教学课程资源库 更多>>

关键词： Reed relays  

摘要： There is a need to develop cost-effective and compact solutions for Smart Home monitoring. Existing monitoring systems depend on continuous power sources to support the operation of sensors and electronics modules used therein. In this article, we present three simple battery-free, Radio-Frequency Identification (RFID)-based solutions for real-time monitoring of the orientation of an object using a tilt sensor based on a metallic bead, an entry detection system utilizing a reed switch-based proximity sensor, and a temperature crossing event detection using a thermistor. All sensors are integrated with individual passive RFID tags. The proposed sensing mechanisms were also combined to achieve multi-modal logic sensing operation. Active events (change in position, motion, and temperature) would alter the state of the corresponding flexible RFID sensors to transmit warning signals wirelessly to an RFID reader, realizing a simple RFID-based Smart Home network. The proposed platform has been validated through extensive simulation and actual measurements. © 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

关键词： UHF RFID   traceability system   meat products   code design   safe information chain  

摘要： As a result of the current imperfection of the meat traceability system, there have been numerous food safety events with serious consequences. In this paper, a meat product information traceability system is designed to efficiently prevent such problems. This system develops an identification tag information reader based on ultra-high frequency (UHF) Radio Frequency Identification (RFID). It is compatible with LoRa wireless, USB serial port, RS485, and RJ45 Ethernet connection. Among them, the efficiency analysis of the Q-value algorithm finds that the recognition rate of the system reaches a maximum of about 0.367 when the number of tags n is about the frame length. The multi-tag anti-collision algorithm design based on the algorithm improves the efficiency of information collection in production and distribution links. The traceability code identification scheme is designed to effectively match various links, and the platform of system is built using LabVIEW2014 software, which has five sub-modules including user management, farm management, slaughter management, logistics management, and sales management. The system uses MySQL databases to store traceability information so that users can complete their queries by entering the traceability code on the system platform. The system not only has a low cost and a broad range of applications, but it also realizes the tracking record of meat product traceability information from breeding to selling, completes the function from information collection to information inquiry, and solves the problem of the incomplete traceability information chain. In addition, the system not only enhances the informational transparency of meat products in the product supply chain but also provides information for the regulatory authorities to effectively monitor safety.

关键词： Antenna arrays   Antennas   Dipole antennas   Impedance   Reflection   Slot antennas   Current distribution   Artificial magnetic conductor (AMC)   folded dipolar antenna   gain enhancement   metal mountable   tag  

摘要： In this letter, a UHF-RFID tag antenna with a size of 40 x 40 x 3.2 mm(3) is proposed for metallic objects. It is composed of a modified folded dipolar antenna (MFDA) and an embedded 2 x 2 artificial magnetic conductor (AMC) array with shorting vias. Multiple slots are etched on the MFDA and AMC to increase the current path, where the slots on the MFDA is vertical to that on the AMC so that the currents on the MFDA and AMC do not affect each other. Thus, the slots can be adjusted independently without affecting the resonant feature of the MFDA. Equivalent circuit models are also presented to understand the impedance characteristics. A prototype mounted on a 20 x 20 cm(2) metal plate has been manufactured and measured. It is demonstrated that the proposed tag antenna shows a 3.9 dB gain enhancement comparing with the MFDA without AMC and a maximum gain of -1 dBi at 919 MHz. Moreover, a maximum reading distance of about 14.2 m can be obtained.

关键词： Prototypes   Antennas   Radiofrequency identification   Dipole antennas   Antenna radiation patterns   Metals   UHF antennas   Radio frequency identification (RFID)   ultrahigh frequency (UHF)   ungrounded   wearable antenna  

摘要： A single-layer ungrounded tag antenna is designed for on-body radio frequency identification (RFID) applications in the ultrahigh frequency (UHF) band. The ungrounded tag antenna is designed based on a broadside radiating Huygens source. The electric dipole is generated by the center part of an original dipole, while two orthogonal magnetic dipoles are created by stacking another two metallic strips at the edge of the original dipole. The tag antenna shows good robustness of input matching and radiation efficiency with respect to the human-body effect. Furthermore, the designed tag antenna is also able to work with metallic objects and its resonant frequency is stable around 920 MHz. Finally, three tag prototypes, including the proposed tag antenna, are fabricated and tested. The measured reading range confirms the numerical simulations and demonstrates the robustness of the proposed design with respect to different distances between human-body and tag antenna. The proposed tag provides a reading range of 5.0 m (near-body), 8.0 m (free space), and 16.5 m (200 x 200 mm metallic plate), respectively.

关键词： UVC sterilization   RFID   Airport baggage handling system   COVID-19   Traceability   Baggage tracking  

摘要： In this study, we develop a system to provide information on the sterilization of baggage carts and arriving pas-senger baggage to airport (Hereafter referred as arrival baggage) by using ultraviolet (UV) sterilization and infor-mation communication technology as border quarantine measures at airports. This system sterilizes arrival baggage and baggage carts by UV irradiation, and allows passengers to easily view the sterilization information recognized by radio frequency indentation technology. This is to provide safety and security not only to passen-gers, but also to staff, who may come into direct contact with the arrival baggage, of airport, airline, customs, and soon. In addition, the passengers can be provided with baggage tracking information, such as the current location and estimated delivering time of the baggage. This makes it possible to keep social distancing at baggage claims as an infection prevention. Furthermore, we verify the feasibility of the developed system and identify the issues to be addressed for its practical application through a demonstration of proof of concept at Central Japan Interna-tional Airport. (c) 2022 International Association of Traffic and Safety Sciences. Production and hosting by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://***/licenses/by-nc-nd/4.0/).

关键词： Bayesian   camera traps   capture-recapture   continuous time   Hawkes process   multi-state modelling   RFID   telemetry  

摘要： 1. Recent technological advances have led to a rapid increase in the collection of capture- recapture data in continuous time. Unlike traditional capture- recapture data, the detection times from these technologies are themselves random variables and analysis of these data, therefore, requires models that properly account for stochasticity in both state transitions and detection times.2. Despite the ubiquity of continuously collected capture- recapture data, the mathematical concepts needed to fit continuous -time models remain unfamiliar to many ecologists. In this paper, I provide an introduction to continuous -time models, with a focus on multi -state capture- recapture data.3. After reviewing the basic structure of these models, I describe several variations, including constant parameters, temporal variation in state transition rates and autocorrelation in detections. To aid comprehension, each model is accompanied by code to simulate data and fit the model in Stan.4. Although the models presented in this guide are only a small subset of the variations that are possible to suit the needs of specific datasets or questions, the concepts and code will hopefully serve as a foundation for future analyses, allowing ecologists to develop new and creative approaches to continuous -time modelling.

关键词： Graphene  

摘要： This paper proposes a low-cost and environmental-friendly method for obtaining graphene ink by mechanical exfoliation and dispersion. Based on the graphene ink, graphene film (GF) with a thickness of 10 mu m is prepared, which possesses a high conductivity of 1.2 x 10(5) Sm-1. Raman and scanning electron microscopy results show that graphene flakes have few defects and the surface of the GF is uniform. The bending cycle measurement shows that the mechanical stability of GF is comparable to other graphene films. Ultra-high frequency (UHF) radio frequency identification (RFID) tags based on GF are prepared. The 10 x 100 mm UHF tags provide a reading distance of up to 8.9 m in the frequency range of 860-960 MHz, and the overall reading distance is more than 5 m. The GF-based UHF RFID tags have attractive applications in information exchange, tracking, tracing, and the Internet of Things (IoT).

关键词： artificial intelligence   supply chain   supply chain system   radio frequency identification  

摘要： Radio frequency identification (RFID) is a broad rapidly evolving skill in the past few years. It is characterized by non-contact identification, fast read and write speed, small label size, large data storage capacity, and other technical advantages. RFID technology for goods movement has completely changed the traditional supply chain management, greatly improved the operational efficiency of enterprises, and has become an important method for the development of supply chain logistics. This work mainly studies and analyzes the RFID supply chain, introduces the development and application of RFID supply chain sector technology, and discusses the operation of the supply chain in detail. Then, according to the existing RFID supply chain, a RFID supply chain artificial intelligence (AI) based approach to technology is proposed, and the data analysis of RFID supply chain is introduced in detail. In this work, through the research experiment of AI technology RFID supply chain data analysis, the experimental data show that there are several time-consuming links in the supply chain system. The time consumed in the AI RFID system is 9.9, 3.4, 3.5, and 29.9 min, respectively, while each link in the original system takes 13.4, 4.9, 4.9, and 34.9 min. It can be seen from the above data that the amount of time in each system link of the AI RFID supply chain system is less than that of the original supply chain system, which shortens the entire product passing cycle and greatly improves work efficiency.

关键词： Assistive technology  

摘要： Recent studies have focused on developing advanced assistive devices to help blind or visually impaired people. Navigation is challenging for this community;however, devel- oping a simple yet reliable navigation system is still an unmet need. This study targets the navigation problem and proposes a wearable assistive system. We developed a smart glove and shoe set based on radio-frequency identification technology to assist visually impaired people with navigation and orientation in indoor environments. The system enables the user to find the directions through audio feedback. To evaluate the device’s performance, we designed a simple experimental setup. The proposed system has a simple structure and can be personalized according to the user’s requirements. The results identified that the platform is reliable, power efficient, and accurate enough for indoor navigation. © 2023, CC BY-NC-SA.

关键词： Wearable technology  

摘要： Recent studies have focused on developing advanced assistive devices to help blind or visually impaired people. Navigation is challenging for this community;however, devel- oping a simple yet reliable navigation system is still an unmet need. This study targets the navigation problem and proposes a wearable assistive system. We developed a smart glove and shoe set based on radio-frequency identification technology to assist visually impaired people with navigation and orientation in indoor environments. The system enables the user to find the directions through audio feedback. To evaluate the device's performance, we designed a simple experimental setup. The proposed system has a simple structure and can be personalized according to the user's requirements. The results identified that the platform is reliable, power efficient, and accurate enough for indoor *** Codes J3, J6 © 2023, CC BY-NC-ND.