一种基于单片机的短距离无线通信抗干扰方法

利用单片机和射频模块进行无线数据通信时,通过单片机的串行I/O口来完成数据的串行通信存在许多不足之处,如差错检测能力差、无纠错功能等.针对以上问题提出了一种通过单片机和射频模块以软件方式实现短距离无线通信抗干扰的技术.用高低电平持续不同时间的矩形波来表示数据位‘0'和'1';采用CRC冗余校验实现数据的错误检验;利用瑞德一所罗门码实现数据的错误纠正.将该方法应用于电动滑板车的短距离通信设计中,实验表明,该方法使系统抗干扰能力有显著的提高.     

基于LabVIEW的多点测温系统

介绍了一种基于LabVIEW和DS18B20温度传感器的单总线多点测温系统。多个温度传感器DS18B20通过单总线结构连接到单片机的一个双向口,单片机和PC机通过串口连接。在主机中用LabVIEW软件建立友好的用户界面,在该界面中可以通过串口向单片机发送命令,接收温度数据;并对数据进行显示、保存等处理。单片机响应主机的命令,发送主机选中的温度传感器的数据。利用该系统可以方便地实现远距离的多点温度测量。     

基于DSP和MSP430双核交通监控终端的设计

介绍了由DSP和MSP430单片机组成的双核交通监控系统终端。在该系统采中,MSP430单片机负责交通灯的控制和车辆行进状态检测;DSP负责对违章车辆进行CCD抓拍、图像处理以及数据上传等工作。MSP430单片机与DSP通过主机接口HPI进行通讯;DSP通过GPRS接入互联网,将数据上传至交通违章记实录数据库。     

嵌入式智能定氮测控系统的设计

通过对凯氏定氮法和整个系统控制原理的分析,介绍了基于单片机的测定物质中氮元素含量的测控系统,该系统分别采用ATMEL公司单片机ATmega16为控制核心,实现了消煮炉恒温控制;采用单片机ATmega128为控制核心,结合步进电机驱动进行标准溶液的滴定,实现了准确测定物质中氮元素的舍量.文中给出了系统软硬件设计方案,对其实现方法及其关键技术进行了研究.实验结果表明该系统工作稳定,测量数据准确,具有一定的应用价值.     

基于单片机的光电能量转换数据采集系统设计

文章论述了光能量转换系统,将太阳能转换成电能并存储在蓄电池里,通过控制将转换的能最传输给负载;通过数据的采集和处理为负载的能量分配、系统的能耗、效率等参数的计算提供依据;设计了基于单片机为主控芯片的数据采集与处理模块系统,通过采集电压、电流、温度、湿度和光强度数据,以模拟信号或是数字信号的形式传输到C8051F040单片机中,并在液晶显示屏上显示出来;实验结果表明,该系统有良好的采集数据精度和可靠性,运行功耗低,具极高的工业实际应用价值.     

基于Android的多级净水控制系统设计与实现

为实现自来水自动过滤为可饮用安全水,设计了一种新型的多级净水控制系统.该系统主要包括对过滤结构、控制结构和远程监控结构的设计,过滤结构采用反渗透膜和超滤膜级联的方式,实现了水的净化过程;控制结构采用C语言编程的AVR单片机,实现了净水系统的自动反冲洗、与MCGS触摸屏采用Modbus通信和与WiFi模块采用自设计通信协议通信等功能.远程监控结构采用Eclipse开发环境,WiFi通信技术,实现Java编程的Android手机软件.最后通过实验证明了该设计的可行性,并成功解决了净水系统自动反冲洗和远程监控的问题,对水质有很好的净化效果,具有广阔的发展前景.     

基于GPRS的下水道气体远程监测系统设计

为了提高城市下水道气体监测的实时性和可靠性,设计了基于GPRS的下水道气体远程监测系统;该系统主要包括前端气体采集模块、GPRS数据无线传输模块、数据接收模块及监控中心;气体采集模块由气体传感器和数据采集单片机组成;单片机实时采集气体传感器中的数据,并将采集到的数据通过GPRS无线传输模块进行实时上传;数据接收模块把接收到的数据传送至监控中心服务器,由服务器对数据进行处理、显示、存储和统计等;通过对18个监测点的监测实验效果表明,该系统运行稳定可靠,能实现对下水道气体远程采集、无线传输和实时监测的目的。     

基于单片机的光电编码器位置检测系统设计

为了实现对机床设备运行状态的实时监测,设计了一种基于单片机的光电编码器位置检测系统;系统采用高性能的AVR单片机对编码器的两相位置信号进行鉴相及四倍频处理,然后通过MCS-52单片机的T2计数器进行硬件计数,同时使用MCS-52单片机的串行端口将位置数据传送至上位PC机中;采用VB6.0软件设计上位机的监控界面,实时动态显示各种编码器的位置数据;试运行结果表明,该设计不仪电路简单,且计数精度高、响应速度快,达到150kHz,适用于各种位置及角度检测场合.     

GSM田间多地点多数据采集系统设计

利用STC89S52单片机和GSM网络设计了一种智能监控系统.通过单片机控制GSM模块收发短信,用户就可以实时采集到田间的温度、湿度等数据.该系统突破地理和环境上的限制,实现了集中监控,从而帮助用户合理配置资源.     

基于CPLD的打印数据采集系统

介绍了一种基于CPLD的打印数据采集方法.首先分析了打印机工作原理和几种打印机控制语言,基于FPGA和单片机设计了对打印接口数据进行采集的系统,通过软件设计将原先只能打印出来的数据进行再次采集,便于进行后续数据处理.该系统已成功应用于自控实验中频谱分析仪的数据采集,效果明显;该系统结构简单、性能可靠、开发成本低,也适用于其他类似仪器的数据转换.     

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.