基于CORBA的B/S模式的实时信息发布技术

本文提出了一种基于COBB的B/S模式下的实时信息发布技术及实时信息发布系统的体系结构。该技术以CORBA提供的事件服务、ORB以及IIOP等来实现实时信息的网上传送,以CORBA提供的跨平台对象互操作能力和Browser的对象嵌入技术实现实时信息的一致性的表达。并描述了这个融合CORBA和Browser/Server模式优点的应用系统的体系结构。     

基于CORBA的B／S模式的实时信息分布技术

本文提出了一种基于CORBA的B／S模式下的实时信息发布技术及实时信息发布系统的体系结构。该技术以CORBA提供的事件,ORB以及IIOP等来实现实时信息的网上传送，以CORBA提供的跨平台对象互操作能力和Browser的对象嵌入技术实现实时信息的一致性的表达，并描述了这个融合CORBA和Browser/Server模式优点的应用系统的体系结构。     

应用HLA的多传感器信息融合仿真系统研究

分析信息融合中的通用处理模型-JDL修正模型,针对其一级融合,提出多传感器信息融合仿真验证系统应用模型,具体包括仿真剧情、传感器模拟、位置及属性融合、分析评估及可视化显示五部分;基于该应用模型,实现HLA联邦成员、对象类与交互类等HLA联邦设计,建立一套基于HLA的多传感器信息融合仿真验证平台;仿真实例说明了系统设计的有效性.     

空中交通管制指挥监测系统中的多雷达数据处理

针对基于信息集成的空中交通管制指挥监测系统（ATCCMS）的体系结构，本文根据一般多雷达处理的模型，按照系统的特定要求分析了模型中各个流程的算法，给出了ATCCMS中信息集成时多雷达数据融合的方法，从而为ATCCMS的上层应用提供实时准确的数据基础。     

面向仿真训练系统的过程模型研究

该文首先说明了过程模型的功能，根据功能需求对相关过程建模方法进行分析，找出了适合于仿真系统中过程模型的描述方法，并重点给出了一种基于有限状态机方法的训练过程模型框架、过程模型实时调度方法和应用实例。该过程模型框架由演示过程、物理行为过程、混合过程、过程转移、转移条件等对象类组成，在仿真训练系统开发中，通过定义和扩展这些对象类，对基于有限状态机的过程模型进行控制与调度，准确而全面地描述和管理仿真训练过程，从而有效地解决了仿真训练系统中的过程模型开发问题。     

传感器网络中协作任务的实时调度

在传感器网络实时监测应用中，大量传感器散布在监测区域中感知监测域的各种环境或监测对象的信息，一组功能有限的传感器往往相互协作地完成一个大的实时感知任务，协作性是传感器网络的重要特性，它要求实时任务之间的资源共享。单纯的实时系统为保证任务的实时性通常采用资源隔离机制而不能很好地解决传感器网络环境中的采集流数据处理的协作性问题。本文基于服务器的调度框架，使用了实时环境中的时间属性，将数据时间与程序时间相结合，从而将应用语义与系统中运行的程序相联系，提出了一种基于时间依赖关系的实时调度模式，并给出了基于此模式的事件驱动并发数据流程图模型及其实现机制。分析表明，该模型能有效地解决传感器网络监测区域中采集流数据处理过程的协作性问题，减少了数据丢失，提高了系统响应的实时性。     

D-S证据理论在电路故障诊断中的应用研究

针对传统的线路切割法在电路故障诊断表现出的诸多问题,提出了一种基于D-S证据理论的多故障分类器的信息融合系统框架模型。在该模型中,基于SVM的故障分类器模型、基于贝叶斯的故障分类器模型和基于神经网络的故障分类器模型中的故障集合的并集共同构成识别框架,并利用Dempster合成法则对测试数据进行融合。实例研究表明,该模型增强了诊断系统的可分析性,有效提高了故障模式的识别能力。     

基于数字孪生的变电设备运维系统及其构建

针对变电设备周期状态管控难、运检效率低等问题,基于数字孪生理论,构建基于真实变电设备运维的数字化模型及系统。首先,在信息层建立能反映变电设备换流变、调相机、GIS（Gas Insulated Substation）这3类设备真实状态的数字孪生体;其次,基于换流变、调相机、GIS历史大数据,通过数字孪生体的变电站设备进行统计分析,并根据采集的实时数据、运维数据来预测变电站设备下一时刻的状态,使变电设备实现实际变电站内物理层与信息层数据的融合;最后,以变电站设备运维为对象,采用信息物理融合系统进行运维数据的集成和同步,形成最终变电设备运维数字孪生框架系统。相关研究表明,运用数字孪生技术可以对变电设备运维系统运行效率的提升和对变电站整体智能化提供强有力的技术支撑。     

多源遥感影像数据融合

综述了多源遥感影像数据融合技术,包括融合的信息表示、融合原理、融合系统框架模型、融合的算法、控制及应用,最后指出了融合中存在的问题、可能解决途径和未来发展趋势。     

基于OSG动车组虚拟维修训练系统研究与实现

研究动车组虚拟维修培训系统,针对提高人员维修和培训水平,为了缩短大型复杂产品动车组维修的培训周期,节约训练经费,传统虚拟维修训练系统实时绘制大型模型能力弱,表达维修对象信息不直观等的问题,为解决上述问题,提出进一步用仿真技术,开发了动车组维修训练仿真系统,构建了维修训练仿真系统的框架、层次信息模型,基于OpenSceneGraph三维引擎,采用了产品装配树的建立、大型模型渲染优化、交互信息显示和拆装仿真等关键技术,并组成系统进行仿真.仿真结果表明系统设计的可行性,能够满足大型复杂产品虚拟维修应用的要求.     

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)

正~~     

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