VxWorks下声纳基阵稳定控制系统的软件实现

介绍了VxWorks操作系统中任务间的通信,声纳基阵稳定控制系统的结构,主要功能,软件任务的划分,在VxWorks中这些任务的实现及任务间的通信。同时介绍了VxWorks任务与Zinc任务的通信及实现,并对VxWorks任务间通信机制的性能作了比较,分析和总结。     

先进飞机配电系统电气负载管理中心控制器设计

介绍了ELMC在自动配电系统中的地位和模型,结合某型飞机ELMC电力汇流条的分布图分析规划了ELMC控制器仿真平台软硬件资源配置,并在此基础上完成了基于DSP的硬件平台和基于μC/OS-Ⅱ实时操作系统的软件平台;分析系统的运行情况,表明系统能够实现多任务可靠调度、400Hz交流信号实时采样、通信双通道实时切换和BIT等关键技术指标.     

基于VxWorks的多任务程序设计

VxWorks是一种嵌入式实时多任务操作系统,以其良好的可靠性和卓越的实时性被广泛地应用在航天、航空、通信等领域中。随着嵌入式系统功能的不断复杂和性能需求的不断提高,多任务程序的合理设计对嵌入式系统软件的稳定、可靠运行起着重要的作用。文中对VxWorks下的多任务调度机制进行分析,然后介绍多任务程序设计过程中任务优先级的设置、多任务间通信、中断处理等关键要点,结合FC通信的应用实例给出多任务程序设计的步骤和方法,在实际应用中验证了设计的合理性和可靠性,为基于VxWorks的多任务程序设计提供一定的参考。     

基于DSP的ARINC429通信板卡设计

针对目前先进飞机自动配电系统的要求,设计了一款扩展性和可靠性好的ARINC429通信板卡.运用FPGA技术完成接口逻辑控制和全局时钟分配(倍频或分频),采用HI-8582协议芯片和多路开关相互配合构成可动态配置的多收/发通道,简化了硬件电路复杂度;使用混合冗余和大电流保护技术提高了通信可靠性,同时开发了基于VxWorks的板卡驱动.在某飞机配电地面系统中的测试结果表明,该板卡能够实现ARINC429总线系统的相关功能,运行稳定、波形良好,有一定的推广意义.     

基于VxWorks的动中通天线控制系统软件设计

介绍了VxWorks实时操作系统实时性和多任务环境的特性.在分析了天线控制系统基本原理的基础上,提出天线控制系统的各个任务模块的划分原则,介绍了各个任务的优先级别和触发方式.提出了各个任务间的通信手段与同步方法.此外,还给出了在PC104嵌入式计算机上,应用VxWorks实时操作系统成功开发天线控制系统软件的实例.     

先进飞机自动配电系统的设计基础研究

电气负载管理中心是实现航空电气负载控制和管理自动化的重要组成部分,其主要任务是通过机载总线和供电系统处理机交换控制和状态信息,以实现对先进飞机二次配电中心的分布式电力汇流条和固态功率控制器的监测与控制;文章根据电气负载管理中心的功能需求与VxWorks的内在需求,在硬件上进行模块设计,在软件上划分了应用任务并分配了任务优先级,此系统可以大大提高飞机配电系统的可靠性和可维护性.     

基于Linux串口通信的雷达天线数据交互设计

雷达天线的控制系统与雷达任务处理系统之间的通信多采用串口通信方式,交互的内容包括雷达天线方位、状态和对天线的控制命令等。该文先介绍了串口及linux串口设备文件,然后详细设计了Linux系统下的串口编程以及需要注意的相关参数设置。经长期运行证明,该设计能够满足数据交互的要求并具有相当高的可靠性。     

无人直升机实时机载和地面站软件架构设计

研究了无人直升机飞行控制系统实时软件系统设计架构,针对机载嵌入式飞控计算机系统和地面站计算机系统,提出了基于VxWorks实时操作系统的多线程任务机载软件设计方案和基于WindowsXP操作系统的地面站软件设计方案,有助于加快完成无人直升机飞行控制系统的设计和验证。机载系统软件设计为数据采集和测量、伺服舵机驱动、飞行控制与发动机控制实现、通信和数据请求存储等功能。地面站系统软件设计为与机载系统的数据通信、终端用户操控,以及实时飞行状态监视等功能。利用组件对象模型设计技术实现了系统软件设计的模块化、软件结构分层组件化,方便了软件系统的集成与扩展。采用多任务线程机制,有效地满足了飞行控制系统实时性要求。利用实时操作系统的定时器任务机制,确保飞行模式的任务管理和调度。依据所提出的软件设计架构完成了实时机载软件和地面站软件组件模块的设计与开发,而且软件集成快捷方便。研究成果已成功应用于某型无人直升机飞行控制系统。     

VxWorks下PCI设备驱动程序设计

VxWorks是一个运行在目标机上的高性能、可裁剪的嵌入式实时操作系统,以其良好的可靠性和卓越的实时性被广泛应用于通信、航空、航天等多个领域中.根据当前最流行的交换机的设计思想,讨论基于MPC8245嵌入式处理器和VxWorks下的PCI总线的驱动程序以及PCI设备的查找.     

基于WindML的界面开发在工程中的应用

介绍了嵌入式操作系统VxWorks的界面开发组件、MndML（wind Media Library）在工程中的应用，阐述了界面开发中任务的多线程运行、图片的加载、按钮控件的实现、任务问通信机制以及数据的以UDP方式接收并显示等概念及功能实现，并且给出了应用中主要的实现代码。     

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