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关键词： cloud computing   Internet of Things   LoRaWAN networks   Military applications   RFID   smart devices   smart cities  

摘要： In recent years, a lot of advanced technologies have come into light. Amongst them, Internet of Things (IoT) is one of the most used technologies which has improved the lifestyle worldwide. IoT helps to interconnect the information network and the real world of concrete objects and places called ''things'' to achieve the demand of the future. In this concern, this paper presents the overview of IoT architecture, its key features, and advancements in the field of IoT. Further, paper discusses the challenges, issues and future scope of the technology. The paper also demonstrates an example of optical IoT based model in the field of humidity and dust monitoring using optical sensors with simulation results.

关键词： COVID-19 pandemic   contact tracing   hospital   office settings   BLE   RFID   indoor infection spread   human-human proximity   IoT   wireless sensing systems  

摘要： COVID-19 is highly contagious and spreads rapidly;it can be transmitted through coughing or contact with virus-contaminated hands, surfaces, or objects. The virus spreads faster indoors and in crowded places;therefore, there is a huge demand for contact tracing applications in indoor environments, such as hospitals and offices, in order to measure personnel proximity while placing as little load on them as possible. Contact tracing is a vital step in controlling and restricting pandemic spread;however, traditional contact tracing is time-consuming, exhausting, and ineffective. As a result, more research and application of smart digital contact tracing is necessary. As the Internet of Things (IoT) and wearable sensor device studies have grown in popularity, this work has been based on the practicality and successful implementation of Bluetooth low energy (BLE) and radio frequency identification (RFID) IoT based wireless systems for achieving contact tracing. Our study presents autonomous, low-cost, long-battery-life wireless sensing systems for contact tracing applications in hospital/office environments;these systems are developed with off-the-shelf components and do not rely on end user participation in order to prevent any inconvenience. Performance evaluation of the two implemented systems is carried out under various real practical settings and scenarios;these two implemented centralised IoT contact tracing devices were tested and compared demonstrating their efficiency results.

关键词： Localization   RFID   Robot  

摘要： Radio Frequency IDentification (RFID) is emerging as a vital technology of the Internet of Things (IoT). Billions of RFID tags have been deployed to locate daily objects such as equipment, pharmaceuticals, vehicles, and so on. Unlike previous solutions that focus on localizing tagged objects in the world coordinate system in reference to reader antennas, this work exploits a system, called RFCamera, that can identify and locate RFID-tagged objects in images with pixel dimensions. Our core insight is that an image is a visual AoA profile in terms of lights, which is resulted from the pinhole camera model. Similarly, we generate an RF image derived from the AoA profile of a tag using the same pinhole model as the camera. Consequently, the locations of visual entities corresponding to tagged objects are highlighted by comparing two types of images. To this end, we customized a camera system equipped with a pair of rotatable reader antennas. Our experimental evaluation demonstrates that RFCamera enables a mean error of 5.7. and 2.9. at azimuth and elevation angle estimation, respectively. It can locate a visual entity with a mean error of 51 pixels (i.e., approximate to 1.3 cm at 96 dpi) in a 640 x 480 image.

关键词： Smart city   Internet of things   Radio frequency identification technology   Power inspection   Expert analysis system  

摘要： As the basic element and module unit in the construction architecture of smart city, the Internet of things (IoT) is also the key foundation and important support for realizing "automatic perception, rapid response, and scientific decision-making" of smart city. The study aims to improve the efficiency of power inspection in power enterprises and provide intelligent technology for power inspection. After the theoretical analysis of IoT and RFID tech-nology under the background of smart city, the study discusses the information acquisition principle of RFID technology. Second, based on IoT and smart grid, the study takes the power equipment of power company A as an example, and puts forward the power inspection scheme, including the information required for inspection and the inspection of primary and secondary equipment. The specific contents are as follows: health assessment is carried out according to the real-time alarm of power equipment, and the control command is sent to the downstream control equipment to confirm the alarm information. Meantime, based on the alarm information of power equipment and related equipment, the expert analysis system is used for reasoning and analysis, and the RFID tag is used to supervise the inspectors to arrive at the site and inspect the situation according to the pre-determined route. The temperature of the cable of power company A is measured under normal and hidden dangers, and the body insulation test is conducted on No. 1 main transformer. The results show that under normal operation, the cable temperature at each point is slightly different, which is basically about 40 degrees C. The temperature before the fourth point of the cable rises obviously, indicating that the fourth point has faulty. Over time, the more chemical molecules are detected in phase A. When phase B and phase C are tested on the same day, the difference of chemical molecular content is relatively small. It indicates that the chemical molecular content de

摘要： In daily life, the purchases of glossaries in supermarkets are increased by a number of people. In the bill section, the customers may be waiting for few minutes to get the bill and payment process. The present system at the store should be maintained in line with the scanning sight of the barcode affixed to the product. The central concept of the proposed system aims to save the customer's time at the billing counter and helps to purchase their desired quality products according to preferences in a comfortable and relaxed manner in shopping malls or supermarkets. RFID has not required a line of sight technology to scan the product. It can also track multiple objects at the same time. The RFID reader attached to the cart and an RFID tag added to each product if it is in the specified range sends the feedback signal to the reader, and the shaufing list is transmitted wirelessly to the server and also on the cart screen, where the updated facts appear whenever the customer adds, or removes any product on or from the cart and automatically displays the revised bill. The payment can be made either by cash or online payment gateways.

关键词： Localization   mobile robot   radio-frequency identification (RFID)   sensor fusion   synthetic aperture radar (SAR)  

摘要： Radio-frequency identification (RFID) and computer vision (CV) technology are widely employed in intelligent storage systems for sensing, locating, identifying, and monitoring storage cargo. However, both of them have applicability scenarios and limitations. In this article, we propose a system for spatial perception of storage cargo based on the fusion of RFID and CV data. Specifically, we employ a mobile robot carrying an RFID reader and an RGB camera to move between shelves. The reader is connected to two vertically deployed antennas that receive phase values from the tags on the cargo to perform phase unwrapping. Then, we construct a linear system of equations to solve synthetic aperture radar (SAR)-based 3-D localization to obtain the location of the target tag efficiently and accurately. For the images of the shelves captured by the RGB camera, we use image localization techniques based on color and texture features to obtain the pixel coordinates of the cargo in the image. Since the sampling range of the RFID reader antenna is larger than the shooting range of the RGB camera, we use the coherent point drift (CPD) algorithm with threshold judgment to match the localization results of the two subsystems, enabling us to display the inherent information of the target cargo on the plane rendering. Our proposed system is evaluated through various experiments, and the results show that our localization algorithm achieves high accuracy in 3-D space, and the matching algorithm has high robustness to the number of cargo and missing cargo or tags.

关键词： Flexible electronics  

摘要： The advancement of printed flexible electronics technology endows RFID tags with a simple fabrication process and innovative features such as flexibility, stretchability, and wearability. Flexible RFID tags based on printed flexible electronics technology are attracting considerable research interest. There are two main factors to consider when employing flexible printed electronics technology to create a flexible RFID tag antenna. One is the antenna structure design and the selection of conductive and flexible substrate materials, and the other is the fabrication of antenna prototypes and performance assessment that can satisfy specific demands. Both bring significant challenges to the materials, printing process, structural design and performance tuning of the antenna. Currently, most research is focused on the design and structure optimization of flexible RFID antennas, with just a few exceptions in inkjet printing based flexible electronics technology. Flexible antennas and printed flexible electronics technologies are yet to be efficiently combined, and systematic research and mutual development in terms of material selection, antenna design and simulation, prototype fabrication and measurement are yet to be achieved. Therefore, there is a strong need to do the research work in this field. This paper summarizes the current advances in flexible printed RFID antennas, with particular attention to antenna design, material selection, fabrication technologies, and applications. The challenges in each aspect are also explored. Further research should concentrate on the development of innovative materials with improved electrical properties and good surface functionality, the optimization of the fabrication processes, and the intelligent structural design of RFID antennas for multifunction operation. This paper is expected to provide guidance and new ideas for the development of flexible RFID tag antennas.

关键词： RFID   环网柜   肘形电缆头   智能测温  

摘要： 为响应浙江电网多元融合的高弹性电网建设需求,研发并在实际电网中应用了一套基于RFID无源无线物联网技术的环网柜肘形电缆连接头智能温度在线监测系统,有效解决环网柜肘型电缆头被柜体密封而无法监测温度问题,同时挖掘沉睡资源、注重创新发展、大幅提高电网的安全抗扰能力,改善电网辅助服务能力,提高电网安全抗扰能力,推进新型电力系统建设。

关键词： 表面贴装技术   射频识别技术   智能供料   微控制器  

摘要： 分析当前表面贴装技术的现状,针对生产线操作工人专业知识的欠缺,以及长期处于单调枯燥的工作状况下,易出错的问题,对射频识别技术在生产线的广泛应用进行研究,提出一种智能供料的方法。该方法介绍了智能供料系统中各硬件组件的具体实施方案,实现预定的功能,达到智能供料的目的。