DSP的ARINC429通信板卡设计

针对目前先进飞机自动配电系统的要求,设计了一款扩展性和可靠性好的ARINC429通信板卡.运用FPGA技术完成接口逻辑控制和全局时钟分配(倍频或分频),采用HI-8582协议芯片和多路开关相互配合构成可动态配置的多收/发通道,简化了硬件电路复杂度;使用混合冗余和大电流保护技术提高了通信可靠性,同时开发了基于VxWorks的板卡驱动.在某飞机配电地面系统中的测试结果表明,该板卡能够实现ARINC429总线系统的相关功能,运行稳定、波形良好,有一定的推广意义.     

一种用ATLAS语言实现ARINC429总线测试的方法

通过分析某型控制装置ARINC429总线工作时序,使用新的算法分别模拟4个总线通道,巧妙组合实现对控制装置ARINC429总线的测试.解决了在ATLAS这种实时性比较差的编程语言中模拟及测试实时性强的控制装置ARINC429总线的问题.     

航空ARINC429总线通信的余度设计

针对航空ARINC429总线通信系统,结构上采用交叉传递的方法和信息冗余进行多余度设计,根据系统需求分析制定了余度判决决策;在分析了信息冗余在航空ARINC429总线通信系统中的重要性的基础上,综合了循环冗余校验和航空ARINC429协议的特点,完成了信息冗余的设计及在程序中的实现;通过在某直升机通信系统的应用,验证了该设计的结构简单、实时性高的特点,有效增加了系统余度,提高了通信的可靠性。     

RTX系统下并行I/O卡驱动程序的开发

研华PCI-1751板卡作为众多接口卡的一员被广泛使用,而出厂时该板卡并不携带RTX系统下的驱动程序,对于实时性要求较高的环境下,该板卡的使用是不太方便的。因此,开发RTX操作系统下PCI-1751板卡驱动程序成为了一个急需解决的问题。本文利用RTX提供的接口,使用I/O映射的方法操作板卡寄存器,讨论PCI-1751板卡的驱动开发流程,并对比Windows驱动与RTX驱动的实时性差异。     

基于USB协议的ARINC429总线接口板的设计

为实现便携计算机与ARINC 429总线接口的通信,采用PDIUSBDl2、HS-3182、HS-3282芯片,设计了一种基于USB协议的ARINC 429总线接口板;给出了系统的总体设计及工作原理,重点阐述了USB与ARINC 429总线的接口硬件设计、接口板固件程序的编写、USB驱动程序和应用程序的编写;提出了一种外接板卡的电源优化设计方案,解决了便携设备外接口供电总量;实验结果表明,该总线接口板数据传输稳定可靠,具有一定的工程应用价值。     

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.