基于Simulink的PEM燃料电池模拟器

基于一种面向控制的质子交换膜燃料电池的模型,本文中设计并实现了一种新型的燃料电池模拟器软件,利用Mat-lab/Simulink 工具箱以及Madab的界面编程能力,将燃料电池系统模块化,在GUI界面上,用户可以根据需要组合各个子系统构建燃料电池系统,并能向模块库中添加用户的模块.     

振弦传感器在船舶应力监测系统中的应用

船舶在航行过程中受到多种力的作用,而目前船舶上几乎都没有结构安全监测系统,船员无法掌握其受力状态,不能及时了解各关键部位的应力情况。通过对振弦传感器特性及应用方法的研究,将振弦传感器应用于船舶结构安全监测系统,实现了船舶应力的长期、实时监测。     

基于信息技术的燃料电池电源变换技术研究

电源变换技术是DC/DC、DC/AC、AC/AC、AC/DC的总称。当前的DSP技术,广泛应用于DC/DCDC/AC变换模块,已经解决了很多原来不能解决的客观问题,产生了积极的效应。本文结合燃料电池课题,阐述了信息技术在电源变换技术中的应用,对基于DSP的船舶用双向DC/DC变换器进行了深入分析,为燃料电池技术应用于船舶用电力推进提供了理论依据。     

一种神经网络PID控制在燃料电池测试系统中的应用研究

对燃料电池测试系统中露点加湿器的温度控制进行研究,提出了一种用BP神经网络进行参数整定、积分分离的PID控制算法.利用神经网络的任意非线性表达能力,通过对系统的学习来调整PID参数,实现最优的PID控制.通过在实际燃料电池测试系统中的实验表明,这一算法实现的PID控制系统控制稳态好、过冲小、收敛快.     

基于LabVIEW的燃料电池监控系统

研制了一种9 kW PEMFC燃料电池监控系统,采用工控机和基于LabVIEW的软件平台,实现了燃料电池的氧气供应系统、氢气供应系统以及风冷系统的控制和监测,并以图形化的方式动态显示燃料电池系统的工作状态并进行报警处理.     

基于信息技术的燃料电池电源变换技术研究

电源变换技术是DC/DC、DC/AC、AC/AC、AC/DC的总称.当前的DSP技术,广泛应用于DC/DC DC/AC变换模块,已经解决了很多原来不能解决的客观问题,产生了积极的效应.本文结合燃料电池课题,阐述了信息技术在电源变换技术中的应用,对基于DSP的船舶用双向DC/DC变换器进行了深入分析,为燃料电池技术应用于船舶用电力推进提供了理论依据.     

一种用于改善燃料电池动态特性的模糊控制系统

燃料电池及其应用在汽车上的性能主要依赖于当前温度、湿度、纯度及流速等参数。重点研究流控制在单电池电极装配中的实现。提出一种基于递归最小方差辨识的算法来计算非线性参数,本文设计了一种基于模糊控制的系统来取代传统的流控制系统。     

不用艏侧推时船舶定点控位方法研究

本文提出了不用艏侧推的船舶定点控位控制方式。其特点是仿效人类航海技巧,充分利用海洋环境作用在船舶上的力来实现船舶的定点控位。仿真结果表明,在高海情下,此控制系统可以实现无艏侧推船舶定点控位,并且在设定点变化时,船舶具有较快的运动响应速度。     

燃料电池发动机控制器的以太网通信接口设计

燃料电池发动机控制器用于控制和优化燃料电池电堆发电的过程,改善整个电动汽车动力系统的性能;针对当前燃料电池发动机控制器数据传输速率低、无法联网升级的现象,提出基于主控制器芯片TMS320F2812和网络芯片ENC28J60的网络接口的硬件方案,给出了以太网接口的设计电路、网络协议栈的实现方法、程序流程以及部分源程序;实验结果表明,该通信接口具有实时性好、可靠性高等优点,实现了控制器的快速实时监测与远程控制升级。     

基于PLC模块的船舶监控仿真系统实现

以西门子S7-300系列PLC为核心模块设计船舶监控仿真系统,实现了PLC下位机程序设计,基于Prodave软件包和Profibus总线实现数据通信传输功能,实时采集船舶航行信息、设备运行信息等数据到PC上位机;在船舶综合信息平台网络和数据库系统的基础上,综合运用虚拟现实技术、计算机建模技术、故障诊断技术、信息集成、网络信息技术等技术手段开发了基于PLC模块的船舶监控仿真系统;该系统可以有效地降低船舶工作人员的劳动强度,提高其工作效率,还可以对船舶人员进行基础技能训练、船舶管理训练、故障诊断与排除训练等。     

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