IEEE Latin America Transactions最新文献_第7页

Time-series failure prediction on small datasets using machine learning 利用机器学习对小型数据集进行时间序列故障预测

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-04-15 DOI: 10.1109/TLA.2024.10500720

Caio Souto Maior;Thaylon Silva

{"title":"Time-series failure prediction on small datasets using machine learning","authors":"Caio Souto Maior;Thaylon Silva","doi":"10.1109/TLA.2024.10500720","DOIUrl":"https://doi.org/10.1109/TLA.2024.10500720","url":null,"abstract":"Condition-based maintenance is a decision-making strategy using condition monitoring information to optimize the availability of operational plants. In this context, machine learning techniques are useful and have been used in predicting the remaining useful life (RUL) of equipment to ensure the overall safety and reliability of the system through maintenance policies and, consequently, reducing costs arising from the failure. These databases are not large which is tricky for data-driven models. In this study, we consider five different databases containing the failure times from distinct real-world equipment. Here, four different regression algorithms were compared for RUL prediction, namely: Support Vector Regression (SVR), Decision Tree (DT), Multilayer Perceptron (MLP) and K-Nearest Neighbors (KNN). Furthermore, aiming to improve the data quality, the Empirical Mode Decomposition (EMD) was used, which is responsible for pre-processing the input data used on the predictive modeling. We optimize the models hyperparameters using grid-search cross-validation algorithm and the performance of each model is compared using the normalized root mean squared error (NRMSE). Considering the datasets analyzed, KNN model proves to be the most promising to perform the prognostic task in small datasets, adapting itself to the distinct characteristics of the different databases. In addition, we mention the better performance after optimizing the hyperparameters, which avoided overfitting problems and had a low computational cost for the problems analyzed here.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10500720","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140555844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance study of a photovoltaic system operating on the southeastern coast of Brazil 在巴西东南海岸运行的光伏系统性能研究

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-04-15 DOI: 10.1109/TLA.2024.10500721

Júlia de Oliveira Gonzalez;Fernando Ramos Martins

{"title":"Performance study of a photovoltaic system operating on the southeastern coast of Brazil","authors":"Júlia de Oliveira Gonzalez;Fernando Ramos Martins","doi":"10.1109/TLA.2024.10500721","DOIUrl":"https://doi.org/10.1109/TLA.2024.10500721","url":null,"abstract":"The photovoltaic (PV) solar energy generation sector is expanding fast and achieved 23.9 GW of installed power in Brazil in the first months of 2023 (occupying the 2nd place in installed capacity in the Brazilian electricity mix). Such a scenario makes PV power generation a resource for regional development and socioeconomic opportunities for metropolitan regions with a high national economy share and population density. The present work investigated how a PV systems performance is affected when operating in a coastal area close to high atmospheric particulate and gases emitters like cargo transportation and port operational procedures. The PV system is installed at the Federal University of Sao Paulo, campus Baixada Santista in Santos/SP, close to Latin Americas largest port in trade operations. Santos is a medium-sized coastal city with a tropical climate, dry winters, and humid summers. The evaluation is based on a database including environmental and operational quantities acquired between October/2020 and September/2021 to calculate the fundamental performance metrics: performance ratio, capacity factor, reference and final yields, and system losses. The performance parameters were analogous to published results achieved by PV systems worldwide in coastal and continental areas. The PV system performance at Unifesps Building rooftop was not affected by regional climate and local atmospheric conditions related to the nearby polluting economic activities, including emissions of gases and particulates into the atmosphere. Finally, the PV system showed better performance than that simulated by the SOLergo tool regarding the generated energy, probably due to the influence of local environmental variables and careful operational maintenance not considered in the numerical simulations.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10500721","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140555817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

switch placement algorithm to reduce the impact of distribution network maintenance in continuity indexes 减少连续性指数中配电网维护影响的交换机放置算法

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-04-15 DOI: 10.1109/TLA.2024.10500712

Armando Leopoldo Keller;Rodrigo Figueiredo;Sandro José Rigo

引用次数: 0

Evaluating the 2PC Algorithm for the Maintenance of P2P Live Streaming 评估用于维护 P2P 实时流的 2PC 算法

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-04-15 DOI: 10.1109/TLA.2024.10500714

Adriel C. dos Santos;Iago A. Carvalho;Cristiano M. Silva;Eliseu C. Miguel

{"title":"Evaluating the 2PC Algorithm for the Maintenance of P2P Live Streaming","authors":"Adriel C. dos Santos;Iago A. Carvalho;Cristiano M. Silva;Eliseu C. Miguel","doi":"10.1109/TLA.2024.10500714","DOIUrl":"https://doi.org/10.1109/TLA.2024.10500714","url":null,"abstract":"Peer-to-Peer (P2P) Networks for live streaming face challenges such as ensuring low latency and low discontinuity in media transmission among peers. Algorithms for constructing and maintaining the overlay are often proposed to address several of these challenges. However, it is common to find works that present positive results from the execution of these algorithms without showing the overlay structure constructed by them. In this article, we analyze the overlay constructed and maintained by the Peer Classification for Partnership Constraints (2PC) algorithm. 2PC proved to be efficient in dealing with a large number of free-riders on the network, imposing constraints on partnerships between peers according to their contributions to media transmission. To understand the 2PC execution effects supported by the K-Shortest Path Yen's algorithm, we evaluated the application of the 2PC and identified that the partnership relationships between peers imposed by the algorithm organize the overlay attracting high-contribution peers close to the server, while pushing low-contribution peers to the edge of the overlay.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10500714","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140555845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Table of Contents May 2024 目录 2024 年 5 月

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-04-15 DOI: 10.1109/TLA.2024.10500716

引用次数: 0

Technique to Generate Depth Maps from Real Scenes without Manual Calibration 无需手动校准即可从真实场景生成深度图的技术

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-04-15 DOI: 10.1109/TLA.2024.10500710

Ricardo S. Casado;Carlos W. Carvalho;Marcio M. Fernandes;Emerson C. Pedrino

引用次数: 0

Performance Enhancement of Reduced Component Multilevel Inverter with Optimal Placement of Level Shifter 通过优化电平转换器的位置提高低元件多电平逆变器的性能

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-03-20 DOI: 10.1109/TLA.2024.10534310

VIJAYARAJA L;Ganesh Kumar S;Marco Rivera;Ebrahim Babaei

{"title":"Performance Enhancement of Reduced Component Multilevel Inverter with Optimal Placement of Level Shifter","authors":"VIJAYARAJA L;Ganesh Kumar S;Marco Rivera;Ebrahim Babaei","doi":"10.1109/TLA.2024.10534310","DOIUrl":"https://doi.org/10.1109/TLA.2024.10534310","url":null,"abstract":"Multi-Level Inverter (MLI) with and without cross-connecting switches is constructed using bi-directional and uni-directional switches and their performances are verified via a real-time experimentation. Here, a cross connecting switch inverter (CCSI) is constructed and then cross connecting switches in CCSI are removed for the modified inverter (MMLI) with reduction of switches. Further, the CCSI and MMLI configuration is studied with the identification of optimal placement of the level shifter circuit in the basic unit and different types of procedures for the design of voltage sources that are used in the inverter to enhance the performance is proposed. The best method of defining the value of voltage sources among the proposed nine different algorithms a 31-level CCSI, a 49 level and 71 level MMLI are designed and tested experimentally. Efficiency, total blocking voltage, harmonic presence, real and reactive powers are obtained for the proposed converters to study their performance. Finally, a comparative analysis is made for the proposed structure against the other MLI in-term of switch count, ON state switches, voltage sources and efficiency.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10534310","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141073597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An experimental alternative of microwave signal generation through an optical heterodyning technique using a multimode laser diode and a tunable DFB laser 通过使用多模激光二极管和可调谐 DFB 激光器的光异调技术生成微波信号的实验替代方案

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-03-20 DOI: 10.1109/TLA.2024.10534302

Ignacio Enrique Zaldívar-Huerta;Blaise Tshibangu Mbuebue;Alejandro García-Juárez;Edgard-Yvon Tshishimbi Kanyinda;Roberto Rojas-Laguna;Min Won Lee

{"title":"An experimental alternative of microwave signal generation through an optical heterodyning technique using a multimode laser diode and a tunable DFB laser","authors":"Ignacio Enrique Zaldívar-Huerta;Blaise Tshibangu Mbuebue;Alejandro García-Juárez;Edgard-Yvon Tshishimbi Kanyinda;Roberto Rojas-Laguna;Min Won Lee","doi":"10.1109/TLA.2024.10534302","DOIUrl":"https://doi.org/10.1109/TLA.2024.10534302","url":null,"abstract":"It is experimentally demonstrated as an alternative to one of the classical optical heterodyning techniques for generating microwave (MW) signals. The originality of this work resides in the use of a Multimode Laser Diode (MLD) associated with a Fiber Bragg Grating (FBG) and a tunable Distributed Feedback laser (DFB), instead of two DFBs. As an optical filter, the FBG selects a single mode among various provided by the MLD signal. The selected single-mode signal is used as a reference in the optical beating together with the signal of the tunable DFB. The tunability is achieved by varying the DFB wavelength to modify the wavelength spacing () between the two optical signals. The experimental results are corroborated with those obtained theoretically and by simulations. The system performance evaluation is achieved through the Signal-to-Noise Ratio (SNR) and the Phase Noise (PN) measurements","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10534302","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141073633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Selection of Power Semiconductor Devices for a Standalone System based on Power Loss Analysis 基于功率损耗分析为独立系统选择功率半导体器件

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-03-20 DOI: 10.1109/TLA.2024.10534300

Leandro Leysdian Oro Carralero;Edemar de Oliveira Prado;André Pires Nóbrega Tahim;Fabiano Fragoso Costa;José Renes Pinheiro

{"title":"Selection of Power Semiconductor Devices for a Standalone System based on Power Loss Analysis","authors":"Leandro Leysdian Oro Carralero;Edemar de Oliveira Prado;André Pires Nóbrega Tahim;Fabiano Fragoso Costa;José Renes Pinheiro","doi":"10.1109/TLA.2024.10534300","DOIUrl":"https://doi.org/10.1109/TLA.2024.10534300","url":null,"abstract":"This paper presents a comprehensive methodology for the selection of power semiconductor devices in a standalone photovoltaic (PV)-battery system (SPBS) based on power loss analysis. The SPBS configuration is modeled analytically, and the waveforms for the system are obtained in a Hardware-In-the-Loop (HIL) and by simulation environment using Matlab. The study focuses on identifying the most cost-effective power semiconductor devices by assessing power loss at three distinct operating points. The algorithm evaluates losses in each component, facilitating the selection of optimal devices for enhanced system performance. The evaluation is performed for different operational modes, incorporating worst-case scenarios for current and voltage, providing a robust analysis of system behavior. By emphasizing the importance of power loss analysis in isolated PV systems, this research contributes to the advancement of energy efficiency in SPBS. The proposed methodology enables the identification of power semiconductor devices experiencing the highest losses, aiding in the selection of components that minimize overall losses and maximize energy utilization from PV panels and batteries.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10534300","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141073599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Table of Contents June 2024 目录 2024 年 6 月

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-03-20 DOI: 10.1109/TLA.2024.10534303

引用次数: 0