基于OMAP的嵌入式TCP/IP开发

介绍了嵌入式系统TCP/IP的网络层及运动层C代码的开发过程,结合以太网控制器LAN91C96实现其链路层,将通用的上层程序移植到OMAP平台上,实现了OMAP平台的底层TCP/IP协议。     

OMAP5912软件开发平台的建立

移动通信的发展对处理器提出了越来越高的要求,既要满足高性能又要保持低功耗,传统的嵌入式单核处理模式已经难以满足。OMAP是TI推出的新一代高性能多媒体处理芯片,采用非对称双核处理器结构,使系统在保持良好人机交互环境的基础上,能有效地降低功耗。以OMAP5912平台为例,在对多个Linux版本进行试验的基础上,介绍了整个软件开发环境的建立方法和过程,进行了Linux2．6内核向OMAP平台的移植,最后对系统进行了验证和测试。     

MPEG-4视频解码模块的设计与优化

基于OMAP5910双核处理器设计了一个MPEG-4视频解码模块,对其进行了优化,使之具有实时解码处理的能力。介绍了MPEG-4简单框架的解码过程以及在DSP平台上代码优化过程的重点部分。算法的编写符合TI XDIAS算法标准,通用于C5000系列的DSP平台。该解码过程与优化方法对视频处理以及在OMAP平台开发其他应用有借鉴价值。     

基于嵌入式系统的预测控制的设计与实现

针对过程工业中中小型快速系统的过程控制问题,以ARM与浮点DSP双核控制器OMAP—L137为核心,通过硬件系统和软件系统配合,设计并实现了面向先进控制的嵌入式通用平台。以实时性为目标,将预测控制算法分块,分别对预测模型、约束处理和在线求解算法各块进行研究。提出了针对嵌入式计算速度和存储量有限等问题的解决方案,并将改进后的算法在嵌入式平台中实现。通过对相关模型的测试,结果表明:系统具有高速、高控制精度等优良性能。     

双核通信软件在OMAP5912上的应用研究

基于OMAP5912平台的嵌入式系统处理各种复杂的应用时,需要在双核之间传送大量数据并实现ARM对DSP的灵活控制.为了解决上述问题,研究了双核通信软件DSP Gateway.在基于OMAP5912平台的准在线故障诊断系统上应用DSPGateway软件,开发双核通信应用程序,通过全局共享内存完成采集的数据和处理后数据的快速传送,同时,ARM端用户程序使用系统调用控制DSP任务.双核实现了高效协调运行,提高了准在线故障诊断系统的实时性,且降低了功耗.     

基于OMAP5912平台的自适应双门限语音端点检测

目前语音识别技术已被广泛应用于嵌入式手持设备当中,而端点检测作为语音识别系统的前端处理模块发挥着重要的作用。传统端点检测的方法是基于固定门限阈值,所以不能够随时根据语音环境的变化,准确检测出端点的实际位置。利用短时平均上升过零间隔和短时平均幅度差作为门限参数,采用自适应更新门限阈值的方法,获得了优于固定门限阈值的检测结果。同时叙述了利用TI推出的OMAP5912嵌入式多媒体应用平台实现算法开发的过程。     

VxWorks操作系统在OMAP平台上的移植

VxWorks操作系统是美国风河(WindRiver)公司的一款嵌入式实时操作系统(RTOS),被广泛应用于通信、军事、航空航天等实时性要求极高的领域中;而OMAP处理器则兼容DSP内核和ARM处理器,具有广泛的应用领域.本文基于OMAP5910处理器架构和VxWorks操作系统的体系结构,将VxWorks移植到OMAP平台上.即根据OMAP5910的存储器地址空间映射关系和硬件资源配置,修改VxWorks操作系统的BSP相关文件,包括系统异常处理、CPU初始化、串口驱动和网络驱动的修改并加载等,并编译成内核镜像,将其移植到OMAP5910的ARM端.最后通过相应的测试点检测移植结果.     

基于OMAP的手持设备嵌入式系统研究

嵌入式系统是将先进的计算机技术,半导体技术以及电子技术和各行业的具体应用相结合的产物,便携式仪器具有高集成度、低功耗以及使用灵活的特点.因此适合于战场设备检测和机动性强的场合,对OMAP平台构架进行研究,同时结合便携式仪器设计构建了OMPA平台,在OMAP基础硬件平台上移植Linux操作系统.该系统是融合计算、通讯、存储等多种功能,搭建一套适用性较强的开放式多媒体应用平台,并设计了人机交互的图形界面,实现了实时图形操作界面,解决了关键的采集、处理、显示、键盘管理等技术问题.     

QNX下嵌入式视频监控系统研究

根据视频监控的特点,设计了一种强实时的嵌入式视频监控系统。系统基于QNX(Quick UNIX)嵌入式实时操作系统,采用异构双核处理器芯片OMAP3530为核心的开发平台,实现了视频的编解码和传输过程。     

基于OMAP的便携式数字遥测接收机实现

本文介绍了基于OMAP平台便携式数字化遥测接收机的实现,包括Boot Loader的实现、嵌入式Linux内核移植、文件系统的实现以及双核通讯程序的实现.     

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.