以太网单片机的酒店客房网络集中控制方案

基于HTTP超文本传输协议,通过浏览器网页集客房信息监测、灯光控制、空调控制、门禁控制、供电管理功能于一体.基于以太网单片机CH563设计的客房控制器RCU,通过以太网连接到Web服务器,可以控制客房内设备的开关与运转,同时收集客房信息上传服务器;基于CH563设计的Web Server,可以代替传统的电脑服务器,体积小、成本低;酒店管理员可以通过浏览器访问CH563,在网页上获取客房信息、下发控制命令,实现智能集中管理.     

基于CH395的跨平台远程文件管理系统

基于FTP应用协议,通过CH395实现跨平台远程文件管理系统。CH563作为主控制芯片,负责处理所有的事务;CH395作为以太网协议栈芯片,提供以太网数据传输通道。该系统硬件简单,遵循熟悉的文件操作方式,很好地实现了文件共享和数据管理。     

基于VS1053和ADXL345的MP3播放器设计

为实现音频文件的播放和摇动控制,设计并实现了基于VS1053和ADXL345的MP3播放器。硬件上以SD卡作为音频、字库文件存储介质,选用芬兰公司的VS1053搭建音频解码模块,IAP15F2K61S2单片机通过SPI总线发送音频数据到VS1053解码播放,采用ADXL345完成加速度的测量。软件上使用FatFs文件系统模块挂接SD卡,高效地管理SD卡上的数据。人机界面上采用条形菜单方式进行管理,方便系统功能扩展。经过测试该播放器的播放效果良好。     

LED大屏幕同步显示控制系统设计及实现

提出了一个基于DVI接口作为视频数据源、利用千兆以太网进行数据传输的全彩色LED大屏幕同步显示控制系统的设计方案.实现了该系统各硬件单元,包括核心处理嚣XC3S250E、DVI接口、USB接口、以太网接口和LED大屏幕驱动电路等.开发了LED大屏幕节目编辑和播放控制的系统软件,介绍了基于VS2005平台所设计的系统界面...     

工业以太网架构中交换技术的选择

简要介绍了工业以太网在实时性方面的主要解决方案,论述了不同的以太网交换技术对网络实时性能的影响,以及在工业以太网架构中的设计原则.     

DSP TMS320VC5402的以太网接口设计

本文介绍了以太网控制器RTL8019AS的主要性能特点,给出了利用RTL8019AS实现TMS320VC5402与以太网互连的接口电路及编程实例,接口方式为跳线模式.通过该接口可实现DSP与以太局域网间的互联.     

VLAN技术在三层交换机中的应用

主要分析了以太网中使用VLAN技术进行网段划分所带来的优势,以及VLAN子网之间通信的问题.详细介绍了VLAN技术,第三层交换技术和三层交换机的种类.最后,给出了VLAN技术在三层交换机中的应用.     

基于FPGA的网络延时模拟器设计

本文针对在实验室范围内进行网络测量的需要,设计了以FPGA为核心的网络延时模拟器.介绍了网络延时模拟器的硬件电路的设计以及FPGA内主要模块:以太网接口、SDRAM时分复用、延时控制器的设计.给出了一种对多路以太网数据分时进行处理的方法,实现的网络延时模拟器能够完成数据0～200ms的延时处理,在实验室中已经应用于TCP/IP网络的测量与评估研究.     

基于MC9S12NE64的远程故障诊断系统的设计

为了使远程设备正常运行,及时排除运行故障,设计了一种以嵌入式以太网芯片为核心的远程故障诊断系统.简要介绍了以太网芯片MC9S12NE64的主要特点、内部结构和运行模式,给出了远程故障诊断系统的硬件组成以及软件支持.     

基于MPC563的ECU嵌入式系统设计与应用

电子技术尤其是微处理器在汽车上的广泛应用，使得汽车电子化越来越高，已经成为现代汽车发展的主要趋势、摩托罗拉带有PowerPC架构的高性能32位嵌入式微处理器，已在汽车电子领域得到了广泛应用。本论介绍了基于PowerPc内核的嵌入式芯片MPC563主要功能模块，并给出了一种基于MPC563的ECU嵌入式系统设计实现方案。     

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.     

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.     

法律信息库系统

本文分析了法律数据库的结构和特点，介绍了采用面向对象设计方法和超文本数据库技术开发和实现法律信息库系统将作为重要网络资源之一为不同用户进行法律咨询服务。     

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.     

International Journal of Automation and Computing Table of Contents

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Information for authors

正SCIENCE CHINA Information Sciences(Sci China Inf Sci),cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China,and published by Science China Press,is committed to publishing highquality,original results of both basic and applied research in all areas of information sciences,including computer science and technology;systems science,control science and engineering(published in Issues with odd numbers);information and communication engineering;electronic science and technology(published in Issues with even numbers).Sci China Inf Sci is published monthly in both print and electronic forms.It is indexed by Academic OneFile,Astrophysics Data System(ADS),CSA,Cabells,Current Contents/Engineering,Computing and Technology,DBLP,Digital Mathematics Registry,Earthquake Engineering Abstracts,Engineering Index,Engineered Materials Abstracts,Gale,Google,INSPEC,Journal Citation Reports/Science Edition,Mathematical Reviews,OCLC,ProQuest,SCOPUS,Science Citation Index Expanded,Summon by Serial Solutions,VINITI,Zentralblatt MATH.     

Erratum to: Fast global kernel fuzzy c-means clustering algorithm for consonant/vowel segmentation of speech signal

正Erratum to:J Zhejiang Univ-Sci C(ComputElectron)2014 15(7):551-563doi:10.1631/jzus.C1300320The original version of this article unfortunately contained mistakes.Algorithm 6 should be as follows:Algorithm 6 FGKFCM-F clustering Input:(1)X={x_1,x_2,…,x_N},,x_iR~d,i=1,2,…,N,the dataset;(2)C,1C≤N,the number of clusters;(3)ε0,the stopping criterion;     

Journal of Zhejiang University-SCIENCE C (Computers & Electronics) Total contents

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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.