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关键词： Protocols   Radiofrequency identification   Encoding   Probabilistic logic   Databases   Mobile computing   Art   RFID   missing tag identification   missing rate   time efficiency  

摘要： Radio frequency identification technology has been widely used to verify the presence of items in many applications such as warehouse management and supply chain logistics. In these applications, the challenge of how to timely identify the missing tags (namely tag searching or missing tag identification) is a key focus. Existing missing tag identification solutions have not achieved their full potentials because collision slots have not been well explored. In this paper, we propose an approach named collision resolving based missing tag identification (CR-MTI) to break through the performance bottleneck of existing missing tag identification protocols. In CR-MTI, multiple tags are allowed to respond with different binary strings in a collision slot. Then, the reader can verify them together by using the bit tracking technology and particularly designed string, thereby significantly improve the time efficiency. CR-MTI also reduces the number of messages transmitted by the reader using customized coding. We further explore the optimal parameter settings to maximize the performance of our proposed CR-MTI. Extensive simulation results show that our proposed CR-MTI outperforms prior art in terms of time efficiency, total executive time and communication complexity.

关键词： 汽车零部件   智能包装   RFID  

摘要： 随着汽车行业智能化的发展与应用,汽车零部件生产企业也需要不断提高响应速度。本文对于RFID智能包装在汽车零部件生产企业的制造过程、存储管理的具体应用进行了探讨,分析在工艺流程、现场布局、库位规划、物流路线等方面进行改善的基础上,RFID智能包装在库存管理、工作效率、成本等方面获得的成效。

关键词： RFID标签   可视范围   入境口岸   监控手段   冬奥会   国家体育场   首都机场   行李运输  

摘要： 2022年2月4日,举世瞩目的第二十四届冬季奥林匹克运动会开幕式在北京国家体育场隆重举行。作为2022年北京冬奥会唯一的官方入境口岸,首都机场利用RFID等技术对机场到北京、延庆、张家口3个奥运村之间的行李运输数据进行收集、共享,确保每件行李从托运的那一刻起就处在“可视范围”之内,为保障单位提供了可靠的监控手段,为冬奥会服务保障提供了有力的科技支撑。

关键词： RFID技术   测距   相位差   电子标签  

摘要： 针对衣柜中的衣物难以寻找以及衣物管理效率低下的问题,设计了一款基于RFID技术的智能衣柜系统。该系统采用了FPGA平台和RFID技术,主要由RFID阅读器、电子标签、FPGA模块和显示模块组成,相应的电子标签固定在衣物上,RFID阅读器作为发射和接收高频信号的节点,FPGA模块根据RFID测得的相位差来计算相隔的距离,进而确定电子标签的距离,并将测得的距离转换成电子标签在衣柜内的区域,显示在液晶屏上。实验验证表明,该系统能较好地完成定位测距功能,精度可达到厘米级,可以满足智能衣柜寻找衣物的需求。

关键词： 电网系统   物联网技术   RFID技术   系统构建  

摘要： 电力行业发展中,设备、资源、人员都发挥着非常重要的作用。从目前的发展趋势来看,电力行业逐步向着智能化和自动化的方向发展。互联网技术在电力系统的建设和发展中发挥着重要作用,主要通过物物之间的信息网络的构建,为电网设备的管理,以及电力系统运行过程中各个环节的联动,提供技术和资源等多方面的保障。RFID技术在电力物联网系统的应用中发挥着重要的作用,可以通过射频识别功能,使得运行中的物联网结构达到提升电网运行智能化程度的实际应用效果。

关键词： RFID   tag array   biometric authentication   vital sign   Internet of Things  

摘要： Nowadays, authentication systems are usually required to provide continuous, contactless, and non-intrusive services. In this paper, we propose RF-Badge, a vital sign-based authentication scheme on human subjects to meet the above requirements by using RFID technology. We consider two biometric features with individual diversity to characterize the vital sign of users, including the movement effect from respiration and the reflection effect from organs, especially the heart. To derive the movement effect from respiration, we build a phase-based geometric model to restore the fine-grained badge moving trace as the feature. To derive the reflection effect from human internal organs, we extract the reflection signal from the original signal and generate the spectrum as the feature. Besides, to deal with the feature deviation in different physical conditions of users, we propose a multi-condition network (MCNet) to further guarantee the generalization of RF-Badge. We implement a prototype system and evaluate the performance in real environments. The experiment results show that our system achieves the average false positive rate (FPR) of 3.9 percent and false negative rate (FNR) of 3.3 percent for continuous authentication within four signal cycles.

关键词： 变频器   编码器   无线通讯   射频识别技术  

摘要： 本文介绍了云南文山铝业铸造车间一套全自动轨道运输系统。原本铝锭下线全由人工操作叉车完成。因车间铸机相对集中,堆场距离铸机有一定距离,只能先将生产线铝锭先就近放置在车间,再由其他人将铝锭运送到铝锭堆场。即耗费人力和能源,又不利于生产管理,同时也存在一定的安全隐患。为解决这个问题,设计本套设备,以自动化设备代替人工,完成铝锭从铸机线到堆场的运输工作,将原本需要几个人完成的工作缩减为单人完成,提高了生产效率、管理效率,消除了一定的安全隐患。

关键词： 低频唤醒   射频识别技术   有源电子标签   星型拓扑   阅读器  

摘要： 为了有效降低RFID有源电子标签应用过程中的功率损耗,提升使用寿命,设计了一种基于低频唤醒的RFID有源电子标签。将低频唤醒技术作为电子标签系统硬件的主要元素,采用LC并联谐振电路设计理念,通过低频唤醒接收、高频收发、电源、控制、其余外设5个板块组建有源电子标签硬件结构。计算电路的谐振频率与品质因子,运用AS3933低频唤醒芯片监听固定区域频率生成的唤醒信号;使用C语言和星型拓扑下的工作流模型搭建RFID有源电子标签软件部分,为避免电子标签碰撞利用哈希算法确定各电子标签对应某唯一值,给标签配发输送时隙,利用得到的时隙和阅读器实现通信,完成低功耗有源电子标签设计目标。仿真结果证明,所提方法低频唤醒距离长且唤醒稳定性高,休眠功耗较低,有效延长了有源电子标签使用年限,拥有极强实用性。

关键词： RFID技术   烟叶收购   数据采集  

摘要： 针对现有烟叶收购过磅录级环节中手工操作容易出现数据错误的现状,利用RFID技术,以RFID标签载体作为烟叶等级牌,在不改动现有站点版烟叶收购系统的前提下,由烟叶过磅区域的烟叶等级自动识别入库器完成烟叶等级信息自动采集,提交站点版烟叶收购系统,完成烟叶等级信息的自动录入工作,以降低人为误操作。系统已研发完成并投入生产,实现了烟叶收购环节优化、降本增效、规范流程,提高了生产效率,在行业内推广应用前景广泛。

关键词： radio   frequency   identification   network   planning   sparrow   search   algorithm   elite   opposition-based   learning   Levy   flight  

摘要： To solve the problem that the performance of the coverage,interference rate,load balance andweak power in the radio frequency identification(RFID)network *** paper proposes an elite opposition-based learning and Lévy flight sparrow search algorithm(SSA),which is named elite opposition-based learning and Levy flight SSA(ELSSA).First,the algorithm initializes the population by an elite opposed-based learning strategy to enhance the diversity of the ***,Lévy flight is introduced into the scrounger’s position update formula to solve the situation that the algorithm falls into the local optimal *** has a probability that the current position is changed by Lévy *** method can jump out of the local optimal *** the end,the proposed method is compared with particle swarm optimization(PSO)algorithm,grey wolf optimzer(GWO)algorithm and SSA in the multiple simulation *** simulated results showed that,under the same number of readers,the average fitness of the ELSSA is improved respectively by 3.36%,5.67%and 18.45%.By setting the different number of readers,ELSSA uses fewer readers than other *** conclusion shows that the proposed method can ensure a satisfying coverage by using fewer readers and achieving higher comprehensive performance.