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关键词： RFID   Fish gillnet   Crab pot   Gear marking   Norwegian Sea   Barents Sea  

摘要： Marking of fishing gear is an important step in reducing abandoned, lost, and discarded gear, thereby reducing the amount of plastic pollution in the sea. With the help of fishers in their daily work on the Norwegian coast, we have performed several trials using radio frequency identification (RFID) tags to mark crab pots and gillnets. The results show that RFID tags are well suited to mark individual crab pots without affecting the daily work of fishers, and there is no evidence that the tags affect the catch. However, the trials uncovered that the tags easily entangle in the fish gillnets, creating much hassle for the fishers. Also, the heavy stress on the tags while hauling the gillnets damaged several tags. Therefore, we can not recommend marking gillnets with RFID tags before more appropriate tags have been identified and tested.

关键词： fish   freshness   indicators   intelligent packaging   RFID   sensors   shelf life  

摘要： Nowadays, due to the changes in lifestyle and great interest of consumers in a healthy life, people have started increasing their seafood consumption. But due to their short shelf life, experts are looking for a new packaging called smart packaging (SMP) for seafood. There are different indicators/sensors in SMP;one of the effective indices is time-temperature, which can show consumers the best time of using seafood based on their shelf life and experienced temperature. Another one is radio-frequency identification (RFID) that is a transmission device that represents a separate form of the electronic information-based SMP systems. RFID does not belong to any of the categories of markers or sensors;it is an auto recognition system that applies cordless sensors to indicate segments and collect real-time information without manual interposition. This review covers the use of SMP in all marine foods, including fish, due to its high consumption and high content of polyunsaturated fatty acids, eicosapentaenoic acid (C20:5n-3) and docosahexaenoic acid (C22:6n-3), which are the considerable factors of n-3 polyunsaturated fatty acids for human.

关键词： RFID   Internet-of-Things   service parts operations   reverse supply chain  

摘要： Businesses are expected by the society to operate sustainably nowadays. However, companies are having a hard time to make business decisions to achieve both business sustainability and environmental sustainability, especially when such decisions involve numerous uncertainties. Making the wrong decision can result in damaging reputation in the least and going out of business in the worst. In this case study, we consider companies providing service parts maintenance, which have a great potential to bring positive impacts to the environment by refurbishing and reusing the replaced items. However, these companies also need to weight against cost effectiveness of doing so to maintain business sustainability. Informed decision making, meanwhile, is achievable with the use of the latest technologies. Here, we present the integration of Internet-of-Things to collect and provide real-time data for business analysis, such that companies can decide effectively which item(s) can be refurbished economically. We show that by doing so, uncertainties concerning the cost of refurbishment can be reduced, such that service parts operators can achieve both business sustainability and environmental sustainability.

摘要： As mankind leads into a new age of modernization, security issues and measures have become exceedingly important. Considering an educational institute or workplace, keeping one's belongings safely with a minimal interface is the need of the hour. The traditional lock and key method of keeping personal items safe is clumsy and inconvenient. The recent developments in technology have provided innovative solutions to this problem. Gone are the days of the troublesome key and lock. Radio Frequency Identification (RFID), along with Internet-of-Things (IoT), is a secure, user-friendly and efficient method to safeguard things. This combination comes with advantages such as high security, simplicity, cost-effectiveness and ‘misplace-proof’ methodology. This paper proposes a Smart RFID-IoT based Locker system. The locker works on RFID authentication technology, which is unique to every identity card of the user. It is also enabled with Wi-Fi connectivity to facilitate continual status monitoring, user login-logoff data storage, and unauthorized access surveillance.

关键词： Remote sensing  

摘要： Localization of passive Radio-Frequency Identification (RFID) tags has been used to monitor landslide surface displacement since 5 years. This method, applied on slow displacements lower than 1cm per day, allows a high spatiotemporal resolution at a relatively low cost. With the feedback of the previous years, this paper proposes to summarize the various challenges encountered with the long-term outdoor RFID localization method, and presents data-processing solutions that were implemented to overcome these challenges. We propose a complex-smoothing unwrapping algorithm, a multi-frequency merging operation, as well as multi-tag and multi-antenna phase combining method. The concept of an unwrapping reference guide is presented and applied with groups of tags showing coherent displacements, or with absolute reference measurements. These approaches allow a higher data availability up to 38% for one site over multiple years, and a better phase unwrapping. Earth surface displacement monitoring with RFID proves to be a robust and accurate solution, with four equipped sites across France and Switzerland. © 2023, CC BY.

关键词： Polarization  

摘要： There is much interest in fine-grained RFID localization systems. Existing systems for accurate localization typically require infrastructure, either in the form of extensive reference tags or many antennas (e.g., antenna arrays) to localize RFID tags within their radio range. Yet, there remains a need for fine-grained RFID localization solutions that are in a compact, portable, mobile form, that can be held by users as they walk around areas to map them, such as in retail stores, warehouses, or manufacturing plants. We present the design, implementation, and evaluation of POLAR, a portable handheld system for fine-grained RFID localization. Our design introduces two key innovations that enable robust, accurate, and real-time localization of RFID tags. The first is complex-controlled polarization (CCP), a mechanism for localizing RFIDs at all orientations through software-controlled polarization of two linearly polarized antennas. The second is joint tag discovery and localization (JTDL), a method for simultaneously localizing and reading tags with zero-overhead regardless of tag orientation. Building on these two techniques, we develop an end-to-end handheld system that addresses a number of practical challenges in self-interference, efficient inventorying, and self-localization. Our evaluation demonstrates that POLAR achieves a median accuracy of a few centimeters in each of the x/y/z dimensions in practical indoor environments. © 2023, CC BY-NC-SA.

关键词： Sensors   Resistance   Dipole antennas   Resonant frequency   Damping   Antennas   Impedance   Gas sensor   passive sensor   radio frequency identification (RFID)   ultrahigh frequency (UHF)   wireless  

摘要： frequency (UHF) radio frequency identification (RFID) tags provide an inexpensive framework for distributed sensing, yet for the most cost-effective implementation, it is necessary to consider antenna design in concert with the capabilities of responsive materials that can be coupled to the tag response. Materials, such as functionalized carbon nanotubes (CNTs), have been engineered to change in resistance when exposed to a variety of analytes and have been incorporated in RFID tags to create low-cost sensors that work at a fixed reader-tag separation distance. This article presents a damped double dipole antenna design enabling UHF RFID tags that are able to sense changes in resistance of a sensing element (with a conductivity similar to that of printed CNT networks) regardless of reader-tag distance within the far-field read range. Simulations of the proposed design show two methods of operation, either by comparing the damping between two resonant peaks or by shifting the resonant frequency of the RFID tag. The first method is validated experimentally with surface mount resistors, showing a relative change in the effective antenna transmission coefficient, tau(e), of 0.2 for a 35% change in resistance of the sensing element.

关键词： RFID systems   Tag searching   Target tags   Time efficiency  

摘要： Nowadays, RFID technology has been widely applied in inventory management, logistics tracking, identity recognition and so on. In an RFID-assisted large warehouse, customers often require the warehouse to provide the tag searching service to determine which given tags are present in the system. There are two major challenges in tag searching, one is how to exclude the interference caused by unexpected local tags, and the other is how to utilize the known IDs of wanted tags to improve the searching efficiency. In this paper, we propose a Bloom filter based tag searching protocol called BFSearch, which consists of two phases: non-wanted tag deactivation phase and target tag verification phase. In the non-wanted tag deactivation phase, we design a composite filter vector, which can deactivate the local tags that do not belong to the target tag set for eliminating their interference. We further propose an enhanced Bloom filter based tag searching protocol called BFSearch+, which implements a one-to-one correspondence between wanted tags and slots to discover the target tags. It can further improve the time efficiency by up to approximately 50%. Extensive theoretical analysis and simulations illustrate that the proposed BFSearch+ protocol outperforms the state-of-the-art ones.

关键词： 中心血站   献血量   血液中心   条码技术   RFID技术   统计公报   等待时间   无偿献血  

摘要： 根据《2021年我国卫生健康事业发展统计公报》的数据显示,2021年我国无偿献血突破1600万人次,千人口献血率达到12‰,献血人次和献血量逐年稳步增长。1998年开始,我国实行无偿献血,发展到现在国民对无偿献血的认识和理念已经比较成熟,我国无偿献血事业进入稳步增长的阶段。现阶段我国大部分的血液中心、中心血站采用条码技术采集记录血液信息。血液入库前需要逐袋扫描条码完成核验,血液入库等待时间长;血液库存实物盘点,需要将血液搬出后逐袋清点核查。

关键词： 智能家居   RFID   WSN   ECC   密钥协商   身份验证  

摘要： 针对智能家居产品规模小、配置简单、系统开销小等特点,结合ECC速度快、安全性高、运算和存储要求小等特点,提出基于ECC的智能家居感知层密钥管理技术方案.方案从RFID和WSN入手,通过ECC有限域选取、安全参数选取、初始化、密钥协商、身份验证、信息通信、WSN节点删除等阶段,对基于ECC的智能家居RFID和WSN的密钥管理技术进行详细论述,针对RFID和WSN的身份验证过程给出安全性分析和性能分析.在此基础上,提出了加入可信第三方、分簇传感器网络、混合式密钥管理技术等相关技术以提升性能.方案兼顾了智能家居产品的安全性和性能要求,有效解决了基于ECC的智能家居感知层密钥管理安全问题.