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Publicações

2025

A Survey of Recent Advances and Challenges in Deep Audio-Visual Correlation Learning

Autores
Vilaça, L; Yu, Y; Viana, P;

Publicação
ACM COMPUTING SURVEYS

Abstract
Audio-visual correlation learning aims at capturing and understanding natural phenomena between audio and visual data. The rapid growth of Deep Learning propelled the development of proposals that process audio-visual data and can be observed in the number of proposals in the past years. Thus encouraging the development of a comprehensive survey. Besides analyzing the models used in this context, we also discuss some tasks of definition and paradigm applied in AI multimedia. In addition, we investigate objective functions frequently used and discuss how audio-visual data is exploited in the optimization process, i.e., the different methodologies for representing knowledge in the audio-visual domain. In fact, we focus on how human-understandable mechanisms, i.e., structured knowledge that reflects comprehensible knowledge, can guide the learning process. Most importantly, we provide a summarization of the recent progress of Audio-Visual Correlation Learning (AVCL) and discuss the future research directions.

2025

Correction: Guimarães et al. A Review of Recent Advances and Challenges in Grocery Label Detection and Recognition. Appl. Sci. 2023, 13, 2871

Autores
Guimarães, V; Nascimento, J; Viana, P; Carvalho, P;

Publicação
Applied Sciences

Abstract
There was an error in the original publication [...]

2025

Current Challenges and Future Perspectives in Testing IoT Systems: A Comprehensive Review

Autores
Bruno Lima; Rui Pinto;

Publicação
IEEE Sensors Reviews

Abstract

2025

Digital Technologies for the Transition to Collaborative Circular Economy Through R-Strategies – Insights from European Ventures

Autores
Fornasiero, R; Dalmarco, G; Zimmermann, R;

Publicação
IFIP Advances in Information and Communication Technology - Hybrid Human-AI Collaborative Networks

Abstract

2025

Towards Quantum Ray Tracing

Autores
Santo, LP; Bashford-Rogers, T; Barbosa, J; Navrátil, P;

Publicação
IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS

Abstract
Rendering on conventional computers is capable of generating realistic imagery, but the computational complexity of these light transport algorithms is a limiting factor of image synthesis. Quantum computers have the potential to significantly improve rendering performance through reducing the underlying complexity of the algorithms behind light transport. This article investigates hybrid quantum-classical algorithms for ray tracing, a core component of most rendering techniques. Through a practical implementation of quantum ray tracing in a 3D environment, we show quantum approaches provide a quadratic improvement in query complexity compared to the equivalent classical approach. Based on domain specific knowledge, we then propose algorithms to significantly reduce the computation required for quantum ray tracing through exploiting image space coherence and a principled termination criteria for quantum searching. We show results obtained using a simulator for both Whitted style ray tracing, and for accelerating ray tracing operations when performing classical Monte Carlo integration for area lights and indirect illumination.

2025

Multimodal Learning Applications on Digital Marketing: A Review

Autores
César I.; Pereira I.; Rodrigues F.; Miguéis V.; Nicola S.; Madureira A.;

Publicação
Lecture Notes in Networks and Systems

Abstract
The effectiveness of digital marketing relies on the seamless integration of intelligent technology, enabling encounters that closely resemble those experienced with physical vendors in the real world. Thus, the importance of scalable artificial intelligence (AI) systems guided by a multimodal approach cannot be overstated, as they can be used to gain a deeper understanding of user preferences and engagement behaviors. The investigation conducted concerning multimodal learning in this review uncovers a variety of benefits and limitations on the available data, presenting consistency in finding the relationship between modalities. The results suggest multimodality as a topic with a noticeable dearth of research, yet a promising path to reduce uncertainty and develop innovative perspectives on decision-making for Digital Marketing improvement tasks. The complexity inherent in data processes like analysis, processing, and granular modulation requires a lot of effort for researchers to build accurate multimodal representations while trying to suppress imprecision in these new elements. Therefore, our approach aims to explore how theoretical foundations are successfully applied to learning operational procedures, considering real-life case comprehension, the technical challenges of the learning process, and the importance given to each feature. Even so, comparing the restrictions found in the state-of-the-art made possible the reformulation of limitations to this particular type of technology and encouraged the search for more guidelines on the entire process.

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