TMS320C32扩展异步串口的方法

介绍了实现异步串行通信接口的三种方法:软件模拟实现、硬件实现、专用协议芯片实现。给出了具体实现的硬件接口和软件编程。在接口的第二种和第三种实现方法中,都使用了FPGA实现逻辑接口。     

基于TMS320VC33扩展异步串口的一种方法

介绍了TMS3 2 0VC3 3DSP实现异步串行通信接口的三种方法 :软件模拟实现、硬件实现、专用协议芯片实现。给出了具体实现的硬件接口和软件编程。在接口的第二种和第三种实现方法中 ,都使用了FPGA实现逻辑接口。     

应用NAT9914实现GPIB接口讲者器件的方法

介绍了一种利用能与微处理器直接相连的专用接口芯片NAT9914构成GPIB接口的硬件电路 ,同时给出了为实现GPIB接口而对其进行初始化的程序流程图及程序 ,最后介绍了实现讲功能的软件编程。     

SIPG网关E1接口板卡及其驱动的设计与实现

SIPG网关是实现VoIP网络与传统PSTN网络互连互通的SIP/PSTN网关.目前有很多SIP/PSTN语音网关产品,但其硬件主要由DSP来实现,而本文的SIPG网关E1接口板卡简化了硬件设计,没有DSP(是由软件来实现),驱动程序完成对硬件的配置以及对上层网关软件提供接口,这样的设计节约了硬件成本,能够很好地满足许多企业的需求.     

基于单芯片嵌入式以太网接口的实现

本文提出了一种基于单芯片嵌入式以太网接口的实现,解决了嵌入式设备实现网络通信的问题;采用Freescale公司生产的MC9S12NE64实现以太网硬件接口。并在其上实现简化的TCP／IP协议栈,方便嵌入式系统与计算机网络的通信。     

USB/EPP转接系统的硬件设计与实现

设计并实现了一个USB/EPP转接系统,给出其硬件设计方案并讨论了相关技术细节,使其实现USB接口到EPP接口的相互数据转发.使仅具有EPP接口的传统仪器设备借助于USB/EPP转接系统拥有USB总线所提供的即插即用和设备插架特性,方便其通过USB接口灵活接入同时拥有多个外设的计算机主机系统.     

基于ASIC的微机和RAM间脉冲驱动的接口设计

论述了利用Verilog HDL语言实现ISA端口操作和脉冲驱动RAM接口逻辑没计,并充分利用端口读操作脉冲的所有信息（前后沿和其低电平）实现了微机-端口-RAM的流水线式接口设汁,设计原理及其编程简洁,基于可编程逻辑器件FPGA的逻辑实现使外部硬件连接布线简单可靠;逻辑仿真结果符合硬件接口时序的要求,在线阵CCD数据采集系统中应用效果良好。     

应用NAT9914实现GPIB接口讲者器件的方法

本文介绍了一种利用能与微处理器直接相连的专用接口芯片ＮＡＴ９９１４构成ＧＰＩＢ接口的硬件电路,同时给出了为实现ＧＰＩＢ接口而对其进行初始化的程序流程图及程序,最后介绍了实现讲功能的软件编程。     

USB/EPP转接系统的硬件设计与实现

设计并实现了一个USB/EPP转接系统,给出其硬件设计方案并讨论了相关技术细节,使其实现USB接口到EPP接口的相互数据转发。使仅具有EPP接口的传统仪器设备借助于USB/EPP转接系统拥有USB总线所提供的即插即用和设备插架特性,方便其通过USB接口灵活接入同时拥有多个外设的计算机主机系统。     

一种新的高速ASI的设计与实现

介绍了一种新的高速ASI的设计与实现。该接口以CYPRESS公司的CY7B923和CY7B933的基础,辅之以EPLD和FIFO,实现了ASI的发送与接收功能。接口符合DVB－ASI接口规范,实现了高速270Mbit/s的Mpeg-2传输流传输。文中首先介绍了ASI的特点,构成：接着以本文实现的DVB－ASI为重点,详细阐述了它的硬件组成与硬件实现;最后给出了DVB－ASI接口的测试实验。本文设计的DVB－ASI接口经在多节目复用器,码流发生分析仪,高清编码器和解码器中的成功应用,证明了其设计的正确性与可靠性。     

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.     

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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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