网络化动态轨道衡监测系统的设计与实现

介绍了网络化动态轨道衡监测系统的设计,分别阐述了系统的硬件设计和软件设计.硬件部分主要包括A/D转换电路,放大滤波电路,网络通讯接口电路和电源电路,为提高系统整体精度设计中采用了高精度的16位AD转换芯片AD7655,通讯方式采用以太网通讯;软件包括上位机和下位机两个模块,主要实现数据采集、以太网通讯、车体判别、数字滤...     

VXI内嵌式控制器的硬件设计与实现

VXM内嵌式控制器是VXI总线测试平台的重要硬件平台。介绍了一种基于嵌入式PC的VXI内嵌式控制器的硬件设计与实现,并以PCI－VXI总线接口设计为重点,详细讨论了同步／异步总线转换电路、具有系统控者能力的VME接口电路以及VXI扩展电路的设计与实现。     

基于ICL7135的温度控制仪

硬件以AT89C55WD单片机为核心,由键盘和LED显示电路、单片机系统、控制信号隔离输出电路、PT100热电阻AD转换电路等几部分组成.采用ICL 7135与单片机的串行接口电路,可大大节约CPU的接口资源,简化电路设计,AD转换精度高,对单片机设计人员具有一定的参考意义.     

基于CS5467的电源转换效率测量系统的设计

在测量芯片CS5467的基础上设计了一种电源转换效率测量系统。论述了测量系统的工作原理和软、硬件设计,并以单片机STC12C5410为核心设计了SPI接口通信电路。     

DSP应用系统中的硬件接口电路设计

介绍了DSP应用系统的硬件接口电路:包括电平变换电路.仿兵器JTAG接口电路.以及可扩展的硬件接口(如A/D.D/A.SRAM)等的设计方法,并给出了接口电路在设计时须注意的几个问题.     

USB接口便携式中频电疗仪的设计

为解决传统治疗仪体积庞大不便随身携带、处方固定易被肌体适应从而降低治疗效果的问题,设计了一款基于USB接口的便携式中频电疗仪。硬件电源采用USB接口供电,功率输出部分采用甲乙类互补对称功率放大电路并结合环形磁心变压器。系统电路包括USB接口电路、电源转换电路、D/A转换电路及功率放大电路。软件部分开发了USB固件程序、USB驱动程序及客户端应用程序。医生可根据患者的治疗反馈信息,重新编写处方或添加最新专家处方,提供远程帮助。该装置体积小,质量轻,轻便易携。     

华诚HC320中西文字符图形终端主控板硬件设计

介绍了当前终端主控板硬件设计的现状，ＨＣ３２０中西文终端的硬件构成，以及ＨＣ３２０的ＣＰＵ、内存管理、显示电路、通信接口电路、打印接口电路和键盘接口电路的设计。     

门禁系统视频监控电路设计

本文主要介绍了基于FPGA的视频监控主机系统硬件设计中的多路视频采集电路、USB接口电路、串口转换及通信电路、EEPROM电路等电路的设计,单片机和FPGA的并行使用,可以使数据传输更加协调,提高系统可靠性.该硬件系统能够实现视频信息的存储及传输,报警信息自动存储,USB信息拷贝,允许多路同时报警及远距离控制云台等功能,使得监控控制系统工作效率有了进一步的提高.     

新型棉花自动取样系统的设计

棉花取样监控系统是建构于Windows系统平台下的32位并兼容16位的实用硬件,软件综合系统。其包含检测相应对象的数据采集转换,控制的硬件接口电路以及匹配的软件系统。它采用8路红外线传感器检测、转换、光电隔离、整形接口电路等自动检测有无棉花在上花通道通过,并将信号送入计算机。     

基于CPLD的某型航管应答机控制接口设计

针对某型航管应答机串行控制接口电气特性、时序关系和数据定义的特殊要求,设计了以CPLD最小应用系统为核心,并扩展RS-232和三线控制接口电平转换的硬件电路,编制了基于计数器触发的输出接口信号状态转换程序,实现了RS-232接口与航管应答机三线串行控制接口信号的转换,较好地解决了航管应答机自动测试系统中控制接口电路的适配问题;该控制接口通过扩展输入和显示模块,可独立实现对航管应答机的功能控制和状态指示;通过改变计数器数值与输出接口信号状态转换之间的关系,可方便地调整三线串行接口信号的电平、时序、占空比等参数;应用结果表明,该控制接口具有性能稳定、使用方便、扩展性强等特点。     

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.