一种基于CAN总线的程序调试技术研究

基于TI公司的DSP TMS320F2812,采用CAN总线,研究了一种多DSP的在线调试技术。计算机终端通过CAN总线下载程序到特定目标机,目标机通过内嵌的Flash烧写程序实现程序和数据的修改。该技术在磁悬浮列车中得到了应用,大大节省了控制器拆卸安装工作量,减少了调试时间。     

基于FPGA的嵌入式Ethernet-CAN通信转换卡设计

为实现CAN总线与PC通信,便于CAN总线数据的远程监控,提出一种新的基于现场可编程门阵列（FPGA）的多路CAN总线转Ethernet接口方案,以嵌入FPGA的NiosⅡ作为主控制器,MCP2515为CAN总线控制器,88E1111为以太网PHY芯片。利用可编程片上系统（SOPC）技术搭建了系统的硬件模型,在NiosⅡ IDE软件开发环境中,完成CAN控制器、以太网初始化和Ethernet-CAN转换程序。以数控系统中交流伺服驱动器为应用背景,实验结果表明：该转换卡完全满足以太网和CAN总线通信要求,方便地将CAN总线数据接入工业以太网,用户通过网络可方便地实现对工业底层的监控。     

多核DSP的Nand Flash启动软硬件设计

多核处理器片内一般具有容量较大的动态RAM,其程序代码存储在片外Flash中,或者通过主机下载程序。多核DSP的启动和单核启动区别较大,本文以8核DSP芯片TMS320C6678为应用平台,介绍了多核DSP的启动方法。通过I2 C总线芯片存储一级启动程序,应用程序存储到容量较大的Nand Flash芯片,文中详细介绍了该启动方法的软硬件设计。     

在系统可编程下载器设计与实现

为解决工程生产中程序下载更新问题,研发了基于MC9S12系列单片机的程序下载装置.提出软硬件开发方案,设计下载器实物,并结合单片机内部机理与Flash编程机制,编写内嵌式监控程序.在其引导作用下,通过EEPROM中介,RS232或CAN通信手段,对普通模式及保护模式下的FLASH实现在系统编程,完成点对点或点对多点的程序下载更新与调试任务.     

基于CAN的数据无损代码更新方法设计与应用

为了提高车载设备在复杂工作环境下固件升级的稳定性及可靠性,深入分析并研究bootloader机制,以汽车无刷直流电机控制器为载体,提出了一种基于CAN总线通信方式的数据无损代码更新方法。将上位机解析后的用户应用程序以链表队列的方式存储并根据数据无损的BLC通信协议通过CAN总线发送给控制器,控制器结合数据无损的代码备份和Flash加密机制实现用户代码的更新和错误回退等功能。实验结果表明,本设计方法具有很强的容错能力,可实现20 Hz以下的数据无损代码更新,并为其他复杂工作环境下的产品提供了一种固件升级的新思路。     

ADI DSP Blackfin53X的一种在线升级设计

通过深入研究ADI Blackfin DSP加载过程，提出一种在线升级方案。通过编写的上层下载程序和DSP Loader程序，可在DSP启动、判断特定条件后，进入运行模式(启动应用程序)或下载模式。在下载模式下，DSP的Loader会接收待下载应用程序数据，将其下载到外部Flash指定的地址中，从而方便、快捷地实现程序升级。     

基于MC9S12系列单片机的程序下载器设计

为了解决工程生产中程序更新、升级的问题,使工程师更方便地使用单片机进行研究与开发,提出了程序下载器的开发方案。通过编写监控程序和上位机软件实现了程序下载器对单片机程序的升级与调试,并结合Flash的各种机制,对普通模式和保护模式下的Flash实现在系统编程。     

CAN总线在石油仪器组合导航系统中的应用

基于DSP + FPGA结构的石油仪器组合导航系统中CAN总线系统设计,为了使数据能够在整个CAN总线网络协调、有效、快速、稳定的传输,提出了一种使用FPGA作为CAN总线节点结构中的核心处理器的设计方法;CAN控制器采用具有SPI接口的MCP2515,利用FPGA实现MCP2515的初始化、数据的发送和接收,实现了DSP处理器的CAN总线扩展应用;该方法由于把CAN节点控制的大量的工作交给FPGA实现,DSP只需要对FPGA中CAN数据接收FIFO和CAN数据发送FIFO进行读写操作,即可完成CAN总线的数据读写操作,大大减轻了DSP的数据处理压力;试验测试及产品应用表明,该设计有效、稳定可靠、可扩展性好,易于修改和移植,具有较强的工程实用价值。     

基于DSP虹膜识别系统中Flash烧写方法的研究

为实现基于DSP的虹膜识别系统上电自启动的需求,需要将用户应用程序烧写入非易失性存储器中。分析了DSP系统片外Flash存储器的烧写原理,提出了一种利用存储器操作模块程序来进行Flash烧写的方法,阐述了DSP片外Flash烧写关键点以及如何确定烧写对象、源地址和目的地址,研究了在仿真环境下通过模块化程序操作DSP片外Flash存储器的过程。使用该方法完成虹膜识别系统片外Flash烧写,脱机后系统运行稳定。     

基于JTAG的可重构Flash快速编程方法

提出一种基于JTAG的可重构Flash快速编程方法及其硬件框架。将Flash编程控制流程序预先下载至片上SRAM,并由硬件自行识别和执行,而JTAG接口仅用于传输数据,有效消除JTAG总线传输瓶颈,提高Flash下载速度。通过向片上SRAM下载不同的Flash编程控制流程序,实现Flash下载控制流程的重构,可支持不同类型Flash的在线编程。该设计硬件资源开销小、灵活性强。实验结果表明,编程速度约为传统方法的17倍。     

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.