基于ARM和GPRS技术的基站监控系统研究与设计

针对移动通信基站监控系统中,监控设备干接点和光纤环组网方式无法直接将故障信息发送给基站维护人员的问题,本文提出一种基于ARM(Advanced RISC Machines)和GPRS(General Packet Radio Service)的基站监控系统。该系统以GPRS网络作为远程数据的传输平台,充分利用远程监测分站、GPRS网络和监测中心三部分的协同,有利于维护人员通过稳定可靠的GSM网络实时的获取各个通信基站的运行情况,极大的方便了通信基站的维护。通过实时获取所有通信基站的运行情况,可以在通信基站发生故障之前排除故障,提高通信基站的稳定性。     

无线通信中使用随机天线阵列的物理层传输探讨

为了可以保证无线通信系统能够高效地进行信息通讯工作,通常我们会采用RAA法也就是随机天线阵列的物理层传输法,这种方法既可以充分保证信息的通信安全也可以保证通信质量。它通过采用在基站架设天线阵列的同时在移动端采用单天线使基站可以根据从移动端接收到的同步训练符号计算出信道范围,基站从天线阵列中随机选取一部分天线对信号作加权发射处理。移动接收点可以将从各天线传来的信号进行同相叠加并作最大似然解调。由于发射符号时基站所使用的天线都是随机变换的,如果有人对发射信号进行窃听,其设备信道也必须进行随机的调整变换,导致其盲均衡算法失效,使得通信安全得到有效地保证。不同于传统的随机加权系数法,随机天线阵列的物理层传输法功耗利用率更高。我们通过一些模拟仿真实验证实,在给定的功率下,随机天线阵列的物理层传输法相比起已有方法能够在期望用户处等到更低的误码率,从而大大提高通信安全与通信质量。     

计算机视觉技术在通信基站天线检测中的应用研究

随着通信基站的天线数量越来越多，部署天线的效率问题致使自动检测抱杆上的天线数量、判定天线、抱杆的从属关系成为热点研究课题。而基站天线的位姿受所处环境的影响，随时可能出现变化，进而导致电磁信号的强度和覆盖范围改变。计算机视觉可以应用于通信基站中天线和抱杆的目标识别，可以实现对板状天线位姿的自动化检测，还能够用于判定天线和抱杆的从属关系。     

基于GPRS的通信基站监控系统设计

设计一种基于GPRS的通信基站远程监控系统,实现监控中心对基站动力与环境设备的远程自动监视与控制。基于基站远程监控系统组网结构,设计基于ARM7微处理器为核心的基站监控系统硬件系统,完成包括MC35i模块的接口电路设计与系统软件设计。监控系统的实际应用验证设计的有效性。     

基于Zigbee技术无线投票表决器基站设计和实现

设计了一款以ARM7芯片AT91 SAM7X256为核心心,μC/OS-Ⅱ为操作系统的基于Zigbee技术无线投票基站.该基站用于连接Zigbee网络和以太网.实现了无线投票表决器远程监控和多会议室同时投票功能.主要分析了该基站的软件设计,介绍了基站如何建立无线投票表决器网络,收集表决器的投票情况,接受远程监控访问的过...     

基于AISG2.0协议的电调天线远程控制单元的设计实现

电调天线远程控制单元(RCU)是进行天线下倾角调节和天线状态远程实时监控的核心部件。本文从实际应用出发,阐述了RCU的硬件设计和相关软件模块的实现,并对RCU与基站对接过程中容易被忽视的问题进行了简要概述。     

基于PSTN的蓄电池远程监控管理系统的设计与实现

针对蓄电池基站相对分散，距离较远，数量多，布线困难的特点，介绍了一种用多Modem通讯组建远程监控系统的方案，设计并实现了一个基于公用电话网的蓄电池远程监控管理系统。该系统能实现对蓄电池基站各节电池的状态监控。     

基于TCP/IP协议的远程配置与监控系统

主要介绍了一种基于TCP／IP协议的远程配置与监控系统，包括它的功能和特点以及该系统的软、硬件实现方法。该系统采用服务器／客户端模式，利用TCP／IP协议通过Internet网络实现设备工作参数的远程配置和设备运行状态的远程监视和控制，将该系统用于全IP移动通信系统基站的远程配置和监控，结果显示该系统能够很好地完成基站的远程配置和监控功能。     

一种用于环境监控的WSN基站的设计与实现

针对无线传感器网络在环境监控应用中的特点,设计并研制了一种较为通用的无线传感器网络基站.该基站基于ARM9处理器设计,集计算存储、无线收发和智能控制等功能于一体,可以通过Internet实现对监控现场的远程监控.介绍了其主要硬件和软件设计方案,并给出了测试运行结果.     

移动通信基站节能监控系统的设计

设计了一种移动通信基站节能监控系统,通过S T M 32 F407单片机将模块整合,并设计了数据采集器与监控平台.智能控制器对基站内外温湿度检测,实现了控制新风机与空调的启停,并通过监控平台来远程监测基站设备情况.测试结果表明,本系统具有良好的稳定性,节能效果显著,具有一定的实用价值.     

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