基于CS5460A芯片的列车供电电能表设计

本文介绍了电能计量芯片CS5460A的功能和使用方法,给出了采用CS5460A芯片与微处理器连接设计列车供电电度表的方案,并进行了样机实验。实验结果验证了该设计的可行性和有效性。     

基于CS5460A的数字电能计量表的设计研究

在分析∑-△A/D转换器工作原理的基础上,设计了一款单相数字电能表。以AT89S52单片机为控制核心,采用带有串行接口的单相双向功率电能集成芯片CS5460A,能实现单相电量的检测、显示、存储和查询功能。实验结果表明,该电能表具有高灵敏度、准确、防窃电等优点,有很好的实用开发价值。     

基于CS5460A的高精度数据采集系统的设计

阐述了基于高精度串行A／D转换器CS5460A的数据采集系统的设计及实现方法。硬件方面,简单介绍了单片机与各芯片的接口设计及CS5460A与传感器的接口电路设计;软件方面,介绍了该系统的主程序流程图,并重点介绍了如何采用软件滤波的方法来提高系统的抗干扰能力。该系统中,单片机与上位机之间采用MODBUS协议进行通讯,并详细叙述了CRC冗余算法的实现问题。软件滤波和CRC的使用,使该系统精度得到了极大地提高,可靠性更强,适应了工程的需要。     

CS5460A在路灯单灯监控系统中的应用

为了更精确地对城市的路灯进行智能监控,采用CS5460A及MC13213组成单灯测控节点,将ZigBee技术应用到照明监控系统中去。详细论述了单灯测控系统的设计过程及CS5460A的编程配置。系统具有电路简单、体积小、功耗低、精度高、成本低等特点,具有较高的实用价值。     

自动抄表系统的设计

自动抄表系统以准确计量、抗干扰能力强、节省大量人力资源等优点得到了电力部门的普遍重视。但自动抄表系统目前还不是很成熟,市场上出现的产品还存在不少缺点。本文对自动抄表系统原理进行研究,深入介绍了电能采集、传输、接收及显示的过程,实现了无线抄表的目的。本文以凌阳单片机为控制核心,其具有功能强大、功耗低、运算速度快等优点,同时内部又具有32K的Flash,使系统结构紧凑、灵活。本文采用DS1302作为系统时钟芯片,为系统采集电能提供了准确的时间信息,另外,先进的电能采集芯片CS5460A,可以对电压、功率、电能等进行测量和计算。同时采用无线收发模块nRF2401A对数据进行无线收发,在微处理器的控制下对数据进行处理后向上级系统发送,实现了采集终端和控制终端之间的短距离无线通信。最后,终端电表数据存储在上位机数据库服务器,配有专门的系统软件,具有自动抄表,数据处理,信息分析及统计等功能。     

基于CS5460A的高精度数据采集处理系统

阐述了基于CIRRUS LOGIC公司电子式电能表芯片CS5460A的高精度、快速的数据采集处理系统。在介绍CS5460A的结构、特性、读写操作的基础上，重点讨论数据采集系统的精度和实时性等问题，提高了宽动态范围内小信号的分辨率，解决了传统数据采集系统中精度和实时性难以兼顾的问题。     

低成本高精度多功能计量终端设计

介绍了基于MSP430F449超低功耗MCU和CS5460专用电能计量芯片组进行设计的,具有低功耗、低成本、高精度特性的电能计量计费终端技术.阐述了系统的组成结构、功能实现及相关的软、硬件模块设计.     

电能计量芯片CS5460在MSP430中的应用

介绍一种基于TI公司的新型单片机MSP430设计的应用系统,利用MSP430超低功耗和高集成度的优点,通过与带有高速计算功能的串行接口的单相双向功率/电能计量集成电路芯片CS5460的连接实现功率测量,并给出读写C程序,最终实现了MSP430单片机与CS5460芯片的通信.     

Cirrus Logic电表IC为高性能家居和工业产品提供精量

Cirrus Logic公司推出CS5461A和CS5463两款高精度电表集成电路（IC），为数字电表制造商提供了适用于新一代电能测量应用产品的简易升级选择。这两款产品与Cirrus Logic公司的CS5460A产品引脚完全兼容，而且新增了诸如视在和无功功率等功能，可缩短开发时间，并降低新一代电表的材料成本。     

基于CS5460A的单相智能功率表的设计

介绍了一种基于CS5460A的单相智能功率表的设计。本设计以AVR单片机MEGA128为系统的控制核心,运用带SPI接口的功率计量芯片CS5460A,系统配置RS485接口,128×64点阵LCD、键盘输入、实时时钟、FLASH存储器等。该功率表要实现的主要功能是功率参数的实时测量,存储与显示,并能够实现与PC机的通信。     

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.