基于双口RAM的ARM与DSP通信接口设计

提出了一种基于双口RAM的ARM与DSP通信接口的设计方案。该接口以ARM为主处理器、DSP为协处理器,ARM通过在Linux系统上建立的DSP任务管理线程实现DSP任务的管理和调度工作,DSP完成ARM下发的数据计算和处理工作,两者通过双口RAM交换数据。实际应用表明,该接口充分利用了两个处理器的功能特性,数据传输速度快,适用于ARM与DSP间需要进行大量数据交换的场合。     

基于可重构技术的DSP任务动态加载方法研究

针对国产异构多核微系统中DSP处理器任务的调度和启动的需求,基于可重构技术,提出了一种DSP任务动态加载方法。利用DSP处理器的HPI接口作为程序注入接口,在FPGA芯片中构建了具有总线隔离机制的配置通路,在SPARC V8处理器中以软件驱动的形式,实现了DSP任务动态加载。测试结果表明,所提出的DSP任务动态加载方法用时135 ms即可完成280 KB大小的程序注入及DSP处理器的任务加载,满足微系统的实时性需求。     

基于DSP+ARM架构的协议转换器设计

介绍基于DSP+ARM架构协议转换器的系统组成及其工作原理,给出了DSP通过EMIF接口与FPGA无缝连接的接口实现,DSP通过HPI接口与ARM高速接口的实现,以及基于ARM的高速以太网接口。简要介绍了基于嵌入式操作系统μClinux的网络编程,给出了实验结果。     

基于DSP和ARM的自适应振动信号采集系统

本文提出并设计了一种能够实现增益自适应功能的振动信号采集系统,该系统采用数字信号处理器（DSP）及嵌入式处理器（ARM）。该系统特点是能够根据被测信号的幅值变化自动调节放大器的增益,因而使得系统具有较广泛的适应性。同时利用SPI接口进行DSP与ARM之间的通信和数据传输,实现了高动态范围振动信号的高速采集。     

OMAPL138双核系统的调试方案设计

OMAPL138高性能、低功耗双核处理器为手持式移动设备提供强有力的支持。对双核通信模块DSPLink的软件架构和在Linux嵌入式操作系统下的编译加载进行了分析和介绍,以消息队列组件为例分析了ARM和DSP双核通信时通道的建立和连接的方式。通过DSP／BIOS和Linux端DSPLink的MSGQ接口和多线程技术,建立ARM和DSP消息传递通道,提供了在双核开发中对DSP端暗箱调试的解决方法。     

馈线保护中双口RAM的DSP与ARM9双CPU系统接口电路设计

介绍了DSP和ARM9双CPU经双口RAM的接口电路设计。在馈线保护中,采用DSP＋ARM9的双CPU结构,两者之间采用双口RAM进行数据交换。考虑到馈线保护的实时性和可靠性,对双口RAM选用了中断仲裁方式。设计了双口RAM、DSP和ARM9三者之间的硬件接口电路,同时还对三者地址值的分配关系进行了阐述。该接口的设计为牵引变电所馈线保护系统的需求打下了一定基础。     

基于TMS320VC5402 DSP的HPI方式自举的设计与实现

在DSP系统中,程序加载是其关键技术之一。TMS320C54xx DSP支持多种自举方式,在深入分析各种加载方法之后,选择了利用单片机来实现DSP的主机接口自举加载方式。结合单片机和DSP芯片的特点,设计了单片机和DSP主机接口的连接电路,编写了其运行程序,实现了DSP的主机接口方式自举加载。实验结果表明,该方法可以降低系统的复杂度和成本,提高系统的通用性,有很大的实用价值。     

视频监控系统中ARM与DSP的HPI接口设计

本文介绍了ARM S3C44BOX与DSP TMS320DM642的主要特点以及HPI接口的原理,提出了一个采用HPI设计ARM与DSP通信接口的方案.该方案应用在基于ARM与DSP的嵌入式视频监控系统的设计上,在两者之间建起一个高速数据通道,进一步提高了视频监控设备的性能.     

基于SPI总线的ARM与DSP通信协议设计

设计了一种基于串行外设接口(SPI)的通信协议以解决ARM和DSP之间大量数据传输问题。给出SPI接口设计和驱动设计方案,重点研究ARM和DSP之间通信协议。定义数据格式并引入校验机制保证数据传输的正确性,通过设计收/发机制和应答机制,实现数据的高效传输。实验结果表明,该方案能够实现ARM和DSP之间大量数据的实时可靠传输,满足控制系统对通信的要求。     

基于DSP系统的开放性设计

就如何增强基于DSP系统的开放性设计提出了两种方法(1)主机可通过DSP对FPGA动态配置,实现硬件功能的更改;(2)主机通过PCI接口对DSP软件的动态加载,实现软件功能的升级和扩充.     

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.