全数字晶闸管功率控制器的设计

本文介绍了利用RISC结构的单片机作控制核心，设计多功能晶闸管功率控制器的基本思路。描述了功率控制器的硬件模块设计，控制器的各种控制特性分析，同时也介绍了软件的设计要点。实践表明，所介绍的设计方案和使用效果达到了国外同等产品的性能，具有极大的推广和使用价值。     

基于FPGA的分组式直流固态功率控制器的设计

介绍了一种基于FPGA的组合式直流固态功率控制器(SSPC)的设计方案,并对分组控制方法进行了分析.该控制器组利用FPGA的I/O功能可自定义等特点将多个独立工作的功率控制器共享一个控制芯片,用硬件描述语言和IGBT器件实现SSPC基本功能并对多个SSPC独立进行判断管理和提供反时限保护,具有体积小,集成度高,抗扰能力强等特点.最终实现了智能控制负载电路通断的功能.     

人造金刚石生产过程Fuzzy—PID功率控制系统

该文介绍了人造金刚石生产过程数据采集及Fuzzy-PID功率控制系统研制,系统由基于Rs485总线的嵌入式数据采集器/控制器和PC计算机组成。嵌入式数据采集/控制器由51单片机实现,采用C51语言编写数据处理程序;PC机作为监控主机,采用图形化语言LABVIEW开发上位机软件,并具有显示温度、功率等参数曲线、数据表格和存盘打印等功能;控制上采用模糊PID控制算法实现对金刚石压机系统功率的连续精确控制。实践表明,系统达到了设计要求功能和技术指标,取得比较好的测量与控制效果。     

异步电动机DTC系统实验装置的设计

本文给出了基于DSP控制器和智能功率模块(IPM)的异步电动机直接转矩控制(DTC)系统实验装置的设计方案。经测试，此装置有丰富的功能和良好的性能。以此为平台，能方便的开展基于直接转矩控制的各种高性能控制策略的研究。     

小型飞机起落架全电控制器设计

使用多电架构将会使飞行器减少对环境的影响和提高可靠性,同时降低维修成本.因此,航空工业、政府机构和研究所已经把注意力放在功率电传或多电架构上,用电来控制飞机飞行面.针对小型飞机起落架全电控制需求,提出了一种双冗余收放控制器设计方案.该控制器采用DSP为控制核心,能够实现电机四象限运行控制,负载能力达到600Kg,且该系统具有过流保护功能.实验结果表明,该控制器具有很好的速度控制效果,并能准确完成起落架上锁,适用于小功率起落架控制应用场合.     

小型风光互补型并网发电系统一体化控制器的设计

为了实现小型风光互补性发电系统的并网运行,采用DSP芯片为核心单元,提出了一种一体化控制器的设计方案。本文设计的一体化控制器可以实现最大功率跟踪、蓄电池充放电控制、逆变器输出电压幅值与频率的调节和系统并网控制的功能。从一体化控制器的基本构成入手,分析了控制器实现控制功能的基本过程,根据基本过程设计了各个控制单元的软件程序模块。最后,构建了一个太阳能电池板容量为1000W,风能发电机容量为3000W的风光互补型并网发电系统对一体化控制器的控制性能进行了实验测试。结果表明,一体化控制器整体性能良好,能快速、准确的对系统相关环节施加合理的控制指令,维持系统稳定、安全的运行。     

基于正交试验法的直流充电桩功率自动优化控制系统

稳定的功率可以延长直流充电桩的使用寿命，为了提高直流充电桩功率控制的稳定性和吻合度，提出了基于正交试验法的直流充电桩功率自动优化控制系统。通过设计脉冲宽度调制信号采样电路、直流充电桩功率自动优化控制的驱动电路和直流充电桩功率自动优化控制器，完成系统的硬件设计，在系统的软件设计中，利用正交试验法调节了直流充电桩的充电功率，通过制定直流充电桩功率自动优化控制策略，实现了直流充电桩功率的自动优化控制。测试结果表明，文中系统在直流充电桩功率控制中，具有良好的稳定性和吻合度，控制功率与理想功率差值小于15.6 W,均方误差低于0.28。     

基于DSP和CPLD的移相全桥软开关电源数字控制器

随着大功率开关电源的发展,对控制器的要求越来越高,开关电源的数字化和智能化也将成为未来的发展方向。本文介绍了一种基于DSP和CPLD的移相全桥谐振软开关数字控制器,应用于开关电源的数字化智能控制。该数字控制器采用DSP(TMS320LF2407A)作为主控制器芯片,配合CPLD移相波形死区生成技术,具有功率器件驱动、保护,外部通讯(CAN总线,RS232)和外部设备控制功能,实现了可编程控制、数据通讯、智能化控制等功能,具有很好的应用前景。     

基于压缩采样的电力系统负荷频率自动控制研究

为降低新能源接入对电力系统的影响，研究了基于压缩采样的电力系统负荷频率自动控制方法。利用匹配追踪算法对采集到的新能源发电输出功率信号进行稀疏表示，并将稀疏表示后的信号投射至测量矩阵得到低维的测量值。在测量值范围内，运用L₁范数优化方法得到重构后新能源发电输出功率。将该功率与期望功率的偏差作为扰动项，接入基于比例积分(PI)控制器的负荷频率控制模型。利用变论域方法调节PI控制器输入与输出论域。根据模糊推理定义伸缩因子，构建变论域模糊PI控制器使之作用于负荷频率控制模型，完成电力系统负荷频率的自动控制。试验结果证明：该方法控制后的输出功率稳定，负荷扰动下区域控制偏差和频率偏差小，电力系统负荷频率自动控制的精度最高可达99%,具有实用性。     

机电一体化茶青超声波清洗机的设计开发

介绍了一种基于PIC单片机控制的超声波茶青清洗设备，给出了系统及结构的设计、单片机控制电路和功率放大电路的设计，并较详细地阐述了几种换能器的性能比较和控制器的工作原理及结构，使其具有（超声波加气泡发生器）的恒功率清洗功能，满足了茶青表面杂质清洗及去除农残的要求。经试验证明：超声波清洗速度快、效果好、容易实现工业控制，能保持恒定输出功率，且可以方便地调节。     

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.