一种遥测数据采编器设计

针对某模型弹遥测系统数据的采集,提出了一种数据采编器的设计;该设计以FPGA为控制芯片,实现了2路RS422总线数字信号与48路模拟信号的采集,将采集的信号通过数据帧格式的形式进行编帧存储到存储器,并通过USB接口实现了与上位机的数据通信,将存储器中的数据上传给上位机,最后运用Visual Basic 6.0编写的应用软件对上传的数据进行处理;实验表明,该设计采集精度高,功耗低,具有很好的可靠性和灵活性.     

弹载遥测防毁采编存储系统的设计

在航天航空的导弹数据采集领域中,针对遥测系统受环境因素影响较大,检测区域存在的"黑障"等问题,设计一种将遥测系统与防毁记录仪相结合的弹载遥测防毁采编存储系统;该系统通过设计防毁记录仪的内外层防护结构保证系统的抗高冲击性和稳定性;硬件方面通过设计56路模拟量信号的调理电路、模数转化电路以及多路RS422、LVDS数字量信号的光耦隔离式接口电路,实现多通道高压模拟量的采集和数字信号接收的功能;软件方面通过对系统总体逻辑设计及遥测发送模块的设计,实现对数据的采集、存储、发送与读取;最后通过实验测试,表明系统能够实现对多路高压模拟信号的采集以及数据准确完整回读的功能,保证了导弹飞行数据的正确性与完整性.     

基于FPGA与ARM9平台的弹上遥测采编系统设计

随着大规模集成电路技术的飞速发展以及嵌入式系统在军事领域的应用也日趋广泛,对弹上遥测采编系统提出了新的要求;介绍了一种基于FPGA与ARM9嵌入式平台的弹上遥测采编系统设计;系统前端采用了智能传感器,并且引入了GPS技术;针对分包遥测比传统PCM遥测具有显著的优越,提出了基于分包遥测的遥测数据帧格式;基于FPGA和微处理器两种技术设计的采编系统具有可编程能力和灵活性.     

多通道高速遥测采编器的设计

设计了多通道高速遥测采编器,主要完成对飞行器工作的复杂环境参数的32路模拟量采集和实时显示.系统采用一片ADC分时复用方式,采集数据使用数字滤波-FIR滤波处理,很好的滤除白噪声干扰.ADC选用AD9220,其最大采样率为10MSpS,与上位机通信电路采用USB接口芯片的FT232H,其异步FIFO模式最高速率可达8Mbps的传输速率,同时通过工业IOCOMP控件快速绘制实时曲线,避免了采用Line函数绘制曲线的延时问题,实用于高速的数据采集系统.此设计方案可作为一种通用型数据采集系统,适用于不同采样要求.     

某型无人机机载遥测系统帧结构设计

本文根据某型无人机遥测系统的特点与需求,结合现代遥测系统的典型应用,对传统固定格式的PCM帧结构进行了改进,设计了一种可支持每组多路多组并发采集的PCM码流与多路异步数据码流复用传输方式的帧结构.     

供配电模块的高精度采集的设计

为了解决遥测系统供配电单元的稳定性与可靠性,设计了一种以FPGA为数据处理器的高精度采集系统,利用减法电路的设计研究了电压转换技术,经过ADC转换对多路配电电压进行采集并实时处理多路遥测信号,通过串口传输至上位机,完成实时监测工作状态的目的;着重阐述了对配电的高进度采集电路的设计、RS422数据传输模块发送与接收的设计与实现以及传输过程中UART内核所实现的功能.经大量测试表明该方案稳定、实用,满足系统的实时性要求.     

基于FPGA的多通道数模信号实时采编存储系统

介绍了一种基于FPGA的多通道数模信号实时采编存储系统的设计与实现;分别从总体设计、硬件设计和软件实现等方面进行描述;系统以FPGA为核心控制芯片,实现了4路RS485总线数字信号与28路模拟信号的实时采集、混合编帧与数据存储.并通过具有USB2.0接口微控制器CY7C68013完成与上位机的通信;本系统采用模块化设计方法,功耗低、采集精度及可靠性高、实时性好,具有广泛的实用性与通用性.     

一种182路传感器数据采集电路的设计

为实现工程实践中182路传感器信号的采集,设计一种基于FPGA为核心控制器,12片模拟开关并联连接及双A/D转换器布局的多通道数据采集电路;传感器输入信号经过信号调理电路后实现阻抗变换并滤除高频干扰噪声;针对不同传感器信号的采样率建立数据编帧表,采用数据编帧表建立ROM地址查找表来实现信号通道的切换及不同信号采样率的灵活控制;在A/D采样逻辑设计中采用中采用优化时序措施来减少控制器操作时的等待时间,提高工作效率,采集后的数据上传到计算机分析;大量的实验测试已验证该电路的有效性和实用性。     

基于FPGA的多通道数据采编器的设计

针对某型号弹上模拟信号的采集和存储,设计一种基于FPGA的多通道模拟信号和数字信号的采编器;对弹上的不同速率的速变和缓变模拟信号进行采集,与接收的数字信号编帧和存储,并通过具有USB2.0接口单片机CY7C68013完成与上位机的通信;该系统采用模块化设计方法,实验表明,精度及可靠性高、实时性好,具有广泛的实用性与通用性。     

基于AD8031多通道采编器的设计与实现

文章简要地介绍了多通道记录器的总体组成;该弹载记录器以FPGA作为主控芯片,实现72通道的数据采集;重点介绍了基于AD8031遥测采编器的设计尤其是采集板卡的设计;针对采集板卡中存在的单电源供电运放存在的震荡问题提出了有效的解决方案即在一级模拟开关运放后串联100欧姆的电阻;通过实验结果图,可观察到震荡消失,且对后续电路没有造成影响;该采编器采取解决该方案之后,经过了高低温和振动试验,工作稳定,震荡消失。该方法已用于以后弹载记录仪的设计和生产中。     

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.