多通道高精度通用电池测试系统

介绍了所设计的多通道高精度通用电池性能测试系统,并对实现大容量电池充放电的PWM控制方法进行了讨论和比较。该测试系统已用作电动汽车电池容量检测的实验平台。     

基于感应耦合比率臂的高精度位移测量系统

讨论了比率测量方法的优点,介绍了运用感应耦合比率臂和差动式电容位移传感器设计的高精度微小位移测量系统。给出了一种实验系统的设计例子和主要的测试结果,说明了该设计在小位移测量中的有效性。     

手持式电子鼻的实现

本文介绍了电子鼻的概念、应用及其发展历史,在电子鼻系统原理的基础上阐述了如何设计实现手持式电子鼻,并详细阐述了手持式电子鼻的各个组成部分及其实现的关键技术,最后总结了一些设计的原则,手持式电子鼻由于其成本低、易携带、通用性好、能现场即时检测等特点在市场上将会有广阔的应用前景.     

导弹动态测试系统设计

导弹的动态测试是导弹测试中的一个重要组成部分,它贯穿于导弹的设计、使用、储存的整个生命周期,因此选取合适的动态测试方法对导弹测试来说有着重要的意义和作用;着重介绍了单一频率的正余弦信号动态测试法原理,在工程实现上,利用PC/104总线组建高可靠性、高精度的导弹动态测试系统,重点介绍了测试系统的软硬件设计;该系统不但能够自行产生测试所需的激励信号,而且能够自动完成数据采集、结果处理等任务,极大地提高了动态测试的自动化程度。最后对该系统的进一步扩展进行了阐述。     

基于VXI总线的测试平台与故障诊断系统设计

针对武器装备测试平台与故障诊断系统的特点和设计要求 ,讨论了该系统的组成与实现方法 ;并以某型武器装备为例 ,重点介绍了一种基于VXI总线的测试平台与故障诊断系统的设计方法 ;最后探讨了实现软、硬件结合的技术途径。     

发展中的电子鼻技术

介绍了电子鼻的概念和研究意义,详细地阐述了电子鼻的系统组成及其关键技术,最后对电子鼻的应用和前景做了总结。     

感知传感器的高精度高分辨率采集系统设计

随着小型化、高精度、低功耗、智能化感知传感器的快速发展,传统采集系统已无法满足高精度要求.设计一套能够测量感知传感器输出微弱电信号的高精度高分辨率采集系统,该系统选用了CodexM4系列处理器STM32F411与分辨率为24位的串行模数转换芯片AD7714,提出了一种基于改进型滑动平均滤波算法的滤波方案.详细介绍了该系统的软硬件设计方案,最后利用模拟感知传感器进行了原理样机的静态精度测试,测试结果表明,基于感知传感器的高精度高分辨率采集系统能够满足高精度、实时性好、稳定可靠的设计要求.     

基于单片机的实验环境参数记录仪的设计

针对高精度的存储测试系统中很少利用实时记录的实验环境参数对其进行校准,文章设计了一种利用MSP430FG4618单片机采集与实时显示实验环境参数如温度、湿度、大气压、风速及风向的超低功耗实验环境记录仪;详细介绍了记录仪的电路结构和工作原理,对温度、湿度、大气压、风速及风向等多通道数据进行通道选择、数据采集、数据处理以及液晶显示;该方案设计的记录仪功耗情况比较理想,在上电初始化进入低功耗模式时,系统电流不超过25μA。测试结果可为高精度存储测试系统数据校准提供依据,并对提高监测系统便携性、降低成本和功耗,有一定的参考价值。     

高速高精度ADC动态参数评估系统的设计与实现

高速高精度模数转换器(ADC)广泛应用于信号处理领域,其动态性能直接决定系统性能的优劣;由于实际使用的芯片与设计的额定指标间会存在偏差,有必要评估ADC的实际动态性能;基于FPGA及Labview实现了一个低成本、高可靠性的高速高精度ADC性能评估系统;系统由底层控制待评估ADC子卡,提供精确的采样样本;采用异步FIFO进行数据缓存, DMA方式优化数据存储;Labview定义通信模块,结合Matlab测试脚本完成动态参数测试;最后使用ADI公司的AD9467进行了测试验证;实验结果表明,该系统运行稳定,与datasheet相比,参数误差不超过1.89%,达到了IEEE Std 1241-2000的测试标准,降低了测试系统构建难度和成本。     

实时嵌入式产品的测试系统设计

主要介绍针对高实时性的嵌入式产品而开发的测试系统的设计,简单介绍了被测试系统的特性,从整个测试系统的设计思想、设计原理,包括软件和硬件等方面,给出详细的介绍。另外,比较了不同方案设计的优缺点,为开发同类测试系统提供几种不同的思路。最后简单讨论了本文使用的用例管理软件。     

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.