{"title":"Clustered Orienteering Problem with Function-Based Rewards","authors":"Vinícius Leite Censi Faria;Douglas Guimarães Macharet","doi":"10.1109/TLA.2025.11007194","DOIUrl":"https://doi.org/10.1109/TLA.2025.11007194","url":null,"abstract":"The Orienteering Problem is a well-studied problem that aims to determine an optimal route that maximizes the cumulative rewards while attaining a predefined travel budget. This classical formulation has been generalized in many forms, including grouping customers (locations) into clusters. However, such cluster-based formulation typically demands visiting all customers to collect the reward, thereby restricting its applicability. In this paper, we introduce a novel variant in which rewards associated with a cluster can be partially collected following a function that correlates with the number of customers attended within the cluster. This new formulation is a suitable alternative to model scenarios where the reward of the clusters can exhibit distinct and unique scaling patterns. We propose using an evolutionary algorithm to solve this problem and evaluate its performance considering different scenarios and aspects. The results demonstrate that our method effectively selects an appropriate number of clients to attend to based on the assigned function for each cluster.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":"23 6","pages":"472-478"},"PeriodicalIF":1.3,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11007194","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090771","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}
{"title":"Analysis of Kinetic Energy Recovery System Based on Four-Phase Interleaved Buck Converter for Vehicle Verification Processes","authors":"Iván Alfonso Reyes-Portillo;Abraham Claudio-Sánchez;Saúl Rolando Méndez Elizondo;Dora Luz Castro-López;Luis Guillermo Carreto-Hernández","doi":"10.1109/TLA.2025.11007189","DOIUrl":"https://doi.org/10.1109/TLA.2025.11007189","url":null,"abstract":"The automotive industry consumes large amounts of fossil fuels during vehicle acceleration and braking tests as part of quality verification. The kinetic energy generated in the test rollers is typically wasted during vehicle braking. One approach to reducing vehicle production costs and improving the efficiency of fossil fuel consumption is to recover a fraction of this energy using a system that does not interfere with vehicle verification standards. The recovered energy can be stored or used for other essential functions, such as powering lighting systems. In industrial processes, electrical energy is the most common form of energy recovery due to its advantages in storage, distribution, and transformation for various applications. This paper presents the analysis of a kinetic energy recovery system (KERS) based on a four-phase interleaved Buck converter for vehicle testing processes. A stage by stage analysis of the energy recovery system is provided, along with the selection of system parameters. Furthermore, the advantages of the proposed topology and the experimental results are discussed.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":"23 6","pages":"527-536"},"PeriodicalIF":1.3,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11007189","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090752","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}
Xu Lu;Zexiao Cai;Xiongwei Huang;Cheng Zhou;Jun Liu
{"title":"AFERSM-Net: Joint Network for Gesture Recognition and Location Classification","authors":"Xu Lu;Zexiao Cai;Xiongwei Huang;Cheng Zhou;Jun Liu","doi":"10.1109/TLA.2025.11007187","DOIUrl":"https://doi.org/10.1109/TLA.2025.11007187","url":null,"abstract":"With the widespread deployment of wireless communication systems and smart devices, gesture recognition and indoor location classification technologies based on WiFi wireless devices are increasingly used. Its technical principle is to identify human activities and locations by extracting gesture and location features from WiFi channel state information (CSI). However, the signal is susceptible to interference from the environment during CSI data acquisition to produce multipath effect noise, and the amplitude change with the change of location often affects the extraction and recognition of gesture features. To address these problems, Auxiliary Feature Extraction based Residual Shrinkage Multi-tasking Network (AFERSM-Net) is proposed for gesture recognition and position classification of one-dimensional multivariate time series. AFERSM-Net is a hybrid architecture that combines CNN for spatial feature extraction and LSTM networks for capturing temporal dependencies. Firstly, a reasonable threshold is set adaptively by the shrinkage module to dynamically identify and eliminate the transformed environmental noise. Secondly, the feature extraction module is used to focus on and extract location-independent gesture features to reduce the influence of location-independent features. Finally, the gesture features extracted by the feature extraction module are fused with the shared features of the residual shrinkage multi-tasking network as an aid. Its module fusion is mainly used to improve the accuracy of gesture recognition and solve the problem of insufficient model generalization ability. We evaluated this network on a dual-labeled gesture and location dataset, an the gesture recognition accuracy was 97.84% and the location classification accuracy was 98.92%, which outperformed other advanced network frameworks.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":"23 6","pages":"462-471"},"PeriodicalIF":1.3,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11007187","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090761","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}
Pablo Raul Yanyachi;Luis F. Canaza Ccari;Daniel Yanyachi
{"title":"A Cooperative Control Approach for Multi-quadrotor Formation in Agricultural Scenarios with Obstacles and External Disturbances","authors":"Pablo Raul Yanyachi;Luis F. Canaza Ccari;Daniel Yanyachi","doi":"10.1109/TLA.2025.11007192","DOIUrl":"https://doi.org/10.1109/TLA.2025.11007192","url":null,"abstract":"This research aims to develop a robust cooperative control approach for the flight formation of multiple quadrotors in trajectory tracking tasks in agricultural scenarios with obstacles and external disturbances. For this purpose, a distributed autonomous control framework is proposed that integrates a guidance system and an advanced control system for each quadrotor under a leader-follower control scheme. The guidance system employs the Artificial Potential Field (APF) algorithm, which guarantees attraction to the target while avoiding obstacles. For the control system, a distributed consensus protocol based on an Adaptive Integral Fast Terminal Sliding Mode Control (AIFTSMC) is implemented, ensuring fast convergence and robust tracking of the reference trajectory, maintaining the alignment of the quadrotors throughout the entire flight mission. The validity of the proposed approach has been demonstrated through numerical simulations performed in Matlab/Simulink, implementing a representative agricultural scenario. The results show that the approach offers robust and efficient performance for multiple quadrotor flight formation in agricultural environments, even in the presence of external disturbances and obstacles.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":"23 6","pages":"508-517"},"PeriodicalIF":1.3,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11007192","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090772","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}
{"title":"Design and Simulation of a Sliding Mode Control for Anesthesia","authors":"Jesica Escobar;Ana Gabriela Gallardo Hernández;Antonio López-Ramírez","doi":"10.1109/TLA.2025.11007193","DOIUrl":"https://doi.org/10.1109/TLA.2025.11007193","url":null,"abstract":"This work presents the automation of the anesthesia infusion process, which allows us to respond quickly, safely and efficiently to possible emergencies that may arise during a surgical intervention. The design of the controller is specific for the infusion of Propofol, which is one of the most used anesthetics. The Higher Order Sliding Mode Control (HOSMC) technique is used, this technique was chosen, since the controller is designed only with the relative degree of the system, its notable characteristic of being insensitive to variations Parametric means that it can have the same efficiency for any patient regardless of the patient's age, sex, weight, height, illness, hydration level, which are important parameters that anesthesiologists consider to calculate the drug dose. Due to the above, its operation is faster compared to that of an anesthesiologist when an accident occurs. HOSMC is a robust controller, since when the patient reaches the desired anesthetic depth, the controller maintains the patient within that level, or within the allowable range even in the presence of surgical perturbations. To simulate the operation of the designed controller, Simulink from Matlab was used, where the controller was programmed.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":"23 6","pages":"537-544"},"PeriodicalIF":1.3,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11007193","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090773","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}
Cristian Hernández García;Juan Segundo Ramírez;Nancy Visairo Cruz;Jesús Camarillo Montero
{"title":"Short-Circuit Performance of a Synchronverter-Based Microgrid","authors":"Cristian Hernández García;Juan Segundo Ramírez;Nancy Visairo Cruz;Jesús Camarillo Montero","doi":"10.1109/TLA.2025.10930376","DOIUrl":"https://doi.org/10.1109/TLA.2025.10930376","url":null,"abstract":"Replacing synchronous generators with inverters in power grids reduces system inertia. To address this issue, the synchronconverter has been proposed as an alternative solution. This paper presents a comparative analysis of the dynamic and steady-state responses of an AC microgrid interconnected to the grid during three-phase and single-phase short-circuit events, while progressively replacing inverters with synchronverters. The results obtained show that with the incorporation of inverters with this function, the frequency deviations are smaller, the frequency oscillations are slower and the steady-state error decreases. This is compared to a system with only inverters with a conventional control law. The case study consisting of a microgrid with three inverters and interconnected to the grid was implemented in Matlab/Simulink.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":"23 4","pages":"329-338"},"PeriodicalIF":1.3,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10930376","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645243","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}
Minerva Guadalupe Vázquez Domínguez;Juan Gerardo Ávalos Ochoa;Juan Carlos Sánchez García;Brayans Becerra Luna
{"title":"Spectral coherence as a method for evaluating adaptive filtering techniques in photoplethysmography","authors":"Minerva Guadalupe Vázquez Domínguez;Juan Gerardo Ávalos Ochoa;Juan Carlos Sánchez García;Brayans Becerra Luna","doi":"10.1109/TLA.2025.10930368","DOIUrl":"https://doi.org/10.1109/TLA.2025.10930368","url":null,"abstract":"In this study, we introduce a method that utilizes spectral coherence as a metric for assessing the restoration of the photoplethysmographic (PPG) pulse signal morphology when filtering myokinetic noise using adaptive filtering techniques. Unlike other approaches that simply focus on detecting peaks and valleys after filtering, our research concentrates on recovering most of the components of the PPG pulse curve, as these reveal highly important information about cardiovascular health status, and which is essential for a proper diagnosis. To record PPG signals, a photoplethysmography system was placed on both hands of the subjects. On one hand, a three-axis accelerometer was also attached to capture the myokinetic motion, while the other hand remained stationary, allowing the PPG system to record a motion-free signal. After capturing the PPG signals with and without motion, we conducted an analysis by calculating the spectral coherence of the contaminated and recovered signals after adaptive filtering. We compared noisy PPG signals with the reference signal (myokinetic motion-free PPG signal). Based on the spectral coherence criterion, the affine projection algorithm and the variable step-size affine projection algorithm were found to be the most effective for filtering a PPG signal contaminated by myokinetic noise, achieving similarity scores of 94.25% and 94.67%, respectively, between the filtered signal and the motion-free pulse signal.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":"23 4","pages":"274-284"},"PeriodicalIF":1.3,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10930368","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637916","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}
{"title":"A new solution based on multi-objective algorithm for multi-application mappings for Many-Core systems","authors":"Manoel de Almeida;Emerson Pedrino;Igor Gallon","doi":"10.1109/TLA.2025.10930369","DOIUrl":"https://doi.org/10.1109/TLA.2025.10930369","url":null,"abstract":"In the current context of intelligent systems and big data, specifically concerning high-performance and efficient data processing for streams applications, single-core systems can no longer meet this demand. Increasing their operating frequencies would result in higher energy consumption for the chip as a whole. Thus, in this scenario, multicore and manycore chips appear to be a viable solution. However, distributing mono8 application or multi-application tasks on these devices is not trivial in practice. It is necessary to consider heat dissipation effects throughout the system while simultaneously ensuring fault tolerance and good load balancing. Although there is not yet a considerable number of works in the literature addressing the allocation of multi-applications in NoCs, there are many works focusing on mapping mono-applications. Therefore, this article proposes a multi-objective mapping model that focuses on performance metrics and heat distribution for multi-applications in manycores with NoCs, aiming to contribute in this direction. The results found are compared with the state-of-the-art algorithm in this scenario, showing promise for the field, with improvements of more than 30% in latency and 38% in fault tolerance when all applications are taken into account.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":"23 4","pages":"323-328"},"PeriodicalIF":1.3,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10930369","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637879","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}
Mohammad Joshan;Jose Hiroki Saito;Emerson Carlos Pedrino
{"title":"Improved Parallel Algorithm for Finding Minimum Cuts in Stochastic Flow Networks","authors":"Mohammad Joshan;Jose Hiroki Saito;Emerson Carlos Pedrino","doi":"10.1109/TLA.2025.10930375","DOIUrl":"https://doi.org/10.1109/TLA.2025.10930375","url":null,"abstract":"This article solves the convergence problem in the Parallel BK algorithm for large-scale flow networks. We introduce a merging method and a pseudo-Boolean representation-based invariance analysis that optimize the algorithm's performance compared to classical approaches such as Ford-Fulkerson, Edmonds-Karp, Push-Relabel, and Kargers Algorithm. Our approach improves energy efficiency, reduces memory usage, and lowers time complexity by leveraging parallelization techniques. We evaluate the performance of these algorithms using Python simulations on various benchmark graphs, ranging from small to large-scale networks. The results show that our method reduces memory consumption by up to 40% and speeds up execution time by 30%, while maintaining high accuracy in finding minimum cuts. This paper demonstrates the algorithm's potential for applications in image segmentation, wireless sensor networks, and network reliability analysis","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":"23 4","pages":"285-293"},"PeriodicalIF":1.3,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10930375","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637962","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}
{"title":"FreeRTOS Application in a Real-Time Air Quality Monitoring Architecture for Smart Campus","authors":"Elton Alves;Noedson Silva;Warley Júnior;Alife Moraes;Nandson Silva;Andson Balieiro","doi":"10.1109/TLA.2025.10930347","DOIUrl":"https://doi.org/10.1109/TLA.2025.10930347","url":null,"abstract":"Monitoring air quality in smart campuses is essential for safeguarding the health of the academic community, as air pollution in university environments can lead to respiratory and cardiac issues. While the Internet of Things (IoT) offers a suitable solution for monitoring and notifying about air quality in smart campuses, it is of paramount importance that these notifications occur in real-time to ensure information reaches users with minimal latency. This paper presents an architecture for collecting, storing, and notifying about atmospheric pollutants in a smart campus and analyzes the use of Real-Time Operating Systems (RTOS) for managing the system. The evaluation focuses on IoT technologies, represented by the end node, gateway, and cloud server. The experimental results show that using RTOS reduces the average transmission interval by 37.5% and achieves higher transmission and reception throughput compared to non-real-time operating systems. For instance, in a monitored location, the transmission and reception throughput reached approximately 178.23 and 164.18 with RTOS, compared to 110.97 and 99.41 without RTOS, respectively.","PeriodicalId":55024,"journal":{"name":"IEEE Latin America Transactions","volume":"23 4","pages":"266-273"},"PeriodicalIF":1.3,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10930347","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637971","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}