USB Host的应用研究

文章采用以U盘为USB设备和AT89C55单片机作为嵌入式系统的核心MCU,采用中断任务调度机制设计软件系统,设计并实现了基于USB Host接口芯片SL811HS建立了可与U盘进行通信的通用USB Host嵌入式系统模块。该模块能脱离PC,直接与传统的USB外设进行通信。将USB Host应用在HPDesk系列打印机中,实现USB主机系统的构建,并对开发嵌入式USB主机,使USB应用脱离PC具有普遍意义。     

USB海量存储设备身份认证方法的实现

在政府和企业信息网中,对人员进行身份认证和控制USB海量存储设备接入是防止信息泄露所采取的有效安全措施。分析了USB海量存储设备的描述符,提出了USB海量存储设备身份字的概念,对USB海量存储设备采用设备身份字认证,实现了控制USB海量存储设备接入主机的方法。     

Linux下MPC8272的USB主控制器驱动设计与实现

从介绍USB协议标准以及USB主机端的系统结构入手,分析了在Linux操作系统下,USB设备主控制器和USB设备的驱动结构,并介绍了Motorola MPC8272处理器中USB主控制器功能及其特点,以此为基础设计和实现了USB主控制器驱动的功能模块,并在Linux操作系统下进行驱动开发以及进行测试验证.给出了一种在嵌入式系统中USB主机控制器驱动的实现方案,为同类的嵌入式USB主机控制器开发提供了借鉴.     

基于Android的虚拟桌面USB设备重映像系统的设计

虚拟桌面是基于服务器的计算模型,可提高计算机的资源管理效率。现有的虚拟桌面对USB设备支持不足,无法实现USB设备的桌面虚拟化。针对这一问题,在基于Android的虚拟桌面上设计USB设备重映像系统,实现通过虚拟桌面对USB设备的操控。该系统通过NDK构建USB设备监听模块和控制模块,利用Socket在进程间传递USB设备信息,利用基于TCP/IP协议的消息框架与服务器进行数据传输。实验结果表明,在Android虚拟桌面上对重映像的USB设备进行读写操作,其传输速率与本地USB的传输速率相当。     

应用LabWindows/CVI实现USB操纵杆的仿真

针对工程实践的需要,对基于USB接口的操纵杆仿真进行了研究。通过比较在LabWindows／CVI环境中对USB设备数据操作的方法,基于USB操纵杆的特殊性,采用WindowsSDK、DirectX与CVI相结合的方法,实现了在Labwindows／cVI环境中对USB操纵杆数据的通信。多次试验结果表明,应用LabWindows／CVI对USB操纵杆进行仿真的逼真度及交互性都比较合适,同时验证了采用LabWindows／CVI实现USB操纵杆仿真的正确性及可行性。     

嵌入式VxWorks下基于PCI总线的USB接口主机端设计

分析了USB主机端的层次结构,采用PowerPC8270处理器设计了一种基于PCI总线的USB主机端设备,简化了主处理器与USB控制器的交互。在VxWorks操作系统下进行了USB主机端驱动的设计和实现,并通过试验对USB主机端的功能和读写速率性能参数进行了测试验证。测试表明,能够稳定地支持对USB接口存储外设的读写访问。     

OpenHCI for USB浅析

在嵌入式操作系统上实现USB Host可以使数码相机、新型手机和PDA脱离开PC直接与打印机和扫描仪等设备实现互连。如果能将USB Host内置于数码相机中,就能够将数码相机中的照片直接输出给USB打印机。本文对USB Host系统软件的协议框架OpenHCI进行了简单剖析。     

基于VB的USB设备检测通信研究

通过分析USB(UniversalSerialBus)的特点及内部结构 ,研究在Windows环境下用VisualBasic实现对USB设备检测通信方法。在Windows接口通信和USB设备驱动的基础上 ,使用WindowsAPI函数实现了对USB设备的检测和通信。     

SEP6200平台上Linux内核的USB OTG驱动设计

为了满足两个USB设备之间直接进行数据通信的需求,通过对现有USB OTG协议和相关应用的研究,在国产SoC芯片SEP6200平台上设计并实现了基于Linux内核的USB OTG模块驱动。首先介绍了OTG标准中的对话请求协议(SRP)和主机交换协议(HNP),然后制定并设计了基于USB控制芯片USB3343的硬件模块方案,最后根据Linux内核中已有的USB驱动架构完成了USB OTG设备驱动的设计,并最终实现了SEP6200嵌入式平台USB Host和De-vice角色的自由转换功能。     

基于Windows CE的USB摄像头驱动研究与设计

介绍在WindowsCE4．2嵌入式操作系统下进行USB摄像头驱动程序设计,通过分析USB设备总线、USB设备在WinCE平台上的驱动模型以及流驱动接口,以一款中芯微USB摄像头为例,详细介绍USB摄像头驱动开发过程,成功实现USB摄像头数据流采集、JPEG图像解码和位图显示。此方法对其他USB设备驱动开发具有参考意义。     

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.