教学课程资源库 更多>>

关键词： Radiofrequency identification   Frequency division multiaccess   Throughput   Complexity theory   Frequency conversion   Time division multiple access   Heuristic algorithms   Interference cancellation   Systems architecture   UHF antennas   Frequency division multiple access (FDMA)   radio-frequency identification (RFID)   successive interference cancellation (SIC)  

摘要： As the use of ultrahigh frequency (UHF) radio-frequency identification (RFID) increases in various fields requiring the rapid identification of a large number of tags, research has shifted toward improving the access capacity of RFID systems. This article proposes a frequency division multiple access (FDMA) extension of conventional time division multiple access (TDMA) RFID systems by modulating tag signals to different Miller-subcarrier frequencies, achieving a theoretical throughput limit value of 0.9135 average successfully read tags per slot, which is 2.48 times that of the usually referred dynamic frame-slotted Aloha algorithm. The power spectral density (PSD) of Miller-modulated subcarrier (MMS) sequences is derived to uncover the tag interference caused by the modulation signal sidelobe power within each subchannel. After that, a successive interference cancellation (SIC) scheme is employed in a four-tag signal reception situation, enhancing the simultaneous tag replies interference suppression and achieving a small performance deterioration if compared with a conventional TDMA system. An experimental analysis is also described to show the feasibility of the proposed FDMA extension of TDMA-based UHF RFID systems.

关键词： Sewer monitoring   UHF-RFID sensors   Blockage detection   Inflow and infiltration   Water level measurement   Flow velocities  

摘要： Sewer blockages and inflow-and-infiltration (I/I) pose significant challenges to aging urban infrastructure, often leading to sewage overflows and environmental contamination with human pathogens. Conventional detection methods, including ultrasonic sensors, CCTV, infra-red cameras, and fiber-optic distributed temperature sensing systems, are costly, labor-intensive, and limited in scalability. This study introduces the use of ultra-high frequency radio frequency identification (UHF-RFID)-based sensors for real-time monitoring of water levels and surface flow velocities in simulated sewer systems, offering a novel, robust, and cost-effective solution for detecting sewer blockages and I/I events. To achieve this, we developed a UHF-RFID water depth ruler that demonstrated a near-identical accuracy to conventional point gauges (R-2 > 0.998) in various flow conditions. Additionally, our custom-designed UHF-RFID-based floating sensors accurately quantify a wide range of surface velocities under turbulent conditions (up to 72 L/s) in a controlled flume environment. By correlating surface flow velocity and water depth profiles, we could accurately identify blockage severity and detect point source I/I events in real-time within an open channel flume. The findings highlight UHF-RFID sensors as a low-cost, robust, and high-throughput tool for continuous sewer monitoring. Their scalability and ease of deployment make them ideal for integration into complex smart sewer infrastructure, significantly enhancing buried asset management. This research presents an innovative advancement in sewer monitoring technology, offering municipalities a scalable and efficient approach to maintaining the health and functionality of urban sewer networks while mitigating the risks of overflows and environmental pollution.

关键词： Fish passage   road-watercourse intersections   barrier mitigation   RFID  

摘要： The passage efficiency of brown trout through a 73 m long culvert equipped with 10 notched baffles, was studied using PIT telemetry and two approaches: (1) fish translocation from upstream to downstream of the culvert, (2) monitoring of the natural migration of downstream individuals. The migration rate of translocated individuals was higher (90%) than that of naturally migrating individuals (42%). The attraction efficiency was assessed at 94.4% and 93.1%, the passage efficiency at 94.7% and 83.3%, and the overall passage efficiency at 89.4% and 77.6% for translocated and naturally migrating individuals respectively. The majority of individuals passed through the culvert (overall passage time) fairly rapidly but the approach times were longer for translocated individuals, impacting their overall passage times (median value 24 h 40 min vs. 11 h 16 min for naturally migrating fish). For translocated fish, large individuals crossed the structure faster than small ones. For fish in natural migration, individuals that passed through the structure were smaller than those that did not. For translocated fish only, the approach time decreased with increasing water level. The majority of trout approached the culvert during the day and the luminosity changes at its entrance and exit did not seem to be a limiting factor for their passage.

关键词： RFID   Internet-of-Things   energy harvesting   wireless sensing   machine learning  

摘要： This paper presents a Virtualized Computational Radio Frequency Identification (VCRFID) solution that utilizes far-field UHF RF for sensing, computing, and self-powering at the edge. A standard UHF RFID system is asymmetric as it consists of a relatively large, complex "reader", which acts as an RF transmitter and controller for a number of small simple battery-less "tags", which work in passive mode as they communicate and harvest RF energy from the reader. Previously proposed Computational RFID (CRFID) solutions enhance the standard RFID tags with microcontrollers and sensors in order to gain enhanced functionality, but they end up requiring a relatively high level of power, and thus ultimately reduced range, which limits their use for many Internet-of-Things (IoT) application scenarios. Our VCRFID solution instead keeps the functionality of the tags minimalistic by only providing a sensor interface to be able to capture desired environmental data (temperature, humidity, vibration, etc.), and then transmit it to the RFID reader, which then performs all the computational load usually carried out by a microcontroller on the tag in prior work. This virtualization of functions enables the design of a circuit without a microcontroller, providing greater flexibility and allowing for wireless reconfiguration of tag functions over RF for a 97% reduction in energy consumption compared to prior energy-harvesting RFID tags with microcontrollers. The target application is Industry 4.0 where our VCRFID solution enables battery-less fine-grain monitoring of vibration and temperature data for pumps and motors for predictive maintenance scenarios.

关键词： RFID Technology   Digital Supply Chain   Socio-technology System Theory   Systematic Literature Review  

摘要： This paper conducts a systematic literature review of 109 peer-reviewed articles to examine the socio-technical factors shaping the implementation of Radio Frequency Identification (RFID) in supply chain management. Guided by socio-technical systems theory, the study categorizes the findings into social and technical subsystems and identifies seven key synergy mechanism factor that underpin successful deployment. The results show that challenges related to strategic decision-making, cultural adaptability, privacy, system integration, and cost-effectiveness plays a significant role in determining implementation outcomes. The study offers a novel socio-technical framework for understanding RFID adoption and contributes to theory by highlighting the interplay between human and technological dimensions. Practical implications are discussed for integrated system design and strategic planning, alongside research limitations and suggestions for future studies.

关键词： 射频识别   循环旁通工具   堵漏工具   室内试验   现场试验   新疆油田  

摘要： 针对当前机械式堵漏工具井下开关次数受限、端口过流面积小等功能局限性问题，突破井下工具非接触、无限级控制技术瓶颈，设计研制了一种具有自主知识产权的射频识别(RFID)循环旁通工具，由RFID通信系统、供电系统、液压控制系统、机械执行系统等组成，可开关次数大于30次，旁通过流面积为常规工具的5倍以上，可做到内部全通径，并在百口泉bDT23012井、新疆油田HW1250井累计现场试验4井次，验证了工具的整体可靠性。应用结果表明：RFID循环旁通工具可打破国际油服公司对高端随钻循环旁通工具的垄断，提升工具稳定性和可靠性，提升随钻堵漏、大排量洗井作业技术水平，满足特殊地质条件、特殊工况、特殊钻具结构随钻堵漏作业需求，并与机械式堵漏工具形成系列化产品。

关键词： 高速公路收费站   电子信息系统   RFID技术   图像识别技术  

摘要： 随着高速公路网络的日益完善,收费站作为高速公路网络的重要组成部分,其运行效率和服务质量对提升交通通行能力至关重要。本文旨在探讨高速公路收费站中电子信息系统的设计与应用,通过对系统功能性需求和非功能性需求的分析,设计了包含车辆识别、计费管理、数据存储与管理、监控与报警以及客户服务与交互等功能的电子信息系统。该系统采用 RFID 技术、图像识别技术、数据库技术和网络通信技术,实现了高效、安全、智能的收费站管理。

关键词： 行政事业单位   RFID技术   固定资产  

摘要： 近年来,行政事业单位的固定资产规模不断扩大,资产管理难度持续增加,传统的人工盘点方式效率低下,账实不符问题突出,严重制约了单位资产管理的效率与准确性。因此,探索利用新兴技术改进资产管理模式,逐步实现资产全生命周期的智能化、数字化管理,已成为当前行政事业单位亟须解决的重要课题。射频识别(radio frequency identification,RFID)技术作为一种成熟的信息技术,因其独特的优势在固定资产管理领域展现出良好的应用前景。

关键词： RFID技术   技术创新   芯片   产业合作   中世发  

摘要： “用中国芯,造世界标”,中世发以技术创新与产业合作实现从传统标签企业到科技型生产企业的蜕变。当下,物联网蓬勃发展,无线射频识别(RFID)技术作为物联网的关键支撑——感知层,正发挥着举足轻重的作用。而芯片作为RFID标签的核心组件,其重要性不言而喻。过去,RFID芯片市场长期被国外企业主导,我国RFID产业发展道路上横亘着“技术封锁”与“高昂成本”两座大山。在这条征途中,广东中世发智能科技股份有限公司(以下简称中世发)践行“用中国芯,造世界标”的理念,深耕技术创新与产业合作,实现从传统标签企业到科技型生产企业的华丽转身。

关键词： 变压器   质量追溯   全要素标识   信息融合机制   RFID技术  

摘要： 为满足变压器生产车间智能制造需求,研究通过分析某变压器生产制造车间的生产制造流程,构建了变压器生产车间全要素标识数据质量追溯系统。同时对变压器生产车间制造流程进行了分析,并从数字化车间信息模型构建、信息融合机制、系统实现等方面入手,探讨了一种变压器制造追溯系统的体系架构;研究了变压器生产车间数字化模型指标体系的构建及融合方法;提出了一种基于复合物元可拓的变压器生产车间全要素信息数据模型,实现了生产车间运行信息的数字化管理;然后,采用Java编程技术以及Hadoop平台开发了变压器生产车间质量追溯系统;最后,采用系统性能测试软件对所开发的系统信息追溯进行验证,结果表明主导资源平均算法能够在保证响应时间的同时提升吞吐率,能够满足质量追溯需求。研究可为工业产品质量追溯提供理论借鉴与参考。