无线通信监听中录音功能模拟

无线通信监听中的录音功能模拟是通信侦察设备仿真的重要组成部分,本文分析了采用软件来模拟录音设备的难点,提出了两种模拟实现方案,比较了两种实现方案的优缺点;最后采用底层音频文件的读写方法较好地实现了录音设备的模拟,文中给出了该方法的仿真流程和实现过程,该方法在仿真一致性和实时性上满足工程要求。     

OpenVXI平台上VoiceXML呼叫中心语音系统的研究与开发

本文提出并构建了一种在OpenVXI平台上实现的基于VoiceXML技术的呼叫中心语音系统。该系统在语音卡上编程,为OpenVXI平台提供低层支持,实现了放音、呼叫、识别、录音等相关接口,完成了流程控制服务器,实现了用VoiceXML文档来控制呼叫中心语音流程的功能。系统在实验环境下的测试结果基本符合设计目标,进一步的优化和开发研究工作正在进行中。     

基于组态王软件的无纸记录仪与计算机的通讯研究

通过计算机上的RS232串行通讯接口与无纸记录仪上的RS485通讯接口及MAX202E线驱动/接收器、MAX3080串行通信转换成RS485总线芯片为硬件平台,利用MODBUS通讯协议和组态王软件为软件平台,根据设备串口通讯参数设置,设备生产厂家、名称、通讯方式配置,详细阐述了无纸记录仪的功能参数与组态王的变量名称、类型、寄存器、数据类型、读写属性的对应关系,实现无纸记录仪1375个参数集中管理,可视的操作界面。     

录音接口在程控交换系统上的实现

目前对程控交换机的录音主要是由外置录音系统通过并线的方式来实现,这种录音方式的前提是被录设备接口必须是标准接口设备,否则录音就很难实现。本文在程控交换机上的实现了一个标准录音接口,通过该接口可以实现标准录音系统对非标设备的录音。本文还通过分析录音的构成要素,借助智能网基本呼叫模型阐述了该技术的实现原理。     

基于MT9172的K口通信模块设计

目前,在军用战术互联网无线通信系统中,超短波/短波电台和多频段电台对外提供非标准的K接口供用户数据接入使用。在各类通信控制设备设计中,为实现语音和IP业务数据以无线的方式接入战术互联网[1],需要设计K口通信单元与各类电台进行数据交互。为解决此问题,设计了基于FPGA和MT9172的K口通信模块,FPGA主要实现K接口链路层功能,通过TDM口实现数据接入,按时隙对语音与业务数据进行复接、缓存与发送,实现与电台间的同步与环路信令握手。MT9172主要实现K接口物理层功能,并为FPGA提供串行数据接口。设计实现了野战网接口标准中定义的K口工作模式3,传输速率为128kbps,完成了TDM口到K口的接口转换。经验证,该K口通信模块能够可靠应用于各类需要接入战术互联网的通信控制设备中。     

中文语音合成模块XF-S4240在导航终端中的应用

介绍XF-S4240的功能特点、硬件接口及通信方式,并给出该模块在车载导航终端中的应用实例。实验结果表明,XF-S4240模块的语音效果清晰自然,并且能灵活更改语音内容,因此可以很好地满足车载语音导航的需要。     

SNMP扩展代理的实现

为了方便管理那些不支持简单网络管理协议(SNMP)协议的设备和软件系统，以及扩展现有SNMP网管代理所支持的管理信息，该文提出了一种实用的扩展代理实现方法。利用标准SNMP服务桥接管理者与扩展代理的通信，采用简单设备管理协议(SDMP)规定设备和软件系统管理软件与扩展代理的信息接口，从而增强了网管系统的管理功能，并为实现综合网管提供了一种可借鉴的方法。     

ISD4002与AVR单片机通信及其编程

介绍ISD4002与AVR单片机的通信过程。ISD4002与AVR单片机的相互通信是通过SPI接口。SPI可以用全双工通信方式实现语音录放。其操作具有简单,使用方便,成本低廉等特点。ISD4002能连续录音120分钟,具有音质高,可反复录音,内部集成了大容量的EEPROM,不需要扩展存储器等优点。     

核电厂安全级DCS设备接口模块的研究

设备接口模块是核电厂安全级DCS中进行优先级判断及输出最终专设驱动命令的重要设备。在满足相关法规标准及要求的前提下,为进一步优化设备接口模块各输入命令的接口,同时保证通信的高效性,对设备接口模块的相关内容进行了系统研究。分析了相关法规标准对设备接口模块的要求(如多重性、独立性、多样性及纵深防御等),并对法规标准在安全级DCS设备接口模块的应用进行了详细论述。通过比较国内目前核电厂中常见的几种安全级平台(如AREVA公司的TXS平台、三菱公司的MELTAC-N plus平台、Invensys公司的TRICONEX平台以及西屋公司的Common Q平台)设备接口模块,结合不同安全级平台设备接口模块的通信实现方式,提出了一种改进性方案。该方案兼顾了通信的可靠性及硬接线的数量。相关研究和分析可为安全级设备接口模块的设计提供参考。     

语音传输系统中底层通信控件的开发

利用PB和VC的混合编程技术,设计并开发了语音传输系统中底层通信控件.在该控件中实现并封装了语音信息的打包、压缩、传输、路由等功能,采用回调机制自动处理各种硬件事件.应用证明,该控件实现了对硬件的良好支持,并为上层应用提供了友好的管理控制接口.     

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