核电厂核岛直流和UPS系统

采用美国西屋AP1000非能动技术路线的核电厂,核岛直流和UPS系统包括IDS系统和EDS系统,IDS系统是全厂唯一的1E级电源,为1E级负荷提供可靠的直流和不停电电源。EDS为重要的非1E级仪表、控制系统以及电动阀、电磁阀提供连续可靠的电源。本文对核岛直流和UPS系统组成、系统功能、设计基准、设备布置进行了详细介绍,参考相关文件对系统负荷和设备参数进行了归纳、整理,并重点分析了1E级电源IDS系统安全可靠性。     

调度自动化系统不间断电源可靠性改进方案

介绍了梅州供电局调度自动化主站2台UPS并列冗余的供电方式和运行风险。在落实南网总调关于调度自动化系统双机全停反措过程中,梅州供电局充分利用应急中心的UPS作为反措整改的后备保护电源,确保自动化系统关键设备的运行在受保护的情况下,实现了UPS双机向分列运行的平稳过渡。就如何提高UPS电源供电可靠性和降低改造风险等方面进行研究,为相关单位提供了设计思路。     

公安110指挥平台UPS电源基础设施的设计与研究

随着公安指挥系统不断更新换代,公安指挥系统的运行保障工作是系统可靠运行的关键,UPS电源系统作为保障系统可靠运行的重要基础设施,其系统选型、供配电系统结构设计、应急处理、运行状态监控及预警等方面的能力都是考察UPS供电系统的"健壮性能"。本文以公安指挥系统建设中以UPS供电系统设计为基础,探讨了当前公安指挥系统基础设施中设备供电系统的应用研究和经验总结。     

基于嵌入式Linux的UPS监测软件系统设计

介绍了基于嵌入式Linux操作系统平台,针对OverTop型号的UPS电源,设计并实现通过RS232串口与UPS电源通信,对UPS电源具有遥信、遥测、遥控功能的监测软件系统。经测试该系统运行可靠,具有在电力系统中对UPS电源监测的实用价值。     

变电站单电源直流系统的不停电改造

分析单电源直流供电系统的工作原理和直流系统不停电改造的影响因素,利用大功率二极管的工作特性,设计出新的临时直流电源系统,以解决新、旧两套直流系统在负荷电源转接作业中与临时电源系统并列运行产生的环流问题,同时提出具体的改造方案和工作流程。     

煤矿井下UPS电源网络化电池管理系统设计

煤矿井下UPS电源是在煤矿发生突发事件断电情况下,井下监控和生命保障设备持续运行的最后保证。因此针对煤矿井下特殊工作环境及目前相关行业标准,设计一种适合煤矿井下大容量UPS锂电池电源需求的电源管理系统,实现对UPS电源单体电池电压、容量、均衡性等多种参数的实时监测与显示,并将每个单体UPS电源接入到CAN总线网络中,通过总线网络实现对整个井下UPS电源系统的智能管理控制和循环自检。     

Best Power UPS“赶场”

3月31日,美国Best Power公司推出了其UPS电源系列产品。BEST UPS电源系列从2KVA到2700KVA,均采用绝缘栅双极型晶体管(IGBT)技术,提高了机器的可靠性和逆变效率。 BEST UPS电源使用全数字控制的方式,通过机器内的CPU进行数字控制,可对多达100个UPS内部参数进行编程控制,智能显示面板可以方便地显示UPS工作状态,用户通过面板就可对UPS所有的运行参数进行在线修改和调整。 BEST UPS的实时监控功能可以对UPS电源系统的模拟量参数进行实时采样,并通过高速模拟转换技术来实现数字式监控。其自测试、自诊断功能可对UPS电源内部逻辑控制电路的运行状态进行实时检测和诊断,它可利用机内的微处理器同时对UPS电源的控制部件进行总数达140个以上的关键点进行自诊断监控。用户还可通过可编程软件按实际运行工作的需要,来重新设置UPS内     

小议UPS不间断电源的原理及维护保养

本文简要介绍了UPS不间断电源系统的工作原理、系统维护以及运行中应该注意的关键事项,从而有助于在工作中提升UPS不间断电源系统的使用寿命以及使其更具有可靠性的稳定。     

UPS集中监控系统的研发与应用

针对大型分布式工业控制系统中不间断电源(UPS)位置分散、无法集中管理等特点,采用串口服务器联网技术,构建了UPS集中监控网络。考虑到系统中存在不同品牌的UPS设备,协议各不相同,开发了基于C#的UPS集中监控系统。工程应用表明,系统实现了工业现场中多个UPS电源设备的监控,并提供了短信报警功能;同时,通过OPC技术实现了与组态软件的数据交互,以便操作人员及时掌握企业UPS电源运行信息。     

UPS电源故障分析及日常维护保养

UPS电源作为一种可靠地供电设备,在现代化医院、电力、IT等行业得到广泛地应用.本文分析了UPS电源常见故障及处理方法,阐述了UPS电源在日常运行中应该注意的一些维护保养细节,以期能够最大限度地正常发挥UPS电源的作用,减少对UPS电源的损害,延长UPS电源的使用寿命.     

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.     

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.     

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)

正~~