基于Windows＋RTX的伺服作动系统测控软件开发

文章以某伺服作动系统测试设备的软件研发为背景,针对Windows系统由于线程优先级少、隐含不确定的线程调度机制以及优先级倒置等原因而造成的非实时性差,无法满足实时测控要求的缺陷,通过设计一种基于RTX和VC＋＋的多任务实时测控系统,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。该系统利用VC＋＋开发人机交换界面。解决了在Windows无法进行实时测试的缺陷,搭建一种在Windows下实时测控的软件平台,实现了在Windows平台下对伺服作动系统的功能和性能实时检测。     

基于RTX的水下航行器实时仿真研究

传统半实物实时仿真设计方法已无法满足不断发展的水下航行器仿真系统对实时性的要求;针对这一实际应用问题对基于RTX的水下航行器实时仿真的关键性问题进行了研究,并详细给出了仿真系统的设计方案和实现途径;实验结果表明,该实现方法使得系统实时性和可靠性都能满足设计指标,极大地提高了水下航行器仿真系统的实时性,在工程实际中具有研究和应用价值。     

3D空间坐标输入装置驱动软件的研究与实现

一、程序总体设计作为硬件的驱动程序首先要保证实时性,只有满足实时性的要求才能使有用数据不丢失,而且数据的有效性也有保证。从程序总体结构的设计上利用了Win32的新特性:使用进程和线程的非抢占多任务,即允许多进程与多线程同时执行实现多任务。一个程序可以有多个进程,一个进程又可以有多个线程,可以利用不同的进程去完成不同的任务,而且象进程一样,一个线程通过分配一个优先权级别来决定获得时间片的大小,这样可以定义用哪个线程处理实时任务,用哪个处理非实时任务。     

操作系统多任务应用模式实验开发

多个任务的并发执行是计算机操作系统的一个主要特征,为了满足Windows下分时多任务,或实时多任务应用系统的开发,给出通过C程序设计对操作系统中多任务并发执行设计模式开发,提出Windows下利用时钟中断方式进行多任务并发执行的方法。该模式实现系统内多任务在宏观上的"同时"运行,解决Windows环境下用户应用开发自己的分时,或实时多任务应用系统的一般方法和结构。     

操作系统多任务应用模式实验开发

多个任务的并发执行是计算机操作系统的一个主要特征．为了满足Windows下分时多任务,或实时多任务应用系统的开发,给出通过C程序设计对操作系统中多任务并发执行设计模式开发,提出Windows下利用时钟中断方式进行多任务并发执行的方法。该模式实现系统内多任务在宏观上的“同时”运行,解决Windows环境下用户应用开发自己的分时,或实时多任务应用系统的一般方法和结构。     

雷达健康管理软件中的并行处理技术

中央BIT软件是专门针对雷达系统研制的在线健康管理软件;应对工程应用中的实时性要求,采用“多任务并行”思想进行内核数据处理流程设计;简要介绍了雷达中央BIT软件的功能和技术优势;描述了软件中定义的健康数据包的组织结构以及任务处理流程;围绕雷达健康数据包的并行处理技术,重点阐述了软件实现中的多任务数据管道、模块线程以及线程间的数据传递机制;提出了多任务并行处理的时间效用分析方法,以及针对实时性瓶颈的解决措施;工程实例分析结果表明该方法能够有效评价并指导并行处理方案设计;所提出的并行处理技术和分析方法,可为Windows平台上同类软件的研制提供借鉴.     

基于Windows的开放式数控系统实时任务调度研究

对以Windows操作系统为平台的开放式数控系统实时多任务处理方案进行了研究。在探讨了基于Windows的多任务和多线程的实现方法、Windows的任务调度模式和实时性的实现形式的基础上,应用VC++6.0编程,给出了基于Windows XP开发的开放式数控系统的模块框架、多任务调度实现方案,并提出了一种新的处理实时性任务的方法;实现了数控总控软件的实时任务调度和多线程的应用。     

PC总线微机上实时监控软件的实用设计方法

本文着重介绍PC总线微机上监控系统软件方案的设计方法,从实时性和多任务性要求深入分析了采用MS-DOS,Windows3.0和实时多任务操作系统等实现监控系统软件的可行性、实现步骤及优缺点。     

Windows NT的线程及其编程技术

线程(Thread)是Windows NT引入的先进技术之一。实际上,如果没有线程可能就不会有Windows NT的占先式(Preemptive)多任务。因为线程是Windows NT的唯一执行单元,Windows NT就是靠线程的优先级及分配给线程的CPU时间来调度线程,进而达到占先式多任务目的的。Windows NT本身的许多应用程序也利用了线程的特性来满足用户的需要,如Programm Manager、Task Manager等。为了使开发的应用程序可利用线程完成特定任务,Windows NT也为开发人员提供了编程接口。因线程对多数开发人员     

基于多线程技术的用电管理信息系统

设计了一个采用多线程编程技术的用电管理信息系统的整体架构与软件功能模块,详细分析了系统中多线程技术的实现、线程的划分及线程之间的关系。该系统充分利用了多线程同时执行多任务的特性,完成了实时大规模电力抄表、自动电表充值和数据管理等任务。     

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