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Publicações

2025

End-to-End Occluded Person Re-Identification With Artificial Occlusion Generation

Autores
Capozzi, L; Cardoso, JS; Rebelo, A;

Publicação
IEEE ACCESS

Abstract
In recent years, the task of person re-identification (Re-ID) has improved considerably with the advances in deep learning methodologies. However, occluded person Re-ID remains a challenging task, as parts of the body of the individual are frequently hidden by various objects, obstacles, or other people, making the identification process more difficult. To address these issues, we introduce a novel data augmentation strategy using artificial occlusions, consisting of random shapes and objects from a small image dataset that was created. We also propose an end-to-end methodology for occluded person Re-ID, which consists of three branches: a global branch, a feature dropping branch, and an occlusion detection branch. Experimental results show that the use of random shape occlusions is superior to random erasing using our architecture. Results on six datasets consisting of three tasks (holistic, partial and occluded person Re-ID) demonstrate that our method performs favourably against state-of-the-art methodologies.

2025

Mobile health applications for the rehabilitation of people with spinal cord injury: a scoping review

Autores
Mota, A; Ferreira, MC; Fernandes, CS;

Publicação
DISABILITY AND REHABILITATION-ASSISTIVE TECHNOLOGY

Abstract
BackgroundIndividuals with spinal cord injury (SCI) face complex and ongoing rehabilitation needs. In this context, mobile health applications have emerged as promising tools to support self-management and rehabilitation.ObjectiveTo map and characterize mobile applications specifically developed to support rehabilitation of individuals with SCI.MethodsA scoping review was conducted in accordance with PRISMA-ScR guidelines. A systematic search was performed across five electronic databases (PubMed, Scopus, Web of Science, and CINAHL). Studies published between 2015 and 2024 describing the use of mobile applications in the rehabilitation of adults with SCI were included.ResultsA total of 24 studies were included. We synthesized the identified applications descriptively into four domains: self-management and health education; gamification and motivation for physical rehabilitation; monitoring and prevention of secondary complications; and assistive technology and advanced rehabilitation. A consistent adoption of user-centered design principles was observed. Despite high levels of reported usability, challenges remain regarding long-term engagement, technological complexity, and sustained adherence.ConclusionMobile applications represent a promising complementary resource to support rehabilitation and health management in individuals with SCI. However, more robust longitudinal studies with larger sample sizes are required to assess the clinical impact and long-term feasibility of these interventions.

2025

Editorial: Hemodynamic parameters and cardiovascular changes

Autores
Pereira, T; Gadhoumi, K; Xiao, R;

Publicação
FRONTIERS IN PHYSIOLOGY

Abstract
[No abstract available]

2025

Disentanglement and Assessment of Shortcuts in Ophthalmological Retinal Imaging Exams

Autores
Fernandes, L; Gonçalves, T; Matos, J; Nakayama, LF; Cardoso, JS;

Publicação
Fairness of AI in Medical Imaging - Third International Workshop, FAIMI 2025, Held in Conjunction with MICCAI 2025, Daejeon, South Korea, September 23, 2025, Proceedings

Abstract
Diabetic retinopathy (DR) is a leading cause of vision loss in working-age adults. While screening reduces the risk of blindness, traditional imaging is often costly and inaccessible. Artificial intelligence (AI) algorithms present a scalable diagnostic solution, but concerns regarding fairness and generalization persist. This work evaluates the fairness and performance of image-trained models in DR prediction, as well as the impact of disentanglement as a bias mitigation technique, using the diverse mBRSET fundus dataset. Three models, ConvNeXt V2, DINOv2, and Swin V2, were trained on macula images to predict DR and sensitive attributes (SAs) (e.g., age and gender/sex). Fairness was assessed between subgroups of SAs, and disentanglement was applied to reduce bias. All models achieved high DR prediction performance in diagnosing (up to 94% AUROC) and could reasonably predict age and gender/sex (91% and 77% AUROC, respectively). Fairness assessment suggests disparities, such as a 10% AUROC gap between age groups in DINOv2. Disentangling SAs from DR prediction had varying results, depending on the model selected. Disentanglement improved DINOv2 performance (2% AUROC gain), but led to performance drops in ConvNeXt V2 and Swin V2 (7% and 3%, respectively). These findings highlight the complexity of disentangling fine-grained features in fundus imaging and emphasize the importance of fairness in medical imaging AI to ensure equitable and reliable healthcare solutions. © 2025 Elsevier B.V., All rights reserved.

2025

An Actor-Critic-based adapted Deep Reinforcement Learning model for multi-step traffic state prediction

Autores
Reza, S; Ferreira, MC; Machado, JJM; Tavares, JMRS;

Publicação
APPLIED SOFT COMPUTING

Abstract
Traffic state prediction is critical to decision-making in various traffic management applications. Despite significant advancements in Deep Learning (DL) models, such as Long Short-Term Memory (LSTM), Graph Neural Networks (GNN), and attention-based transformer models, multi-step predictions remain challenging. The state-of-the-art models face a common limitation: the predictions' accuracy decreases as the prediction horizon increases, a phenomenon known as error accumulation. In addition, with the arrival of non-recurrent events and external noise, the models fail to maintain good prediction accuracy. Deep Reinforcement Learning (DRL) has been widely applied to diverse tasks, including optimising intersection traffic signal control. However, its potential to address multi-step traffic prediction challenges remains underexplored. This study introduces an Actor-Critic-based adapted DRL method to explore the solution to the challenges associated with multi-step prediction. The Actor network makes predictions by capturing the temporal correlations of the data sequence, and the Critic network optimises the Actor by evaluating the prediction quality using Q-values. This novel combination of Supervised Learning and Reinforcement Learning (RL) paradigms, along with non-autoregressive modelling, helps the model to mitigate the error accumulation problem and increase its robustness to the arrival of non-recurrent events. It also introduces a Denoising Autoencoder to deal with external noise effectively. The proposed model was trained and evaluated on three benchmark traffic flow and speed datasets. Baseline multi-step prediction models were implemented for comparison based on performance metrics such as Mean Absolute Error (MAE) and Root Mean Squared Error (RMSE). The results reveal that the proposed method outperforms the baselines by achieving average improvements of 0.26 to 21.29% in terms of MAE and RMSE for up to 24 time steps of prediction length on the three used datasets, at the expense of relatively higher computational costs. On top of that, this adapted DRL approach outperforms traditional DRL models, such as Deep Deterministic Policy Gradient (DDPG), in accuracy and computational efficiency.

2025

Does Every Computer Scientist Need to Know Formal Methods?

Autores
Broy, M; Brucker, AD; Fantechi, A; Gleirscher, M; Havelund, K; Kuppe, MA; Mendes, A; Platzer, A; Ringert, JO; Sullivan, A;

Publicação
FORMAL ASPECTS OF COMPUTING

Abstract
We focus on the integration of Formal Methods as mandatory theme in any Computer Science University curriculum. In particular, when considering the ACM Curriculum for Computer Science, the inclusion of Formal Methods as a mandatory Knowledge Area needs arguing for why and how does every computer science graduate benefit from such knowledge. We do not agree with the sentence While there is a belief that formal methods are important and they are growing in importance, we cannot state that every computer science graduate will need to use formal methods in their career. We argue that formal methods are and have to be an integral part of every computer science curriculum. Just as not all graduates will need to know how to work with databases either, it is still important for students to have a basic understanding of how data is stored and managed efficiently. The same way, students have to understand why and how formal methods work, what their formal background is, and how they are justified. No engineer should be ignorant of the foundations of their subject and the formal methods based on these. In this article, we aim at highlighting why every computer scientist needs to be familiar with formal methods. We argue that education in formal methods plays a key role by shaping students' programming mindset, fostering an appreciation for underlying principles, and encouraging the practice of thoughtful program

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