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关键词： 射频识别   门诊药房药品   调剂流程   应用价值   技术优化   流程优化  

摘要： 目的探讨基于射频识别(radio frequency identification,RFID)技术优化门诊药房药品调剂流程,对其临床应用价值进行分析。方法纳入2019年1—12月医院药房直接服务的临床患者220例作为对照组,2020年1—12月服务的临床患者220例作为研究组。对照组采用传统门诊药房药品调剂流程,研究组应用PFID技术优化后的调剂流程。对比两组门诊药房工作效率、药品调剂不合理率和患者满意度。结果研究组门诊药房调剂1张处方平均耗时、盘点所需耗时及患者平均等待时间较对照组均显著缩短,数据差异有统计学意义(t=25.112、65.216、44.927,P<0.05)。研究组调剂数量错误及调剂药品错误等情况发生频率明显少于对照组,数据差异有统计学意义(χ^(2)=21.689、12.712、36.332,P<0.05)。研究组患者满意度98.64%显著高于对照组83.64%,数据差异有统计学意义(χ^(2)=30.369,P<0.05)。结论基于RFID技术优化后的门诊药房药品调剂流程可显著提高门诊药房的工作效率,降低药品调剂不合理率,提高患者满意度,值得推广。

关键词： RFID   LDA   轨迹挖掘  

摘要： 射频识别(RFID)技术应用广泛,但移动对象RFID轨迹(RFID-STR)数据挖掘研究较少,不能体现数据的社会和应用价值。针对数据预处理难度大、缺乏有效语义轨迹挖掘方法、知识可视化技术少等问题,结合过程发现、LDA模型、聚类算法、轨迹数据可视化等技术,把RFID-STR数据映射到业务过程模型,提出基于LDA的RFID-STR数据特征知识提取方法,重点阐述RFID-STR数据挖掘方法的轨迹数据预处理、轨迹知识提取和知识可视化阶段。为解决RFID数据的轨迹搜索与分析技术提供新的技术途径。

关键词： RFID   低功耗   ⅡC接口   FPGA  

摘要： 针对于无源RFID数据存储的问题,提出了一种带有ⅡC接口的数字基带系统。该设计不仅完全兼容ISO 18000-6C协议,还采用了异步计数器、两级门控时钟、多时钟域等低功耗技术来满足设计的低功耗要求。利用Modelsim、QuartusⅡ软件以及DE2-115 FPGA开发板进行功能仿真与板级验证,通过ⅡC接口来读取板载存储器EEPROM,读取结果与预先存储的结果一致。采用SMIC 0.18工艺完成逻辑综合以及功耗分析,分析结果表明,电路总功耗为14.8μW,总面积为0.12mm^(2),满足设计需求。

关键词： 室内定位   动态定位   RFID   卡尔曼滤波   VIRE/POA融合  

摘要： 针对室内环境下机场行李在匀速和非匀速情况下的动态定位问题,本文首先对基于RFID的VIRE算法及POA定位算法原理进行阐述,然后对实际定位环境中VIRE定位算法及POA定位算法都存在的定位不准确、受环境影响较大等问题展开了研究。为了更好实现对行李的实时定位,本文对VIRE定位算法及POA定位算法进行改进,采用联合卡尔曼滤波算法将经典VIRE定位算法与改进的POA算法进行融合,并在MATLAB环境中进行对比,结果表明改进后的定位算法使定位误差减小,其平均定位精度提高28%。最后,在机场大件行李分拣操作场实验,验证了基于VIRE/POA融合的室内行李定位算法在动态定位中的有效性和可行性,实验表明在整个运动过程中该算法的定位更加准确且曲线轨迹更加平滑。

关键词： Distortion   Narrowband   Time-domain analysis   Resonant frequency   Time-frequency analysis   Receivers   Transceivers   Multiband carrier system   radio frequency identification (RFID)   time domain   ultrawideband (UWB) chipless tag  

摘要： We propose a new approach based on the multicarrier system, in which multiple narrowband pulses emit toward a chipless RFID tag in the UWB, to decode the tag in the time domain. The multicarrier system is known to be able to reduce complexity and interference, and also increase spectrum efficiency and flexibility. In this study, we not only experimentally investigate the backscattered signal of a frequency-coded chipless RFID tag interrogated by narrowband pulses, but we have also derived mathematical equations to describe the tag responses. We have found that the shape of the reflected response from the tag is determined by the emitted signal multiplied by a distortion factor. The distortion amount depends on transmitted signal bandwidth, tag quality factor, and resonance frequency. We further use the distorted tag response as a tag signature in the time domain for decoding purposes, eliminating the signal transformation to the frequency spectrum, which is one of the most time-consuming post-processing algorithms. To further demonstrate the performance of the proposed approach in a more realistic scenario, we have developed a customized multicarrier transceiver to decode a four-bit cross-polarized tag in the time domain. We have demonstrated that the proposed analytical approach can also enhance tag detection in a realistic environment with multiple parasitic reflections.

关键词： RFID   Wireless sensor   Internet of things   Deployment  

摘要： The trend of IoT brings more and more connected smart devices into our daily lives, which can enable a ubiquitous sensing and interaction experience. However, augmenting many everyday objects with sensing abilities is not easy. BitID is an unobtrusive, low-cost, training-free, and easy-to-use technique that enables users to add sensing abilities to everyday objects in a DIY manner. A BitID sensor can be easily made from a UHF RFID tag and deployed on an object so that the tag's readability (whether the tag is identified by RFID readers) is mapped to binary states of the object (e.g., whether a door is open or closed). To further validate BitID's sensing performance, we use a robotic arm to press BitID buttons repetitively and swipe on BitID sliders. The average press recognition F1-score is 98.9% and the swipe recognition F1-score is 96.7%. To evaluate BitID's usability, we implement a prototype system that supports BitID sensor registration, semantic definition, status display, and real-time state and event detection. Using the system, users configured and deployed a BitID sensor with an average time duration of 4.9 min. 23 of the 24 users deployed BitID sensors worked accurately and robustly. In addition to the previously proposed 'short' BitID sensor, we propose new 'open' BitID sensors which show similar performance as 'short' sensors.

关键词： Internet of things  

摘要： With the development of society and the increment of human needs, many new technologies have been produced. The mobile RFID system has gradually approached the scene view of humans—the wire communication between reader and database limits modern communication in a traditional RFID system. While wireless communication between these two characters can satisfy the need in a mobile RFID system, specific safety risk still exists. An ultra-lightweight two-way authentication protocol of mobile RFID system has been designed in this paper. The protocol is based on permutation cross synthesis operation, which is from bit operation to encrypt sent messages. Besides, permutation cross synthesis includes two steps, permutation operation, and cross synthesis operation. With Hamming Weights of encrypted messages, permutation and cross-location can be identified. Communication entities in this protocol are identified first before privacy information is exchanged. Meanwhile, one end of the reader stores the communication keys for the first and second rounds, harmonizing communication entities. Compared with other protocols of this type on safety and function, the protocol in this paper has characteristics of lower computation, higher safety performance, and higher applicability on mobile RFID systems © 2022. International Journal of Network *** Rights Reserved

关键词： Prosthetics   Surface cracks   Surface impedance   Radiofrequency identification   Sensors   Monitoring   Sensitivity   Crack detection   electronic skin   healthcare applications   implantable passive sensors   radio frequency identification   wireless prostheses  

摘要： Manufacturing faults and aging are the main causes for micro-crack generation in implanted prostheses. An early detection of surface defects by means of local sensors can prevent dangerous complications and prompt for a preventive replacement of the medical device. For this purpose, a tattoo-like sensing mechanism based on pre-fractal Space Fulling Curves is wrapped onto the medical device and coupled with a zero-power RFID transponder. The resulting smart prosthesis is capable to identify the early formation of cracks and to communicate with the exterior of the body by backscattering communication. The crack detection method exploits the anti-tamper port of common Radiofrequency Identification (RFID) ICs and a small antenna, acting as harvester, closely integrated with the metal prosthesis. Simulations and tests with a mockup of metallic hip prosthesis and a leg phantom demonstrate that the device can identify surface cracks as small as 0.6 mm and can be wireless interrogated outside the body from up to 70 cm distance. The required geometrical change to the prosthesis is modest and does not hinder its mechanical robustness. Experiments also confirmed that the health status of the prosthesis could be even monitored on-the-fly when the patient crosses a door equipped with a UHF reader. The sensorized prosthesis could hence become an enabler for the emerging Precision Medicine and for the Internet of Bodies paradigm.

关键词： railway   track switch and crossing   RFID technology   positioning system  

摘要： Currently, a number of positioning systems are in use to locate trains on the railway network;but these generally have limited precision. Thus, this paper focuses on testing and validating the suitability of radio frequency identification (RFID) technology, for aligning vehicles to switch and crossing (S&C) positions on the railway network. This offers the possibility of accurately knowing the position of vehicles equipped with monitoring equipment, such as the network rail track recording vehicle (TRV), and aligning the data with reference to the locations of the S&C (and ideally to key elements within a particular S&C). The concept is to install two tags, one on the switch-toe sleeper and the second on the crossing-nose sleeper, with an RFID reader that will be installed underneath the vehicle. Thus, the key features of the S&C, the switch toe and crossing nose, will be considered as a definitive reference point for the inspection vehicle's position. As a monitoring vehicle passes over a piece of S&C, the proposed positioning system will provide information about this S&C's ID, which is stored inside the RFID tags and will indicate the S&C's GPS coordinates. As part of the research in this paper, more than 400 tests have been performed to investigate two different RFID technologies, passive and semi-passive, tested in a variety of conditions: including different passage speeds, different distances between the RFID reader and the tags, and varied strength signal transmitted between the reader and the tags. Based on lab testing and analysis of the recorded data, it is concluded that passive RFID technology is the most suitable of the two technologies. The conclusions find that the proposed RFID-based solution can offer a more precise positioning solution to be a reference point for the train location within the network.

关键词： Chipless radio frequency identification (RFID) tag   fragment-type structure   multiobjective optimization   quick response (QR) code  

摘要： A design scheme for embedding a chipless radio frequency identification (RFID) tag in a quick response (QR) code is proposed and demonstrated. By searching for QR modules that can be metalized to form a loop resonator in the edge area and to load the loop in the central area, the chipless RFID tag with an optimized loaded-loop resonator can be designed in the QR code. A specific loop genetic operator is proposed for optimization searching. The optimized loaded-loop resonator has a sharp dominant resonant peak at frequency as low as possible and a harmonic resonant peak at frequency as high as possible, which provides large space for data encoding of chipless RFID. By removing or demetalizing the metalized loading modules, the resonant frequency can be tuned conveniently for frequency shift keying (FSK) coding. For demonstration, the chipless RFID tag embedded in the QR code is designed and tested. It is shown that the RFID tag allows at least nine distinct resonant frequencies for simple FSK coding, which indicates a coding capacity of 3.17 bits and a normalization coding density of approximately 501.78 bits/lambda(2)(g)/GHz for the chipless RFID tag embedded in the QR code.