VxWorks下1553B总线在飞机配电系统中的软件开发

分析了先进飞机配电系统的结构和功能,在此基础上介绍了1553B总线的通讯结构;详细论述了在VxWorks下1553B总线通讯的软件开发流程,在分析了总线控制器BC和远程终端RT的固件数据结构的基础上,重点给出了以总线控制器BC为例的程序设计,同时也说明了配电系统中1553B总线实时多任务的调度方法;飞机地面电网试验表明,通讯系统运行稳定,并充分满足高速传输和实时通信的设计要求。     

1553B总线RT有效性测试方法研究

1553B总线是美国制定的一种串行总线标准,具有较高的可靠性和安全性,因而在航空、航天、军事等领域得到了广泛的应用;在1553B多路传输数据总线网络中,要想保证1553B网络正确可靠的通讯,必须保证各个远程终端系统能够满足MIL-STD-1553B规定的各项功能、性能以及协议等要求,所以对远程终端(RT)进行有效性测试变得非常重要;在充分研究1553B通讯协议的分层结构基础上,提出了1553B远程终端系统测试方案,并指出在通用1553B接口板平台上该方案的实现方法,按照该方法对RT进行测试时,可以正确测试出被测RT是否满足1553B协议要求。     

MTK平台短信控制远程终端的实现方案

充分发挥MTK平台高性价比的优势,提出了基于MTK平台的短信控制远程终端实现方案.在深入讨论MTK短信息模块和GPIO口驱动机理的基础上,裁剪和修改了MTK软件系统,实现了MTK远程终端短信息接收、控制外接负载和远程终端自动回复短信等功能.试验结果表明,利用短信息遥控远程MTK对外接负载进行控制的方案切实可行.该方案的...     

基于VxWorks的1553B驱动设计技术

介绍了1553B总线技术,分析了这种时分制指令／响应式多路传输数据总线的工作原理和主要特点,提出了基于VxWorks系统的1553B接口卡的驱动程序设计方法,在此基础上介绍了VxWorks下开发总线控制器（BC）、远程终端（RT）、总线监控器（MT）等驱动程序的方法。     

基于GPRS网络的飞机除冰液加热监控系统

针对飞机除冰液加热,设计了一种基于GPRS(通用分组无线服务)网络的远程监控系统.它可以实现对设备的实时监控,及时有效地完成飞机地面除冰.该系统由上位机和下位机两部分组成:PLC作为下位机的控制系统,对执行机构进行控制输出,并且由A/D转换模块采集加热设备管道内的物理参数;远程控制中心作为上位机的监控系统,包括两种方式:一是利用数据服务中心作为远程控制中心,二是利用组态软件设计系统的操作界面作为远程控制中心.GPRS DTU(data transfer unit)通信模块通过GPRS网络完成与远程控制中心的无线通信,实现上位机与下位机之间的数据交互.     

基于物联网的楼宇物业远程监控终端设计

提出基于物联网的楼宇物业远程监控终端设计方案，根据物业远程监控终端部署物联网环境，对其终端参量及其模块进行有针对性的优化设计，由基于物联网络的多终端数据链路模型、多目标远程监控动态模型设计、物联网络监控远程网关结构设计3部分量化设计构成。通过与3种不同算法终端的仿真数据对比，证明本文设计方法有效、可行，能够解决楼宇物业远程监控终端因信号参量问题导致的控制效率偏低、误差偏大的问题。     

基于1553B总线的某测试系统中远程测试模块设计

采用1553B总线技术实现电气系统的信息一体化设计已被越来越多的领域运用;测试系统作为某导弹电气系统的重要组成部分,在以往运用中暴露出一些难以克服的缺点;文事首先分析了传统运用产生缺点的原因,阐述了采用1553B总线作为公共通道的某弹上测试系统的设计思想,并给出了具体的测试系统结构;具体介绍了作为远程终端(RT)的测试模块的功能及硬件组成,给出了其部分软件设计;设计的由多个测试模块组成的测试系统在实验室运行良好。     

一种嵌入式远程配变监控终端的研究与设计

鉴于仪器的网络化发展趋势，介绍了一衬网络化的远程配变监控终端系统的研究与设计。基于32位嵌入式微处理器LPC2124和实时操作系统μC／OS-Ⅱ，以GPRS网络为通信媒介实RT终端的远程采集、参数配置、控制命令的下传和软件系统的实时更新与维护。该系统具有实时性好、可靠性高、组网方式简单、易于维护和运行费用低等特点，为用电需求侧管理提供了一种有效的技术手段。该设计研究可广泛应用于当前的电力管理中。     

FPGA的1553B总线全消息处理远程终端设计

本文在研究MIL-STD-1553B总线远程终端协议逻辑的基础上,为实现10种消息类型的全部识别处理,采用消息识别的设计方法将总线通信的消息归纳为接收消息、发送消息和地址无效消息3类,并针对每类消息按照细分的消息类型分别处理,基于FPGA技术和有限状态机技术设计实现具有参数可配置的远程终端协议模块.软硬件仿真测试结果表明,本文设计的远程终端协议模块满足MIL-STD-1553B总线远程终端协议功能需求,具有工程可实现性并能与某1553B仿真卡建立总线通信,为设计开发其专用协议产品提供一定技术参考.     

FPGA的1553B总线全消息处理远程终端设计

本文在研究MIL-STD-1553B总线远程终端协议逻辑的基础上,为实现10种消息类型的全部识别处理,采用消息识别的设计方法将总线通信的消息归纳为接收消息、发送消息和地址无效消息3类,并针对每类消息按照细分的消息类型分别处理,基于FPGA技术和有限状态机技术设计实现具有参数可配置的远程终端协议模块.软硬件仿真测试结果表明,本文设计的远程终端协议模块满足MIL-STD-1553B总线远程终端协议功能需求,具有工程可实现性并能与某1553B仿真卡建立总线通信,为设计开发其专用协议产品提供一定技术参考.     

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.