IEEE Latin America Transactions最新文献_第6页

Enhanced YOLOv8 for Detecting Multiple Defects on Bridge Surfaces 增强的YOLOv8用于检测桥梁表面上的多个缺陷

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2025-06-20 DOI: 10.1109/TLA.2025.11045669

Ruiping Li;Linchang Zhao;Hao Wei;Bocheng OuYang;Bing Fang;Yongchi Xu;Guoqing Hu

{"title":"Enhanced YOLOv8 for Detecting Multiple Defects on Bridge Surfaces","authors":"Ruiping Li;Linchang Zhao;Hao Wei;Bocheng OuYang;Bing Fang;Yongchi Xu;Guoqing Hu","doi":"10.1109/TLA.2025.11045669","DOIUrl":"https://doi.org/10.1109/TLA.2025.11045669","url":null,"abstract":"With the advancement of machine vision, numerous models have been created to detect imperfections in bridges. However, the bulk of these models are designed for single defect detection and are not adept at managing cases with concurrent multiple defects. As a result, quickly recognizing the array of defects on bridge surfaces is still a major obstacle. In response to this challenge, the current research introduces the YOLOv8-CBAM-Wise-IoU model, specifically crafted for the detection of seven distinct bridge surface defect categories. This model integrates the CBAM mechanism for focusing attention and the Wise-IoU for calculating loss, with its effectiveness measured by metrics including accuracy, retrieval rate, F1 measure, and mAP50. Rigorous ablation analyses and benchmarking against both single-tier and multi-tier deep learning frameworks were performed to substantiate the models utility. The YOLOv8-CBAM-Wise-IoU model exhibited formidable performance, recording an accuracy rate of 97.9%, a retrieval rate of 76%, an F1 measure of 58%, an mAP50 of 55.4%, and an mAP50-95 of 32.4%. These results outstrip those of standard models and other ablation variations, emphasizing the models ability to boost the precision and robustness of detecting various defect types on bridge surfaces. Code is available at https://github.com/IamSunday/Enhanced-YOLOv8-for-Detecting-Multiple-Defects-on-Bridge-Surfaces.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":"23 7","pages":"546-555"},"PeriodicalIF":1.3,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11045669","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144331814","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

Brazilian Stock Market Forecast with Heterogeneous Data Integration for a Set of Stocks 一组股票异质数据整合的巴西股市预测

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2025-06-20 DOI: 10.1109/TLA.2025.11045642

Michele Jackeline Andressa Rosa;Marcos Roberto Souza;Carlos Leandro Silva Machado;Sandro José Rigo;Jorge Luis Victória Barbosa

{"title":"Brazilian Stock Market Forecast with Heterogeneous Data Integration for a Set of Stocks","authors":"Michele Jackeline Andressa Rosa;Marcos Roberto Souza;Carlos Leandro Silva Machado;Sandro José Rigo;Jorge Luis Victória Barbosa","doi":"10.1109/TLA.2025.11045642","DOIUrl":"https://doi.org/10.1109/TLA.2025.11045642","url":null,"abstract":"The significant growth of the Brazilian stock market, coupled with the increase in investors in riskier assets, has generated a demand for automated forecasting tools. This research investigated the behavior and movement of stocks in the Brazilian market by integrating historical price series and textual data extracted from sentiments in X old Twitter messages and news collected from Google News. The analysis used natural language processing techniques for sentiment analysis, enabling an efficient fusion between numerical and textual information. Experiments were carried out with the assets PETR4, VALE3, BBDC4, and ITUB4, applying the Long Short Term Memory, Deep Neural Network, and Linear Regression models to predict the behavior of these assets. The results indicated that the LSTM models, especially Model 2, presented the best performance in terms of predictive capacity, with the lowest values of RMSE 0.0171 and high values of coefficint of determination ranging from 0.9707 to 0.9873. The study concludes that integrating numerical and textual data, combined with deep learning techniques, offers a promising approach to stock market forecasting, increasing forecasting gains.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":"23 7","pages":"572-583"},"PeriodicalIF":1.3,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11045642","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144331817","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

Compact 4-Port MIMO Antenna-Diplexer Utilizing Slotted-HMSIW Technology 紧凑的4端口MIMO天线双工器利用开槽hmsiw技术

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2025-06-20 DOI: 10.1109/TLA.2025.11045644

Divya Chaturvedi;Tiruganesh Lanka;Arvind Kumar

{"title":"Compact 4-Port MIMO Antenna-Diplexer Utilizing Slotted-HMSIW Technology","authors":"Divya Chaturvedi;Tiruganesh Lanka;Arvind Kumar","doi":"10.1109/TLA.2025.11045644","DOIUrl":"https://doi.org/10.1109/TLA.2025.11045644","url":null,"abstract":"A new design for a 4-port multiple input multiple output (MIMO) self-diplexing antenna is introduced, utilizing half-mode substrate integrated waveguide (SIW) technology. This antenna operates simultaneously at 4.9 GHz for WLAN and 5.8 GHz for ISM band communications, maintaining an isolation of approximately 30 dB. By employing the half-mode topology, the antenna size is reduced by 50% while preserving the dominant mode TE110 characteristics. To enhance bandwidth, a rectangular slot is etched at the centre of each cavity, splitting the dominant mode into odd-TE110 and even-TE110 modes. Through careful optimization of antenna parameters and the perpendicular placement of radiating elements for different frequencies, the design ensures self-diplexing property. To validate the design, a prototype of the antenna is manufactured, and experimental results are verified with simulations. The proposed antenna demonstrates a peak gain of 5.2 dBi in the lower-frequency band and 5.9 dBi in the upper-frequency band, with a high efficiency exceeding 94% in both of the frequency bands. Additionally, all MIMO-diversity parameters were found to be within satisfactory limits.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":"23 7","pages":"628-635"},"PeriodicalIF":1.3,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11045644","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144331816","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

Dosimetry Strategies for Non-Autonomous UV-C Robots 非自主UV-C机器人的剂量学策略

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2025-06-20 DOI: 10.1109/TLA.2025.11045646

Maikel Roberto Siqueira Gambetá-Leite;Rodrigo Araujo Real;Chiara das Dores do Nascimento;Everton Granemann Souza

{"title":"Dosimetry Strategies for Non-Autonomous UV-C Robots","authors":"Maikel Roberto Siqueira Gambetá-Leite;Rodrigo Araujo Real;Chiara das Dores do Nascimento;Everton Granemann Souza","doi":"10.1109/TLA.2025.11045646","DOIUrl":"https://doi.org/10.1109/TLA.2025.11045646","url":null,"abstract":"This study aimed to evaluate the coverage and disinfection effectiveness of SIDUV-C, a non-autonomous UV-C robot operating at a wavelength of 254 nm and a power output of 3900 W, which made it the most powerful in its category. Experimental methods included the determination of UV irradiation doses, UV-Vis spectral analysis, and modeling of irradiance fields to estimate the systems ability to deliver adequate doses of UV energy to target surfaces or airborne pathogens. Commercially available dosimetric films sensitive to UV-C radiation were employed to quantify doses across different spatial regions, and their accuracy was validated against UV spectroradiometry techniques and microbiological assays with methicillin-resistant Staphyloccoccus aureus (MRSA). The results demonstrated that both dosimetric films and spectroradiometer measurements consistently indicated the robot's rapid and effective disinfection performance across an unshaded area of 12.25 m2. The doses delivered were sufficient to neutralize a wide range of bacterial species commonly found in hospital environments across Latin America, including multidrug-resistant pathogens, thus underscoring the potential of UV-C disinfection robots as a critical tool in mitigating antimicrobial resistance in healthcare settings.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":"23 7","pages":"619-627"},"PeriodicalIF":1.3,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11045646","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144331819","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

Analysis and study of complete and incomplete combustion in a internal combustion engine using different amounts of biogas 使用不同量的沼气对内燃机完全燃烧和不完全燃烧的分析和研究

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2025-04-22 DOI: 10.1109/TLA.2025.10974370

Andrea Elizabeth Pérez;Erik Zamora Gomez;Giorgiy Polupan

引用次数: 0

Evaluating Robustness and Reliability of a C-NIDS for IoT Networks in Virtualized Environments 虚拟环境下物联网网络C-NIDS的鲁棒性和可靠性评估

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2025-04-22 DOI: 10.1109/TLA.2025.10974426

Agnaldo Batista;Carlos Pedroso;Samuel Brísio;Guilherme Rodrigues;Aldri Santos

{"title":"Evaluating Robustness and Reliability of a C-NIDS for IoT Networks in Virtualized Environments","authors":"Agnaldo Batista;Carlos Pedroso;Samuel Brísio;Guilherme Rodrigues;Aldri Santos","doi":"10.1109/TLA.2025.10974426","DOIUrl":"https://doi.org/10.1109/TLA.2025.10974426","url":null,"abstract":"Protecting thousands of smart devices across multiple IoT domains requires robust and collaborative security solutions, such as Collaborative Network Intrusion Detection Systems (C-NIDS). In this context, collaboration among NIDS improves intrusion detection by sharing information about local threats. However, most current solutions neglect the reliability and robustness assessment of these systems, especially when we consider C-NIDS. Thus, the lack of standardized and robust assessments to measure the reliability and accuracy of C-NIDS in attacks detection results in significant uncertainties regarding their ability to correctly identify threats. In this paper, we present an evaluation of a collaborative NIDS that integrates standalone NIDS to share information about detected and mitigated threats, improving overall intrusion detection. The evaluation took place in a virtualized IoT environment and results showed that collaborative NIDS detected DDoS attacks with an accuracy of at least 99.94%, a minimum recall of 99.94%, a precision of 100%, and F1 score of 1 in all evaluated scenarios. Such results highlight the development and adoption of uniform evaluation criteria to ensure the effectiveness and reliability of C-NIDS.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":"23 5","pages":"363-370"},"PeriodicalIF":1.3,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10974426","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860807","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

Compact Ultra-Wide-Stopband Microwave Bandpass Filter with Multiple Transmission Zeros by Integrating an L-Shaped Bandpass Filter and a Stepped Impedance Lowpass Filter 集成l型带通滤波器和阶跃阻抗低通滤波器的紧凑超宽阻带微波带通滤波器

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2025-04-22 DOI: 10.1109/TLA.2025.10974366

Ramkumar S;Anitha M;Boopathi Rani R;Muthuramya C

{"title":"Compact Ultra-Wide-Stopband Microwave Bandpass Filter with Multiple Transmission Zeros by Integrating an L-Shaped Bandpass Filter and a Stepped Impedance Lowpass Filter","authors":"Ramkumar S;Anitha M;Boopathi Rani R;Muthuramya C","doi":"10.1109/TLA.2025.10974366","DOIUrl":"https://doi.org/10.1109/TLA.2025.10974366","url":null,"abstract":"A compact ultra-wide-stopband microwave bandpass filter is introduced in this work using an L-shaped quarter-wavelength resonator and stepped impedance resonators. The bandpass filter (BPF-I) is designed at 2.1 GHz (f) using an L-shaped quarter-wavelength line. The lowpass filter is developed at 4 GHz using stepped impedance resonators. The introduced ultra-wide-stopband filter is created through integrating the BPF-I and the lowpass filter. Filter size reduction is achieved through the L-shaped quarter-wavelength line, while the ultra-wide-stopband is attained through the stepped impedance resonators. The mathematical analysis of the introduced ultra-wide-stopband bandpass filter is conducted through the extraction of ABCD and S-parameters. The lumped elements equivalent circuits are realized for the introduced filter, and their S-parameters are plotted. The introduced filter is fabricated on an FR4 substrate, and its S-parameters are measured. The comparison of mathematical analysis, EM simulated, circuit simulated, and measured results, showing good agreement. Measurements show a 140.4% fractional bandwidth (FBW), better than 20 dB return loss, higher than 28 dB rejection up to 30 GHz (14.3f) in the out-of-band with many transmission zeros, and 0.8 dB insertion loss. 0.23g x 0.37g is the overall dimension of the introduced filter.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":"23 5","pages":"437-443"},"PeriodicalIF":1.3,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10974366","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860784","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 Aggregator-Based Market Modelling with an Impact of Risk Under Uncertainty 基于聚合器的市场建模与不确定性下的风险影响

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2025-04-22 DOI: 10.1109/TLA.2025.10974375

Pavani Thallapally;Debasmita Panda

{"title":"An Aggregator-Based Market Modelling with an Impact of Risk Under Uncertainty","authors":"Pavani Thallapally;Debasmita Panda","doi":"10.1109/TLA.2025.10974375","DOIUrl":"https://doi.org/10.1109/TLA.2025.10974375","url":null,"abstract":"In the Electricity market the increased penetration of renewable energy sources (RES) and associated uncertainties impose challenges to determine the day-ahead distribution locational market prices effectively and also these uncertainties can jeopardize grid stability and reliability. RES aggregators compete to increase their profit but their intermittent nature adds financial risks to aggregators (As). The main objective of this paper is to model a day-ahead electricity market by considering RES aggregators as participants to trade energy effectively to maintain a dynamic energy balance. Instead of relying on existing probabilistic forecast methods to account for the variable uncertain nature of RES, this paper uses a novel data-driven forecasting method to predict variable RES power generation accurately. The proposed model follows a three stage approach. The first stage involves forecasting PV and wind output power with multiple scenarios. In the second stage, a scenario-based multi-aggregator market modelling is performed where aggregators submit their bids to the distribution network operator, who then clears the market by generating price signals. Uncertainties of RES aggregators lead to financial risk for aggregators. Hence, the third stage involves, risk assessment using value at risk (VaR) and conditional value at risk (CVaR) are applied to different scenarios for evaluating the potential portfolio losses within a specified time horizon and confidence level. To evaluate the effectiveness of the proposed model, it is tested on a modified 33-bus test system which shows effective energy trading at a distribution system with a considerable marginal range of voltage violations. The proposed novel three-stage model aims to improve the distribution level electricity markets efficiency and reliability, benefiting RES market participants and consumers alike.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":"23 5","pages":"415-426"},"PeriodicalIF":1.3,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10974375","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860808","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

Design of a Transformerless DC Regulator with Reduced Redundant Power Processing for a Residential DC Microgrid 为住宅直流微电网设计减少冗余功率处理的无变压器直流稳压器

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2025-04-22 DOI: 10.1109/TLA.2025.10974364

Iván Alfonso Reyes-Portillo;Saúl Rolando Méndez-Elizondo;Jorge Alberto Morales-Saldaña;Claudia Angélica Rivera-Romero;Dora Luz Castro-López

引用次数: 0

Enhancing Cu2ZnSnS4 Solar Cell Efficiency through Antimony Substitution for Tin: A SCAPS-1D Simulation Study 用锑取代锡提高Cu2ZnSnS4太阳能电池效率：SCAPS-1D模拟研究

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2025-04-22 DOI: 10.1109/TLA.2025.10974365

Sushmita Chaudhari;Kannan P.K.

{"title":"Enhancing Cu2ZnSnS4 Solar Cell Efficiency through Antimony Substitution for Tin: A SCAPS-1D Simulation Study","authors":"Sushmita Chaudhari;Kannan P.K.","doi":"10.1109/TLA.2025.10974365","DOIUrl":"https://doi.org/10.1109/TLA.2025.10974365","url":null,"abstract":"SCAPS-1D, a one-dimensional solar cell simulator, provides a valuable tool for predicting device performance based on layer-by-layer material properties. Copper Zinc Tin Sulfide (CZTS) has emerged as a promising absorber material due to its exceptional light absorption coefficient and the abundance and non-toxic nature of its constituent elements. This study leverages SCAPS-1D to investigate the working mechanism of CZTS-based solar cells. We simulate a Mo/CZTS/CdS/ZnO device structure under AM 1.5 spectrum illumination and 300 K temperature, analyzing the impact of individual layer thickness on photovoltaic performance. Further, a comparative analysis explores the influence of various n-type materials.. In addition, the introduction of antimony (Sb) doping into CZTS leads to a significant change in efficiency of the cell. The efficiency of Sbdoping CZTS attained 21.90%, while there was a great improvement by 3% via reduced recombination losses and enhanced photocurrent. This work gives an insight into the possibility of Sb doping for the improvement in the performance of thin-film solar cells.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":"23 5","pages":"380-386"},"PeriodicalIF":1.3,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10974365","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143860804","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