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关键词： 布隆过滤器   RFID   冗余数据   动态附加   误判率  

摘要： 针对RFID设备在读取标签信息时产生的高度冗余会造成实时传输压力、存储空间浪费和上层应用分析结果不可靠等问题,提出一种动态附加布隆过滤器算法(Dynamic-Additional Bloom Filter,DATRBF)来清除RFID冗余数据。首先结合RFID动态数据流特点,利用时间和阅读器因素的影响设计了基础布隆过滤器(Time-Reader Bloom Filter,TRBF),然后根据定时间区间内数据量变化动态决定是否调整或附加额外的TRBF,通过附加TRBF从而扩充数组的方式将误判率控制在阈值内,最后结合两个过滤器对数据是否冗余进行综合判断。实验证明,在过滤RFID实时动态数据流中的冗余数据时,DATRBF算法相比传统布隆过滤器(Bloom Filter,BF)和时空布隆过滤器(Temporal-Spatial Bloom Filter,TSBF)有明显的优势,在数据量随机波动时DATRBF的误判率平均约为TSBF的49%,且DATRBF算法能够在数据量持续上升时保持平稳的低误判率。

关键词： 射频识别   电子标签   危险化学品   生命周期   安全管理  

摘要： 围绕射频识别(RFID)技术特点和危化品全生命周期安全管理需求,总结和分析了危险化学品领域RFID技术的研究应用现状和存在问题,提出了加快危化品领域RFID技术应用标准规范体系建设、推动行业工业互联网标识解析体系构建、开发和推广统一的全生命周期监管平台等未来需要加强研究和布局的方向。

关键词： RFID   anti-collision   Aloha   multi-tree   AMTS  

摘要： Radio frequency identification technology is one of the main technologies of Internet of Things(IoT).Through the transmission and reflection of wireless radio frequency signals,non-contact identification is realized,and multiple objects identification can be ***,when multiple tags communicate with a singleton reader simultaneously,collision will occur between the signals,which hinders the successful *** effectively avoid the tag collision problem and improve the reading performance of RFID systems,two advanced tag identification algorithms namely Adaptive M-ary tree slotted Aloha(AMTS)based on the characteristics of Aloha-based and Query tree-based algorithms are *** AMTS,the reader firstly uses the framed slotted Aloha protocol to map the tag set to different time slots,and then identify the collided tags using binary search method based on collision factor or mapping *** performance analysis and extensive experimental results indicate that our proposed algorithms significantly outperforms most existing anti-collision approaches in tag dense RFID systems.

关键词： 装配式建筑   RFID技术   BIM技术   施工管理   应用  

摘要： 文章以RFID与BIM技术概况为切入点,分析装配式建筑中应用RFID与BIM技术能够实现全寿命周期资源共享与信息传递,提高生产效率,缩短监控工期。以此为基础,结合某装配式混凝土结构工程,提出施工管理中BIM与RFID技术应用措施,从而为相关工作者提供参考。

关键词： 农产品冷链物流   消费环节   果蔬农产品   物流过程   物流系统   生鲜农产品   自动录入   RFID技术  

摘要： 果蔬农产品冷链物流是指蔬菜、水果等生鲜农产品从产地采收后,产品加工、贮藏、运输、分销、零售等环节始终处于适宜的低温控制环境下,最大程度地保证产品品质和质量安全,防止污染的特殊供应链系统。果蔬农产品的含水量高、保鲜期短,极易腐烂变质,因此不仅要求整条供应链各环节处于低温环境,即实现全程的温度控制,而且需要快速进入消费环节以减少损耗。因此果蔬农产品冷链物流首要解决的问题是如何自动录入物流过程中的大量信息。射频识别(RFID)技术的出现很好地解决了底层信息的采集问题,它将极大提高冷链物流各环节的自动化处理水平,增强物流系统运作效率,降低物流成本。

关键词： Multi-Station   Multi-Shuttle   Transportation   Shuttle   Calling   RFID   Communicating   Start-Node   End-Node  

摘要： Nowadays, the Multi-Shuttle and Multi-Station Transportation System (MMTS) is one of the most interesting research topics in many fields of industries. It is an effective solution to reduce unexpected accidents that occur during transportation as well as increase productivity in manufacturing. The aim of this paper is to introduce the controller design for the MMTS which is built in our BK-Recme BioMech Lab at Ho Chi Minh City University of Technology (VNU-HCM), Viet Nam. Based on the design of this system, the control algorithms will be conducted to check the operation of the whole system. To evaluate the feasibility and effectiveness of this model, we design a series of random instances for different quantities of nodes as well as the different quantities of shuttles. Our system includes 4 stations and 6 shuttles which are assembled in the serial chain system. However, the number of stations and number of shuttles can be expanded to any desired ones which are based on the requirement of the industries. In this paper, we mainly focus on the controller design of this system to make it operate in an effective way that the goods will be transported and delivered to the target station as fast as possible. In order to solve the large-scale instances and realistic transport problems, we propose three algorithms for three progresses as shuttles calling, path reading and shuttles communicating. The shuttles calling is to decide which shuttle should be called to the start-node. Path reading to determine the shortest way to go from start-node to end-node. Finally, shuttles co

关键词： 无线射频识别   双PUF   伪随机数发生器   认证协议   安全隐私  

摘要： 针对Liang等人提出的基于双物理不可克隆函数(physical uncloneable function,PUF)的无线射频识别(radio frequency identification,RFID)认证协议进行分析发现其存在安全隐患,不能抵抗重放攻击、去同步攻击、标签伪造等恶意攻击.为解决由于恶意攻击者对RFID系统所造成的安全隐患问题,提出一种基于双PUF的RFID认证协议DPRAP.在伪随机数发生器种子生成阶段,不直接在非安全信道上传输种子的通信值,通过多次的Hash与异或运算对种子的值进行加密隐藏,保证协商种子的机密性;在标签与服务器的伪随机数发生器种子协商过程中,使用一个时间阈值,防止攻击者恶意阻塞通信信道引发去同步攻击,确保服务器与标签端的伪随机数发生器种子的同步性;在认证阶段,在认证信息中增加使用标签的身份标识IDS来对标签的合法性进行验证,防止标签假冒攻击.通过使用BAN逻辑和Vaudenay模型对DPRAP协议进行形式化分析和验证,证明DPRAP协议满足不可追踪性,能够抵抗去同步攻击、标签假冒攻击等攻击手段,结果表明DPRAP协议具有更强的安全隐私性和更好的实用性.

关键词： 全双工射频识别系统   鱼道   PIT标签   监测效率   过鱼效果  

摘要： 全双工射频识别系统(RFID)相较于半双工具有操作简便、数据传输方便等优势,国外广泛应用于鱼道过鱼效果评价。针对而国内相关研究较少的现状,以植有PIT标签的仿野生齐口裂腹鱼(Schizothorax prenanti)识别与否作为评判系统监测效率高低的依据,定量分析鱼体入射角度、鱼体入射范围、鱼体长大小和游泳速度对全双工射频识别系统监测效率的影响,以接收到监测数据作为因变量,构建Logistic回归模型,利用AIC模型准则筛选出最优的Logistic回归模型。结果表明,游泳速度(P=0.001)和鱼体长大小(P=0.03)与系统成功监测概率呈负相关。鱼体入射角度(0°~90°)对系统监测效率的影响不显著(P>0.05);鱼体入射范围0~10 cm的监测效率显著高于入射20~30 cm和30~40 cm(P<0.05)。为进一步提高鱼道监测效率,建议在开展实际鱼道工程监测前,应掌握鱼类基础参数(如体长)和行为(如游泳速度)数据,合理布置天线位置,将有助于为监测评估后的鱼道优化设计提供技术支撑和数据参考。

关键词： Image denoising  

摘要： RFID label image is often polluted by noise, which reduces the efficiency of feature recognition of RFID label geometric distribution and affects the subsequent optimization. Aiming at it, this paper highlights a denoising algorithm for RFID label image based on singular spectrum analysis of phase space reconstruction. First, RFID label image is transformed into some sequence signals. Second, the improved Cao algorithm and SSA algorithm is proposed to denoise image, moreover, the processed sequence signal is reconverted to get the denoising image. In the paper, the rules of choosing the percentage to eliminate eigenvectors in SSA and how to superimpose the grayscale matrix are stipulated to improve the denoising efficiency. Finally, this paper compares the proposed algorithm with three denoising algorithms on different RFID label images to verify the effectiveness of this algorithm. The PSNR of the proposed algorithm are at least 0.3 dB higher than other denoising algorithms and the SSIM of the proposed algorithm are basically similar as NLM. Specially in the RFID semi-physical simulation experimental platform, the average of the SSIM of the square labels is 0.002 higher than NLM. The experiments show that the proposed algorithm in this paper is superior to the current common algorithms. © 2021 Computer Society of the Republic of China. All rights reserved.

关键词： wearable fabric RFID tag   wearable RFID tag   UHF RFID tag   RFID entrance system   conductive fabric   RFID entrance control system   wearable RFID antenna   conductive fabric RFID tag   fabric UHF tag antenna  

摘要： This paper presents the design of a 920 MHz Ultra High Frequency (UHF) band radio frequency identification (RFID) conductive fabric tag antenna. The DC (Direct Current) resistance and impedance of the conductive fabric are measured by a DC multimeter and by a network analyzer at a UHF frequency band. The conductivities of the fabrics are calculated with their measured DC resistance and impedance values, respectively. The conductivities of the fabric are inserted into the CST simulation program to simulate the fabric tag antenna designs, and the results of the tag designs with two conductivities are compared. Two fabric UHF RFID tag antennas with a T-Matching structure, one with the name-tag size of 80 x 40 mm, and another with 40 x 23 are simulated and measured the characteristics of tag antennas. The simulated and measured results are compared by reflection coefficient S11, radar cross-section and reading range. The reading range of the 80 x 40 mm fabric tag antenna is about 4 m and 0.5 m for the 40 x 23 size tag. These fabric tags can be easily applied to an entrance control system as they can be attached to other fabrics and clothes.