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关键词： 射频识别技术   建筑材料   建筑智能化   智慧实验室   建筑监测  

摘要： 随着射频识别(RFID)技术的发展,其已逐渐应用于传统建筑行业中。阐述了RFID技术在建筑材料管理、建筑智能化中的应用,通过在智慧实验室管理中的应用和实践,提出了基于RFID技术对混凝土试块和实验室设备进行数字化管理的方案;分析了RFID技术在建筑监测中的应用方向、发展前景以及信息安全技术发展趋势,旨在为拓展RFID技术在建筑领域的应用提供新思路,为基于RFID技术解决建筑领域的技术难题提供参考,推动建筑领域数字化转型。

关键词： RFID   畜禽追溯   物联网   电子耳标   超高频读写器   注塑  

摘要： 针对畜禽产品质量安全追溯监管难的问题,利用无线射频识别(RFID)技术开发了超高频RFID畜禽电子耳标、超高频读写器和畜禽追溯监管平台,实现了畜禽监管的电子化和全程溯源化。在实际应用中对系统进行测试,结果表明,基于RFID技术开发的畜禽追溯监管产品提高了检验检疫监管效率,促进了畜牧业高质量发展,对于推进动物标识及动物产品追溯体系的建设具有积极的意义。

关键词： 射频识别(RFID)电子标签   定位方法   智能化   仓储   物流   物联网  

摘要： 为提高物流仓储定位效率与精度,提出基于射频识别(Radio Frequency Identification,RFID)电子标签的物联网物流仓储智能定位研究。首先,以芯片、天线作为射频标签的核心,设计物联网物流仓储物资RFID信息编码规则;其次,结合自动导引运输车(Automated Guided Vehicle,AGV)和RFID射频识别技术识别标签,基于标签地点信息,实现物流仓储信息的序列编码;最后,引进空间传输模型,在考虑信号传输距离损失的基础上,设计基于接收信号强度指示(Received Signal Strength Indicator,RSSI)测距的仓储智能定位。实验结果表明,设计方法可以提高仓储定位精度和定位工作的时效性,为物流管理提供技术支持。

关键词： 射频识别   多标签   防碰撞算法   物理层  

摘要： 射频识别(RFID)技术作为一种身份识别的关键技术,可以通过无线射频信号实现对物体的唯一识别。然而,随着RFID技术的广泛部署,标签数量激增,对RFID系统性能尤其是防碰撞能力的需求日益增长。该文总结了RFID系统流程和传统防碰撞算法的研究现状,并对基于物理层信息的防碰撞算法进行了详细研究。从阅读器算法策略、天线规模、信道与链路以及标签规模4个维度对物理层的防碰撞算法进行了深入分析,总结了当前技术面临的挑战,并对未来RFID系统的发展进行了展望。

关键词： Wiliot technology   Bluetooth Low Energy (BLE)   UHF RFID   performance tests  

摘要： In recent years, an innovative passive Bluetooth Low Energy (BLE) technology, namely Wiliot technology, has emerged as an alternative to passive UHF RFID. This paper proposes an experimental campaign aimed at measuring and evaluating the performance of Wiliot technology, when applied to typical use cases of passive UHF RFID technology. In particular, 9 laboratory tests were conducted to assess read distances, temperature tests, inventory accuracy, and tracking. The results provide interesting feedback, especially regarding reading distances, inventory accuracy, and temperature, suggesting that Wiliot technology could be successfully utilized in these use cases. The tracking tests, however, revealed some limitations, primarily due to the requirement for the tag to remain stationary in front of the bridge for at least 10-15 seconds to obtain consistent results. Although the number of tests conducted is limited, they represent a first experience with the targeted technology, and the results can be useful to both researchers and practitioners. The former can find suggestions for further tests to enhance the technology and its potential use in real operating environments, while the latter can derive suggestions for possible practical implementations.

关键词： Health care   RFID   Hospital competition   Pharmaceutical supply chain   Game theory  

摘要： Amid hospitals' efforts to enhance operational efficiency and slash costs, addressing inventory inaccuracies in hospital pharmaceutical supply chain has gained urgency. Although radio frequency identification (RFID) technology effectively reduces such inaccuracies, its introduction in vendor-managed inventory (VMI) remains debatable for vendors given the impact of competitive inter-hospital environment and corresponding implementation costs. This study develops a three-level Stackelberg game model to analyze the vendor's strategy regarding RFID adoption within the pharmaceutical supply chain, taking into account different types of competition between hospitals (i.e., public vs. public and public vs. private). We find that the vendor's RFID adoption strategy under both forms of competition is counter-intuitive, with RFID being adopted even when the intensity of RFID in reducing inventory inaccuracy is low, provided the reimbursement rate for public hospital is high. Furthermore, homogeneous competition increases the vendor's need for higher RFID intensity, while heterogeneous competition heightens the requirement for a favorable reimbursement rate. Finally, both homogeneous and heterogeneous competition can facilitate RFID adoption, with the preference depending on diagnosis cost, reimbursement rate and RFID intensity. This study offers fresh perspectives on the intricacies of vendors' decision-making processes for RFID adoption in healthcare, emphasizing the significance of competitive dynamics and strategic management of medical consumables.

关键词： passive tag   RFID   harmonic tag   Van-Atta array   Retrodictive array  

摘要： We propose a retrodirective harmonic tag using a planar unidirectional dual-frequency antenna in a Van-Atta array. In applying the Van-Atta array to harmonic tags, we address the constraints on element spacing. In the effectiveness evaluation, we demonstrate both computationally and experimentally that the proposed design offers advantages in terms of gain and coverage range compared to a Van-Atta array using singlefrequency antennas and an array without retrodirective characteristics.

关键词： Sensors   Permittivity   Resonant frequency   Chipless RFID   Bandwidth   Resonators   Liquids   Soil measurements   Backscatter   Temperature sensors   Chipless radio frequency identification (RFID) tags   liquid sensor   permittivity sensor   sensors  

摘要： This article proposes a compact and low-profile chipless radio frequency identification (RFID) sensor, with identification and sensing capability, the latter enabled by permittivity variation of integrated liquid. The design comprised one modified meander line that backscatters the horizontal polarization (sensing polarization) and two meander lines that backscatter the vertical polarization (identification polarization). The proposed sensor can detect the appearance of liquids and its volume based on the liquid's permittivity (from 1 to 15) using only resonant peaks of S-11. Furthermore, it is capable of simultaneously executing sensing and identification, i.e., the measurement results can be linked with the unique tags ID. The sensor is demonstrated for detecting cold-chain breaks in frozen food applications, and soil moisture content. However, any other application where a material changes its permittivity based on sensed value is feasible. The proposed tag has a narrow peak with a 3-dB Q-factor of 16.8 in sensing polarization and 35.8/14.4 for ID1/ID2 in identification polarization, owing to its small size of 0.2 x 0.2 lambda(2 )(0) (at 6.3 GHz).

关键词： Broadband antennas   p-i-n diodes   p-i-n diodes   radio frequency   identification (RFID)   identification (RFID)   RFID tags   RFID tags   steerable antennas   steerable antennas  

摘要： Blind source separation (BSS) technology is employed to address anti-collision detection of frequency-coded chipless radio frequency identification (RFID) tags, where multiple mixed backscattering signals are required to be separated. To enable multi-tag detection in chipless RFID, the antenna is required to feature a broad impedance bandwidth, dual polarizations, wide half-power beamwidths (HPBWs), and, most importantly, pattern reconfigurability controlled electrically. To achieve these design goals simultaneously, a pattern reconfigurable antenna with 20 diverse patterns and 100 detection states is proposed over 2.06-6.37 GHz (120%). The proposed antenna is constructed as an antipodal Vivaldi topology, where various patterns are controlled by the switching of diodes. To validate its capability, the proposed antenna is applied to multi-tag detections for 5-bit chipless RFID over 2.0-5.0 GHz. When four chipless tags separated by only 6 mm are present, the proposed antenna can generate various beams to accommodate the number of tags, collecting mixed backscattering signals for the processing using independent component analysis (ICAs). Due to various samples collected with diversity, the mixed signals can be separated and identified into individual IDs, demonstrating the potential of the proposed antenna for multi-tag detection in chipless RFID applications.

关键词： Headphones   Metals   Coils   Oral communication   Vibrations   RFID tags   Microphones   RF signals   Eavesdropping   Sensors   RFID   conversation eavesdropping   coil vibration   out-of-vocabulary word  

摘要： As one of the most essential accessories, headsets have been widely used in common online conversations. The metal coil vibration patterns of headset speakers/microphones have been proven to be highly correlated with the speaker-produced/microphone-received sound. This paper presents an online conversation eavesdropping system, RFSpy, which uses only one RFID tag attached on a headset to alternately sense metal coil vibrations of headset speaker and microphone for eavesdropping on speaker-produced and microphone-received sound. In some accessible scenarios, assuming attackers secretly attach a small, battery-free RFID tag under one ear cushion of an eavesdropped user's headset without being noticed. Meanwhile, RFID readers are camouflaged as decorations placed in/out of rooms to transmit and receive RF signals. When the eavesdropped user talks with other users online through the headset, RFSpy first activates the RFID tag to capture the metal coil vibration patterns of headset speaker and microphone upon RF signals. Then, RFSpy reconstructs sound spectrograms from the RF signal-based vibration patterns for not only trained words but also untrained (i.e., out-of-vocabulary) words utilizing designed SSR network. Finally, RFSpy converts the sound spectrograms to conversation content through sound recognition API. Extensive experiments demonstrate that RFSpy can eavesdrop on online conversations with out-of-vocabulary words effectively.