煤气计算机集中监测系统

煤气计算机集中监测系统对于合理分配煤气、节约能源具有重要意义。本文从系统方案、硬件实现和软件组成几方面对系统做了介绍。     

成都市煤气SCADA系统设计方案

本文介绍了成都市煤气SCADA系统设计方案。根据成都市煤气供气系统的特点和成都市煤气总公司提出的关于煤气管网监测、控制和生产调度方面的技术要求，设计了成都市煤气SCADA系统。对系统构成、软硬件配置及各部分的功能进行了描述，介绍了SCADA系统在煤气行业的应用。     

微机监控技术在煤气输配系统中的应用

本文结合煤气输领域的行业特点，阐述了其计算机监控系统的设计原则，详细介绍了煤气监控调度系统的总体构成和主要功能，并对煤气监控领域的未来发展提出了自己的看法。     

钢铁企业煤气调度系统建模及优化研究

钢铁企业煤气系统的煤气生产量与消耗量的动态平衡状态,对于降低生产成本、实现节能减排具有重要意义.针对钢铁企业煤气调度中存在的问题,以最大经济效益为目标,建立了煤气系统的通用调度模型.在此基础上,结合分级调度的思想,通过采用单纯形优化方法,给出一种相对优化的调度策略,并说明了其实现步骤.最后结合具体案例,对提出的算法进行分析,验证了调度方法的有效性.     

微机监控技术在煤气输配系统中的应用

本文结合煤气输配领域的行业特点，阐述了其计算机监控系统的设计原则，详细介绍了煤气监控调度系统的总体构成和主要功能，并对煤气监控领域的未来发展提出了自己的看法。     

铁矿石熔化特性测控系统研制

本文介绍铁矿石熔化特性测控系统设计、组成环节、功能及应用效果。该系统基于PC机及接口．通过VB编程实现电炉控温，滴落摄像，软熔带压力损失及料层收缩率测量，熔融滴落计数系统，煤气成分远传通讯系统，数据、曲线存储及实验报告打印输出的全部自动化。系统工作稳定，操作界面良好。     

连续加热炉炉温自校正控制的实现

本文基于煤气流量与检测点处炉温间的多变量动态系统模型的在线辨识,对具有跟踪调 节炉温作用的煤气流量设计了最小方差自校正控制器,随时确定相应的最佳煤气流量,实现了 炉温的最优控制.仿真研究表明,本文方法能够满足控制要求.     

基于CC2420的无线自动抄表系统

分析了现有煤气抄表技术存在的问题,提出了一种基于CC2420芯片的无线自动抄表系统,该系统采用了一种新型的低功耗、低数据率、低复杂度、高可靠性的通信技术.文中详细介绍了其电路结构、通信机制及软件实现流程,该系统有效解决了煤气抄表中存在的入户难,效率低,维护难,成本高等问题.     

基于PLC的煤气计量系统

本文介绍一种基于PLC的煤气计量系统。以昆明市煤气计量站的煤气计量系统为例,阐述了该系统的体系结构。该系统采用主、备份机同时运行的方式,保证数据采集的不间断。系统实际运行稳定、数据采集准确。     

煤气平衡认证分析系统的设计

针对流程工业中煤气的供耗平衡问题，本文以某钢铁企业为背景设计一个煤气平衡认证分析系统，系统由消耗预测、平衡认证、虚拟仪表、Web发布等模块组成，具有用户煤气消耗预测、煤气计量自动平衡、仪表远程校准、煤气数据Web发布等功能。系统的运行减少了煤气计量系统的误差，自动平衡认证了煤气的发生量与消耗量，对于企业的节能降耗具有重要意义。     

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.