一种改进的蓝牙设备发现过程及其仿真

蓝牙是一种基于跳频通信的无线技术,在设备建立连接之前,必须通过设备发现过程找到邻居设备并获得它们的跳频信息.非协作设备虽然不参与组网,但参与了设备发现过程,导致设备发现过程所用的时间增加.文中对设备发现过程及来自非协作设备的干扰进行了分析,提出了一种改进的方案.该方案利用CoD字段携带网络编号信息,在设备发现过程结束前识别出非协作设备,并阻止它们参与到设备发现过程中来,从而加速了此过程.最后将该改进方案和蓝牙规范中的方案进行了对比仿真试验.仿真结果说明,在有非协作设备干扰的环境中,改进后的方案几乎消除了非协作设备的干扰,加速了设备发现的过程,最终加快了组网速度.     

基于GPS的低成本车载导航设备的研究实现

首先分析车载导航设备的核心功能,说明低成本实现方案的可行性.在此基础上,给出低成本车载导航设备的硬件框架,并对关键部件进行功能阐述.而后从导航原理、嵌入式GIS、图形开发、编码规范、程序运行、内存使用几个方面论述设备的软件系统.接着,通过实验证明该低成本车载导航设备较好地实现了车载导航设备的核心功能.最后,通过与高档车载导航设备的成本对比,体现了该设备的成本低.     

嵌入式Linux的设备驱动研究与开发

首先介绍了嵌入式Linux环境下设备驱动程序的开发流程,详细描述了Linux设备驱动程序的体系结构和Linux设备文件的概念.然后通过一个例子描述了如何设计和编写Linux设备驱动程序,并解释了其中的核心代码.最后构建一个Glade工程来调用这个设备驱动程序,完成测试工作.     

Linux下有中断端点的USB设备驱动的实现

手写板是有中断端点的USB设备,为了在Linux下实现此类设备的驱动,分析了USB设备的基本概念和Linux设备驱动原理,对Linux下设备驱动程序的内部机制和框架构成进行了研究.在此基础上,提出了引入信号量机制控制内核线程同步的方法来实现read函数,进而设计出Linux下有中断端点的USB设备的驱动程序.通过编写应用程序和设计对比实验,证明了此驱动可以准确、高效地读写设备.与针对中断端点普遍采用的输入子系统方式相比,简化了程序设计,提高了系统效率.     

EPA设备鉴别安全机制的研究

在EPA控制网络中,为防止非法设备的物理接入而产生网络攻击的风险,提出了一种新的设备鉴别安全机制.该设备鉴别机制利用现场设备的惟一设备标识符、设备安全序列号以及本地时间戳,由哈希运算生成鉴别码,鉴别服务器通过比较鉴别码来判断现场设备是否为合法接入设备.对EPA控制网络的实际测试表明,该安全机制很好地保证了EPA控制网络的接入设备为合法设备,从而提高了EPA控制网络运行的安全性能.     

嵌入式Linux设备驱动的研究与开发

本文首先介绍了在嵌入式Linux环境下设备驱动程序的开发流程,详细描述了Linux设备驱动程序的体系结构和Linux设备文件的概念.然后通过一个例子描述了如何设计和编写Linux设备驱动程序,并解释了其中的核心代码.最后构建一个Glade工程调用这个设备驱动程序,并完成测试工作.     

基于设备级备份系统的按需恢复方法

提出了一种在设备级备份系统基础上的数据按需恢复方法,这种方法突破了设备级备份只能实现设备级恢复的限制,使得设备级备份系统能够提供数据的设备级、数据块级和文件级的按需恢复.按需恢复方法通过虚拟设备技术实现.这种技术具有一定的通用性,并详细介绍了虚拟设备技术的设计与实现.     

针对可移动设备的TCG软件协议栈的扩充

TSS即TCG（trusted computing group）软件协议栈是基于TPM（trusted platform module）片上系统的支撑软件.但TSS无法直接获取可移动设备数据并满足它的特殊安全需求,所以针对移动设备对TSS框架进行了扩充,增加了PDDL（可移动设备驱动库函数层）和PDSI（可移动设备服务接口层）两个模块.实现了在扩充了的TSS基础上可移动设备的安全应用,使得可移动设备纳入了整个可信体系.     

基于EFI的USB设备驱动的开发

可扩展固件接口(EFI)是英特尔提出的下一代BIOS的全新架构,将会逐步取代现有的BIOS.EFI提供了对USB设备的支持,用户无需进入操作系统,就可以使用USB设备.以USB设备驱动程序开发为例,描述了EFI下设备驱动程序开发的一般过程和方法.包括EFI下驱动模式的分析,USB协议架构和传送方式的解析,以及如何开发EFI下的USB设备驱动程序.     

工业设备智能信息管理系统的研究

随着企业计算机应用的不断推广,企业信息化应用水平的不断提高,企业越来越需要车间层的工业设备管理信息系统.本文提出了一种工业设备智能制造执行系统的体系结构,并实现了其中的设备管理维护模块.本文介绍了工业设备智能信息管理系统的功能模块分析、UML建模以及数据库建模,给出了Web平台下的设备维护的原型系统.实现了其功能.     

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