Solaris 8操作系统实时能力的分析

随着实时应用变得越来越重要，人们希望能在Solaris等通用操作系统上开发和部署实时应用。对Solaris8操作系统的实时能力进行了分析，介绍了一个实时应用实例，提供了丰富的实时特性和良好的实时环境。     

基于RTX和LabVIEW的多任务实时测控系统

介绍了一种基于RTX和LabVIEW的多任务实时测控系统，该系统利用RTX来增强Windows的实时性，实时任务部分运行于实时子系统RTSS下，非实时部分则运行于Win32子系统下。实时部分和非实时任务之间的通信通过共享内存的方式实现。利用LabVIEW开发了人机交换界面。最后通过运行证明，系统满足了实时性和稳定性的要求，验证了方案的可行性。     

嵌入式Linux的中断处理与实时调度的实现机制

论述了实时嵌入式Liunx的实时机制，详细讨论了实现实时的两种方法:一种是硬件和软件相结合的中断机制，一种是实时调度机制和各种实时算法。     

基于模糊控制的实时任务调度策略研究

研究了工业控制网络的实时应用特性，建立周期信息和非周期信息发送优先级的模糊控制模型，并提出了一种新的实时信息调度方法。分析了信息调度的实时性和总线的利用效率，并与典型的现场总线实时能力作了比较，分析说明了基于模糊控制的实时任务调度策略(FCSS)较好地解决了周期信息和非周期信息的实时发送问题，可以有效解决控制网络实时信息的传输和总线资源利用率之间的矛盾。     

基于实时数据库的虚拟仪器数据管理方法

比较了虚拟仪器中数据管理的不同方法，将实时数据库技术引入虚拟仪器数据管理中，提出了基于实时数据库管理的虚拟仪器系统模型，分析了实时数据库的特点，接口和实时事务调度方法。     

自治水下机器人实时仿真系统开发研究

针对自治水下机器人(AUBs)开发和研究中的瓶颈问题，该文开展了AUV实时仿真系统的研究工作。该文提出了采用半实物实时仿真模式，建立实时仿真系统平台的方案，并对实时仿真系统平台的硬件结构和软件结构进行了详细设计。在方案设计的基础上，正在进行实时仿真系统平台开发和研制工作。     

温室农业生产监控组态软件中的实时数据库系统

介绍了在面向温室农业生产监控过程的工控组态软件建设中，实时数据库系统的设计。通过对实时数据库时序一致性的讨论，说明了实时数据库时序一致性的概念和定义，并针对实时数据库系统的特点，分析并实现了实时数据库的结构、存储、功能模块和事务调度．     

基于RTX的卫星姿轨控系统地面实时仿真系统

介绍了RTX的实时功能原理和RT—TCPIP的实时通讯机制，并且比较了Windows操作系统和基于RTX实时扩展操作系统在实时精度方面和实时通讯方面的性能。卫星姿轨控系统地面仿真试验系统在卫星研制过程中起着举足轻重的作用。针对该系统的实时性要求，讨论了基于RTX的实时仿真系统的软件设计和实现方法，并给出了仿真实验结果。实验结果证明，该系统实时性高，工作稳定可靠，满足实际实验要求。该文对实时性要求高的仿真系统具有一定的参考价值和指导意义，     

通用操作系统实时扩展的分析和比较

通用操作系统由于存在实时缺陷，因而难以直接将其应用于实时领域。为此需要对通用操作系统进行实时扩展。文章研究了通用操作系统实时缺陷的产生机理，并对已有通用操作系统实时扩展方案进行了分类、分析对比，总结了它们的特点和不足。     

面向消息的实时中间件的研究与实现

研究了实时信息的特征、实时服务网络模型和面向消息的中间件设计方法，并在此基础上对实时出版订购模型、消息传递的中间件分别进行了设计，构造了实时中间件整体的模型，最后给出了面向消息的实时中间件的部分实现。     

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