手持宽带数字存储示波器的设计与实现

针对野外作业和生产现场测试需要，提出了一种手持宽带存储数字示波器的设计与实现方案，采用可程控宽带信号调理技术实现了200MHz的信号模拟通道设计和高速触发模块设计；采用多通道并列技术实现了200MSps的实时采样，采用基于参量模型的等效采样技术实现了10GSPs的等效采样；采用多任务软件技术实现对系统的管理和人机交互。采用可充电的锂电池给系统供电实现了示波器的便携和在无交流电环境下的测试；测试证明，该手持宽带存储数字示波器具有良好性能和广阔的应用前景。     

美国ZTEC公司新推出ZT4612 LAN数字存储示波器

美国ZTEC仪器公司是VXI、PXI的主要联盟商,独家提供VXI数字示波器模块,是唯一一家在一个模块上实现完整数字示波器功能的厂商。作为先进的仪器设计和制造商,ZTEC提供具有独特优势的VXI、PXI、PCI、LXI模块,将于08年年初正式推出ZT4612 LAN数字存储示波器,晚些时候还交推出LXI数字示波器。ZT4612 LAN数字存储示波器的主要性能参数:4通道,8位精度,带宽为1GHz,采样率为4GS/s。美国ZTEC公司新推出ZT4612 LAN数字存储示波器$北京汉通达科技有限公司     

基于锁相环的高速示波器等效采样系统设计

采用小数分频锁相环芯片ADF4351作为采样时钟发生器,利用FPGA进行等精度测频,运用差频法顺序等效采样原理,设计了最高等效采样率为160 GS/s的高速示波器等效采样系统。同时通过时钟分配器和数字延迟线产生交替采样时钟,利用4片最高采样率为250 MS/s的8 bit ADC进行时间交替采样,使系统的最高实时采样率达到1 GS/s。由于采用低抖动的时钟源,系统在DC到500 MHz的设计带宽内保持了良好的噪声性能,信噪比优于基于DDS技术的等效采样系统。     

基于DSP和FPGA的数字示波器设计

为了测量激光发生器电源模块的重要参数,提出了一种基于DSP和FPGA的数字示波器.分别分析了实时采样和等效采样的基本原理、基于DESO滤波器的滤波原理及其数学表达式;在此基础上,给出了幅度类参数和周期类参数的计算方法,并对各类指标进行了详细计算.整个数字示波器嵌入在激光发生器整体系统中,工程应用性强、集成度高.测试结果表明,数字示波器运行稳定可靠,能够满足设计要求,具有很高的应用价值.     

基于ARM9的嵌入式数字示波器参数测量模块的设计

针对当前数字存储示波器参数测量算法均是基于DSP和内嵌微处理器型FPGA实现的,提出了一种基于S3C2410微控制器(ARM9内核)和μC/OS-Ⅱ实时操作系统的嵌入式数字示波器参数测量软件模块的设计方法;详细分析了参数测量模块中幅度类参数和时间类参数测量算法的设计与实现过程;最后对参数测量软件模块的性能进行了详细测试,同时对测试结果的误差进行了深入的分析;测试结果验证了参数测量模块的准确性和高效性。     

基于VXI总线的通用测试模块的研制

为满足航天测试的需要，设计实现了以DSP FPGA构成的通用测试平台。通过配以不同的功能电路，并辅以相应的FFGA控制电路及DSP算法，就可以方便、快速地实现各种不同功能的VXI测试模块。介绍了通用模块在多通道数据采集中的应用，实测结果达到了100KSPS的采样速率，分辨率达到14-bil。     

全新RIGOL VS5000系列虚拟示波器推动MSO混合测试实践应用

日前，北京普源精电科技有限公司（RIGOL）宣布，全新的VS5000系列虚拟数字示波器进入市场后，受到用户的普遍关注。RIGOL VS5000系列虚拟数字示波器实时采样率高达400MS／s，等效采样率50GS／s，存储深度1M采样点，可提供40MHz至最高200MHz带宽的宽泛选择，满足各类用户的需求。同时，VS5000系列采用UltraZoom技术，结合16通道逻辑分析功能，实现MSO混合测试。     

基于单片机的等效采样示波器设计

介绍了基于单片机系统的精密时钟发生电路对高频信号(1MHz～80MHz)进行等效采样的方法,设计并实现一个模拟带宽为1Hz～80MHz的简易数字示波器。     

基于VXI通用仪器的虚拟示波器设计

详细介绍了基于VXI通用仪器模块HP E1426A的虚拟示波器的组建方法。分析了HP E1426A的性能参数,重点阐述了虚拟示波器的驱动程序、软面板及应用程序的设计。该虚拟示波器已集成于某武器综合自动测试系统中,工作性能稳定。     

LabVIEW环境下基于声卡的虚拟示波器软件设计

基于计算机声卡的虚拟仪器成本低、通用性强,在对采样频率要求不高的情况下,可以用声卡取代数据采集卡进行采样和输出.利用虚拟仪器开发工具软件LabVIEW及其数字声音记录节点,研制出基于声卡的虚拟双踪数字存储示波器,其功能和界面都与真实示波器相同.重点阐述了数据采集、触发控制、显示控制几个主模块的设计方法.     

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