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关键词： Competing supply chains   RFID   Inventory misplacement problems   Game theory   Competition modes  

摘要： We investigate the RFID adoption and chain structure (i.e., integrated or decentralized) decisions in two supply chains under two competition modes (i.e., Bertrand or Cournot competition). Each chain consists of a manufacturer and an exclusive retailer, who suffers from inventory misplacement problem. Two supply chains first simultaneously choose chain structure and then decide whether to invest in RFID technology. We develop an analytical model to derive the equilibrium outcomes, then further analyze the interactions between RFID adoption and chain structure under two competition modes. We find that in equilibrium, both chains prefer to choose integration under Cournot competition, while they might be better off from decentralization under Bertrand competition. Moreover, there may exist a prisoner's dilemma for the equilibrium strategies on RFID adoption and chain structure. Specifically, when both chains adopt RFID, the prisoner's dilemma occurs if the competition is fierce;when only one chain adopts RFID, the chain who forgoes RFID adoption is easier to trap into the prisoner's dilemma;when no chain adopts RFID, a high misplacement rate may aggravate the prisoner's dilemma if the competition is weak, and the supply chain members under Cournot competition may escape such dilemma if the competition is fierce. In addition, competition mode doesn't affect the optimal strategies for RFID adoption and chain structure. Further, in the case where the manufacturer affords a higher production cost, Cournot competition is more conducive to coordinate chains when competition is weak or relatively fierce, whereas Bertrand competition will be more effective when competition is moderate or very fierce.

关键词： Authentication   RF signals   Doppler shift   Feature extraction   Legged locomotion   Sensors   Behavioral sciences   Environment-independent   gait feature   RFID   user authentication  

摘要： Gait-based user authentication schemes have been widely explored because of their ability of non-invasive sensing and avoid replay attacks. However, existing gait-based user authentication methods are environment-dependent. In this paper, we present an environment-independent gait-based user authentication system, RFPass, which can identify different individuals leveraging RFID signals. Specifically, we find that Doppler shift of RF signals can describe environment-independent gait features for different individuals. In RFPass, when a user walks through the RFPass system, RF signals are first collected by a deployed RFID tag array. Then, RFPass removes environmental interference from the collected RF signals through a proposed Multipath Direction of arrival (DoA) Signal Select (MDSS) algorithm, and further constructs the environment-independent gait profile. Afterwards, environment-independent gait features are extracted from the constructed gait profile by a proposed CNN-RNN model. Based on the extracted gait features, a hierarchical classifier is trained for user authentication and spoofer detection. Extensive experiments in different real environments demonstrate that RFPass can achieve environment-independent gait-based user authentication.

关键词： Low-cost bandpass filter   FR4 Epoxy   WLAN   Bluetooth   RFID   ISM band  

摘要： In recent years, microwave filtering technologies have known great advancement and wide employment in wireless communication systems, necessitating the development of miniaturization techniques to respect the size limitation in wireless communication devices and reduce the cost, in order to satisfy the consumer and be more competitive. Accordingly, the design of a microwave filter is chosen based on its electrical performance, size, and manufacturing price. Therefore, it is necessary to make a good compromise between the mentioned criteria to satisfy the industrial requirements. This paper proposes a small and inexpensive bandpass filter (BPF), where the proposed structure is carefully constructed over a low-price FR4 Epoxy substrate with a full dimension of (17.6 x 9 x 1.6) mm3. The proposed filter offers good electrical performance in terms of reflection coefficient (S11), insertion loss (S21), Voltage Standing Wave Ratio (VSWR), and selectivity. A filter prototype is fabricated and tested to affirm the simulation results. Consequently, the measured results show a good agreement with the simulation, proving the suitability of the proposed filter for different wireless applications, including WLAN, Bluetooth, ZigBee, RFID, and ISM bands.

关键词： RFID   Blockchain technology   Barrier analysis   DEMATEL   Public distribution systems   India  

摘要： PurposeAs an emerging technology, Radio Frequency IDentification (RFID) and blockchain have the potential to disrupt many areas of business and social structure. However, it is loaded with significant technical, social, legal, financial and ethical complications that bring difficulty in its widespread use within the public distribution system (PDS). This research aims to analyze the barriers to integrated RFID and blockchain adoption in developing countries' PDS. Furthermore, this study also aims to validate the proposed framework against the Indian ***/methodology/approachThe proposed framework consists of 10 potential barriers to integrated RFID and blockchain adoption. To identify the barriers, this study referred to the extant literature followed by consultations with domain experts. This study prepared the DEMATEL-based questionnaires, collected the data from four domain experts and analyzed them using an integrated Grey-DEMATEL *** obtained results provide a precise list of barriers and the correlations among them. From the results, it is concluded that the unavailability of a skilled workforce at affordable cost, lack of knowledge about privacy level and unclear return on investment and benefits are the most critical blockchain adoption barriers in the context of Indian ***/valueThis research proposes a framework consisting of 10 integrated RFID and blockchain adoption barriers in relation to Indian PDS. It also proposes a method for analyzing causal interrelationships between the barriers while allowing for data input from domain experts. Consequently, the framework is capable of coping with experts' biases and data scarcity.

关键词： Microfluidics  

摘要： Microfluidic has been an enabling technology for over a decade, particularly in the field of medical and wearable devices, allowing for the manipulation of small amounts of fluid in confined spaces. Micro-channels can also be used for wireless sensing thanks to the variations in antenna properties when the fluid flows near it. However, up to now, microfluidic channels and sensing antennas have always been designed separately;instead, since the liquid flow and the antenna geometry both contribute to the overall performance, they should be considered simultaneously when optimizing the antenna-microfluidic system. In this paper, the joint design of the antenna and microfluidic channels is investigated for liquid quantification. Self-tuning RFID microchips are exploited to minimize communication degradation due to the increase of lossy liquid amount over the sensing antenna while digitalizing the impedance mismatch itself. To experimentally corroborate the joint design technique, two different geometries are obtained and prototyped starting from a given antenna-microfluidic layout by setting different goals for an optimization function. The two flexible RFID prototypes returned performance in agreement with the simulated ones, achieving a maximum sensitivity of about 20 units of the digital metric per milligram increase of water. © 2024, CC BY.

摘要： Currently, there are still very many Kindergartens whose security in checking the identity of the introduction or pick-up is still manual, some even do not do identity checks. This is felt to be less able to overcome parental concerns about child crime which is increasingly happening. We need a computer-based tool to increase child safety when in delivery and pick-up by knowing who the delivery person and pick-up are. If the child is delivered or picked up, then the delivery person or pick-up only needs to scan the Student Card by waiting for the successful display on the LCD and also the web display so that the delivery or pick-up data is stored in the database, then the child will be called automatically at the time of pick-up and the parents receive an SMS notification when the child is picked up. Based on the results of the overall design of a student security system using RFID that has been carried out, the results of the design that has been tested overall have been running and active as expected by the author with a success percentage of 94%.

关键词： Digital supply chain (DSC)   internet of things   RFID   5G   3D printing   big data   blockchain   digital twins   intelligent autonomous vehicles  

摘要： This paper systematically reviews literature related with digital supply chains (DSC) and investigates the application status and development trend of different digital technologies in supply chain management. The review is conducted from the perspective of seven key digital supply chain technologies, i.e. Internet of Things (IoT) & Radio Frequency Identification (RFID), 5th Generation Mobile Communication Technology (5G), 3D Printing, Big data (BD), Blockchain, Digital Twins (DT), and Intelligent autonomous vehicles (IAVs). It highlights the main limitations and opportunities of the various DSC technologies, provides an overview of prior studies, and identifies knowledge gaps by outlining the advantages, weaknesses and restrictions of individual technology. The paper also aims at providing a development framework as a roadmap for the match of different digital technologies with different strategic goals.

关键词： Radiofrequency identification   Passive RFID tags   Antennas   Internet of Things   Integrated circuits   Monitoring   Radio frequency   Electric energy   Internet of Things (IoT)   radio frequency identification (RFID)   sensor tag  

摘要： In this article, a novel ultrahigh-frequency (UHF) radio frequency identification (RFID) passive tag with a current sensor is presented. The device can be used to detect electrical current flowing through the power cord of the surveyed equipment, allowing for its switched on state to be established and, for instance, its energy consumption to be computed. The identification of the tag by the system makes it possible, among other things, to individually monitor the energy consumed by the target equipment, both in domestic and industrial environments. The solution presented here is ideally placed to be used in the Internet of Things (IoT) context.

关键词： 垃圾分类   智能垃圾箱   RFID   ZigBee  

摘要： 在当今空前重视环保的背景下,垃圾分类具有十分重大的实践意义,如何高效地对垃圾进行分类已经成为人们追求的目标。本文通过RFID射频识别技术、ZigBee无线通信技术开发一种综合识别垃圾袋标签、智能称重、温度测量和线上积分兑换的多功能智能垃圾分类系统。该系统旨在实现居民从领取垃圾袋并自行分类垃圾,到识别垃圾袋标签并准确无误投放垃圾,再到获得积分奖励并兑换奖品的完整流程,充分调动每个住户垃圾分类的积极性,增强住户的垃圾分类意识。