2025
Authors
Pinto, P; Ferreira, I; Cerveira, A; Grasel, B; Baptista, J;
Publication
14th International Conference on Renewable Energy Research and Applications, ICRERA 2025
Abstract
The main objective of this work is to identify the most efficient methodologies for transmitting energy generated onshore to offshore gas extraction platforms. Initially, a case study was carried out to determine the most suitable transmission method, AC or DC, with DC being the most suitable. Subsequently, theoretical research was carried out into the type of cable that should be used in this project, resulting in static and dynamic cables. The authors also propose a mathematical optimization model to determine which type of cable section should be used, minimizing the installation cost, power losses and ensuring that the voltage drop is lower than the regulatory limits. Two scenarios were considered in this optimization, one taking power losses into account and the other not. A more positive result was found with the 1000 mm2 section cable, because even though the initial investment is higher, the financial return is superior. © 2025 IEEE.
2025
Authors
Antonio, V; Bronner, U; Nepstad, R; Oliveira, MA;
Publication
OCEANS 2025 BREST
Abstract
The application of digital twin technology to the ocean is often referred to as Digital Twins of the Ocean (DTO). One notable initiative funded under Horizon Europe programs - Green Deal is the ILIAD - Digital Twin of the Ocean project. One of the objectives of ILIAD is to establish interoperable, data-intensive, and cost-effective DTO pilots. This paper focuses on one such pilot dedicated to environmental monitoring and water quality assessment associated with the OceanLab infrastructure in the Trondheim Fjord, Norway. This paper outlines the architecture and concept of the pilot while providing detailed insights into its application for various what-if scenarios. The scenario presented in this paper is a case study that analyzes the impact of a hypothetical oil spill at the Trondheim terminal. It focuses on the spread of surface oil over a 30-hour period using various pilot modules. The paper also discusses the potential replication of this study in another geographical location.
2025
Authors
Caetano, E; MPM Oliveira, B; Correia, F; Torres, D; Poínhos, R;
Publication
Acta Portuguesa de Nutrição
Abstract
2025
Authors
Cerqueira, F; Ferreira, MC; Campos, MJ; Fernandes, CS;
Publication
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
Abstract
Background: The study aims to present and explain the development stages of a mobile app designed to improve health literacy for self-management of oncological diseases. Through the integration of gamification, the app aims to enhance patient engagement and education in an interactive manner. Methods: The methodology of Design Science in Information Systems and Software Engineering was employed, which included stages of needs identification, requirements definition, prototyping, and iterative validation of the developed artifact. A total of 132 participants, consisting of patients and healthcare professionals, were involved in the development of the PocketOnco application. The subsequent implementation of the App, PocketOnco, involved usability testing, System Usability Scale assessment, and the collection of qualitative feedback. Results: The usability testing analysis revealed excellent acceptance of PocketOnco, with the gamified elements such as quizzes and reward systems being particularly appreciated for their ability to consistently engage and motivate users. Conclusion: The various stages in the development of this resource ensure the quality of its purpose. The application proved to be a viable and attractive solution for both patients and healthcare professionals, suggesting a promising path for future digital interventions in the field of oncology.
2025
Authors
Nascimento, R; Ferreira, T; Rocha, CD; Filipe, V; Silva, MF; Veiga, G; Rocha, L;
Publication
JOURNAL OF INTELLIGENT & ROBOTIC SYSTEMS
Abstract
Quality inspection inspection systems are critical for maintaining product integrity. Being a repetitive task, when performed by operators only, it can be slow and error-prone. This paper introduces an automated inspection system for quality assessment in casting aluminum parts resorting to a robotic system. The method comprises two processes: filing detection and hole inspection. For filing detection, five deep learning modes were trained. These models include an object detector and four instance segmentation models: YOLOv8, YOLOv8n-seg, YOLOv8s-seg, YOLOv8m-seg, and Mask R-CNN, respectively. Among these, YOLOv8s-seg exhibited the best overall performance, achieving a recall rate of 98.10%, critical for minimizing false negatives and yielding the best overall results. Alongside, the system inspects holes, utilizing image processing techniques like template-matching and blob detection, achieving a 97.30% accuracy and a 2.67% Percentage of Wrong Classifications. The system improves inspection precision and efficiency while supporting sustainability and ergonomic standards, reducing material waste and reducing operator fatigue.
2025
Authors
Santos, F; Baptista, J; Pinto, T;
Publication
2025 IEEE International Conference on Environment and Electrical Engineering and 2025 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe)
Abstract
Artificial intelligence techniques offer promising potential for accurately predicting solar intensity, enabling more efficient management of renewable energy resources. This research addresses the main methods for predicting solar radiation using artificial intelligence techniques. Good solar radiation forecasting is crucial for the optimization of solar energy systems and for the efficient management of renewable energy resources. This study explores the use of different artificial intelligence (AI) methods, including Artificial Neural Networks (ANN), Support Vector Machines (SVM), decision trees, linear regression and fuzzy logic, to predict solar radiation based on meteorological data such as temperature, wind speed and direction, and solar radiation. The Mean Absolute Error (MAE), Root Mean Square Error (RMSE), and correlation coefficient are used to evaluate the performance of the various models tested. The results show that AI models, especially ANNs, outperform traditional solar radiation forecasting approaches in terms of accuracy and efficiency. © 2025 Elsevier B.V., All rights reserved.
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