矿井提升机钢丝绳张力监测系统设计

针对矿井提升机存在钢丝绳过载、张力不平衡等问题,设计了一种矿井提升机钢丝绳张力监测系统。该系统采用压力传感器采集钢丝绳张力,采集信号经过处理后以无线通信方式发出,信号接收装置接收数据并通过RS232上传至上位机进行显示,从而实现钢丝绳张力的实时、可靠监测。测试结果验证了该系统的可行性。     

基于WSN和GPRS的嵌入式远程监测系统的设计

为了实现对远端分布式现场进行监测,结合Zigbee和GPRS技术特点,提出一种基于嵌入式平台和无线通信技术的设计方案。该系统采用无线传感器网与移动通信网相结合的组网方式,通过CC2430和SIM300无线传输模块,进行监测信息的采集和汇总,完成信息传递,通过向嵌入式平台发送短信的形式,自动查寻信息。实验结果表明,监测系统设计方案可行。该方案为无线传感器网络和移动通信网的扩展应用提供了参考。     

基于Zig Bee的无线传感器网络在输煤监测系统中的应用

将无线传感器网络应用于煤矿井下输煤安全监测,设计了一种矿井输煤安全监测系统。传感器首先将采集的数据通过无线信道传输到中继节点,然后,通过CAN总线传输到嵌入式控制器,由控制器对数据进行分析,监测输煤过程,保证其运行的安全性。该系统简单、可靠、经济,具有很好的应用前景。     

嵌入式矿井通风机在线监测与故障诊断系统设计

针对现有的矿井通风机在线监测与预警系统存在体积大、维护成本高,采用Windows操作系统缺乏专用性、易误操作等问题,设计了一种嵌入式矿井通风机在线监测与故障诊断系统。通风机和电动机的振动、温度、负压、电压和电流等监测量由对应的传感器和智能仪表传入到PLC数据采集系统,PLC数据采集系统将数据送入以太网模块,系统通过协议解析得到相应数据,显示在嵌入式设备上,并进行实时诊断和故障报警;带有RS485通信接口的振动传感器、温度巡检仪、智能电表,通过ModBus协议将采集的数据传送给嵌入式总线模块,实现监测与诊断功能。测试结果表明,该系统满足矿井通风机在线监测的各项技术指标,同时实现了监测设备的小型化和多样化。     

矿井顶板下沉监测中信号远程传输系统的设计

针对目前大多数顶板下沉监测仪存在的数据收集工作量大、顶板下沉数据无法上传地面等问题,文章提出了一种矿井顶板下沉信号远程传输系统的设计方案,详细介绍了系统的工作原理、数学模型,并确定了关键参数,同时给出了系统硬件电路设计。该系统将顶板下沉数据以频率信号的形式远程传输至矿井安全监测监控系统通信分站的模拟量接口,使得矿井安全监测监控中心可实时监测和采集各个监测点的顶板下沉状态和数据,提高了顶板下沉监测的连续性、真实性。现场运行表明,该系统易与矿井通信分站通信,各项运行指标完全满足煤炭行业所规定的国家标准。     

安全监测系统接入全矿井综合自动化系统的方法

文章在简要介绍神华集团万利分公司万利一矿全矿井综合自动化系统构成、工业以太环网结构及安全监测系统构成的基础上,介绍了该矿安全监测系统通过工业以太环网接入全矿井综合自动化系统的方法,并分析了该接入方法为安全监测系统的工作及其信息的传输所带来的益处。     

煤矿分布式突水监测系统设计

针对现有集中式煤矿突水监测系统人员劳动强度大、数据采集效率低等问题,基于ZigBee无线传感器网络架构,开发了分布式水文与围岩应力采集节点、路由节点和汇聚节点的硬件及软件,设计了一套煤矿分布式突水监测系统。该系统将矿井水文、应力监测集成在统一的网络中,通过上位机对采集数据进行集中处理,可实时在线获取矿井水文与围岩应力的动态变化。测试结果表明,该系统监测精度较高。     

基于安卓终端的物联网控制系统的设计与实现

基于安卓终端对平台进行开发,需要借助移动通信网.本文重点对基于安卓终端的物联网控制系统的设计与实现进行分析.在该系统中,采集信息和信息的传输、处理数据等可以通过短信或GPRS方式实现,该系统可利用物联网实现无线监测.用户只要具备安卓设备,便可对环境数据进行查看和检测,该系统的设计可以实现实时监控.     

基于CAN总线的煤矿安全分布式监控系统

本文针对煤矿监测系统存在网络瓶颈、采集终端不兼容的不足,研究了基于CAN总线的煤矿安全分布式监控系统,根据矿井的特点设计了通用智能环境监控终端和机电设备运行状态监控终端,并通过CAN总线实现多节点高速、高可靠性的网络互联,对煤矿环境安全参数和设备运行状态进行实时监控,各监控终端可根据优先级别自主通讯.主机对全局参数进行信息融合、综合分析与诊断及预警连锁及辅助决策.     

智能式顶板压力监测系统

设计了一种新型的矿井顶板压力采集与手持式智能分析系统。该系统实现了顶板压力数据采集以及无线接收各采集点的压力数据,并能够现场分析、观测,而且还能够将采集到的数据上传给计算机作进一步分析。该系统通过对顶板压力的监测,可为煤矿生产中片帮冒顶事故的预防和顶板安全管理提供可靠的数据和决策依据。     

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