基于单片机的PLC数据储存系统

为了解决PLC数据储存量低、查阅不便的问题,设计了一种基于单片机的PLC数据存系统,实现了PLC与U盘、移动硬盘等储存设备的数据传输与存储。设计了RS232和RS485共用同一串口的通信接口;基于ModBus通信协议实现了单片机与PLC的数据传输;使用CH376文件管理芯片,在U盘等储存设备里建立txt、doc等类型文件储存数据,方便桌面计算机对数据进行分析处理;利用DS1302实时时钟系统,以时间信息命名数据文件,实现了数据的长时间有序储存。     

基于单片机的嵌入式USB主机系统的实现

在无操作系统的单片机系统中实现USB主机系统功能.对U盘进行文件的读写.并在U盘上实现FAT格式文件系统.使U盘成为单片机应用系统的存储设备.这极大的方便了单片机在数据采集,存储以及传输方面的应用.最后,实现了脱离PC机的对U盘操作的功能,数据能够脱离PC机在U盘之间方便简洁的交换.     

STC15和CH376的实时海量数据采集系统设计

设计了一种基于STC15单片机的U盘实时海量数据采集系统。该系统利用USB接口芯片CH376对U盘进行读写操作,利用实时时钟芯片DS12887实时采集记录数据的时间,将采集到的海量数据以EXCEL文件形式存储在U盘中。实验结果表明,该方案能够采集、存储海量数据而且还兼顾成本低、通用性强、移动性好等优点,具有一定实用价值。     

基于CH375的单片机U盘控制器的设计与实现

介绍了一种以USB接口芯片CH375和单片机为核心,U盘为存储介质的数据存储方案,给出了系统硬件实现和单片机读写U盘的应用程序。实验结果表明,该方案具有成本低、通用性强、可靠性高等特点,可方便地集成到各种测控系统中。     

基于CH378嵌入式存储系统设计

随着军事工业飞速发展,高速数据存储设备成为导弹测试领域不可或缺的一部分。通过对导弹测试领域中现有数据存储设备研究发现当今存储系统存在传输速度低、存储容量小、可靠性差、数据易丢失、严重依赖PC机等缺点,首次提出以U盘作为存储介质用于某型号导弹参数测试领域,以最新的USB串口芯片CH378来设计读写U盘,并独特运用FPGA读写大容量的FLASH构成存储系统的数据缓存部分这一设计理念,最终以STM32F103VE单片机控制CH378将缓存数据写入U盘的设计方案;文中详细介绍了基于CH378的嵌入式存储系统软硬件设计,最后通过软件测试U盘存储速度并用信号发生器模拟传感器信号输出,对比U盘和FLASH中数据并对数据解码分析,验证系统达到高速可靠存储等设计要求。     

基于SL811HS芯片实现对U盘通信

本文主要介绍了一种USB的主从控制器SL811HS。在介绍了SL811HS控制芯片的主要特点的基础上,还阐述了利用这一芯片如何识别U盘,以及如何将单片机的数据按协议规定写入U盘。     

基于USB-Host的大容量数据采集系统的设计

利用USB主控制器控制U盘作为数据采集系统的移动存储器。该设计基于USB主／从控制芯片CH375S，遵守大容量存储设备类规范中的Bulk—Only和UFI子规范，支持FAT16文件系统，实现了数据采集系统中可用U盘进行数据存储，方便与计算机交互；配合液晶和外扩键盘，可以完全抛开PC，实现采集数据的实时显示和指定存储区域内数据的查看。     

基于FPGA和DSPIC30F6014A的数据记录器设计

针对目前飞行数据记录器对数据的大容量和高速存储的需求,提出了一种以DSPIC30F6014A控制USB接口芯片CH378读写U盘数据,并添加FPGA控制读写大容量Flash数据作为高速数据缓冲以实现脱离计算机存储高速大容量数据至U盘的设计方案。该方案能够实现大容量数据存储功能,并能够极大地提高U盘读写数据的速度,具有设备体积小、成本低和便于携带等优点,很大程度缓解了数据存储的压力,具有很广阔的应用前景。     

安全用U盘 弹出很简单

由于即插即用和便于存储数据等特点。U盘已经应用到了工作和生活中。但U盘在使用时也会遇到一些小问题，最常见的莫过于U盘无法正常弹出了，这时如果强行拔出U盘很容易损坏U盘或造成程序数据的丢失。     

在单片机上扩展 USB 接口的设计与实现

本文介绍一种基于SL811HS的单片机读写U盘的系统。系统由单片机、USB接口控制器、高速RAM等设备组成，解决了多数数据采集设备、工控机及嵌入式系统没有安装USB标准接口，不能读写U盘的问题。重点分析系统的原理及传输协议，给出了硬件、软件的实现方法。     

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