基于DSP的轨道交通环境振动监测系统设计

设计了一套集振动信号采集、数据处理、数据传输和界面监控于一体的轨道交通环境振动监测系统。监测节点利用DSP数字信号处理器进行1/3倍频程谱分析,得到用于评价环境振动的参数,并通过W5500通信模块将处理后的数据上传到OneNet云平台。监控软件基于VS.NET平台开发,通过HTTP协议读取OneNet云平台上存储的数据,用来监控轨道交通环境振动状况。通过对监测系统的数据采集性能和整体性能进行测试,测试结果表明,该系统信号采集精确,结果与实际相符,达到了设计目的。     

轴承振动信号采集分析系统设计与实现

准确采集振动信号信息是轴承故障诊断的关键,利用传感器采集振动信号数据,经A/D转换后传输至STM32微控制器,STM32控制Wi-Fi模块将数据发送至PC,采用局部均值分解(LMD)方法对采集的振动数据进行分析处理,实现对滚动轴承运行状态的远程监控.实验结果表明:系统能够对滚动轴承振动信号进行精准采集和分析,传输性能好、速度快,适合在工业行业推广使用.     

基于FPGA的风电机组振动监测系统设计

通过监测传动系统的振动状态,能够有效诊断机组的运行故障。设计了一种以ARM为主控制器、FPGA为从控制器的风电机组振动监测系统。提出了系统的总体设计方案,介绍了振动信号预处理流程,重点阐述了FPGA模块的设计方法,详细介绍了数字倍频器的设计流程。该系统可接入不同类型传感器,根据传感器类型自动选择预处理电路,实现了8通道信号同步采样。FPGA主要用于实现振动信号滤波、A/D转换、数据存取、片选及逻辑控制等功能。利用FPGA的高速数据处理能力,实现了振动信号的全自动采集;通过转速的变化,实现了滤波中心频率与A/D转换速率的自适应。FPGA与ARM之间采用增强型直接内存存取(EDMA)方式进行数据传输,底层软件设计平台采用Linux操作系统,主要完成数据采集、与上位机通信等功能。该监控系统信号处理能力强、数据传输速度快,实现了风电机组振动状态的实时监测。     

电子产线实践平台远程监测系统设计

基于高校实验室对电子产线实践平台工作状态的监测需求,设计了一套低成本、高稳定性的远程监测系统。该系统应用云技术将底层视频传输模块、平台监测模块、移动应用模块整合一体。平台监测模块使用工控机采集运行状态数据发送到云平台,通过摄像头二次开发功能获取视频图像。云服务器为电子产线实践平台和安卓App提供数据服务,安卓App监测电子产线实践平台的运行状态信息,实现现场电气设备的远程控制。利用云服务器的存储功能实现状态浏览、权限管理等功能。工控机与服务器中使用Mina框架实现网络长连接,保证电子装配实践平台中运行状态的网络传输。经过测试,用户可以通过远程监测系统实现对该平台的控制。系统能够降低二次开发和维护的成本,满足智慧实验室的建设需求。     

振动数据采集无线组网监测系统

针对工厂设备在工作过程中可能损坏的情况，设计了一套以STM32为主控的振动信号采集系统，并应用ZigBee无线通信模块进行数据传输，实现对设备滚动轴承的实时监测。首先通过加速度传感器获取振动数据，然后经过信号调理和A/D转换后存储，最后通过ZigBee组网无线传输的方式在数据处理终端对数据进行处理分析，实现机器故障监测功能。通过滚动轴承模拟试验台测试，该系统可以实现振动信号的采集；通过对数据以CEEMD与峭度系数分解重构后进行包络分析，提取故障特征频率。该系统可以应用于设备的异常振动监测。     

基于FPGA的双机热备外设容错系统仿真设计

针对传统的继电保护冗余系统缺乏对敏感外设容错处理、切换速度慢等问题,提出了基于FPGA的双机热备外设容错系统。该系统由FPGA控制器、DSP控制器、双A/D模块、双继电器模块等外设组成,FPGA控制器完成双机外设模块的故障检测、双机实时切换,为DSP控制器提供A/D实时采样数据、继电器信号接口,DSP控制器对采样数据进行计算与分析,产生继电保护信号,FPGA控制器和DSP控制器通过"心跳"信号互相检测。FPGA控制器时序仿真波形表明:双机外设模块可以实现周期故障自检、双机快速切换。     

基于SIM300C的远程数据采集传输终端设计

提出一种由GPRS模块SIM300C和单片机AT89S52组成的远程数据采集和传输终端,介绍了系统的硬软件设计.该系统以单片机为主控制器,配合A/D转换电路、SIM300C模块及其外围电路,将传感器端采集的模拟电压或电流信号进行A/D转换,由单片机将相应的数字量打包,通过串口发送给SIM300C模块,SIM300C模块自动将要发送的数据打包成TCP/IP数据包,经GPRS无线通信网络发送给远端的服务器.实验结果表明,该系统运行稳定可靠、数据传输及时高效.     

基于单片机和FPGA的电能质量监测装置的设计

设计并制作了一个以单片机C8051F020为核心,并结合FPGA及双路A/D数据采集模块的简易电能质量监测装置.输入信号经过信号变换与处理模块后,满足ADS7865的幅值要求.再利用FPGA设计四个双口RAM,同时采集并存储电压电流信号,且调用FPGA中的D触发器,用以判断电压电流信号的超前、滞后特性.然后通过MCU模块控制双路A/D对信号进行采样,读取双口RAM中数据并对其进行计算和处理,并将一系列测量参数显示在LCD显示屏上.     

智能人流量检测报警系统设计

为实时监控银行等场所的人员出入情况、进行人员监控及流量统计、在出现人员滞留等异常现象时及时报警,设计了一种基于以太网的人流量检测报警系统。详细介绍了该系统的组成、工作原理、硬件设计、Web Server参数设置、通信协议及工作流程。报警控制器由以太网通信模块、人流量检测模块、报警输出模块、参数设置模块组成。采用ARM微控制处理芯片进行传感信号的检测输入和控制输出,并通过通信模块将信息实时传递给服务器。服务器对数据进行分析判断,决定是否发出警报。该报警系统可以实时监测并发现异常情况,通过以太网与远程服务器信息交互,完成对监测区域的有效监管。应用表明,该系统能够与银行服务中心无缝对接,性能稳定、可靠。     

基于LoRa通信的滚动轴承运行状态采集系统设计

滚动轴承运行环境的封闭性和应用环境的复杂性导致初期故障无法被及时发现,为了有效监测滚动轴承的运行状况,设计了一种基于Lo Ra通信的滚动轴承运行状况采集器,面向工业现场环境,通过温度传感器和振动传感器实时采集滚动轴承的温度信号和振动信号,经模拟信号处理电路处理,转换为电压信号并进行调零和放大,微控制器对电压信号进行AD转换、数据处理和报警分析,由Lo Ra通信模块将信息发送给网关,实现了设备的远程监测,为后期的大数据预测性分析提供了可靠的数据支撑。     

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.