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Publicações

2024

Multi-objective planning of community energy storage systems under uncertainty

Autores
Anuradha, K; Iria, J; Mediwaththe, CP;

Publicação
Electric Power Systems Research

Abstract

2024

Odyssey: A Spatial Data Infrastructure for Archaeology

Autores
Sá, R; Gonçalves, LJ; Medina, J; Neves, A; Marsh, F; Al Rawi, M; Canedo, D; Dias, R; Pereiro, T; Hipólito, J; da Silva, AL; Fonte, J; Seco, LG; Vázquez, M; Moreira, J;

Publicação
Journal of Computer Applications in Archaeology

Abstract
Geospatial data acquisition methods like airborne LiDAR allow for obtaining large volumes of data, such as aerial and satellite imagery, which are increasingly being used in archaeology. As in other subjects, the ability to produce raw datasets far exceeds the capacity of domain experts to process and analyze them, but recent developments in image processing, Geographic Information Systems (GIS), Machine Learning (ML) and related technologies enable the transformation of large volumes of data into useful information. However, these technologies are challenging to use and not designed to interact with each other. Hence, tools are needed to efficiently manage, share, document, and reuse archaeological data. This article presents the Odyssey SDI platform, a spatial data infrastructure for annotating, validating, and visualizing data about archaeological sites. This platform is built upon GeoNode, and special-purpose modules were developed for dealing with archaeological information. The main contribution is the integration of remote sensing, GIS features and ML algorithms in a single framework. © 2024 The Author(s).

2024

Explainable Multimodal Deep Learning for Heart Sounds and Electrocardiogram Classification

Autores
Oliveira, B; Lobo, A; Botelho Costa, CIA; Carvalho, RF; Coimbra, MT; Renna, F;

Publicação
EMBC

Abstract
We introduce a Gradient-weighted Class Activation Mapping (Grad-CAM) methodology to assess the performance of five distinct models for binary classification (normal/abnormal) of synchronized heart sounds and electrocardiograms. The applied models comprise a one-dimensional convolutional neural network (1D-CNN) using solely ECG signals, a two-dimensional convolutional neural network (2D-CNN) applied separately to PCG and ECG signals, and two multimodal models that employ both signals. In the multimodal models, we implement two fusion approaches: an early fusion and a late fusion. The results indicate a performance improvement in using an early fusion model for the joint classification of both signals, as opposed to using a PCG 2D-CNN or ECG 1D-CNN alone (e.g., ROC-AUC score of 0.81 vs. 0.79 and 0.79, respectively). Although the ECG 2D-CNN demonstrates a higher ROC-AUC score (0.82) compared to the early fusion model, it exhibits a lower F1-score (0.85 vs. 0.86). Grad-CAM unveils that the models tend to yield higher gradients in the QRS complex and T/P-wave of the ECG signal, as well as between the two PCG fundamental sounds (S1 and S2), for discerning normalcy or abnormality, thus showcasing that the models focus on clinically relevant features of the recorded data.

2024

Manual for VR-powered lessons

Autores
Makrides, Gregory; Aufenanger, Stefan; Bastian, Jasmin; Damianos, Gavalas; Vlasis, Kasapakis; Apostolos, Kostas; Solarz, Pawel; Szemberg, Tomasz; Szpond, Justyna; Bastos, Glória; Castelhano, Maria; Ferreira, Célia; Morgado, Leonel; Pedrosa, Daniela;

Publicação

Abstract

2024

Artificial intelligence technologies: Benefits, risks, and challenges for sustainable business models

Autores
Torres, AI; Beirão, G;

Publicação
Artificial Intelligence Approaches to Sustainable Accounting

Abstract
This chapter aims to contribute to the understanding of how artificial intelligence (AI) technologies can promote increased business revenues, cost reductions, and enhanced customer experience, as well as society's well-being in a sustainable way. However, these AI benefits also come with risks and challenges concerning organizations, the environment, customers, and society, which need further investigation. This chapter also examines and discusses how AI can either enable or inhibit the delivery of the goals recognized in the UN 2030 Agenda for Sustainable Business Models Development. In this chapter, the authors conduct a bibliometric review of the emerging literature on artificial intelligence (AI) technolo¬gies implications on sustainable business models (SBM), in the perspective of Sustainable Development Goals (SDGs) and investigate research spanning the areas of AI, and SDGs within the economic group. The authors examine an effective sample of 69 publications from 49 different journals, 225 different institutions, and 47 different countries. On the basis of the bibliometric analysis, this study selected the most significant published sources and examined the changes that have occurred in the conceptual framework of AI and SBM in light of SDGs research. This chapter makes some significant contributions to the literature by presenting a detailed bibliometric analysis of the research on the impacts of AI on SBM, enhancing the understanding of the knowledge structure of this research topic and helping to identify key knowledge gaps and future challenges. © 2024, IGI Global. All rights reserved.

2024

Digital Product Passport Architecture for Boosting Circularity in Footwear Industry

Autores
Sousa, C; Ferreira, R; Pinto, P; Pereira, C; Rebelo, R;

Publicação
Procedia Computer Science

Abstract
This paper discusses the Digital Product Passport (DPP) as a key tool for achieving a circular economy. An architecture of the DPP is presented built upon the principles of data spaces and W3C Decentralized Identifiers (DIDs). By leveraging data spaces, the DPP enables secure and controlled data exchange among stakeholders, fostering transparency, traceability, and collaboration throughout the product's lifecycle. The use of decentralized identifiers ensures the uniqueness and verifiability of product-related information, facilitating seamless access and sharing of data. The DPP architecture offers a promising framework for realizing the circular economy by promoting resource efficiency, sustainable practices, and informed decision-making. © 2024 The Author(s). Published by Elsevier B.V.

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