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关键词： Metals   Antennas   Interference   RFID tags   Power generation   Surface impedance   Sensitivity   Backscatter   Attenuation   Inventory management   Compact storage environment   metal interference   mobile scanning   RFID   range detection  

摘要： Radio Frequency Identification (RFID) technology has revolutionized inventory management, enhancing tracking efficiency across industries. However, its reliability is significantly compromised in metal-rich environments due to wave reflection, absorption, and signal obstruction, leading to missed reads, reduced detection range, and interference. This study presents a systematic investigation into the detection performance of High Frequency (HF) RFID-tagged inventories stored within confined metallic storage facilities. Specifically, this research examines how metallic environments create RFID interference by altering electromagnetic wave propagation, causing signal distortions, multi-path effects, and unpredictable attenuation patterns. Through simulation and experimentation, we analyze the impact of metallic shelves on RFID performance and explore strategic mitigation techniques, including optimized tag-to-reader placement, antenna configurations, and adaptive scanning methodologies. Our findings reveal unique interference characteristics in different metal scenarios, uncover detection patterns, and form the basis for proposing adaptive methods to enhance RFID readability. The study provides novel insights into optimizing RFID detection in challenging metallic environments and lays the groundwork for future advancements in RFID-based inventory tracking systems.

关键词： Antenna arrays   Radiofrequency identification   Phased arrays   Pose estimation   Antennas   Accuracy   RF signals   Impedance   Arrays   Mutual coupling   Data fusion   hyperbolic positioning   multiple signal classification (MUSIC)   radio frequency identification (RFID)   RFID positioning  

摘要： Radio frequency identification (RFID) shows great potential for determining the orientation and position of objects in production line, which is critical for industrial automation and intelligence. However, the state-of-the-art schemes face challenges in decoupling the orientation- and position-induced phase from the radio frequency (RF) signal. This investigation presents a novel simple RFID array-based solution with a phase-pose model to simultaneously determine the orientation and position of moving objects with negligible mutual coupling. The main contributions include 1) a phase-orientation model to determine the orientation-induced phase differences between RFIDs in a tag array, which also extends the range of multiple signal classification (MUSIC)-based orientation measurement;2) a novel phase-position model to decouple the position-induced phase differences between a tag and antennas from the RFID interrogation variables;and 3) fusion of the orientation and position data determined by hyperbolic positioning and MUSIC to improve the accuracy of pose estimation by reducing their mutual coupling. An experimental setup is established to verify the effectiveness of the presented techniques. The average orientation and position errors are 1.63 degrees and 3.98 cm, which is promising compared to the peer studies.

关键词： RFID   Construction industry   Digital Twin   Building Information Modeling   Latent Semantic Analysis  

摘要： RFID technology is becoming increasingly popular in various industries due to its simplicity, affordability, and adaptability. However, its integration into the construction industry, particularly within the Digital Twin framework, remains limited. This study reviews current research and case studies on RFID in construction, focusing on its potential combination with Digital Twins. It examines the integration of RFID with BIM, sensors and other techniques to monitor building conditions. Using Latent Semantic Analysis, the study identifies key trends and patterns in the literature, revealing a predominant focus on the standalone use of RFID for localisation and tracking, with limited integration into other technologies. The findings highlight persistent barriers to wider adoption and underscore the need for further research to overcome these challenges.

关键词： Barriers   Construction industry   RFID   Strategies   Technology  

摘要： PurposeThe implementation of Radio Frequency Identification (RFID) technology has been initiated by many countries for construction industry applications due to its peculiar benefits. However, the successful implementation of the RFID technology has been hindered due to numerous barriers that are specific to the construction sector. Therefore, this study aims to propose strategies to overcome barriers that constitute significant obstructions to RFID adoption in the construction ***/methodology/approachThis study adopted an exploratory mixed-method approach to attain the research aim. The survey was followed by 11 individual interviews conducted with experts and the findings were analysed using content analysis. The questionnaire survey that was carried out as a part of the research had a response rate of 80% and collected data were analysed using Relative Importance Index. To ensure the robustness of the findings, expert validation interviews were conducted to cross-verify and provide deeper insights into the *** high implementation cost of RFID technology was identified as the most significant barrier when implementing RFID technology. Subsequently, strategies were proposed to implement RFID technology based on identified highly significant barriers of RFID. Implementing RFID technology in small-scale construction projects, increasing the collaboration among the countries that have implemented RFID technology and encouraging investors to invest in RFID-implemented projects were mainly proposed to improve the applications of RFID technology in the construction ***/valueThis study paves the way to identify the RFID technology concept and its barriers and strategies to effectively implement RFID technology in the construction industry. Findings are helpful to the construction industry practitioners to obtain the optimum benefit from the implementation of RFID technology.

关键词： RFID   智慧医院   SSA   WSN  

摘要： 随着社会经济发展，人们对高质量医疗服务的需求持续提高。为了解决医院部门之间信息共享存在实时性差等问题。本文提出了射频识别技术，并引入改进麻雀搜索算法以及无线传感网络对其进行改进，构建了改进射频识别模型。随后，构建了基于该模型的智慧医院架构。将改进射频识别模型与其他模型进行覆盖率对比实验，结果表明该模型的覆盖率为100%，显著优于对比模型。此外，将智慧医院架构进行应用效果分析，结果表明该架构缩短了病人医疗时间。上述结果表明，本文提出的改进射频识别模型和智慧医院架构能有效提高医院服务质量。

关键词： IoT   RFID   Low-cost   Authentication   Ultralightweight protocols   Scyther   FPGA   UDAP  

摘要： The emergence of radio frequency identification (RFID) technology in the era of the Internet of Things represents a remarkable advancement, but also brings its own set of challenges. Low-cost RFID tags, key elements of this ecosystem, face major security and privacy issues due to their limited computational and memory capacities. To overcome these issues, we focused on the design of an ultralightweight RFID authentication protocol named UDAP, which incorporates simplified cryptographic techniques such as dot product, XOR, and left rotation. This approach aims to enhance the levels of security and confidentiality while concurrently minimizing the impact on the tag's limited resources. Both informal and formal analysis of our protocol, including the use of the Scyther simulation tool, has demonstrated its effectiveness in countering the most known security attacks. To measure the efficiency of our proposed protocol, an Field-Programmable Gate Array (FPGA) implementation was carried out, allowing for precise evaluation of the resource consumption of the key function used in our protocol. This implementation has shown that our protocol is not only secure but also utilizes minimal resource consumption, making it particularly suitable for resource constrained RFID tags.

关键词： 物联网   汽车实训室   RFID   设备管理系统  

摘要： 针对传统汽车实训室设备管理系统系统错误率高、定位误差过大等问题，设计基于物联网的汽车实训室设备管理系统。首先，设计汽车实训室设备管理系统总体框架;其次，通过物联网前端感知设备——RFID 装置和电流传感器分别采集设备信息和电流信息;最后，通过物联网并发网络将信息传递到物联网终端服务器当中，利用服务器中的功能模块实现实训室资产在线管理、设备追踪定位以及设备状态监测。实验结果表明:系统应用下定位误差均在10 cm范围内，内存资源保持在5%以下，资源消耗缩小。当并发量在300 QPS下，系统错误率仅5.27%，系统运行状况极佳，系统性能有效提升。

关键词： 光伏巡检   巡检点   RFID   QR-Code   位姿校正  

摘要： 由于光伏发电站视野开阔、场地空旷，光伏阵列环境特征稀疏，相似性高，光伏巡检机器人巡检定位和导航过程中容易因为特征近似出现定位劣化问题。根据光伏电站特性和巡检需求特性，提出一种使用RFID信标和QR-Code标牌为光伏巡检机器人提供巡检点定位与姿态校正信号，实现发生定位劣化后位姿准确校正的方法。并通过巡检点预设巡检采集朝向参数校正巡检台上的设备朝向，调整巡检拍摄视场和角度，为光伏巡检自动识别提供更加有效且易用的巡检数据，在持续的位姿校正过程中保障巡检覆盖率。通过Gazebo仿真测试，对运行的光伏巡检机器人模拟产生定位劣化情况，测试结果表明当发生定位劣化后，光伏巡检机器人可以通过该位姿校正方法，实现位姿校正。通过重复性实验，测得校正成功率超过95%，验证了该方法的有效性，为光伏巡检机器人应用提供了参考。

关键词： RFID   PIT tags   Biotelemetry   Testing protocols  

摘要： BackgroundPassive integrated transponder (PIT) tags are widely used to track animal movements and survival. Rigorous testing protocols are necessary to ensure reliability in PIT tag performance and resulting data across various environmental conditions. This study aimed to document a comprehensive testing framework for PIT tags as a model for the broader biotelemetry community and to showcase how independent evaluations can validate the performance of new PIT tag offerings against established regional performance criteria. Independent testing and adherence to regionally applied standards were key components of this *** Voda IQ HQ12, HQ10, HQ9, and HQ8 PIT tags were evaluated through a series of independent tests, including assessment of physical dimensions, electrical parameter testing, and proximity evaluations. The HQ10 and HQ9 tags passed all performance criteria, while the HQ12 tag excelled in most areas but exceeded the region's maximum weight threshold by 0.0022g. Despite this, the HQ12 tag showed strong detection efficiency and read range, particularly in challenging environments like the Bonneville Corner Collector. The HQ8 tags, while showing a more limited read range, offer advantages in applications requiring minimal tag burden. Independent testing played a crucial role in validating the performance of these tags under established *** study underscores the importance of rigorous testing for PIT tags to ensure reliability across diverse environmental conditions. Independent evaluations like these not only inform stakeholders, but also encourage the adoption of new technologies and vendors. The methods and results presented here offer a valuable model for testing new biotelemetry technologies, applicable across different species, ecosystems, and monitoring programs worldwide.

关键词： anti-collision   RFID   TDMA   DFSA   CA-CFAR  

摘要： Radio Frequency Identification (RFID) is considered a key element of the Internet of Things (IoT). It enables objects to be identified and tracked using radio waves. In RFID systems, several tags may be present within the range of the reader, leading to collisions and interference between signals that reduce system performance. Several anti-collision solutions have been proposed to solve this problem based on TDMA (Time-Division Multiple Access) technique, such as the ALOHA, Slotted ALOHA and Dynamic Framed Slotted ALOHA (DFSA) protocols. In this paper, we propose to improve TDMA anti-collision protocols based on the Cell Averaging Constant False Alarm Rate (CA-CFAR) scheme. The CA-CFAR technique is introduced to estimate the number of tags in the physical layer so that the reader can adjust its transmission parameters accordingly and avoid collisions. The obtained results show that this technique achieves good results in terms of system efficiency and the number of required slots to identify all the tags of the system.