基于MSP430F149的阻抗测量系统设计

介绍一个基于MSP430F149与AD9852的阻抗测量系统的设计。系统利用MSP430F149自带的12位A/D转换,实现对负载电压电流的测量。根据测量值计算出阻抗后,通过RS485将阻抗值远距离实时传输给PC机。本设计具有精度高,可靠性较好,可移植性强的优点。     

基于MSP430F149的水质监测数据采集系统设计

针对当前水质环境监测中存在的布线难、覆盖范围低、成本高等问题,设计了一种基于MSP430F149的水质监测数据采集系统。该系统以MSP430F149为主控芯片,硬件系统由MSP430F149控制电路、串口无线通信电路、传感器电路、调理电路、电源电路等构成。其中,调理电路采用四级放大电路用于对传感器采集信号的滤波与放大;RS-232与SIM900A以串口无线通信方式,实现水质环境因子温度、pH值和浑浊度的远程实时监测;电源电路由太阳能光伏板、锂电池、继电器、稳压芯片等组成,可实现太阳能光伏供电与锂电池供电这两种模式的自动双向切换。Multisim仿真及实测试验表明,在两种模式下均可产生稳定的±5 V电压。系统上位机采用LaBVIEW设计,具有界面友好、功能完备和操作简单等特点。在实验室对系统进行模拟试验和数据分析。结果表明,采集数据波动在可接受范围内,具有一定的参考价值。     

基于MSP430F149的高精度压力数据采集系统的设计和实现

主要介绍以MSP430F149微处理器为核心,采用高精度硅压式压力传感器MIDA-MG-70和高精度积分式A/D转换器AD7714等器件对压力信息进行采集转换,完成了具备A/D转换、数据处理、温度补偿、串口通讯等多种功能的高精度压力数据采集系统。     

潜射导弹模型微小型内置测试系统设计

针对某潜射导弹模型点火发射试验的具体要求,设计了基于FPGA和MSP430F149单片机的微小型内置测试系统.系统采用FPGA作为整个系统的主控制器,用来对大容量Flash芯片进行读、写、擦操作和A/D转换操作的控制,实现了数据的采集与存储;并通过系统的双电源设计和MSP430F149单片机对整个系统电源进行控制,实现了系统的超低功耗.试验证明,该系统稳定可靠、通用性强、使用方便灵活.     

一种简易高精度直流电子负载设计与实验研究

针对镍氢电池的充放电性能测试,该文设计了一种基于MSP430F149控制的高精度电子负载测试系统,其外围使用16位A/D和14位D/A转换电路,内部使用PID控制算法,实现定电流、定电阻、定功率三种工作模式,并具有RS485通信功能。经测试,该直流电子负载运行平稳,控制速度快、精度高,具有一定实用价值,可应用于电池等出厂测试。     

基于MSP430医用制氧机控制系统的设计与实现

详细介绍了基于美国TI公司的超低功耗芯片MSP430F149医用制氧机控制系统的工作原理以及软硬件的设计方法,并简单介绍了医用制氧机的工作流程、原理及结构。该系统应用了MSP430F内置的高精度A/D转换器来实现对各个关键参数的检测及控制,其优势在于充分利用了MSP430的内部资源,使得外围元器件很少,功耗极低。特别的,A/D转换器有较高的转换速率,最高可达200Kbps。开发成本低。     

基于单片机的数字存储式示波器设计与实现

介绍一种基于单片机和点阵液晶的简易数字存储式示波器的设计方案。系统以MSP430F149低功耗单片机为控制核心;采用高速A/D芯片ADS830E采集信号,FIFO高速缓存IDT7204同步存储采样值;采样数据经单片机运算处理后,送点阵液晶12864进行显示。重点讨论数据处理和图形显示的软件设计。该系统具有可靠性高、采样频率高、成本低等优点。     

基于MSP430及PROFIBUS的监测子站设计

应用MSP430F149及SPC3芯片实现了具有PROFIBUS-DP总线的减速机状态监控子站,能够监控振动、轴温、转速、电机的电压和电流,同时具有LCD显示、参数存储功能.实现了减速机的在线智能监控.     

基于MSP430F149的串口服务器设计

MSP430微处理器具有功耗低和功能模块丰富的特点。采用MSP430F149为主控制器和以太网控制芯片CS8900A设计串口服务器,并且嵌入精简后的TCP/IP协议。以过程控制设备为目标进行调试,实现RS-232串口和网络接口RJ45的转换。使串口设备联入以太网,实现远程网络控制。     

基于MSP430的无功补偿系统设计与实现

针对电网中无功补偿问题,介绍了一种基于MSP430F449的无功补偿系统,简要地论述了系统的硬件和软件设计.系统能够通过430F449内部自带的A/DC12模块实现电流、电压的采集,同时利用定时器的捕获功能来计算信号相位差,求得输出控制量,控制自动投切并联补偿电容器组,实现系统的无功补偿.     

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.