新型分布式智能楼宇电源无线控制系统的设计

针对园区智能楼宇群的供电电源高效控制问题,提出了一种分布式无线控制系统设计方案;整体分为监控中心节点和分布于各楼宇的控制节点,彼此通过ZigBee网络实现高速互联;中心节点采用上位机/下位机结构,利用USB总线实现高速数据传输,基于LabWindows/CVI虚拟仪器技术实现上位机的软件研发,为用户提供了友好、高效的控制平台;楼宇控制节点基于嵌入式微处理器MSP430和开源实时操作系统μC/OS-II设计实现,采用多路双向可控硅精确控制电源的状态切换;测试表明,系统具有可靠高效、灵活实用及响应快速等特点,具有较高的应用和推广价值。     

基于LabWindows/CVI的虚拟数字滤波器的设计与实现

LabWindows/CVI是测控领域最为流行的虚拟仪器软件开发平台之一。在概括分析了LabWindows/CVI语言的特点的基础上,介绍了一种基于CVI的虚拟数字滤波器的设计思路和基本方法,并给出了仿真运行结果,验证了其可行性和有效性。     

基于虚拟仪器的发动机台架试验测控系统

基于虚拟仪器的发动机台架试验测控系统,在Windows环境下采用LabWindows/CVI开发应用程序,具有良好的人机界面。该系统能够完成发动机常规性能试验,实现了发动机台架试验测量、控制、记录、数据处理的全自动化。     

新型智能楼宇燃气管网泄漏监测系统的设计

针对智能楼宇的燃气管网泄漏监测问题,提出了一种基于ZigBee无线网络的新型分布式自动监测系统的设计方案;整体系统由多个分布在楼宇各主要燃气管口的监测节点和一个安装在监控室的中心节点构成;基于ZigBee芯片MC13192、ARM微处理器LPC2124、甲烷传感器及RS-232总线开发技术实现了系统硬件;基于VC++、ACCESS数据库及嵌入式C语言研发了系统软件;试用结果表明,该系统平均响应时间仅为3.56s、燃气泄漏浓度的平均检测精度高达98.6%,具有精度高、鲁棒性强、反应速度快及运行安全稳定等特点,能够很好地满足智能楼宇燃气管网泄漏的高精度自动化监测需求。     

基于多通信模式的分布式测控系统设计与应用

基于车辆新型供电体制测试需要的目的,综合虚拟仪器技术和多种通信网络技术,构建了一个包含多种通信模式的分布式测控系统;并采用虚拟仪器软件LabWindows/CVI,借助串行通信技术和以太网络技术,编制应用程序;实现各子测控系统数据采集、初步分析和控制指令发布的功能;完成各子测控系统与远程监控终端的数据传递,使远程监控终端对整个系统运行的情况进行直观的实时图形化显示,并能对整体的实验数据进行统计、分析和实验结果的输出.     

基于虚拟仪器技术的风洞测控系统设计

介绍了虚拟仪器技术的概况及其在风洞测控系统中的应用。基于虚拟仪器的风洞测控系统,由模块化硬件和软件组成。硬件由传感器模块、控制器、数据采集板、运动控制卡及信号调理模块组成。利用软件开发工具LabWindows／CVI进行了系统的软件设计。最后,对系统的抗干扰方面作了简要的介绍。     

LabWindows／CVI在电机测控系统中的应用

分析了LabWindows／CVI的特点,介绍了其在虚拟仪器开发中的应用。并以电机测控系统的开发为例,详细讲解了使用LabWindows／CVI开发应用程序的过程。     

基于VXI技术的动静态参数测控系统的集成与开发

介绍了多参数综合测控系统开发的一个实例。系统以VXI仪器构建 ,并以专用测控软件开发平台LabWindows/CVI来开发 ,体现了虚拟仪器的思想。说明了利用软硬件结合对仪器功能进行扩展的一些方法     

基于LabWindows/CVI的排水管道机器人测控系统设计

介绍了国内排水管道现状及检测与维护情况,针对排水管道机器人特殊的作业环境,设计了一种基于LabWindows/CVI的排水管道机器人测控系统。该系统以PLC为核心,采用电涡流位移传感器与摄像头结合检测管道缺陷,引入模糊控制算法,增强了系统的鲁棒性和可靠性。通过基于LabWindows/CVI虚拟仪器设计的上位机软件与下位机PLC实时通信,实现了系统对机器人动作的控制,以及数据的采集、处理、存储、显示等功能。整个系统人机交互简单、抗干扰性强、可靠性好,可满足机器人作业时的清理和检测要求。     

LabWindows/CVI中Excel报表技术研究

在测控系统中,虚拟仪器是由模块化硬件配合软件组成的,具有较高的灵活性和扩充性,因此,广泛应用于测控领域.通常测控系统利用ActiveX输出数据报表,该方法较复杂,而虚拟仪器软件开放平台LabWindows/CVI简化了数据报表的输出.详细阐述了用LabWindows/CVI的excelreport.fp仪器驱动访问Microsoft Excel的方法,提出工程中常出现的报表格式相同而报表数不确定的解决方法,针对excelreport.fp仪器驱动不能复制的功能缺陷,提出了解决方法.并通过工程实例验证了该方法,说明其有很高的工程应用价值.     

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.