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关键词： 多协议物联中介   生产线   全流程管控   RFID  

摘要： 由于空调、冰箱、洗衣机等家电产品生产线设备复杂多样,产线布局因不同产品种类存在差异,各类高端设备和信息化系统均存在不同的厂商、通讯协议等,不同系统之间存在数据壁垒很难兼容集成。以多协议物联中介为基础,融合产线关键设备进行系统结构设计,对全流程管控进行关键技术研究,对各系统软件进行功能升级开发,实现车间级产线信息化系统、RFID系统、MES系统、关键设备、移动终端等设备设施的融合集成、看板展示、全流程管控等功能,有效提升车间产线管理水平,实现智能化信息化管理。

关键词： 钢铁企业   信息化   物流管控   射频识别   智能制造  

摘要： 物流管控作为河钢唐钢新区智能制造架构体系中专业支撑层的重要组成部分,承担采购物流、生产物流和销售物流的仓储和运输功能。结合河钢唐钢新区物流管控平台项目建设,从系统功能架构设计、功能实现等方面,就河钢唐钢新区物流管控平台建设实践进行了阐述。

关键词： 室内定位   射频识别(RFID)   标签阵列   姿态检索  

摘要： 针对基于天线阵列测角的射频识别(Radio Frequency Identification,RFID)定位系统成本高、无法估计目标姿态的问题,提出了一种基于标签阵列的姿态检索的定位算法。首先,分析了天线方向角、标签阵列姿态角和标签阵列信号到达角之间的关系,建立了标签阵列姿态检索的定位模型;其次,对标签阵列中相位误差来源进行了分析,利用标签间的相位差对标签阵列信号进行重构,降低了读写器收发电路、标签电路及多径效应引入的相位误差对定位精度的影响;同时,分析了标签阵列中的互耦效应对相位的影响,提出了互耦效应相位校正方法,提升了标签阵列的测角精度;最后,提出了一种标签阵列姿态估计算法,使用多个天线的方向角实现对标签阵列姿态角估计和定位。实验结果表明,系统在室内环境下平均定位误差为0.2 m,标签阵列的姿态角估计平均误差为4.35°。

关键词： RFID   Mandate   Firm performance   Contextual factors  

摘要： On some occasions, information technology (IT) is mandated rather than voluntary. However, the impact of mandatory IT adoption receives little attention in the operations management literature, and the literature shows divergent predictions about how mandatory IT affects financial performance. Using the case of mandatory radiofrequency identification (RFID) adoption in manufacturing industries, this study applies long-horizon event study to examine 95 U.S. listed firms that have adopted mandatory RFID. The results show that firms achieve significantly strong financial performance from mandatory adoption. Mandatory RFID is particularly beneficial for firms with good financial health, late adopters and high-clockspeed firms. The current study provides a deeper understanding of supplier benefits from mandatory systems supported by dominant customers. Based on the lessons learned from past mandatory RFID adoption, the present study can serve as guidance for future projects and contribute to the literature on operations management and information systems.

关键词： RFID   Quality monitoring   Rapid monitoring   TTI   Indicator   Sensor  

摘要： Smart labels are an effective way to provide timely feedback to consumers on the quality of fruit and vegetables and have great potential for development and market application. This paper reviews the types and research progress of smart labels. It also summarizes the classification of various smart labels according to the factors affecting the quality of fruit and vegetables. Based on the characteristics of fruit and vegetables, smart labels suitable for fruit and vegetable quality inspection are collated, including ethylene-sensitive, color-sensitive and temperature-sensitive types. Finally, the future development and new applications of smart labels are foreseen.

关键词： RFID   frequency switching   PIN diode   metal mountable  

摘要： This paper presents an effective way to design an RFID tag antenna to operate at three different frequencies by incorporating a switching technique. PIN diode has been used to switch the RF frequency because of its good efficiency and simplicity. The conventional dipole-based RFID tag has been improvised with added co-planar ground and PIN diode. The layout of the antenna is designed with a size of 0.083 ?(0 )x 0.094 ?(0) at UHF (80-960) MHz, where ?(0) is the free-space wavelength corresponding to the mid-point of the targeted UHF range. The RFID microchip is connected to the modified ground and dipole structures. Bending and meandering techniques on the dipole length help to match the complex chip impedance with the dipole impedance. Additionally, it scales down the total structure of the antenna. Two PIN diodes are placed along the dipole length at appropriate distances with proper biasing. The ON-OFF switching states of the PIN diodes enable the RFID tag antenna to switch over the frequency ranges (840-845) MHz (India), 902-928 MHz (North America), and 950-955 MHz (Japan).

关键词： Near-field communication   RFID   tag IC   voltage doubler   phase-locked loop   passive transponder  

摘要： In this paper, we propose the RF interface of NFC tag IC which is necessary for transmitting the results obtained using blood glucose sensor, water quality sensor, gas sensor and radioactive sensor to portable devices such as mobile phones. The proposed RF interface complies with the ISO14443 type-A standard using 100% ASK and solves the power and clock generation difficulties by using the internal VTH canceling rectifier that is based on the high efficiency voltage doubler and the switching phase locked loop. In the measurement results, the internal VTH canceling rectifier in the RF interface shows more than 80% power efficiency from 100% ASK signal, and successfully generates 1.8 V / 2.5 V supply from the input signal power higher than 6 dBm through low loss voltage regulator. Additionally, we can verify that the proposed switching phase locked loop is locked at 8 dBm or higher input signal power and successfully demodulates ASK input signal.

关键词： Bandwidth   Antennas   Antenna measurements   Radiofrequency identification   Metals   Integrated circuits   Prototypes   Bandwidth enhancement   folded patch   metal mountable   small tag antenna  

摘要： A small antenna with a dimension of 36 x 39 x 1.5 mm (0.109 lambda x 0.118 lambda x 0.0045 lambda) is proposed for wideband metal-mountable applications. An excitation loop is designed within the antenna structure for achieving good energy coupling from the loop to the outer patch. With the introduction of a narrow stub, connecting the top and bottom conductors, the 3 dB impedance bandwidth of the proposed tag can be enhanced from 16 to 50 MHz, without modifying other design parameters. The bandwidth and the impedance matching between the antenna and the microchip can be tuned by varying the stub width. The gap separation between the top patches and the L-slot on the patch can also be adjusted for bandwidth optimization. The tag is readable from at least 6 m within 896-917 MHz, regardless of the metal plate dimension (12-24 cm). The tag is also readable from at a minimum of 4 m within a wide frequency range of 887-927 MHz, covering the entire US UHF radio frequency identification (RFID) band when attached to different sizes of metallic items.

关键词： Radio waves  

摘要： The rapid expansion of industrial technology necessitates the widespread use of radio frequency identification networks (RFID). Multiple (RFID) components must be installed in order to do this (readers, tags, computer systems, and so on). Networks are growing more expensive and sophisticated as a result of the requirement to add more readers. To supply strong service for (RFID) systems, figuring out the optimal quantity, position, and reader settings is a considerable task. Good planning ensures that (RFID) networks have (the coverage, load balancing, and reader overlapping they need). This problem is well-studied in literary works as a radio frequency identification network planning problem. In this paper, a number of algorithms that were used to improve the RFID Network Planning (RNP) model. © 2023 The Authors

关键词： Radiofrequency identification   Rhythm   Authentication   Servers   Protocols   Feature extraction   Usability   RFID security   authentication  

摘要： Passive RFID technology is widely used in user authentication and access control. We propose RF-Rhythm, a secure and usable two-factor RFID authentication system with strong resilience to lost/stolen/cloned RFID cards. In RF-Rhythm, each legitimate user performs a sequence of taps on his/her RFID card according to a self-chosen secret melody. Such rhythmic taps can induce phase changes in the backscattered signals, which the RFID reader can detect to recover the user's tapping rhythm. In addition to verifying the RFID card's identification information as usual, the backend server compares the extracted tapping rhythm with what it acquires in the user enrollment phase. The user passes authentication checks if and only if both verifications succeed. We also propose a novel phase-hopping protocol in which the RFID reader emits Continuous Wave (CW) with random phases for extracting the user's secret tapping rhythm. Our protocol can prevent a capable adversary from extracting and then replaying a legitimate tapping rhythm from sniffed RFID signals. Comprehensive user experiments confirm the high security and usability of RF-Rhythm with false-positive and false-negative rates close to zero.