USB接口的数字摄象系统

讨论了具有USB（通用串抒总线）接口的数字摄象系统的实现，该系统基于IN－TEL司的80X930系列USB总线控制器，符合USB协议（版本1），是一种新型的计算机多媒体设备。     

USB的系统组成

USB是Universal Serial Bus的简称。它是一种可以同时处理计算机与具有USB接口的多种外设之间通信的电缆总线,USB已成为目前PC标准的通用串行总线。一个基于计算机的USB系统可以在系统层次上被分为三个部分:即USB宿主(host)、USB设备(device)、USB连接(主要于USB2.0中涉及)。本文将分别对其进行叙述。     

向前 向前 向前 前置USB安装指南

现在USB（Universal Serial Bus通用串行总线）设备是日益流行．从鼠标、键盘到打印机、摄像头．甚至是显示器．已经有更多的设备开始使用USB接口．可以说USB接口是现在利用率最高的计算机接口之一。因为USB设备不仅有着非常良好的兼容性更有易便携的特点．不仅可以即插即用，还能热插拔。所以日益受到人们的喜欢。     

基于μCOS-II的USB主机系统

USB（Universal Serial Bus）是目前应用非常广泛的一种总线形式。其即插即用、热插拔、接口体积小巧等优点给计算机外设连接技术带来重大变革。μLCOS-Ⅱ是一个源码公开、完整的、可移植、可固化、可裁剪的嵌入式实时操作系统,可以方便地移植到多种微处理器上。以在新太科技实际工作中的LPC2378读卡器为例,详细介绍μLCOS-Ⅱ中USB主机系统的设计。     

Alereon成为IOGEAR的Certified Wireless USB解决方案提供商

Alereon公司宣布其成为多合一计算机连接解决方案供应商IOGEAR的合作伙伴，为其提供符合USB实施者论坛（USB-IF）制定的Certified Wireless USB（认证无线USB）要求的无线USB技术。     

USB音频设备类的自适应软件锁相环设计

USB（Universal Serial Bus,通用串行总线）是近年来得到大力发展和应用的计算机接口技术,它简化了计算机外部接口连接过程,便于计算机扩展各种外部设备。USB在协议制定时,为了方便不同方向的设计者进行开发,定义了不同的USB设备类（USB Device Class）。本文针对使用USB_Audio_Class进行语音设备设计时需要解决的音频信号同步问题进行了介绍,并给出了相应的解决方法和部分源代码。     

USB系统结构与应用设计

通用串行总线（USB）是一种简单的计算机外围接口标准,它具有即插即用、扩展方便等优点,已成为计算机必备的一个接口。本简要介绍USB总线的功能、拓朴结构及其数据传输过程,并举例说明USB接口的实际应用。     

硬件:USB安装指南

USB（ Universal Serial Bus）接口以能方便地增加外设而无需占用计算机的串并口而著称——理论上是“即插即用”。虽然 USB堪称是目前连接计算机外设的最佳接口，但它还不够完善，因此要是使用不当，您很容易误入歧途。 　　主板是否支持？ 　　一些老式的主板和机箱虽然看上去有 USB接口，但并没有被激活。所以请查看一下你的主板或计算机的用户手册，按照上面所说的方法打开 USB“开关”。对于一些老式的机器，可以通过查看 BIOS开机设置来确认 USB支持是否已经打开。 　　如果你的主板确实不支持 USB，那只好加一块带有 US…     

基于DSP的嵌入式USB从机接口设计

通用串行总线（usB）作为过去几年里计算机和嵌入式领域的热点,推动了计算机外设的飞速发展。介绍Pc机与数字信号处理器（DSP）通过USB接口实现高速通信的一种设计方案。给出了硬件和软件接口电路的设计实现,系统中选用Cypress公司的CY7C68001EZ—USBSX2,为DsP（TMs320Vc5416）构筑与PC机之间的高速双向传榆通路,开发小规模主从式系统。该应用系统可以满足高速信号处理的要求,并具有速度快和可靠性高等优点。     

利用USB接口的原始视频实时采集系统

本文设计了一种利用USB接口采集原始视频动态图像的系统的设计方法.这个系统采集的是未压缩的原始视频动态图像,可以把来自摄像机或电视的模拟信号转换成数字化的视频数据,再经USB接口送入计算机中.与常见的图像压缩采集卡相比,这个系统具有信息延迟小、图像清晰度高、安装使用方便的优点.系统硬件电路采用了方便的USB接口,一台计算机可以同时采集多路视频,方便后期进行图形分析、识别或比对处理.     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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