教学课程资源库 更多>>

关键词： Smart city  

摘要： Underground water pipes are important to any country’s infrastructure. Overtime, the metallic pipes are prone to corrosion, which can lead to water leakage and pipe bursts. In order to prolong the service life of those assets, water utilities in Australia apply protective pipe linings. Long-term monitoring and timely intervention are crucial for maintaining those lining assets. However, the water utilities do not possess the comprehensive technology to achieve it. The main reasons for lacking such technology are the unavailability of sensors and accurate robot localization technologies. Feature based localization methods such as SLAM has limited use as the application of liners alters the features and the environment. Encoder based localization is not accurate enough to observe the evolution of defects over a long period of time requiring unique defect correspondence. This motivates us to explore accurate contact-less and wireless based localization methods. We propose a cost-effective localization method using UHF-RFID signals for robot localization inside pipelines based on Gaussian process combined particle filter. Experiments carried out in field extracted pipe samples from the Sydney water pipe network show that using the RSSI and Phase data together in the measurement model with particle filter algorithm improves the localization accuracy up to 15 centimeters precision. © 2021, CC BY.

关键词： Radio frequency identification (RFID)   CSRR   chipless   image theory   PMC  

摘要： A small structure for chipless RFID tag is proposed;it is inspired by a C-shaped structure and based on HCSRR. This structure has curved strips, which are obtained by fine cutting the substrate from the symmetry of the C-shaped structure as base structure, and then missing part of the path is compensated by creating the PMC boundary condition in the cut-off point according to the image theory. Hence, the resonant frequencies of the proposed structure remain the same as those of the base structure. The substrate is Rog4003 with epsilon(r)=3.55 and dimensions of 30x15x0.8 mm(3), the ratio of area to lambda for the first resonant in 2.4 GHz is 0.073, and the average distance between two resonances is 300 MHz Half the structure without adding any other element reduces the production cost by 50%. Moreover, the structure can be printed on flexible substrates due to its simple design and non-complexity.

摘要： Fresh products have a strong dependence on time and a large loss rate in the circulation process. Applying RFID technology to the supply chain of fresh products, through the real-time tracking technology, can not only reduce the products' time dependence but also realize the second order within the whole sales period. This paper takes a two-echelon fresh supply chain of a single fresh retailer as the research object, constructs a two-stage Newsvendor model with or without RFID technology, compares the difference in profits, and provides decision-making reference for fresh retailers whether to invest in RFID or not.

关键词： RFID   编码解码   调制解调  

摘要： 射频识别(RFID)技术是通过无线电进行数据交换从而达到信息识别的技术。该实验平台包含了原理机和应用机两大部分,原理机使用两FPGA小系统为核心,应用机使用ArduinoUNO控制,通过AndroidStudio编写手机终端Android程序,c#语言编写上位机软件,目的是为了让学生对实验原理有更深入的了解。

关键词： Mapping  

摘要： In recent years, Radio Frequency Identification (RFID) technology has been applied to improve numerous processes, such as inventory management in retail stores. However, automatic localization of RFID-tagged goods in stores is still a challenging problem. To address this issue, we equip fixtures (e.g., shelves) with reference tags and use data we collect during RFID-based stocktakes to map articles to fixtures. Knowing the location of goods enables the implementation of several practical applications, such as automated Money Mapping (i.e., a heat map of sales across fixtures). Specifically, we conduct controlled lab experiments and a case-study in two fashion retail stores to evaluate our article-to-fixture prediction approaches. The approaches are based on calculating distances between read event time series using DTW, and clustering of read events using DBSCAN. We find that, read events collected during RFID-based stocktakes can be used to assign articles to fixtures with an accuracy of more than 90%. Additionally, we conduct a pilot to investigate the challenges related to the integration of such a localization system in the day-to-day business of retail stores. Hence, in this paper we present an exploratory venture into novel and practical RFID-based applications in fashion retails stores, beyond the scope of stock management. © 2021, CC BY-NC-SA.

关键词： Internet of things  

摘要： With the increase in the number of tags, an efficient approach of tag identification is becoming an urgent need in Industrial Internet of Things (IIoT). However, the identification performance of existing Aloha-based anticollision schemes is limited when the initial frame size is seriously mismatched with the actual tag population size. The performance will degrade further when IIoT is deployed in the error-prone channel environment. To optimize the identification performance of RFID system in an error-prone channel environment, we propose an efficient early frame breaking strategy based anticollision algorithm (EFB-ACA) with channel awareness. The EFB-ACA divides the whole tag identification process into two phases: convergence phase and identification phase. The function of convergence phase is to make the adjusted frame quickly converge to an appropriate size. The early frame breaking strategy is embedded in the convergence phase. Numerical results show that the proposed EFB-ACA algorithm outperforms the other methods on efficiency and stability in the error-prone channel. In addition, EFB-ACA algorithm also outperforms the other methods in the error-free channel.

关键词： BIM   RFID技术   装配式   建筑施工   管理效率  

摘要： 从中国现在的建筑业发展情况来看,一些建筑依然采用传统的建造方式,而装配式建筑以其绿色化、低碳化等特点逐步成为发展趋势。在装配式建筑施工过程中将BIM和RFID技术充分利用起来,可以提高施工效率,对实现绿色施工起到一定的促进作用。通过研究表明,应用BIM和RFID技术可实现施工过程可视化模型化管理,最大限度地提升装配式建筑施工过程的管理效率。

关键词： Corrosion   Sensors   Steel   Dipole antennas   Antennas   Monitoring   Concrete   Corrosion monitoring   predictive maintenance   steel   concrete   RFID tags   microwave sensors  

摘要： Corrosion of reinforcing steel is the leading cause of deterioration in concrete and impacts strongly the safety and durability of civil infrastructures. It occurs in marine environment with the presence of chloride which breaks the thin oxide film passivation layer leading to dissolution. This research proposes an innovative embedded sensor in concrete for the detection of corrosion of steel. The autonomous UHF RFID (Ultra High Frequency Radio Frequency Identification) sensor is based on the coupling between the antenna of a dipolar RFID tag and a layer of steel exposed to chloride in concrete. Variation of the RSSI (Received Signal Strength Indication) measured by the reader localized in air has two origins, namely the degree of moisture of concrete and the presence of the steel layer. By minimizing the impact of seawater ingress on the antenna property, the presence of metallic films of few micrometers thickness can be detected. This authorizes the development of the proposed method for monitoring mass loss of steel in concrete.