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关键词： RFID   人流量监控   阀值  

摘要： 当前的教学楼在真实人流疏散中总会出现较长时间的人流拥堵,在这种情况下极易造成安全事故。本课题基于UHF RFID技术实现对人流量的实时监控,实时显示各个入口、通路等的人群流量大小,可设置的各个入口及通路的人群最大流量阈值,超过阈值即发出预警,实现目标RFID标签的定位。系统具有教学楼二维或者三维可视化地图,实时显示目标在地图中的可能位置,为紧急情况下人群疏散提供安全保障。

关键词： RFID   智慧堡垒   书柜  

摘要： 为了实现自助借书还书、简化流通处理流程、改进读者借阅服务质量,设计了一款搭载自助图书借还系统的“智慧堡垒”。以云计算、大数据技术为理论基础,与各类图书平台紧密结合,以信息化、智能化服务为平台支撑,经过对信息资源的有效整合,提出了智慧图书平台建设及应用方案,拓展了基于云平台的智慧图书平台设计与实现领域的研究,建立了一个完善的智慧图书大数据平台体系。该平台能有效提高图书资源管理与监控的效率和智能化,实现“精细化管理、协同化支撑、个性化服务”的发展目标。

关键词： 柔性制造车间   RFID   网络规划   多目标  

摘要： 针对具有多种覆盖需求的柔性制造车间RFID网络规划问题,以部署成本、阅读器干扰与阅读器效能为多优化目标,提出一种分层聚类、冗余消减与梯度下降方法集成的RFID网络规划方法,采用分层聚类算法确定RFID初始数量与部署位置,采用冗余阅读器消减算法优化RFID数量,采用梯度下降算法优化RFID部署位置从而实现网络规划多目标优化。实验研究表明,提出的方法在多目标综合性能方面优于传统基于分层聚类方法、遗传算法、粒子群与冗余消减混合方法的RFID网络规划方法,验证了该方法的有效性。

关键词： 消防站   射频识别标签   RFID技术   消防应急指挥   可用资源   技术设备   人民  

摘要： 当前,消防站技术设备管理是基于系统的集成和智能解决方案的创建,但大部分情况并不是技术所能提供的最有效的选择。若将RFID技术运用到当前消防站系统的运行中,可提供更快速、高效和更可靠的保障,能够清楚地管理消防站的情况和可用资源,从而更好地保护人民的生命和财产。

关键词： Authentication   Estimation   Protocols   Radiofrequency identification   Random variables   Wireless communication   Hash functions   Large-scale RFID systems   batch authentication   bloom filter  

摘要： In this letter, a batch authentication protocol called as accurate bloom-filter-based batch authentication (ABBA) protocol is presented for large-scale radio-frequency identification (RFID) systems. Similar to its predecessor BBA, ABBA can estimate the number of invalid tags contained in an unknown tag set in one communication round by exploiting a bloom filter (BF) vector constructed distributively by the tags. Whereas different from BBA, ABBA adopts a novel BF vector construction method where the randomness caused by valid tags is removed, and thus the estimation is guaranteed to be more accurate and stable than BBA. Both theoretical analysis and extensive simulations confirm the superiority of ABBA over BBA.

关键词： Resonators   Resonant frequency   RFID tags   Substrates   Shape   Frequency selective surfaces   Mirrors   Chipless radio frequency identification (RFID)   cross-polarization   polarization independent   resonators  

摘要： This article presents a method to analyze co- and cross-polarized responses of the resonators exploited in the development of frequency-coded chipless radio frequency identification (RFID) tags. The method uses the complex radar cross Section (RCS) matrix to characterize the polarization of the scattered response of resonators. Four different symmetry states are introduced, and all resonators are classified under each category based on their structures. Then, the complex RCS matrix is obtained for each group. Then, four different resonators, each representing the respective symmetry state, are simulated and measured to validate the theory. To highlight the advantages of the presented method, two significant applications of the method are investigated. The presented theory is used in the first application to determine resonator structures for designing orientation independent cross-polarized tags. The proposed technique not only accelerates the design of frequency-coded chipless RFID tags but also helps figure out proper geometry for resonators with cross-polarized responses with minimum amplitude deviation at different azimuth plane orientation angles. In the latter application, we predict co- and cross-polarized responses of a tag at arbitrary orientation angles, using one initial measurement. This prediction provides a thorough insight into the co- and cross-polarized responses of tags at different orientation angles.

关键词： Location   radio frequency identification (RFID)   retail   robotics  

摘要： This article presents a simple solution to estimate the location of products in a retail store, using an autonomous ground robot with a radio frequency identification payload. The model used and explained in this article is designed to be as simple and versatile as possible, while achieving accurate location estimations when compared with other proposed models in the state of the art. In addition, the solution developed meets the business requirements of the retail industry, such as locating at stock keeping unit level, as opposed to item level, or expressing the location in terms of store fixtures (e.g., shelf and rack) as opposed to (x,y) coordinates. The research results are obtained from experiments of the model in different environments, achieving accurate location estimations in a controlled laboratory environment. Moreover, for the first time, the model has been tested in a large retail store, where the results obtained met the requirements of the store owners.

关键词： RFID   fresh product   contracting coordination   three-tier supply chain  

摘要： This paper focuses on the impact of radio-frequency identification (RFID) technology adoption on supply chain coordination. We consider a three-tier supply chain consisting of one supplier, one transporter and one retailer with centralized and decentralized decision-making. Considering the factors of RFID tag cost and product freshness, two scenarios - with RFID and without RFID - are analyzed. In the decentralized supply chain, a revenue-sharing contract is established to explore each partner's decisions on ordering quantity, wholesale price and profits. The results show that (1) the tag cost of RFID has different effects on the pricing decisions, ordering quantity and profit of an FPSC, and if the amount of transportation time compression increases, the range of the tag cost's boundary value will be wider when adopting RFID technology;(2) when the members of an FPSC choose the optimal wholesale price, optimal initial fare and appropriate revenue-sharing coefficient, the FPSC can achieve a win-win result;and (3) the amount of transportation time compression has a positive correlation with the expected profit of the supplier, transporter and retailer but has a negative correlation with loss of the product.

关键词： Cotton   Ginning   Plastic contamination   Logistics   RFID   GNSS   GPS   GIS  

摘要： Cylindrical modules, also known as round modules, are becoming a more common method of seed cotton storage and transport. Increasing use of cylindrical modules has led to the development of new methods of field staging, transport, and handling at the gin. A low-cost smart cotton module tracking and monitoring system (SCMTM) was developed for recording module tag numbers, equipment location, and images of the modules automatically. The SCMTM system was mounted on a cotton module loader and module truck in a gin yard of Texas. Data was recorded automatically using the SCMTM system and used for analysis of cotton module handling logistics and wrap damage. Route and throughput rates of the loader were calculated, and the time required per module was estimated. The study found that the loader was idle more than 46% of the total working period. Analysis of module images indicated a module wrap damage rate of 4.4% in the studied cases.

关键词： Simultaneous localization and mapping   Robots   Particle measurements   Atmospheric measurements   Mobile robots   Location awareness   Visualization   NonGaussian   particle smoother   RFID   SLAM   UPF  

摘要： In this article, we propose a simultaneous localization and mapping (SLAM) framework that combines the methods of the unscented particle filter (UPF) and particle smoothers (PS). The UPF is used to estimate the position and orientation of the mobile robot and PS are used to update the locations of landmarks. We show that UPF is capable of estimating the pose of the robot more consistently and accurately than generic particle filter and unscented Kalman filter (UKF) do, especially when the dynamic models of the robot are highly nonlinear or noises are nonGaussian. Then, the proposed SLAM framework is applied to high-frequency (HF) band radio-frequency identification (RFID) system. Since detection model of the HF band RFID system is highly nonGaussian, the traditional SLAM frameworks with the Gaussian assumption are not suitable and the proposed UPF-PS framework presents the superior performance. The proposed SLAM framework is evaluated through simulated experiments with an HF band RFID system and a range and bearing sensor. The comparisons between the proposed SLAM framework and four other SLAM frameworks, i.e., FastSLAM, UFastSLAM, and P-SLAM 1.0 and 2.0 are also given. Finally, the proposed SLAM framework is verified in a real experimental environment. The experimental results validate the effectiveness and superiority of the proposed SLAM framework.