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关键词： RFID   人员定位系统   隧道施工  

摘要： 基于RFID技术研发了隧道人员定位系统,通过将人员身份信息和电子标签绑定的方式,实现隧道内施工人员位置实时定位。管理人员通过该系统能够实时掌握现场施工人员的分布状况和运动轨迹,提高了调度管理的有效性和科学性。当遇到突发情况,可以精确定位被困人员的位置信息,提高抢险救灾、安全救护的效率。该系统在硬梁包水电站地下工程施工中得到成功应用,累计采集人员位置信息数据766万余条,将施工区域及各工种用不同颜色进行划分,实时展示各施工区域的人员数量和位置,并通过每日消息推送功能,建立了一套完整的隧道人员定位信息管理系统,为隧道工程施工人员安全管理提供了参考。

关键词： Sensors   Integrated circuits   Antennas   Codes   Varactors   Radiofrequency identification   Chemical sensors   Auto-tuning antennas   chemical potentiometric sensing   constrained design   pH   radio-frequency identification (RFID)  

摘要： Auto-tuning integrated circuits (ICs), interconnected with radio-frequency identification (RFID) antennas in the UHF band, can provide digital information about the changes in the local boundary conditions in the proximity of the device. This feature, in conjunction with a varactor diode, can be used to create a general-purpose framework for the controlled wireless sensing of chemical agents. The varactor works as a transducer converting the potentiometric output of a chemical sensor into a capacitance change, which in turn is detected by the IC. A constrained optimization method is here introduced to maximize the sensitivity of the above transduction mechanism by deriving closed-form expressions that relate the digital output of the IC to the chemical variation. In this way, said variation will be optimally mapped within the retuning dynamic range of the IC. The method is demonstrated with reference to a pH sensor and is capable of providing a sensitivity of 30 units per unitary pH variation with stable communication performance. Moreover, the application to an on-body plaster-like antenna, namely when there are not fully controllable boundary conditions, demonstrated that the sensing performance is practically unaffected by the placement region over the human body as well as by the inter-user variability.

关键词： 书报柜   STC89C52单片机   RFID   图书馆系统   串口通信   微处理器  

摘要： 文中主要利用单片机、RFID模块等软硬件技术设计智能书报柜,采用串口技术实现数据通信,采用微处理器完成书报柜的智能控制,可以显示借书及还书状态,以及书籍数量,并具有报警功能。书报柜是用户借还书和记录各类信息的重要载体。早期图书馆已有书报架,但其功能仅仅局限于工作人员自己记录收集,操作复杂,功能单一,而智能书报柜是通过识别及自动控制系统实现书报柜的自动开启功能,解决了传统书报柜容易发生书报丢失、人工不足等问题。智能书报柜能够提供方便自主的服务,不仅提高了图书馆的工作效率,同时还降低了人工成本。

关键词： 无设备追踪   信号特征   标签择优   深度学习   射频识别  

摘要： 针对现有人体追踪系统追踪误差大、硬件部署对环境改变大和用户佩戴设备不方便等问题,提出基于择优标签的无设备人体追踪方法.采集人体在不同位置上的射频(RF)功率信号,分析人体所在位置与功率信号之间的关系.为了减缓信号不稳定性对系统的影响,提取射频功率信号的特征作为模型训练的数据集.利用信号特征建立不同的深度学习模型,对比不同训练方式下的追踪效果和标签用量,选择合适的模型结构和训练方式.分析实验结果,给出普适性意见和最优标签选择方法的具体步骤.实验表明,基于择优标签方法的定位系统是可行的,其中跟踪误差为0.19 m,与表现较好的WallSense系统相比,跟踪误差降低约5 cm,标签量降低66.7%.基于择优标签方法的定位系统明显降低了标签部署对环境的影响,在保证精度的情况下,减少了标签冗余.

关键词： RFID技术   计量检测机构   设备管理   现状  

摘要： 随着计量检测产品数量、规模的不断增多,选购设备越来越多,设备专业性、精密度也越来越高,从而增加 了管理难度。如何有效维护管理计量检测结构设备成为了人们关注的重点。RFID技术是一项市场前景好、应用规模 庞大的高新型技术,将其用于计量检测结构设备管理能够有效提升管理水平。本文在充分了解当前计量检测机构设 备管理现状的基础上,基于RFID技术阐述了设备管理系统的应用要点,以期通过分析探讨提高设备管理的智能化 水平。

关键词： 射频识别   双标签   云服务器   物理不可克隆函数   BAN逻辑分析   AVISPA工具  

摘要： 针对医药系统中药品和说明书同时认证的应用需求,提出一种快速双标签身份认证方案。该方案引入云服务器和物理不可克隆函数,确保了射频识别系统的可扩展性和标签的不可克隆性。针对传统射频识别系统逐一认证双标签效率较低的问题,提出一种双标签响应合并流程;针对物理不可克隆函数引发的系统错误认证问题,计算了物理不可克隆函数响应的最佳认证阈值,以降低系统的认证错误率;针对云服务器的不可信问题,提出3种超轻量级位流函数以实现两种加密机制,从而保护前向信道免受云服务器隐私泄露的威胁。安全分析表明,快速双标签身份认证协议可满足标签匿名性和不可追踪性,并能有效地抵抗克隆攻击、去同步化攻击、重放攻击等恶意攻击。此外,使用BAN逻辑分析和AVISPA工具,进一步验证了协议的安全性。与近期的认证协议相比,快速双标签身份认证协议的服务器搜索耗时最短,在满足各项安全属性的同时,以近似单标签的资源开销实现了对双标签的快速认证,适用于资源受限的大规模双标签认证场景。

关键词： RFID   Honey bee   Varroa destructor   Insecticides  

摘要： Several pyrethroids (such asflumethrin andfluvalinate) with low toxicity to honey bees and comparable high toxicityto mites are used worldwide as acaricides. However,flumethrin has been used for a long time in colonies to controlVarroa destructorand the honey bees might be exposed toflumethrin cumulatively, which could affect the health ofhoney bee colonies. This study evaluated the potential adverse effects of directflumethrin exposure on worker beesunder laboratory and colony conditions. Under laboratory conditions, downregulation of genes related to immunewas observed when worker bees were exposed toflumethrin above 1/16 LD50;at levels above 1/8 LD50, olfactorylearning was impaired, and genes related to learning memory were downregulated;and at>1/4 LD50, their lifespanwas shortened. Monitoring with radio frequency identification (RFID) revealed that worker bees in a colony exposedtoflumethrin above 1/8 LD50had a shortened lifespan and reduced foraging ability. When worker bees are exposed to>1/4 LD50offlumethrin, it can lead to excessive rest day behavior. These results indicate that applyingflumethrin incolonies may pose a severe health risk to honey bees and reveal the urgent need to develop non-toxic and highly effec-tive acaricides.

关键词： Sensors   Fingers   Resonant frequency   Internet of Things   RFID tags   Geometry   Tactile sensors   Automation   chipless radio frequency identification (CRFID)   future systems   identification   Internet of Things (IoT)   keypad   security codes   wireless sensors  

摘要： A ten-digit chipless radio frequency identification (CRFID)-based numeric keypad that works on the principle of touch event sensing is presented. The tag is designed to operate using the passive frequency-domain (FD) technique. The proposed tag has ten circular resonator rings for each of the keypad's corresponding decimal digits. Each circular ring resonates at a particular frequency within the 400-MHz band from 2.7 to 7.6 GHz to uniquely identify a digit. Identification is performed by decoding radar cross section (RCS) response of the whole keypad tag. A customized human finger using standard tissue characteristics is modeled to verify the keypad's working mechanism. When the finger is placed on any of the nine resonators, its corresponding resonance disappears from the allocated band. The proposed CRFID keypad sensor tag is built upon a Rogers substrate of 85 x 95 x 0.8 mm volume. The backside of the proposed tag is fully copper filled for an easy interface with a variety of backgrounds, including metallic walls. The design exactly mimics the shape of ordinary keypad. The finger model used in the simulations realizes the practical scenario. This CRFID keypad is deemed an intriguing solution for future automated cities and will help in the conceptualization of Internet of Things (IoT) systems.

关键词： 电子标签   射频识别技术   网版印刷  

摘要： 阐述电子标签的广泛应用和市场需求,分析射频识别技术的优势和网版印刷天线的要点。

关键词： RFID   资产管理系统   射频识别  

摘要： 文章分析行政事业单位在固定资产管理中存在的问题,结合RFID技术在数据实时传输、工作效率、安全性、稳定性等方面具有优势,提出将该技术应用到固定资产管理中来提高管理水平。然后介绍了RFID技术及RFID资产管理系统的架构和功能,最后分析了该技术在行政事业单位固定资产管理中优势,从而实现RFID资产管理系统的智能化及可视化管理。