基于时序的单片机多任务系统驱动策略

在单片机系统开发中，多任务系统容易出现调度阻塞。本文分析了产生任务阻塞的原因，提出了一种基于时序逻辑的多任务驱动策略，通过具体案例设计了常用外围模块的多任务驱动模板。实验结果表明，该多任务系统调度策略能够有效保证多任务系统运行流畅，有效解决了多任务阻塞问题，为基于单片机执行多任务系统开发提供了一个新思路。     

大型三维真彩色喷墨控制系统

针对三维喷绘机器人的作业需求,设计了一种基于FPGA的大型三维真彩色喷墨控制系统.系统以Virtex-Ⅱ Pro FPGA内嵌的PowerPC405硬核为中心,通过移植Xilkernel嵌入式操作系统和LwIP网络协议,搭建了一个多任务实时处理平台;并自主设计了满足喷头控制时序的IP核及相应驱动,硬件协加速单元在位置触发信号的节拍控制下执行喷墨过程.试验结果表明,系统灵活性较强,实时性较好,能够准确、高速地进行三维真彩色喷墨.     

基于FPGA的软硬件统一多任务模型及功能调度技术研究

为了解决工业控制计算机中的基于FPGA的可重构模块的任务调度问题,提出了一种基于FPGA的软硬件统一多任务模型建立及功能调度方法。该方法中包括基于FPGA的软硬件统一多任务模型建立及功能调度方法的设计思路和实现过程。该方法通过对软件和硬件任务特性以及FPGA的在线配置与部分动态重构的研究分析,建立了软硬件任务的统一模型,从而实现了对软硬件任务的统一调度,有效的提升了资源的利用效率。该方法应经投入应用,在应用过程中取得了良好的效果。     

基于ARM和VxWorks的PC104总线模块检测系统

PC104总线在嵌入式系统中应用十分广泛,近年来,ARM微控制器凭借其强大的功能,逐渐占据了市场的大部分份额.文中针对利用ARM微控制器控制PC104模块,提出了一套软硬件解决方案;在硬件设计中,FPGA在不同时序的转换中起到了关键性的作用;基于VxWorks操作系统实现了PC104模块的通用驱动设计和库的设计;针对网络应用,实现了基于双缓冲队列的多任务程序设计.     

基于ARM和FPGA的多通道信号模拟系统设计

信号模拟系统在设备测试、数据处理等领域都有重要的意义;为了解决设备测试对多通道同步信号的需求,提出了一种基于ARM和FPGA的多通道信号模拟系统设计方法,主要介绍了以FPGA为核心的模拟输出控制模块,其中采用ARM进行多任务管理,用FPGA实现时序转换和控制,FPGA的控制逻辑采用VHDL和原理图相结合的方法设计,使用FPGA提高了系统性能并简化了外围电路设计,最后给出了模拟系统的实验结果,整个设计系统可模拟输出多路0.01Hz~40MHz的任意信号,说明了这种设计方案的有效性。     

基于消息驱动的多任务操作机制

本文对多任务操作机制与传统的单任务操作机制进行了比较，分析了多任务系统中数据交换的方法，特别是目前最为流行的用消息驱动方式实现的系统，结合程控交换机软件的实际，文章对基于消息驱动的多任务应用程序作了探讨。     

FPGA的可重构测控系统应用设计

可重构器件技术的发展和测控系统结构模式的通用化是实现可重构测控系统的前提。通过对常规计算机测控系统存在的问题、结构模式和多任务特征以及可重构器件技术发展的分析,提出基于FPGA器件设计可重构测控系统平台的设想,对可重构测控系统设计原则、硬件结构单元设计和软件重构方法进行了分析,并给出应用于雷达信号实时侦测的基于CPCI总线的可重构测控系统硬件设计的实例。     

基于FPGA的集成式步进电机驱动器的研究

提出了一种基于FPGA的新型集成式步进电机驱动系统实现方案,该方案采用模糊自组织PID调节方法实现对步进电机驱动系统的闭环控制,提高了系统的自适应能力.利用FPGA上嵌入的微处理器PicoBlaze将步进电机驱动系统的控制器和驱动器集成在一片FPGA芯片上,实现了可编程片上系统设计,极大地提高了控制性能.     

卫星制导弹药低成本飞控计算机系统设计

为满足某型卫星制导弹药飞控计算机系统的特殊要求,设计了一种基于浮点数字信号处理器TMS320C6713B FPGA的嵌入式导航计算机系统.系统通过采用大规模可编程器件FPGA,充分利用FPGA资源,进行合理的功能分配,不仅简化了硬件系统的设计,而且使得系统的功能设计更灵活;在此基础上,通过采用DSP/BIOS多任务多线程实时操作系统,进一步提高了系统软件的实时性和降低了软件编制的复杂性.     

基于FPGA的科氏质量流量计数字驱动系统设计

气液两相流工况下,科氏质量流量计流量管固有频率变化剧烈,需要驱动信号快速跟踪速度传感器信号。针对这种情况,设计了基于现场可编程门阵列(FPGA)的科氏质量流量计数字驱动系统,包括电路部分和程序部分。电路部分由信号调理电路、数字驱动电路等组成。程序部分使用硬件描述语言(Verilog HDL)编写,执行数据通信、无限冲击响应(IIR)数字滤波和计算驱动参数等。在单相流工况下,对基于FPGA驱动系统的变送器进行了水流量标定试验。试验结果表明:相对误差小于0.1%,重复性优于0.05%。在气液两相流工况下,将基于FPGA的数字驱动与基于数字信号处理器(DSP)的数字驱动的驱动效果进行对比。对比结果表明:FPGA驱动的驱动效果优于DSP驱动的效果。     

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。