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关键词： 智能矿山   矿工定位   无线射频识别技术   K-Means   聚类  

摘要： 随着智能矿山技术的发展,越来越多的矿山开始采用自动化设备来取代人力操作,从而提高生产效率和安全性。针对矿工在矿井地下工作时容易遭遇波动信号影响导致定位准确性降低、误差增大等问题,提出了一种基于无线射频识别技术的矿工定位算法。首先,建立了一个基于接收信号强度指标的定位模型,并考虑到信号传播中随机噪声的影响,采用Log-Normal信号传播模型和卡尔曼滤波算法对原始信号进行处理和优化。其次,设计了一种基于K-Means聚类算法的参考点优化方法,来选择合适的参考点,提高定位的准确性和稳定性。试验表明:所提出的算法与现有算法相比,在定位精度和鲁棒性方面均有显著提升。该方法不仅可以提高矿工工作安全性和效率,还可以为矿山安全监管和管理提供更精确和有效的手段。

关键词： RFID技术   危化品管理柜   安全管控系统  

摘要： 为有效应对不同类型危化品的管理,防止事故发生,文章综合物联网技术为危化品有效监管提供全新技术,即开发基于RFID技术的危化品管理柜,其具有一定的安全管控系统,并能使危化品管理具有精准性。因此,依托上位机工控软件和下位机执行硬件,文章从可行性和经济型角度引入了无接触式的、能够实现自动识别的超高频RFID技术,组合各模块构建开关动作执行单元,形成上位机下位机的通信协议和软件开发,从而实现危化品无需人员近距离操作即可感知信息并实现管控的目的,降低管控人员的人身安全风险。

关键词： 项目管理   范围约束   图书馆RFID   信息系统集成项目   高技术   特殊性  

摘要： 信息系统集成项目以满足客户和用户的需求为根本出发点,拥有高技术与技术的集成、强调沟通等多方面的显著特点[1]。此项目管理有一套成熟的方法来推进项目,在一定时间、成本、质量要求下实现项目目标[2]。图书馆RFID项目有其特殊性,将信息系统集成项目管理方法应用在项目建设中,能够促进项目在时间、成本、范围约束下高质量地顺利完成。本文将从甲方的视角,考虑RFID项目建设的问题。

摘要： AIM: To evaluate the safety and feasibility of using radiofrequency identification (RFID) tags for the localisation of axillary nodes prior to targeted excision in a National Health Service (NHS) breast unit. MATERIALS AND METHODS: Retrospective data collection was carried out to analyse the first 75 cases of RFID-targeted axillary nodes inserted between 12 June 2019 and 27 October 2022, during which an overall total of 1,296 breast and axillary tags were deployed in 1,120 ***: Of the 75 axillary tags, 70 (93%) had a primary breast cancer and five (7%) had no known breast cancer but had an abnormal node targeted for diagnostic excision. Of the 70 with breast cancer, 20 (29%) underwent neoadjuvant chemotherapy (NAC) including one neo-adjuvant endocrine therapy. Localisations were performed an average of 11 days before surgery (median 6, range 1-95;n1/475). Patients undergoing NAC had their tags inserted after completing treatment due to the artefact caused by the tags on magnetic resonance imaging (MRI). Tag deployment had a 100% success rate, with 62 tags (83%) lying within the node and 13 tags (17%) lying directly adjacent to the node, either in direct contact (nine of 13), or a maximum of 8 mm from the target (four of 13). All tags and their respective nodes were excised successfully at surgery with no significant complications. There were four cases of tag dislodgement during excision, but overall, this did not compromise retrieval of the tag or the ***: The use of RFID tags for the preoperative localisation of axillary nodes is safe and feasible.& COPY;2023 Published by Elsevier Ltd on behalf of The Royal College of Radiologists.

关键词： chipless sensors   radio frequency identification devices   strain sensors   structural health monitoring   wireless strain monitoring  

摘要： Structural health monitoring (SHM) is crucial for ensuring operational safety in applications like pipelines, tanks, aircraft, ships, and vehicles. Traditional embedded sensors have limitations due to expense and potential structural damage. A novel technology using radio frequency identification devices (RFID) offers wireless transmission of highly sensitive strain measurement data. The system features a thin, flexible sensor based on an inductance-capacitance (LC) circuit with a parallel-plate capacitance sensing unit. By incorporating tailored cracks in the capacitor electrodes, the sensor's capacitor electrodes become highly piezoresistive, modifying electromagnetic wave penetration. This unconventional change in capacitance shifts the resonance frequency, resulting in a wireless strain sensor with a gauge factor of 50 for strains under 1%. The frequency shift is passively detected through an external readout system using simple frequency sweeping. This wire-free, power-free design allows easy integration into composites without compromising structural integrity. Experimental results demonstrate the cracked wireless strain sensor's ability to detect small strains within composites. This technology offers a cost-effective, non-destructive solution for accurate structural health monitoring.

关键词： Radio frequency identification (RFID)  

摘要： Just a decade ago, from the moment a valuable shipment left the supplier until it was added to your inventory, it was all but impossible to know exactly where it was and what state it was in. Today, such lack of visibility is increasingly considered poor practice, wasteful or downright irresponsible and multiple technologies, including wireless and radio frequency identification (RFID) are being applied to make industrial applications.

关键词： Backscattering   radio frequency identification (RFID)   reflection amplifier (RA)  

摘要： An ultrahigh-frequency (UHF) radio frequency identification (RFID) tag structure which includes both received signal demodulation and reflected signal amplification abilities for standard compatibility is described in this letter. To let demodulation and reflected signal amplification features coexist, a simple RF switch is used to separate the reception and reflection signal paths, and a reflection amplifier (RA) is connected to one of the two RF switch paths to realize the amplified reflection state. The RF switch can guarantee good impedance matching under reception/reflection conditions;moreover, by selecting it judiciously, i.e., with a low insertion loss, it is possible to simultaneously achieve high tag sensitivity and reflection amplification. Measurement on a tag prototype has revealed a maximum read range of 96 m (with a tag sensitivity of $-$ 42 dBm) and an average power consumption of 1.134 mW.

关键词： radio frequency identification   backscatter   motion sensing   support vector machine  

摘要： With the advent of the 5G era, radio frequency identification (RFID) has been widely applied in various fields as one of the key technologies for the Internet of Things (IoT) to realize the Internet of Everything (IoE). In recent years, RFID-based motion sensing has emerged as an important research area with great potential for development. In this paper, an RFID backscatter sport motion sensing scheme is proposed, which effectively solves the multi-classification problem by using the received signal strength (RSS) of the backscattered RFID and the error correcting output coding (ECOC)-based support vector machine (SVM). We conduct extensive experiments to validate the effectiveness of the proposed scheme, in which the signal intensities of different types of action poses are collected and the SVM is used as the classification algorithm to achieve high classification accuracies.

关键词： chipless RFID   analytical model   clutter   simulation   measurement   RCS-based cross-polarized tag  

摘要： Chipless radio frequency identification (RFID) technology is expected to replace barcode technology due to its ability to read in non-line-of-sight (NLOS) situations, long reading range, and low cost. Currently, there is extensive research being conducted on frequency-coded (FC) co-polarized radar cross-section (RCS)-based tags, which are widely used. However, detecting co-polarized chipless RFID tags in cluttered environments is still a challenge, as confirmed by measuring two co-polarized tags in front of a perfect metal reflector (30.5cmx22.5cm). To address this challenge, a realistic mathematical model for a chipless RFID system has been developed that takes into account the characteristics of the reader and the tag, as well as reflections from cluttered objects. This extensive mathematical model developed for linear chipless RFID systems in clutter scenarios holds the potential to greatly assist researchers in their exploration of RCS-based tags. By relying solely on simulations, this model provides a tool to effectively analyze and understand RCS-based tags, ultimately simplifying the process of generating more authentic tag designs. This model has been simulated and verified with measurement results by placing a single flat metal reflector behind two co-polarized one-bit designs: a dipole array tag and a square patch tag. The results showed that the interfering signal completely overlaps the ID of the co-polarized tag, severely limiting its detectability. To solve this issue, the proposed solution involves reading the tag in cross-polarization mode by etching a diagonal slot in the square patch tag. This proposed tag provides high immunity to the environment and can be detected in front of both dielectric and metallic objects.

关键词： IoT   Wearable sensors   Healthcare   Pervasive   Body Sensor Network (BSN)   RFID  

摘要： PurposeThe power of the Internet has impacted various industries, especially the healthcare industry. With the rapid population growth and advancement of various sensor technologies and smart devices, the demand for quality healthcare services has increased in the past few years. At the same time, Internet of Things (IoT) technology makes intelligent objects communicate with each other by connecting all the objects without human intervention. IoT facilitated services and technologies in healthcare to provide low-cost and efficient service delivery to patients and consumers. It reduces the patient's hospital stay time and efficient information exchange by providing cost-effective healthcare services. This systematic review analyzes different technologies, core applications, datasets, algorithms, challenges, and limitations of IoT in the healthcare *** search is performed to review IoT healthcare-enabling technologies, algorithms, applications, and IoT-centric architectures. Search has been conducted over popular databases like Springer, Elsevier, and IEEE Xplore. We have downloaded around 544 research papers, out of which we have selected only 116 based on our *** identified different challenges in healthcare IoT applications as security and privacy, scalability, high cost, energy efficiency, quality of service, network architecture, mobility, and interoperability. However, data security and privacy issues are significant challenges in the healthcare sector as they deal with patients' confidential information. Also, we proposed a novel architecture that covers most IoT healthcare requirements. IoT healthcare applications are also detailed. In addition, it reviews most of the healthcare datasets and the utilized *** on the reviewed articles in this paper, it is has been concluded that IoT devices are beneficial in the healthcare applications, regardless of their limitations in terms of energy, processing, and