基于定时中断编程的直线电机模型参数辨识研究

研究了基于定时中断编程的直线电机模型参数辨识技术。推导了直线电机的数学模型,建立了一个永磁同步直线电机驱动的单自由度实验台的硬件及软件系统。采用定时中断编程技术,在DOS下运行C语言程序,采集工作台位移数据,经数据处理,得到直线电机力常数为13．1N／A,与理论值较好吻合。     

皮卫星多传感器同步采集系统

针对多传感器实时同步采集的任务需求,基于数字信号处理(DSP)+现场可编程门阵列(FPGA)架构设计内部集成电路(I2 C)总线与同步启动信号相结合的自定义通信协议,通过虚拟直接存储器存取(DMA)与实时中断响应系统设计,实现数据采集、数据存储以及数据下传过程同步进行的皮卫星高精度多传感器实时同步采集系统.实测结果表明:系统实现了84路传感、100 Hz采样,同步精度优于10μs,系统已应用于某型号皮卫星.     

车载无人机的多路影像采集与拼接

为提高无人机(UAV)采集全景影像的效率,采用基于ARM内核的高性能影像编解码处理器,以Linux为操作系统,搭载多路影像传感器,构建了一种适合无人机平台的多路影像同步采集的嵌入式系统.设计了软件多线程同步采集模式及基于Qt与OpenCV视觉库的多影像拼接界面,实现了全景影像的多角度实时同步获取及多路影像的拼接.系统软硬件联调与实验结果表明:该系统能成功完成多路影像数据的同步采集拼接处理,操作方便,达到了预期的要求和效果.     

基于FPGA的液体火箭发动机控制监测系统研制

随着液体火箭发动机内部结构日益复杂,传统的控制遥测模式难以满足测控需求;针对液体火箭发动机的智能化需求,为实现高效的发动机状态管理和运行参数的实时监测,研制了一种基于现场可编程门阵列（FPGA）的控制监测系统;控制监测系统拥有24路发动机驱动控制能力,具备了32路信号同步采集、实时处理与存储能力,能够实现同步RS422总线通讯,并具有HDLC(High-Level Data Link Control)协议数据的编解码能力;实验结果表明,控制监测系统能够对发动机阀门进行驱动控制及发动机状态参数的实时采集,实现基于HDLC协议的数据通讯;以硬件为核心的控制监测系统提高了发动机电器系统的集成性,提升了系统可靠性,为发动机健康管理、故障诊断算法的搭载奠定硬件基础。     

电磁场效应下HR神经元的全局分岔与参数辨识

详细分析了在磁通变量和电场变量共同作用下五维Hindmarsh-Rose(HR)神经元模型的全局分岔行为.通过数值仿真的方法,做出该神经元系统的双参数分岔图、峰峰间期(ISI)分岔图和最大Lyapunov指数图,发现该系统在双参数平面上具有倍周期分岔、逆倍周期分岔、加周期分岔等分岔模式以及呈"锯齿状"的混沌结构.此外,基于Lyapunov稳定性理论以及自适应同步的方法,以混沌态时的系统为驱动系统,构建对应的响应系统,选择合适的控制器,实现了驱动系统与响应系统的同步,并辨识出未知参数.数值模拟证明了此方法的有效性和可行性.     

网络多媒体课件非线性编辑系统同步技术研究

详细研究了开发网络多媒体课件非线性编辑系统时需要解决的各种同步技术,给出了基于时间线机制的视音频媒体对象多通道同步实现模型,以及ASF对象与课件资源对象的同步打点技术方案,并结合DES与VC技术给予实现.该系统的研究与开发,使得对网络多媒体课件元数据的实时采集,课件媒体的编辑、同步合成、网络发布等操作更加灵活.     

嵌入式Windows CE设备驱动的研究实现

介绍了Windows CE的体系结构和Windows CE平台定制,详细阐述了驱动的系统结构、中断处理,重点研究了WindowsCE下的本机驱动和流驱动模型.在此模型基础上,以基于StrongArm处理器的彩色LCD(640*480)的WindowsCE驱动程序设计为例,介绍了嵌入式WindowsCE驱动程序的开发过程.     

Windows平台驱动程序新架构分析

文章分析了用Windows驱动程序模型（WDM）设计驱动程序面临的问题,分析了Windows驱动程序架构（WDF）简化驱动程序设计工作的方法,介绍了新构架的概念及基本原理,详细分析了对象及事件回调机制,详细分析了新构架在处理同步问题所采用的线程模型、锁模型、中断同步模型的原理,通过一个基于WDF的驱动程序实例来说明了新架构驱动程序的设计方法。     

基于DAQmx驱动与LABVIEW的数据采集系统设计

DAQmx驱动作为NI公司的第三代数据采集硬件驱动程序,减少了传统数据采集硬件驱动程序带来的编程复杂性,可被多种编程语言调用,程序接口功能强大,应用起来十分方便.研究并使用DAQmx驱动程序开发基于PXI总线的数采系统逐渐成为趋势.针对PXI总线数采系统开发中必须解决的采集同步、触发等关键技术问题,重点讲述在LABVIEW中利用DAQmx驱动实现多块数采卡同步采集、多功能数采卡的模拟与数字信号同步采集的程序设计技术以及数字与模拟信号触发程序设计技术等.利用这些技术可解决大部分基于PXI总线的数据采集仪器设计问题.并结合工程实际,演示了利用DAQmx工具开发的32通道多功能PXI总线数据采集系统.     

一种基于中断的多线程高速图像采集系统

图像采集系统是数字图像处理领域的核心部件之一。在 ＰＣ上开发基于 Ｗｉｎｄｏｗｓ９５／９８的即插即用高速图像采集系统已成为数字图像处理领域的必然发展趋势。针对目前普遍采用的定时器采样方式的缺陷,提出了一种基于事件的多线程帧中断技术以实现高速、准确的图像采集。提出了由虚拟设备驱动程序、标准设备驱动程序以及 Ｗｉｎ３２应用程序组成的三级图像采集系统结构并给出了各部分的完整设计方案及实现细节。特别采用了中断挂接、事件同步、消息传递、双帧存交替以及优先级设定等技术确保图像采集的实时性。     

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。     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。