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关键词： IoT   Infection control   Aged care living residences   RSSI   RFID   Location fingerprinting  

摘要： In recent years, aged care living has drawn attention because of population aging and extension of average lifespan. Moreover, the rapid development of information communication technology and the internet of things lay the foundation for the application of sensor networks and cloud computing on medical care. Most elderly often suffer from chronic diseases due to weaker immunity causing a higher infection risk. The problem of infection controlling is an essential issue for residences living in aged care facilities. In the past, for infection control, medical personnel use the manual method of tracking, investigating, and interviewing patients to obtain patient contact list. This method cannot identify residents who have a high risk of infection, distinguish the distance between patients and other residents, and evaluate the risk of infection. To isolate all the residents who contact patients is the only solution that does not only cause repulsion of other residents but also waste medical resources. This study proposes a visual infection control positioning system for aged care facilities using the RFID (Radio Frequency Identification) technology and IoT technology. It can calculate the distance between users and reduce the positioning error. The system combines location fingerprinting with the K-nearest neighbor algorithm to fix errors caused by signal fluctuation of RFID to improve the positioning accuracy. The system records the indoor movement path of the residents in a real-time manner through the positioning function. When infectious diseases spread in aged care living residences, to help medical personnel, the system can screen out residents with a high risk of infection who closely contact with patients according to the movement path of the patients and other residents, and visually display them. For some infectious diseases, residents who live together with patients may be infected even if they do not have contact with the patients closely. This system can a

关键词： Chipless RFID   Data encoding circuit   IoT (Internet of Things)   Radio frequency identification (RFID)   Radio cross section (RCS)  

摘要： This paper reports a novel, fully passive chipless RFID tag covering a minuscule profile of 16 x 15 mm(2) emanating data capacity of 15 bits. The ON-OFF keying phenomenon has been utilized for data encoding in the compact structure. Moreover, the tag renders 1:1 slot-to-bit correspondence while incorporating loop-based pentagonal-shaped geometry as a resonating structure. The proposed chipless RFID tag offers an appreciable bit density of 6.25 bits/cm(2) in a spectral range of 4.8 to 18.8 GHz. The electromagnetic performance of the design is scrutinized over the ungrounded laminates, i.e., Rogers RT/duroid (R) 5880 and Rogers RT/duroid (R) 5870. The multi-resonant signature exhibits fair agreement between measured and computed results. The reported work credits its potential and application in contactless tracking and identification.

关键词： Microcontroller   Obstacle Sensor   Radio Frequency Identification (RFID)   Security locker   Security System  

摘要： In this study, an attempt has been taken to design and prototype a cost effective security locker system to ensure the safety of the valuable objects and belongings of people in public places. To combat unfortunate cases of thefts or loses at public places, this paper aims to represent a Radio Frequency Identification (RFID) based security locker system that can protect the valuable belongings in individual boxes of the system. A microcontroller is the heart of the system, with a stored database. An RFID reader reads information from RFID tags to match with the stored data in the microcontroller to allow access. Users of this system can use the RFID tags to lock their belongings inside the locker and take them out after completing their respective businesses in the public places. The proposed security system can be a major step in preventing valuable item stealth or losses in public places as this system has been designed in such a way that only the authorized owner of the locker or the admin of the system can access the locker. © 2021, Bharati Vidyapeeth's Institute of Computer Applications and Management.

关键词： Blockchain   Smart Contract   UHF-RFID   Smart Cargo Management   Smart Applications  

摘要： Today, the continuous growth of electronic commerce volume increases the importance of point-to-point shipment transportation. For this reason, it is extremely important that shipment management systems provide effective, efficient and fast service. A study of the literature shows that the improvements made in the field of transportation have been generally aimed at global logistics networks. In this study, unlike the existing literature, a blockchain-based solution is developed for local cargo networks. With this approach using Ultra High Radio Frequency (UHF-RFID), Internet of Things (IoT) sensors and blockchain-based smart contracts, a fast shipping management architecture that ensures security between the parties is provided. In this context, an automatic payment and approval mechanism is established between the parties using ethereum-based smart contracts. In addition, shipments equipped with RFID tags are automatically tracked and traceable using UHF-RFID antennas. The IoT data collected in the study are stored on a cloud-based server, which is a cost-effective solution. Smart contracts that enable communication between the parties are written in the Solidity language using the Ganache, Truffle and Metamask platforms. It was observed that the integration between the technologies is ensured and the communication between the parties works successfully in the test processes.

关键词： Patch antenna   RFID antenna   wideband antenna  

摘要： It is known that for a microstrip antenna, if the height of the antenna is strictly limited, then the bandwidth is narrow. A way to solve this problem is to combine two modes. However, for almost all the two-mode resonant patch antennas reported, the height of the antenna conflicts with the frequency ratio of the two modes. The smaller the frequency ratio is, the higher the antenna. In this paper, a detailed mode analysis is performed, and a comprehensive mode shift design method is established. A dual resonant patch antenna with any frequency ratio can be designed. Guided by this method, a low-profile wideband patch antenna with a size of only 0.6 lambda 0 x 0.6 lambda 0 x 0.05 lambda 0 for the universal RFID reader (840-960 MHz) is designed. The simulated and measured results show that a low-profile is achieved for universal RFID reader antennas.

关键词： Radiofrequency identification   Impedance   Sensors   Frequency measurement   Internet of Things   Tin   Integrated circuits   Differential measurement technique   multitag system   sensors   ultra-high-frequency radio-frequency-identification (UHF RFID) sensing technology  

摘要： Ultra-high-frequency radio-frequency-identification (UHF RFID)-based sensing technology with antenna-integrated sensor tags offers a cost-effective solution for Internet of Things (IoT) applications. A multidimensional differential measurement technique for eliminating the effect of the measurement setup, such as unknown mutual distance and orientation between the read/write device (RWD) and sensor tags, and line-of-sight obstruction, on acquiring information from multiple sensor tags simultaneously is proposed. The concept is based on 1) using a channel hopping mechanism to acquire multidimensional data sets and 2) conducting a dissimilarity analysis between offline and online data sets to extract sensor information. The differential measurement, which is activated by the channel hopping mechanism, mitigates the impact of the measurement setup, making the pattern of the multidimensional data sets tightly relate to the sensing state. A sensor tag for measuring the water-filling level of polyvinyl chloride (PVC) pipes is designed and fabricated. Experiments show that the proposed method can accurately acquire information from three sensor tags simultaneously under different measurement setups. The performances using data sets of different dimensions are compared. Results reveal that using low-dimensional data sets can still be capable of getting accurate information from the sensor tags, implying that the acquisition time can be reduced.

关键词： Errors  

摘要： RFID as an important component technology of IoT faces important security risks while being rapidly applied, among which the discovery of unauthorized readers in space is crucial. There are some researches proposed the unauthorized reader detection algorithm based on commercial off the shell(COTS) devices, but these detection algorithms are often easily affected by moving objects blocking interference in space, causing false alarms. We propose a new method of eliminating moving object interference, which can reduce the system false alarm rate to less than 7.9% by experimental testing. © 2022, CC BY.

关键词： Sensors   Sensor phenomena and characterization   Temperature sensors   Impedance   Sensor systems   Radio frequency   Intelligent sensors   Chipless sensor   wearable   RCS   conductivity   IoT  

摘要： Radio frequency identification (RFID) is a quickly growing innovative wireless data capturing technology for automatic identification, product tracing, security investigation, automatic toll fee, vehicle tracking, and e-Health. Wearable sensing technology and on-body structures have achieved pervasive responses due to their fabulous potential in the Internet of Things (IoT), healthcare, and smart homes. Inexpensive chipless RFID tags for on-body sensing are the upcoming research for such wearable devices. Its sensing skill offers the unified real-time monitoring of vital signs. This paper reviews various chipless passive RFID tag sensors for wearable applications. The main goal of this research work is to study the basics of chipless RFID sensors and their working principles. Further, chipped RFID sensors are very costly for mass implementation. Hence, chipless tag sensors have grown into a cost-effective and maintenance-free substitute, fulfilling the requirements of the society for the emergent technologies, where lots of these sensors can be used. Understanding the importance in emerging applications, essential materials needed for different sensors, basic circuit models for chipped and chipless sensors, and challenges with limitation of recent chipless RFID sensors are also discussed in this article.

关键词： Computation-communication tradeoffs   missing item event detection   multitagged item   radio-frequency identification (RFID)  

摘要： Missing item event detection is one of the most important radio-frequency identification (RFID)-enabled functions. Yet it is largely unaddressed how to fast and reliably detect missing item event in multitagged RFID systems where multiple tags are tagged on one item. The canonical methods can only solve tag-level detection problem where each item is associated with one tag, and applying them to detect the missing multitagged items would falsely alarm and is time inefficient. To bridge the gap, this article formulates and analyzes the missing multitagged item detection problem. Our key idea is to search the proper seeds so that the reader only needs to probe a subset of the tags each being selected from different items instead of the entire tag set for the missing item detection. By employing the computation-communication tradeoffs, we design two protocols named (MID)-I-2 and (MID)-I-2+ that classifies the tags before the segmentation compared to the former to improve time efficiency. With the derived optimum parameters, our protocols can achieve up to 4x performance gain in terms of time efficiency compared with the state-of-the-art solution.

关键词： 固定资产   资产管理   管理效率   RFID技术  

摘要： 固定资产是企业开展经营活动的重要生产工具,也是企业资产的重要组成部分,固定资产的规模一定程度上反映了企业的生产经营实力。因此,管理好企业的固定资产、保障资产的合理有效利用是一项十分重要的工作,实现固定资产的精细化管理对提升企业的综合竞争力和促进企业的长远发展具有重要的意义。本文主要围绕Z公司固定资产具有数量庞大、地点分散、流动性大等特点,对Z公司固定资产管理的现状进行了分析,指出了其固定资产管理过程中存在的问题,并对如何改进和提升公司固定资产管理水平提出了相关的对策建议,以期为推动企业的经营管理和长远发展提供有益参考。