2024
Autores
Vasiljevic, I; Music, J; Lima, J;
Publicação
Communications in Computer and Information Science
Abstract
The article provides a comparison of Convolutional Neural Network (CNN) and Reinforcement Learning (RL) applied to the field of autonomous driving within the CARLA (CAr Learning to Act) simulator for training and evaluation. The analysis of results revealed CNNs better overall performance, as it demonstrated a more refined driving experience, shorter training durations, and a more straightforward learning curve and optimization process. However, it required data labelling. In contrast, RL relayed on an exhaustive (unsupervised) exploration of different models, ultimately selecting the model at timestep 600,000, which had the highest mean reward. Nevertheless, RL’s approach revealed its susceptibility to excessive oscillations and inconsistencies, necessitating additional optimization and tuning of hyperparameters and reward functions. This conclusion is further substantiated by a range of used performance metrics (objective and subjective), designed to assess the performance of each approach. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.
2024
Autores
Mendes, J; Silva, AS; Roman, FF; de Tuesta, JLD; Lima, J; Gomes, HT; Pereira, AI;
Publicação
OPTIMIZATION, LEARNING ALGORITHMS AND APPLICATIONS, PT II, OL2A 2023
Abstract
This study focuses on the analysis of emulsion pictures to understand important parameters. While droplet size is a key parameter in emulsion science, manual procedures have been the traditional approach for its determination. Here we introduced the application of YOLOv7, a recently launched deep-learning model, for classifying emulsion droplets. A comparison was made between the two methods for calculating droplet size distribution. One of the methods, combined with YOLOv7, achieved 97.26% accuracy. These results highlight the potential of sophisticated image-processing techniques, particularly deep learning, in chemistry-related topics. The study anticipates further exploration of deep learning tools in other chemistry-related fields, emphasizing their potential for achieving satisfactory performance.
2022
Autores
Dias, Paloma; Brito, Thadeu; Lopes, Luís; Lima, José;
Publicação
2nd Symposium of Applied Science for Young Researchers - SASYR
Abstract
Monitoring and controlling the energy consumption of electrical appliances brings
significant benefits to both consumers and the energy utility. This work presents a system for
monitoring and controlling energy consumption by residence loads connected to smart plugs.
The user will have a tool to view consumption information and remotely turn loads on and off,
as well as control the power level at which certain appliances will operate. In addition, it is
intended to give the system the ability to make decisions regarding the operation of electrical
devices based on the electrical energy available. This decision-making can occur either through
priorities established by the user or, possibly, through Machine Learning applied to the system,
based on the consumption pattern. Solutions like these can even be applied in situations where
the user produces his own energy and would like to use the surplus produced to meet certain
loads.
2023
Autores
Kaizer, R; Sestrem, L; Franco, T; Gonçalves, J; Teixeira, J; Lima, J; Carvalho, J; Leitão, P;
Publicação
Proceedings of the 16th International Joint Conference on Biomedical Engineering Systems and Technologies
Abstract
2021
Autores
Sestrem, L; Kaizer, R; Goncalves, J; Leitao, P; Teixeira, JP; Lima, J; Franco, T; Carvalho, JA;
Publicação
PROCEEDINGS OF THE 15TH INTERNATIONAL JOINT CONFERENCE ON BIOMEDICAL ENGINEERING SYSTEMS AND TECHNOLOGIES (BIODEVICES), VOL 1
Abstract
Data acquisition by electromyography, as well as the muscle stimulation, has become more accessible with the new developments in the wearable technology and medicine. In fact, for treatments, games or sports, it is possible to find examples of the use of muscle signals to analyse specific aspects related, e.g., to disease, injuries or movement impulses. However, these systems are usually expensive, does not integrate data acquisition with the muscle stimulation and does not exhibit an adaptive control behaviour that consider the pathology and the patient response. This paper presents a wearable system that integrates the signal acquisition and the electrostimulation using dry thin-film titanium-based electrodes. The acquired data is transmitted to a mobile application running on a smartphone by using Bluetooth Low Energy (BLE) technology, where it is analysed by employing artificial intelligence algorithms to provide customised treatments for each patient profile and type of pathology, and taking into consideration the feedback of the acquired electromyography signal. The acquired patient's data is also stored in a secure cloud database to support the physician to analyse and follow-up the clinical results from the rehabilitation process.
2020
Autores
yahia, a; Pereira, AI; Lima, J; Ferreira, A; Boukli-Hacene, F; Abdelfettah, K;
Publicação
Abstract
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