Cookies
O website necessita de alguns cookies e outros recursos semelhantes para funcionar. Caso o permita, o INESC TEC irá utilizar cookies para recolher dados sobre as suas visitas, contribuindo, assim, para estatísticas agregadas que permitem melhorar o nosso serviço. Ver mais
Aceitar Rejeitar
  • Menu
Publicações

2024

The role of social learning on consumers' willingness to engage in demand-side management: An agent-based modelling approach

Autores
Golmaryami, S; Nunes, ML; Ferreira, P;

Publicação
SMART ENERGY

Abstract
Achieving a sustainable energy future requires a clean, affordable energy supply and active consumer engagement in the energy market. This study proposes to evaluate and simulate energy consumers' willingness to participate in demand-side management programs using an agent-based modelling approach to address the social learning effect as a key factor influencing energy consumer behaviour. The proposed agent-based model simulates households' electricity consumer interactions examining how the willingness to shift electricity usage is encouraged through the social environment, while accounting for the diversity among consumers. Data from a survey conducted in Portugal, including questions about the influence of recommendations from friends or family members on individuals' willingness to engage in demand response activities, are used to test the proposed simulation. The findings reveal that social learning significantly impacts demand response acceptance, yet the extent of this influence varies depending on the socio-economic characteristics of households' electricity consumers. The study confirms agent-based model as an effective approach for capturing social dynamics and supporting electricity market decision making, providing valuable insights for devising consumers engagement strategies.

2024

Development of a Controller for the FANUC S-420FD Industrial Robot: A Description of the Graphical User Interface

Autores
Grilo, V; Ferreira, E; Barbosa, A; Chaves, F; Lima, J;

Publicação
ROBOT 2023: SIXTH IBERIAN ROBOTICS CONFERENCE ADVANCES IN ROBOTICS, VOL 1

Abstract
This paper describes the development of a complete controller for the FANUC S-420FD 6-axis industrial robot. The original controller of the robot presented failures that made it impossible to operate and that negatively impacted the academic and research activities. To solve this problem, it was proposed the development of a new open-technology controller and also the design of an intuitive and functional graphical interface, allowing the programming, control and monitoring of the robot parameters. The developed interface offers advanced features such as trajectory programming, custom parameter configuration, and real-time visualization of the robot's state. This work highlights the importance of efficient and affordable solutions for the maintenance of industrial robots in university environments, encouraging scientific and technological advancement in these areas of study.

2024

Performance evaluation of national and international kidney exchange programmes with the ENCKEP simulator

Autores
Druzsin, K; Biró, P; Klimentova, X; Fleiner, R;

Publicação
CENTRAL EUROPEAN JOURNAL OF OPERATIONS RESEARCH

Abstract
In this paper we present simulations for international kidney exchange programmes (KEPs). KEPs are organised in more than ten countries in Europe to facilitate the exchanges of immunologically incompatible donors. The matching runs are typically conducted in every three months for finding optimal exchanges using hierarchical optimisation with integer programming techniques. In recent years several European countries started to organise international exchanges using different collaboration policies. In this paper we conduct simulations for estimating the benefits of such collaborations with a simulator developed by the team of the ENCKEP COST Action. We conduct our simulations on generated datasets mimicking the practice of the three largest KEPs in Europe, the UK, Spanish and the Dutch programmes. Our main performance measure is the number of transplants compared to the number of registrations to the KEP pools over a 5-year period, however, as a novelty we also analyse how the optimisation criteria play a role in the lexicographic and weighted optimisation policies for these countries. Besides analysing the performances on a single instance, we also conduct large number of simulations to obtain robust findings on the performance of specific national programmes and on the possible benefits of international collaborations.

2024

Deep Learning Model Evaluation and Insights in Inherited Retinal Disease Detection

Autores
Ferreira, H; Marta, A; Couto, I; Camara, J; Beirao, JM; Cunha, A;

Publicação
WIRELESS MOBILE COMMUNICATION AND HEALTHCARE, MOBIHEALTH 2023

Abstract
Inherited retinal diseases such as Retinitis Pigmentosa and Stargardt's disease are genetic conditions that cause the photoreceptors in the retina to deteriorate over time. This can lead to vision symptoms such as tubular vision, loss of central vision, and nyctalopia (difficulty seeing in low light) or photophobia (high light). Timely healthcare intervention is critical, as most forms of these conditions are currently untreatable and usually focused on minimizing further vision loss. Machine learning (ML) algorithms can play a crucial role in the detection of retinal diseases, especially considering the recent advancements in retinal imaging devices and the limited availability of public datasets on these diseases. These algorithms have the potential to help researchers gain new insights into disease progression from previous classified eye scans and genetic profiles of patients. In this work, multi-class identification between the retinal diseases Retinitis Pigmentosa, Stargardt Disease, and Cone-Rod Dystrophy was performed using three pretrained models, ResNet101, ResNet50, and VGG19 as baseline models, after shown to be effective in our computer vision task. These models were trained and validated on two datasets of autofluorescent retinal images, the first containing raw data, and the second dataset was improved with cropping to obtain better results. The best results were achieved using the ResNet101 model on the improved dataset with an Accuracy (Acc) of 0.903, an Area under the ROC Curve (AUC) of 0.976, an F1-Score of 0.897, a Recall (REC) of 0.903, and a Precision (PRE) of 0.910. To further assess the reliability of these models for future data, an Explainable AI (XAI) analysis was conducted, employing Grad-Cam. Overall, the study showed promising capabilities of Deep Learning for the diagnosis of retinal diseases using medical imaging.

2024

Guidelines and Recommendations for Optimal Implementation of Integrated Local Energy Communities

Autores
Perez, ER; Fina, B; Iglár, B; Monsberger, C; Maggauer, K; Weber, AB; Yiasoumas, G; Georghiou, G; Villar, J; Mello, J; Stanev, R;

Publicação
Integrated Local Energy Communities: From Concepts and Enabling Conditions to Optimal Planning and Operation

Abstract
Integrated local energy communities (ILECs) introduction involves a set of challenges for the existing energy infrastructure. As a result of the development and research performed in projects on this topic, several guidelines and recommendations are formulated. This chapter recaps major problems of the implementation of ILECs identified in the reviewed literature and provides recommendations to overcome them by covering five dimensions. In the technical dimension, the implementation of strategies to avoid the grid reinforcement as well as coordination between system operators become crucial for the development of ILEC-related technologies. In terms of regulations, tax exemptions, additional financial funding, and simplification of paperwork for projects should be introduced backed by a clear EU strategy. In the environmental dimension, ILECs boost the transition toward decentralized renewable generation contributing to the gradual replacement of fossil-fuel generation plants and this benefit can be maximized by performing deeper environmental assessments. Additionally, there is a need of cost-effective financial tools for planning and management as well as the development of suitable economic incentives. Lastly, the implementation of strategies to increase the social acceptance of the ILEC paradigm through the organization of engagement activities between citizens, stakeholders, and other actors arises as the key action. © 2025 WILEY-VCH GmbH. Published 2025 by WILEY-VCH GmbH. All rights reserved.

2024

CLARE-XR: explainable regression-based classification of chest radiographs with label embeddings

Autores
Rocha, J; Pereira, SC; Sousa, P; Campilho, A; Mendonca, AM;

Publicação
SCIENTIFIC REPORTS

Abstract
An automatic system for pathology classification in chest X-ray scans needs more than predictive performance, since providing explanations is deemed essential for fostering end-user trust, improving decision-making, and regulatory compliance. CLARE-XR is a novel methodology that, when presented with an X-ray image, identifies the associated pathologies and provides explanations based on the presentation of similar cases. The diagnosis is achieved using a regression model that maps an image into a 2D latent space containing the reference coordinates of all findings. The references are generated once through label embedding, before the regression step, by converting the original binary ground-truth annotations to 2D coordinates. The classification is inferred minding the distance from the coordinates of an inference image to the reference coordinates. Furthermore, as the regressor is trained on a known set of images, the distance from the coordinates of an inference image to the coordinates of the training set images also allows retrieving similar instances, mimicking the common clinical practice of comparing scans to confirm diagnoses. This inherently interpretable framework discloses specific classification rules and visual explanations through automatic image retrieval methods, outperforming the multi-label ResNet50 classification baseline across multiple evaluation settings on the NIH ChestX-ray14 dataset.

  • 323
  • 4387