32位RISC微处理器FPGA验证平台设计与实现

微处理器的验证工作是一项复杂而重要的工作。针对传统的FPGA验证在板级验证过程中存在不能快速定位错误和调试方法单一等问题,同时结合“龙腾R2”微处理器的验证需求,设计了“龙腾R2”微处理器的FPGA验证平台,在该验证平台上成功进行了指令和VxWorks操作系统的测试。实践表明该验证平台大大缩短了验证周期,整个验证平台原理清晰,结构简单,扩展灵活、方便。     

基于FPGA的SoC/IP 验证平台的设计与应用

采用Altera公司CycloneII系列的FPGA设计了一个基于片上总线的SoC原型验证平台,并将VxWorks嵌入式操作系统应用于此平台,通过软硬件协同验证方法,验证了平台的可靠性。该平台在CF卡及通用智能卡SoC芯片验证中得以应用。     

基于嵌入式微处理器的VxWorks系统移植*

提出一种以嵌入式微处理器为核心,移植VxWorks操作系统的方法.通过对VxWorks输入/输出系统的分析以及中断处理和异常处理过程的研究,设计了相应的外围器件,成功实现了VxWorks操作系统的移植.     

手机智能卡高效可重用SoC验证平台设计

大规模系统芯片的设计必须依靠完整的验证来保证其正确性。高效、可重用的验证平台是必需的。该文采用便于调试的独特内存映射方式,将实时、多任务的VxWorks嵌入式操作系统应用于验证平台。该平台可对AMBAVIP的总线功能模型命令进行解释,实现测试用例的可重用。通过设计AHB总线到EC总线的桥接,实现验证平台对AMBA总线系统与EC总线系统的兼容。该平台在基于COS操作系统的手机智能卡芯片验证中得以应用。     

实时仿真与嵌入式系统

Matlab和VxWorks是当今工业流行的仿真软件和嵌入式操作系统,二者之间的结合极大的方便了程序在嵌入式平台上的仿真.本文介绍了Matlab中RTW面向VxWorks实时目标的实现的方法和具体流程.     

多任务并行IEEE1394协议栈设计

为满足嵌入式系统对高可靠性和实时性的要求,利用IEEE1394总线标准的软硬件特性,设计多任务并行IEEE1394协议栈,通过设置不同任务优先级获得不同服务质量的数据传输,从而使IEEE1394子系统任务和命令的执行更具实时性。在VxWorks平台上实现的基于该协议栈的数字视频解码与SBP2移动存储验证了该设计的可行性。     

VxWorks嵌入式系统在CCU中应用

概述了列车通信控制单元CCU,给出了VxWorks嵌入式操作系统应用于CCU的软件流程设计,并最终实现了VxWorks在CCU中应用.     

基于MPC8270的VxWorks BSP的移植

针对嵌入式实时操作系统的要求,文中详细分析了在整个系统结构层次中VxWorks所处的位置和所起承上启下的作用,具体介绍了VxWorks的主要功能,并深入阐述了VxWorks的启动过程。同时,对于不同的目标硬件平台,VxWorks需要不同的板级支持包BSP来实现对其的板级接口,从而实现平台的可移植性;进一步地,详细说明了作为实现操作系统VxWorks硬件平台独立性的设备接口的板级支持包BSP的具体功能与结构,这样,程序开发者可以在完全不熟悉目标平台具体硬件的情况下,只在BSP中相应位置添加配置参数就可以完成底层硬件配置工作,最后讲述了BSP的主流设计方法。     

VxWorks在高速数字电台互联网中的应用

VxWorks是一种高性能的嵌入式实时操作系统.在高速数字电台组网的研究开发过程中,我们利用VxWorks操作系统提供的网络功能实现IP层以上的功能,充分发挥了VxWorks网络功能强大和实时、多任务的特点,简化了系统的开发过程.本文主要介绍VxWorks的特点和该系统在数字电台互联网络中的应用.     

基于VxWorks多任务的无线接收机系统设计与实现

介绍了嵌入式实时操作系统VxWorks及其多任务机制,将新旧两代无线接收机进行比较,根据新一代无线接收机的多任务并行运行要求和实时性要求,提出了利用VxWorks的多任务机制实现无线接收机的任务调度与通信机制的方法,设计与实现了新一代无线接收系统.     

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.