嵌入式网络终端的语音传输系统设计

根据嵌入式网络终端的特点及VOIP技术原理,设计了一款基于WinCE的嵌入式语音传输系统。此系统实现了嵌入式网络终端之间的语音通信,以及网络终端和PC机之间的语音通信功能,具有较强的可扩展性。     

热定型机尾气余热回收效率监测系统

目前纺织印染企业热定型机的能耗大,能源利用率低。为了节能降耗,采用了热定型机尾气余热回收装置,设计了一个针对该装置的热能回收效率监测系统。系统包括采集模块和监控中心。采用CAN总线构建网络进行通信。利用嵌入式实时操作系统μC/OS-II进行任务管理和中断响应。用户界面使用嵌入式图形系统UCGUI进行设计,通过高性能的电阻式触摸屏实现用户交互。经过实验测试和现场运行证明,系统具有实时性强、网络响应快、受环境影响小等优点。     

基于LonWorks的嵌入式网络监控系统的设计

设计了一种基于LonWorks总线和嵌入式系统的监控通信网络。系统采用MSP430单片机作为任务调度和嵌入式系统移植的主处理器,提高了系统运行的实时性和稳定性。DDE服务器实现了数据访问与交换等网络通信功能。总线技术与Web网络相结合,使用户能够通过信息网络监控界面方便地了解现场情况,更便于实现远程监控、诊断和维护功能。     

基于嵌入式技术的工业通信管理机的开发及应用

本文主要对嵌入式技术系统、嵌入式工业通信管理机的开发及其应用进行研究,重点分析了嵌入式工业通信管理机的设计构想、应用功能开发,并结合实际工程应用情况,对未来工业通信管理机的发展进行展望,以供参考。     

基于LPC2210微处理器嵌入式网络通信系统终端设计与实现

伴随信息通讯技术、网络技术、电子技术的飞速发展,嵌入式系统终端也开始受到关注,寻求具有网络通讯的功能;文章所研究的嵌入式系统的网络通信采用ARM作为嵌入式开发平台,系统采用SmartARM2200开发板,使用支持仿真和嵌入式跟踪的LPC2210微处理器;结合网络通信系统,最终选择具有TCP/IP协议的嵌入式uCLinux操作系统,构建系统文件,完成嵌入式TCP/IP设计;并利用socket函数实现数据的接受、发送和校验等,实现服务器端和客户端的通信;最后在ARM7平台SmartARM上运行带有Linux内核的uClinux操作系统上进行试验,实验证明了所设计的通信系统数据传输的实现及可靠性。     

基于嵌入式网络的数据采集与分布式计算系统

采用将网络的开放分布和DSP高速信号处理的优势相融合的技术,给出了系统详细的软硬件设计和工作原理,以及通过嵌入式网络接口与上位机通信和采用XML-Socket技术数据传输的设计和实现过程.实验验证了系统在工业环境中与多种传感器配合使用实现分布式数据采集与实时计算功能的可靠性、稳定性.     

基于网络环境的嵌入式PLC软件平台设计与实现

该文介绍了一种嵌入式系统新的设计方法:嵌入式PLC,详细介绍了嵌入式PLC的原理、功能,嵌入式PLC软件平台的硬件设计、内核设计、关键技术及特点,在此基础上,还介绍了利用嵌入式PLC构成通信网络的方法及实现。实际应用表明:利用嵌入式PLC开发嵌入式系统,容易实现网络的互连、信息集成和功能扩展,提高了系统开发效率,缩短了开发周期。     

基于嵌入式DSP以太网接口的设计与实现

本文以数字信号处理器和网络控制器为核心,设计了嵌入式DSP系统接入以太网硬件平台,并简化网络层次体系结构.完成相应的网络应用软件的设计,实现了嵌入式系统通过以太网与计算机进行通信功能.     

基于ARM构架的工业注塑机控制器设计

为把嵌入式技术应用到工业控制器设计领域上来,分别以S3C2440和S3C4480为上、下位机硬件核心芯片,Linux和μC/OS-Ⅱ为上、下位机软件平台来构建控制系统.针对控制器在工程实际中的需要,上位机配置了显示、控制、通信、报警等功能模块,下位机配置了通信、A/D转换、D/A转换、CAN总线等模块,同时分析了系统的运行流程,采用多线程技术对系统功能加以实现.对系统的实际测试结果表明系统完全可以满足设计要求,并具有良好的扩展性和二次开发可行性.系统以工业注塑机为背景,实现了嵌入式技术和工业控制技术的结合.     

基于FPGA的嵌入式ZigBee网关的设计与实现

为了更好地实现物联网或工业控制领域中传感器网络设备的远程监控功能,本文设计了一种基于FPGA的嵌入式网关系统的随机方法。该设计通过构建可编程片上系统(SOPC),并利用NiosII嵌入式系统通过串口通信来实现对多个ZigBee网络的数据采集,同时结合以太网通信实现数据传输和上位机实时监控功能。整个系统在DE2-115开发板[1]上实现并通过验证,实验结果满足设计要求,并具有较好的灵活性、可配置性和应用前景。     

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