基于DSP和CPLD的无位置传感器无刷直流电动机控制系统

本文提出了一种基于DSP＋CPLD的无位置传感器的无刷直流电动机控制系统,该系统以DSP控制器TMS320LF2407A为控制核心。它研究了转子位置的检测,同时,进行了该控制系统的控制策略分析和硬件电路及应用软件设计。采用专家智能系统以实现换向控制,使用外部参考电压提高DSP的A／D转换精度。该系统大大简化了硬件结构,使电机控制更加稳定。     

基于DSP的遥测数据压缩系统硬件电路的实现

主要介绍了一种基于DSP的数据压缩系统的硬件电路的实现过程,文章把整个硬件系统分成2个模块来介绍:数据采集模块以及DSP解算模块.数据采集模块采集前端信号在CPLD的控制下经过AD和FIFO把数据写入DSP解算模块,DSP接收到信号后,把数据进行压缩.每个模块从核心器件的选择、硬件电路的总体设计方案以及实现过程进行了介绍.实验表明该方案是行之有效的.     

基于FPGA和DSP的光纤信号实时处理系统

设计了一种基于FPGA和DSP的光纤信号实时处理系统,介绍了系统的硬件组成和工作原理.该系统采用FPGA实现数据的高速采集和逻辑控制,用DSP实现传感信号的全数字解调,分析了载波相位延迟对解调输出的影响并采取了纠正措施.     

MCU与DSP的SPI通信设计

伺服控制器的实时性对工控系统至关重要。本文提出一种伺服系统的多处理机方案,着重阐述系统中MSP430与DSP之间SPI通信的硬件设计和软件实现,给出MSP430与DSP之间通信的通信协议,并应用这种协议实现MSP430与DSP之间的通信。该设计方案不仅满足系统实时性要求,而且简化了系统结构,增强了系统的可靠性。     

基于FPGA的高频逆变装置的变频移相控制实现

为实现电动汽车无线充电系统中逆变部分的有效控制,比较分析了高频逆变器移相控制和调频控制的特性,确定了移相和调频相结合的方案;提出了实现该方案的DSP+FPGA的控制硬件构架,主要描述了控制构架中FPGA根据DSP指令进行实时移相调频的实现原理,以及FPGA中的硬件语言设计,提出了该原理容易出现的窄脉冲的避免办法;最终在11 kW无线充电高效高密度地端功率装置中进行验证,实现了频率和相位更新时PWM波的无缝切换以及逆变器在系统中的有效控制,装置通过调节移相角可以稳定工作在不同功率范围,工作效率均超过国标要求的92.5%,证明了该控制方法的正确性,且满足了实际工程的需求。     

基于DSP的多电机控制系统

文章介绍了一种基于DSP的多电机控制系统的设计,给出了系统主要硬件电路和软件的实现方法。该系统采用1片DSP芯片(TMS320F2812)实现了对2台异步电机的控制,采用SVPWM方法对2台电机进行变频调速,具有高性价比的特点。实验结果表明该设计方案切实可行,具有广泛的应用前景。     

基于DSP的以太网通信接口设计

介绍了以DSP为核心具有以太网接口的系统的硬件电路组成和软件设计方法。对系统硬件设计进行了介绍,详细地介绍了网络控制器RTL8019AS的工作原理及DSP硬件电路设计。在DSP中实现了简化的TCP/IP协议栈,通过软件编程实现数据包的接收与发送。该系统可以将数据按照网络协议处理,实现数据的以太网传输。     

伺服控制系统的DM9000A以太网接口设计

采用以太网控制器DM9000A,实现DSP+FPGA伺服控制系统的100M以太网接入.介绍了DM9000A的功能原理,给出了该器件与TMS320F2812 DSP的硬件连接方法、软件初始化及数据收发控制流程.     

基于FPGA的卡尔曼滤波器的设计与实现

采用 FPGA 硬件实现卡尔曼滤波器,解决了采用 DSP 软件方法实现存在的并行性和速度问题。以基于 FPGA 的数据采集系统为硬件平台,根据模块化设计思想,采用 VHDL 编程实现ADS8364芯片控制模块,利用 FPGA 的系统级设计工具 DSP Builder 设计卡尔曼滤波器模块,给出模块的软件仿真结果并完成整个系统的硬件验证。结果证明了设计的正确性,同时表明采用 DSP Builder使卡尔曼滤波器的 FPGA 硬件实现更加简单,速度更快。     

基于DSP机器视觉的矩形类物体识别研究

针对机器人控制对视觉的实时性要求,设计了一种基于TMS320C6416图像处理平台的嵌入式机器人视觉系统.本系统以VC 6.0为平台来开发控制DSP的操作界面,通过该操作界面控制DSP对矩形类物体图像的采集、处理和识别,后DSP把识别的结果传送给主机,为机器人手臂的轨迹规划提供目标物体信息.文中给出了系统的硬件设计方案和软件实现过程.     

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。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

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     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

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.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.