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标准号: SJ 21651-2021

摘要： Provides a listing of current committee members and society officers.

关键词： Location awareness   Dipole antennas   Radiofrequency identification   Antennas   Internet of Things   Integrated circuit modeling   Equivalent circuits   Anomaly detection   radio-frequency identification (RFID) coupling   refined localization  

摘要： We study a new problem, refined localization, in this article. Refined localization calculates the location of an object in high precision, given that the object is in a relatively small region such as the surface of a table. Refined localization is useful in many cyber-physical systems such as industrial autonomous robots. Existing vision-based approaches suffer from several disadvantages, including good lighting conditions, line of sight, prelearning process, and high computation overhead. Also, vision-based approaches cannot differentiate objects with similar colors and shapes. This article presents a new refined localization system, called Trio, which uses passive radio frequency identification (RFID) tags for low cost and easy deployment. Trio utilizes RF interference for tag localization by modeling the equivalent circuits of coupled tags. We implement our prototype using commercial off-the-shelf RFID reader and tags. Extensive experiment results demonstrate that Trio effectively achieves high accuracy of refined localization, i.e., < 1 cm errors for several types of main stream tags.

关键词： Soil temperature  

摘要： Billions of Radio-Frequency Identification (RFID) passive tags are produced yearly to identify goods remotely. New research and business applications are continuously arising, including recently localization and sensing to monitor earth surface processes. Indeed, passive tags can cost 10 to 100 times less than wireless sensors networks and require little maintenance, facilitating years-long monitoring with ten’s to thousands of tags. This study reviews the existing and potential applications of RFID in geosciences. The most mature application today is the study of coarse sediment transport in rivers or coastal environments, using tags placed into pebbles. More recently, tag localization was used to monitor landslide displacement, with a centimetric accuracy. Sensing tags were used to detect a displacement threshold on unstable rocks, to monitor the soil moisture or temperature, and to monitor the snowpack temperature and snow water equivalent. RFID sensors, available today, could monitor other parameters, such as the vibration of structures, the tilt of unstable boulders, the strain of a material, or the salinity of water. Key challenges for using RFID monitoring more broadly in geosciences include the use of ground and aerial vehicles to collect data or localize tags, the increase in reading range and duration, the ability to use tags placed under ground, snow, water or vegetation, and the optimization of economical and environmental cost. As a pattern, passive RFID could fill a gap between wireless sensor networks and manual measurements, to collect data efficiently over large areas, during several years, at high spatial density and moderate cost. © 2021, CC BY-NC-ND.

关键词： 天线   IC卡   射频识别  

摘要： 本文章简述了金融IC卡和交通互联互通IC卡读写终端应用中13.56Mhz射频识别天线的设计原理及实际经验。文章可作为金融或者交通、医保等领域非接触L1过检及天线设计调试的参考。

关键词： Radio-frequency identification   Cross-validation  

摘要： UHF-RFID is a mature and widespread technology that has the potential to increase the reliability and efficiency of processes in logistics and production environments. However, complex interference effects in indoor environments pose challenges to the implementation of reliable wireless communication systems like RFID. This work proposes a method for tag performance evaluation utilizing a coherent two-stage rating process. This enables the abstraction of physical quantities and facilitates the interpretation of tag readability. For this purpose, two well-established full-wave techniques are utilized to perform deterministic simulations of a logistical UHF-RFID use-case. The setup of large-scale simulation environments is discussed and important quantities to be considered in RFID-systems are derived. Based on the simulation results and the proposed rating method, the RFID use-case is evaluated. Results are visualized in full-3D, facilitating the identification of critical spots. Furthermore, a subsequent cross-validation of the simulation results is performed, verifying the validity of the simulation results. By performing a priori propagation analysis, issues can effectively be revealed beforehand and costly modifications after system deployment can be avoided.

关键词： Critical discharge   Entrainment   Rivers   Run-of-river dam   RFID tracers   Weir  

摘要： Coarse sediment transport in fluvial systems serves an important role in determining in-stream physical habitat, spawning potential and benthic community structure. However, despite more than a decade of pressure in Europe to restore stream continuity under the Water Framework Directive (WFD), there have been relatively few empirical studies on how low-head, run-of-river structures (i.e., weirs) disrupt the processes and dynamics of bedload conveyance. In this study we present an investigation into how coarse sediment is transferred through a low-head dam via the real-time monitoring of bedload transport over a weir in southeast Ireland. Critical discharge values for particle entrainment over the structure were derived from the novel use of a stationary RFID antenna, coupled with continuous recording of water levels and sediment captured downstream using pit-style sediment traps. The stationary RFID antenna was installed along a weir crest using both 'pass-under' and 'pass-over' configurations as a means of detecting the moment bedload tracers moved over the dam crest. Results show that 10% of tracers deployed upstream were detected passing over the weir, while a further 15% that were not detected were recovered downstream. These results indicate bedload material as large as the upstream D-70 (i.e., 90 mm) can move over the structure during infrequent high-flow events. However, thorough searches of the seeded area upstream of the dam also suggest that as many as 43% of the total number may have passed downstream, indicating that tracers moved over the weir after the antenna was damaged during a high-flow event, or were missed due to either particle velocity or signal collision. In addition, 30 of the tracers that remained upstream were shown to have either been buried due to the subsequent influx of sediment entering the reservoir, or were reworked though the surface material. Critical discharge values indicate size-selective trans-port patterns may dominate and a s

关键词： Industrial research  

摘要： As a perception enabling technology of the Internet of Things, RFID can quickly identify target objects. The tag-to-tag collision problem seriously affects the identification performance of the RFID system, which causes the reader to be unable to accurately identify any tag within the specific time. The mainstream anticollision algorithms are limited by the performance bottleneck under the standard framework. In this paper, we analyze the features and merits of three kinds of algorithms in detail and propose a new algorithm architecture for RFID anticollision. Through the extensive experimental results comparison, we prove that the new architecture is effective to improve the performance of DFSA algorithms. Finally, we summarize the future research trends in the RFID anticollision algorithms.

摘要： In the review different RFID-techniques capabilities as a logistics processes monitoring methods of industrial products is discussed in context of product quality parameters continuous control realizing. The both current trends and issues of the systems based on RFID, blockchains, GPS techniques integration as well as opportunity of different sensors implementation aimed to total oil product parameters control are listed. Prospects and current limits of the monitoring systems based on high-speed manufacturing, easy variable chipless printed RFID-tags directly produced on package are shown.

关键词： Radar cross section  

摘要： This research work quantifies the spectral signature’s Quality Factor (QF) and resonating frequencies of a generalised chipless RFID tag over a wide range of dielectric substrates. The tag’s performance is assessed in three configurations. First, a hexagonal shape tag’s Radar Cross Section (RCS) was studied over different dielectric substrates. The various dielectric substrates effects were investigated over the maximum read rang, resonant frequencies and QF. In the second evaluation, the physical geometry of the tag was adjusted to achieve the spectral signatures in 2 to 7 GHz frequency band with high QF. In step three, the optimized tag geometry was manufactured on Fr4, Roger Duroid 5880 and poly(ethylene naphthalate) (PEN) substrates. Denford milling machine for PCB engraving and inkjet printing for silver nanoparticles deposition were used for tags manufacturing. During tag manufacturing, copper and silver were used as conducting materials for RCS backscattering. The tag RCS response was measured by vector network analyzer with bi-static antenna setup. The analysis of different dielectric substrate provides a pathway of designing a novel substrate by using nanomaterials. © 2021, The Authors. All rights reserved.