IEEE Latin America Transactions最新文献_第3页

Learnable Query Contrast and Spatio-temporal Prediction on Point Cloud Video Pre-training 点云视频预培训的可学习查询对比度和时空预测

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-10-04 DOI: 10.1109/TLA.2024.10705970

Xiaoxiao Sheng;Zhiqiang Shen;Longguang Wang;Gang Xiao

{"title":"Learnable Query Contrast and Spatio-temporal Prediction on Point Cloud Video Pre-training","authors":"Xiaoxiao Sheng;Zhiqiang Shen;Longguang Wang;Gang Xiao","doi":"10.1109/TLA.2024.10705970","DOIUrl":"https://doi.org/10.1109/TLA.2024.10705970","url":null,"abstract":"Point cloud videos capture the time-varying environment and are widely used for dynamic scene understanding. Existing methods develop effective networks for point cloud videos but do not fully utilize the prior information uncovered during pre-training. Furthermore, relying on a single supervised task with a large amount of manually labeled data may be insufficient to capture the foundational structures in point cloud videos. In this paper, we propose a pre-training framework Query-CP to learn the representations of point cloud videos through multiple self-supervised pretext tasks. First, tokenlevel contrast is developed to predict future features under the guidance of historical information. Using a position-guided autoregressor with learnable queries, the predictions are directly contrasted with corresponding targets in the high-level feature space to capture fine-grained semantics. Second, performing only contrastive learning fails to fully explore the complementary structures and dynamics information. To alleviate this, a decoupled spatio-temporal prediction task is designed, where we use a spatial branch to predict low-level features and a temporal branch to predict timestamps of the target sequence explicitly. By combining the above self-supervised tasks, multi-level information is captured during the pre-training stage. Finally, the encoder is fine-tuned and evaluated for action recognition and dynamic semantic segmentation on three datasets. The results demonstrate the effectiveness of our Query-CP. Especially, compared with the state-of-the-art methods, the fine-tuning accuracy on action recognition improves by 3.23% for 24-frame point cloud videos, and the mean accuracy increases by 4.21%.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10705970","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142376682","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

Comparative Study of Tire Models Applied to Electronic Stability Control in Automotive Simulator 汽车模拟器中电子稳定性控制应用的轮胎模型比较研究

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-10-04 DOI: 10.1109/TLA.2024.10706024

Walter Paschoal;Igor Souza;Lucas Torres;Andre Murilo Pinto;Renan Ozelo

引用次数: 0

Comparison of sequential test strategies based on Monte Carlo simulations in the detection of auditory steady-state responses 基于蒙特卡罗模拟的顺序测试策略在听觉稳态反应检测中的比较

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-09-10 DOI: 10.1109/TLA.2024.10669254

Victor Hugo de Souza Ragazzi;Alexandre Gomes Caldeira;Patrícia Nogueira Vaz;Felipe Antunes;Leonardo Bonato Felix

{"title":"Comparison of sequential test strategies based on Monte Carlo simulations in the detection of auditory steady-state responses","authors":"Victor Hugo de Souza Ragazzi;Alexandre Gomes Caldeira;Patrícia Nogueira Vaz;Felipe Antunes;Leonardo Bonato Felix","doi":"10.1109/TLA.2024.10669254","DOIUrl":"https://doi.org/10.1109/TLA.2024.10669254","url":null,"abstract":"It is common to use sequential testing strategies to help reduce the time of automated detection of an auditory steady-state response (ASSR). However, the application of repeated tests leads to an increase of false positive rate. Monte Carlo-based strategies are used to overcome this obstacle. Despite several paper could be found describing such strategies, no comprehensive comparison was found in the literature. The chosen strategies are based on Monte Carlo simulations to calculate critical values and were faithfully replicated for comparison purposes, and then the test application parameters were varied to suggest an optimization. The detection rate and/or the detection speed improved with each implemented strategy, except for the one related to the year 2013, which increased the false positive rate to 15.3%. The other strategies kept the false positive rate under control. The Pareto curves compared the optimizations of the strategies and revealed that the modified 2015 strategy had the performance achieving 5.6% higher than the original parameters. The automated detection of ASSR improved with each implemented strategy, but not all of them kept a controlled false positive rate (2013 and 2015). The 2015 modified strategy had the highest detection rate in the shortest time.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10669254","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142165019","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

A prediction model for heat exchanger fouling factor based on stacking model 基于堆叠模型的换热器污垢系数预测模型

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-09-10 DOI: 10.1109/TLA.2024.10670205

Zhiping Chen;Yongle Meng;Haoshan Yu;Ruiqi Wang;Wenwu Zhou

{"title":"A prediction model for heat exchanger fouling factor based on stacking model","authors":"Zhiping Chen;Yongle Meng;Haoshan Yu;Ruiqi Wang;Wenwu Zhou","doi":"10.1109/TLA.2024.10670205","DOIUrl":"https://doi.org/10.1109/TLA.2024.10670205","url":null,"abstract":"Given the pressing demand for energy conservation, the petrochemical sector faces increasingly stringent energy-saving mandates. Heat exchangers, essential to this sector, suffer efficiency losses and increased energy consumption due to fouling. To ensure optimal operation of heat exchange systems, regular assessment of solid deposits and the implementation of cleaning schedules are imperative. However, the multitude of influencing factors renders traditional estimation methods unreliable. Consequently, we developed a stacking model to predict the fouling factor of heat exchangers. Specifically, we first constructed fouling factor prediction models using various machine learning techniques, then selected the best-performing models random forest, extreme gradient boosting , and light gradient boosting machine for integration. Finally, the predictions from these three models were fed into a linear regression layer to form the final stacking model. The results indicate that the constructed stacking model significantly enhances the accuracy of fouling factor prediction. This model not only surpasses traditional multilayer perceptron neural network methods but also outperforms the well-performing gaussian process regression. This achievement not only validates the effectiveness of our model but also provides robust support for future research and applications in related fields.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10670205","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142165018","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 enhancement of permanent magnet DC motor with sepic converter through higher order sliding surface 通过高阶滑动面提高带 SEPI 转换器的永磁直流电机的性能

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-09-09 DOI: 10.1109/TLA.2024.10670234

Dhanasekar Ravikumar;Ganesh Kumar Srinivasan;Marco Rivera

引用次数: 0

Methodology Using Idle Capacity of Hydroelectric Substations for Sizing Floating Photovoltaic Plants 利用水电站闲置容量确定浮动光伏发电站规模的方法学

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-09-06 DOI: 10.1109/TLA.2024.10669249

Breno Bezerra Freitas;Bruno Rodrigues Alves Bezerra;Carlos Alberto Teixeira Júnior;Celso Florindo de Oliveira Júnior;Dionízio Porfírio de Assis;Edvaldo de Sousa Queiroz Filho;Felipe Teles do Nascimento;Fernando Weslley Silva de Oliveira;Gabryel Ferreira Alves;João Victor Teixeira Alves;Marcos Felipe de Andrade Silva;Milton Cezar da Silva;Monilson de Sales Costa;Otacilio José de Macêdo Nunes;Paulo Cesar Marques de Carvalho;Rebeca Catunda Pereira

{"title":"Methodology Using Idle Capacity of Hydroelectric Substations for Sizing Floating Photovoltaic Plants","authors":"Breno Bezerra Freitas;Bruno Rodrigues Alves Bezerra;Carlos Alberto Teixeira Júnior;Celso Florindo de Oliveira Júnior;Dionízio Porfírio de Assis;Edvaldo de Sousa Queiroz Filho;Felipe Teles do Nascimento;Fernando Weslley Silva de Oliveira;Gabryel Ferreira Alves;João Victor Teixeira Alves;Marcos Felipe de Andrade Silva;Milton Cezar da Silva;Monilson de Sales Costa;Otacilio José de Macêdo Nunes;Paulo Cesar Marques de Carvalho;Rebeca Catunda Pereira","doi":"10.1109/TLA.2024.10669249","DOIUrl":"https://doi.org/10.1109/TLA.2024.10669249","url":null,"abstract":"Photovoltaic (PV) generation has emerged as an alternative for reducing environmental impacts. Recently, floating photovoltaic (FPV) configurations have gained popularity, utilizing the water surface of reservoirs as installation sites. Recognizing its potential, this paper proposes a methodology to harness the idle capacity of substation facilities in hydroelectric power plants (HPP) for sizing FPV plants, aiming for the maximal utilization of the substation's capacity and promoting complementarity with HPP generation. The study introduces a sizing proposal for FPV based on complementarity with the worst day of HPP generation within a defined period, aiming to utilize 100% of the substation's capacity. As a case study, the FPV potential is identified as 59.81 GWp for Belo Monte and 55.35 GWp for Itaipu. This approach seeks to enhance the overall efficiency and sustainability of power generation systems by integrating FPV with existing hydroelectric infrastructure.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10669249","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142143721","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

Assessment and Simulation of Strategies to Enhance Hosting Capacity and Reduce Power Losses in Distribution Networks 提高配电网托管能力和减少电力损耗策略的评估与模拟

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-09-06 DOI: 10.1109/TLA.2024.10669252

Ivo Benitez Cattani;Enrique Chaparro;Benjamin Baran

{"title":"Assessment and Simulation of Strategies to Enhance Hosting Capacity and Reduce Power Losses in Distribution Networks","authors":"Ivo Benitez Cattani;Enrique Chaparro;Benjamin Baran","doi":"10.1109/TLA.2024.10669252","DOIUrl":"https://doi.org/10.1109/TLA.2024.10669252","url":null,"abstract":"Distribution systems are increasingly experiencing the penetration of photovoltaic (PV) systems. Although PV penetration is beneficial up to a point, beyond that point, it begins to generate issues related to voltage levels and grid stability. In modern distribution system planning, it is essential to identify an optimal operational point where the integration of PV supports the voltage profile rather than causing any adverse effects. The purpose of this paper is to explore and evaluate strategies to enhance Hosting Capacity and reduce Power Losses in distribution systems through an optimization algorithm that iteratively uses power-flow simulations and a Multi-Objective Genetic Algorithm. Different strategies taking advantage of conventional distribution system assets are formulated to avoid new system reinforcement. The strategies include Network Reconfiguration, Capacitor Switching, On-Load Tap Changer Switching, Volt-VAR Control Settings and the Combination of all strategies. To evaluate the efficiency of each approach, a comprehensive simulation study is conducted on the IEEE 123 bus distribution system modeled in OpenDSS, with an algorithm created in Python to control the optimization process.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10669252","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142143585","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

Predictive Performance of Machine Learning Algorithms Regarding Obesity Levels Based on Physical Activity and Nutritional Habits: A Comprehensive Analysis 基于体育活动和营养习惯的机器学习算法对肥胖程度的预测性能：综合分析

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-09-06 DOI: 10.1109/TLA.2024.10669246

Paulo Henrique Ponte de Lucena;Lidio Mauro Lima de Campos;Jonathan Cris Pinheiro Garcia

引用次数: 0

Towards a Machine-Learning-Based Application for Amorphous Drug Recognition 开发基于机器学习的无定形药物识别应用程序

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-09-06 DOI: 10.1109/TLA.2024.10669245

Mateus Coelho Silva;Alcides Castro e Silva;Marcos T. D. Orlando;Vinicius D. N. Bezzon

{"title":"Towards a Machine-Learning-Based Application for Amorphous Drug Recognition","authors":"Mateus Coelho Silva;Alcides Castro e Silva;Marcos T. D. Orlando;Vinicius D. N. Bezzon","doi":"10.1109/TLA.2024.10669245","DOIUrl":"https://doi.org/10.1109/TLA.2024.10669245","url":null,"abstract":"The amorphous drug structure represents an important feature to be reached in the pharmaceutical field due to its possibility of increasing drug solubility, considering that at least 40% of commercially available crystalline drugs are poorly soluble in water. However, it is known that the amorphous local structure can vary depending on the amorphization technique used. Therefore, recognizing such variations related to a specific amorphization technique through the pair distribution function (PDF) method, for example, is an important tool for drug characterization concerns. This work presents a method to classify amorphous drugs according to their amorphization techniques and related to the local structure variations using machine learning. We used experimental PDF patterns obtained from low-energy X-rays scattering data to extract information and expanded the data through the Monte Carlo method to create a synthetic dataset. Then, we proposed the evaluation of such a technique using a Deep Neural Network. Based on the results obtained, it is suggested that the proposed technique is suitable for the amorphization technique and local structure recognition task.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10669245","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142143673","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

Compliance Analysis of Series Arc-fault in AFCI- Equipped Inverters in Accordance with IEC 63027 根据 IEC 63027 对配备 AFCI 的逆变器中的串联电弧故障进行符合性分析

IF 1.3 4区工程技术

IEEE Latin America Transactions Pub Date : 2024-09-06 DOI: 10.1109/TLA.2024.10669358

Filipe Ramos;Jose Neto;Fabio Almeida;Silvia Velázquez;Bruno Lima

{"title":"Compliance Analysis of Series Arc-fault in AFCI- Equipped Inverters in Accordance with IEC 63027","authors":"Filipe Ramos;Jose Neto;Fabio Almeida;Silvia Velázquez;Bruno Lima","doi":"10.1109/TLA.2024.10669358","DOIUrl":"https://doi.org/10.1109/TLA.2024.10669358","url":null,"abstract":"The National Institute of Metrology, Quality and Technology (Instituto Nacional de Metrologia, Qualidade e Tecnologia - INMETRO) introduces that, starting in 2024, all photovoltaic (PV) inverters sold in the Brazilian market must incorporate an Arc-Fault Circuit Interrupt (AFCI) function into their systems. These inverters are required to comply with the IEC 63027:2023 (Photovoltaic power systems DC arc detection and interruption) standard. Considering this, the Electrical Engineering Laboratory at Mackenzie Presbyterian University (Universidade Presbiteriana Mackenzie UPM) conducted a series of arc-faults tests on three inverters available in the market, following the IEC 63027 standard. Each of the three inverters underwent a total of 32 arcs, considering number of Maximum Power Point Tracking (MPPT) ports, different impedance topologies, arc position in the PV system, and maximum values of voltage and current. The experiments revealed that two of the three inverters are not capable of meeting the international standard for detecting and interrupting series arc-faults, highlighting the need evaluation of PV inverter sold in the Brazilian market. During the analysis, it was noted that for certain parameters proposed by IEC 63027, there is a gap of information regarding evaluation of the data relating to arc self-extinguish or actual AFCI intervention. It is show that this scenario can raise a concern: the possibility exists for an inverter meet the international standard without implementing an effective AFCI technology. The 96 tests conducted were compared in terms of arc detection time and arc energy. The data were analyzed and compared with respect to the phenomena of arc self-extinguishing and the operation of the AFCI. Suggestions for enhancements to the IEC 63027 standard were provided","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10669358","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142143660","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