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通过ZigBee双向无线通信技术可以实现远程无线自动抄表,有效解决水电表数据的自动采集与远程传输。终端节点与水电表主体采用RS485总线连接。通过测试,论证了ZigBee在无线抄表系统中应用的可行性。 相似文献
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The aim of this paper is to present a reliability modeling and analysis of a two-unit system of a continuous casting (CC) plant. Real maintenance data of a steel production plant have been used for the purpose. Three types of failures were noted: repairable, replaceable and reconditioning/reinstallation. The two-unit system is operating in parallel, on full-reduced installed capacity. Upon the unit failure, an inspection is carried out to decide the type of maintenance task to be performed. Optimized reliability indices of the plant such as mean time to system failure, availability, expected busy periods of the repairman for various maintenance tasks, expected number of visits by the repairman, expected number of repairs, replacements and reconditioning/reinstallation are obtained. Semi-Markov processes and regenerative point techniques are used for the analysis. Profit incurred to the CC plant is also evaluated and related graphs are plotted to demonstrate the results. 相似文献
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本文介绍了ZigBee技术(无线传感器网络技术)的特点和优势,以及与其他几种无线通信技术的区别。详细叙述了KJ296煤矿人员管理系统的特点,以及ZigBee技术在此系统中的应用。 相似文献
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CC许可协议下的机构知识库的建设 总被引：2，自引：0，他引：2
文章阐述CC(Creative Commons)协议及协议的版权授权方式,探讨了CC协议对机构知识库存储方式和授权模式的影响,定义了机构知识库模式的分类,并分析我国机构知识库存在的问题、进展缓慢的原因,CC协议对提高用户参与知识库模式的认可度的提升,提出了基于CC zero协议的自愿式自存储和强制性自存储共建的实施方式及开源协作模式,希望建立强制性存储协议许可政策及相关制度,并研究一套富有实效的方法使存储模式更有利于知识共享的实施。 相似文献
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近年来,日本有越来越多的图书馆开始尝试将馆藏珍贵文献资源进行数字化并在网上公开服务。但从数字人文学角度而言,这些资源存在着"使用范围与规范不明确""公开的数据格式不统一""数字资源的搜索手段不完善"等种种问题,因而可能无法为读者提供有效的服务。"京都府立图书馆珍贵文献收藏"项目是将京都府立图书馆馆藏珍贵文献进行数字化并在网上公开服务,于2019年3月推出第一期,内容为明治时期到战后期(第二次世界大战结束后联合国军占领时期)面向外国游客、以京都为主的城市观光指南。该项目采用了CC0协议(创作共用协议零权利协议)使用许可、DOI机制(数字对象唯一标识符)、IIIF(国际化图像互操作框架),均为世界标准,开创了日本图书馆领域的先河,今后将向全国推广。此次报告我将介绍本系统研发的过程、系统构建的细节。我们还询问了市民与人文学专家的实际使用感受、系统的使用效果与改善意见,也将一并向各位介绍。 相似文献
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针对ZigBee技术的发展现状、规范及ZigBee芯片CC2430的特点,提出了使用CC2430完成分布式温度测量系统的设计方案,包括无线网络的配置、利用芯片内部温度传感器检测环境温度、从节点温度数据的发送、主节点对温度数据的接收及上传给上位机显示等内容.实验表明,基于ZigBee协议的CC2430开发平台的节点温度数据传输方案有较高可行性,易于实现. 相似文献
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The increase of frame rate, though with the potential in a coded ultrasound system, is generally concomitant with the simultaneous transmission of a number of apertures, and in consequence leads to increased cross-talks between different apertures. In view of this, a new coding scheme using staggering repetition interval was proposed. The transmitting signals were constructed by repeating the two （or more） modulated codes using staggering repetition interval, and then allocated to and transmitted simultaneously among different apertures. The decoding process was based on the subsection-matched filter under the assistance of different matched filters for different apertures. At last the outputs of subsection-matched filtering were added together. Staggering changed the positions of cross-correlation （CC） peaks from coinciding, which resulted in an effective reduction of CC. Our theoretical analysis and simulations showed that, the coding scheme can be used to reduce cross-talk, and a good cross-talk reduction will be achieved if the staggering delay is kept in an appropriate range. 相似文献
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陈国童 《宁德师专学报(自然科学版)》2012,24(1):29-31
针对ZigBee技术在无线温度测量系统中的应用,提出了系统的总体构架方案,对系统的硬件和软件进行了详细的分析和设计,并给出该系统的硬件和软件的实现方案. 相似文献
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根据边坡的地形地貌、岩层地质构造等勘察结果,在现场布设多种传感器采集数据。传感器间通过ZigBee无线组网,把数据汇集到协调器．由协调器经GPRSDTU进行远程传输;远端上位机采刷LabVIEW软件编程,对数据进行接收、存储;采用风光互补独立供电系统供电;在实际运行中,发现了多种安全性、可靠性问题,并逐一解决．实际运行一年表明．电源供电稳定、数据传输实时、有效,为进一步的数据融合处理提供了可靠的数据源． 相似文献