一种基于DALI总线的智能LED照明系统的设计

为了提高智能照明系统的性价比,提出了一种基于DALI总线的智能LED照明设计方案,关键技术包括DALI控制模块和可调光驱动电源的设计。系统通过应用微控制器（MCU）、通用的模拟和数字电路来代替昂贵的DALI专用芯片,实现了DALI控制的功能;LED驱动电源应用软开关技术,具有DALI接口和多种传感器接口,并具有应急照明的功能;系统可实现对LED灯的PWM调光和智能化控制。制作了样机并进行了相关实验,验证了方案的可行性。     

51单片机和HD7279A的接口与编程

HD7279A芯片与MAX7219芯片的功能类似,能驱动8位共阴式数码管（或64只独立LED）的智能显示驱动芯片,不同的是该芯片同时还可连接多达64键的键盘矩阵。单片可完成LED显示、键盘接口的全部功能。该芯片具有片选信号,可方便地实现多于8位LED显示或多于64个键的键盘接口。     

带有过温保护功能的1W白光LED驱动电路设计

基于CSMC 5V0.6μm标准CMOS工艺设计研制了一种具有过温保护功能的1W温度传感LED恒流驱动电路.该电路由恒流驱动模块和温度传感模块组成,在电源电压为5V时能提供350mA恒定驱动电流,并能在设定温度下关断功率MOS管,实现过温保护功能.恒流驱动模块采用比例电流采样方式,在电源电压正负变化10%范围内,驱动电流变化小于4.3%,温度传感模块利用PTAT(与绝对温度成正比)电压与基准电压比较,产生关断信号,关断温度在50℃-125℃范围内可由外接电阻设定.该芯片实现了温度传感模块和白光LED恒流驱动模块的单片集成,在LED照明技术中有一定的应用价值.     

基于反激式LED驱动芯片的可控硅调光设计

分析了LED驱动电源设计中的可控硅调光.设计能兼容现行大多数调光器的LED电源是降低LED成本、迅速取代当前节能照明技术的关键.系统地分析了三端双向可控硅的工作原理和LED驱动电路调光的难点,提出了加入damping电阻解决可控硅调光与LED兼容问题的方案.该设计基于AC-DC电源芯片MT7920,并加入了一种相位补偿...     

基于AMC7150的乳腺癌诊断系统设计

将小波分析技术应用于生物医学工程领域,基于AMC7150芯片的LED驱动电路原理,设计了一种可调光双波长近红外(NIR)乳腺疾病诊断系统,能够有效分辨乳腺组织的病变特性.通过临床试验验证,该系统的调光功能能够适应不同致密性的乳房,拍摄出清晰有效的图像,并作出准确的诊断,具有很好地临床应用价值.     

节电控制装置中键盘显示电路设计

本文针对节电控制系统键盘和显示电路,简要介绍了键盘及LED驱动芯片ZLG7290的功能,结构和工作原理,给出了单片机与ZLG7290的硬件接口电路设计,并采用汇编语言实现了单片机对ZLG7290的读写,其设计简单可靠,编程容易,成本低,在各种工业控制系统中具有广泛的应用前景.     

内嵌Modbus协议的通用监控模块

针对工业自动化设备中大部分监控仪表功能单一、结构各异等不足,设计了一个使用51系列芯片的通用监控模块.该模块采用STLED316S芯片驱动8段LED,16位通用A/D转换器AD7705进行模拟信号采样,以及SHT11和DS18B20进行温湿度采样,并可通过内嵌Modbus协议实现远程设置和访问采样数据;同时,基于稳定性考虑,设计并实现了一个固定优先级和固定调度顺序的分时操作系统.实际工业现场应用证明,该模块成本低、稳定可靠,具有广泛的应用价值.     

STN-LCD驱动控制芯片的ASIC研究与设计

文章介绍了一种STN-LCD驱动控制芯片的设计方案.整个设计采用"自顶向下"的设计方法将芯片进行层次化功能划分,同时,参考已有的同类驱动控制芯片的设计经验,原理图输入设计和Verilog编程以及综合技术对模块进行设计.重点讨论分析了其关键部分一接口时序、控制电路和驱动电路的设计.对所设计的驱动控制芯片的数字部分功能和模拟部分功能分别采用modelsim仿真和cadence spectre仿真验证,符合所设计的芯片要求.该芯片可以甩在手机、数码相机、MP3、MP4等产品的显示屏驱动.     

基于MAX7219的LED．显示系统

介绍了一种采用可编程显示驱动芯片MAX7219构成LED显示系统的方法。MAX7219采用串行接口技术,可通过编程设置显示功能。具有外部占用引线少、显示亮度可调节、一片能驱动多个LED数码显示器、外围接口电路简单、使用方便等诸多优点,因而大大简化了硬件电路。对常规的LED显示驱动电路作了比较后,给出了具体的接口电路和接口程序。     

单片机系统中的LED显示译码驱动电路

LED显示在单片机系统中应用广泛,它能够直观地向人报告系统运行状态与结果.论述单片机应用系统中LED显示译码驱动电路的几种实现方案,比较每种方案各自的优缺点,着重介绍了专用显示驱动芯片MAX7219的工作原理与应用方法,指出专用译码驱动芯片在单片机系统显示应用中的广阔前景.     

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.