94 documents found, page 1 of 10
Mobility effect on city pollution: A case study
Juma, A.; Elvas, L. B.; Ferreira, J. C.; Nunes, L.The present work reports the impacts on urban mobility and air quality in Lisbon, Portugal, of the imposed restrictions to curb the transmission of SARS-CoV-2 virus, which causes COVID-19 disease. We performed a data-driven approach over Lisbon Smart cities data, collected from several sources, such as traffic and pollution. During the first Portuguese emergency period (18-03-2020 to 03-05-2020) the sharp reduc...
Acacia sp. bark: from waste to a nature-based solution for water treatment
Ferreira, R.; Coura, R. D.; Nunes, L.; Ferraz, A. I.; Rodrigues, A. C.Coagulation-flocculation is an important process in water treatment plants. Recent studies have shown the potential of condensed tannins for the production of coagulants of natural origin, as an alternative to chemical coagulants. The present study highlights the importance of the development of nature-based solutions that can be alternative to conventional processes and is focused on optimizing the process of ...
Use of programming aids in undergraduate courses
Peixoto, A.; Glória, A.; Silva, J. L.; Pinto-Albuquerque, M.; Brandão, T.; Nunes, L.The use of external tips and applications to help with programming assignments, by novice programmers, is a double-edged sword, it can help by showing examples of problem-solving strategies, but it can also prevent learning because recognizing a good solution is not the same skill as creating one. A study was conducted during the 2superscript{nd} semester of 23/24 in the course of Object Oriented Programming to...
Explainable artificial intelligence (XAI): A systematic literature review on ta...
Martins, T.; de Almeida, A.; Cardoso, E.; Nunes, L.Explainable Artificial Intelligence (XAI) is a growing area of research that aims to improve the interpretability of the not-so-informative black-box models. However, it is currently difficult to categorize an existing method in terms of its intrinsic characteristics and explainability. We provide a new unified yet simple taxonomy for the categorization of XAI methods and present the explainability methods curr...
Occlusion-aware pedestrian detection and tracking
Correia, S.; Mendes, D.; Jorge, P.; Brandão, T.; Arriaga, P.; Nunes, L.This paper proposes an occlusion-aware mechanism, used on a framework for detecting and tracking pedestrians in videos acquired from surveillance cameras, which includes the extraction of trajectory points, estimation of walking velocities, detection of groups, and projection of the final trajectories into a 2D plan. The occlusion-aware mechanism is introduced in order to manage irregularities in the pedestrian...
A inteligência artificial como ferramenta de apoio à decisão
Nunes, L.O maior impacto, para um maior número de pessoas, será provavelmente a crescente sofisticação dos "assistentes" pessoais ou especializados. Estes poderão gerar respostas a questões feitas em língua natural e adaptar-se ao perfil do utilizador e das tarefas que desempenha. Há algumas décadas que este cenário tem merecido a atenção da comunidade científica, quer no que diz respeito à arquitetura do sistema em pro...
Inteligência artificial para a administração pública como experiência pedagógica
Nunes, L.; Cardoso, E.; de Almeida, A.; Ribeiro, R.; Guimarães, F.; Mamede, R. P.; Ferreira, J.O objetivo da missão Inteligência Artificial para a Administração Pública (IA>AP)* é promover a ligação entre estudantes, docentes e investigadores do Iscte, na área de Inteligência Artificial (IA), e as instituições da Administração Pública (AP). Pretende-se disponibilizar os conhecimentos e experiência académica na área de IA às entidades da AP que detêm dados passíveis de exploração, muitas vezes não usados,...
Hybrid training to generate robust behaviour for swarm robotics tasks
Nunes, L.; Oliveira, S.Training of robotic swarms is usually done for a specific task and environment. The more specific the training is, the more the likelihood of reaching a good performance. Still, flexibility and robustness are essential for autonomy, enabling the robots to adapt to different environments. In this work, we study and compare approaches to robust training of a small simulated swarm on a task of cooperative identifi...
Multi-camera person re-identification based on trajectory data
Mendes, D.; Correia, S.; Jorge, P.; Brandão, T.; Arriaga, P.; Nunes, L.This study presents a trajectory-based person re-identification algorithm, embedded in a tool to detect and track customers present in a large retail store, in a multi-camera environment. The customer trajectory data are obtained from video surveillance images captured by multiple cameras, and customers are detected and tracked along the frames that compose the videos. Due to the characteristics of a multi-came...
Improving android application quality through extendable, automated security te...
Ferreira, N.; Palma, F.; Serrão, C.; Nunes, L.; de Almeida, A.Users trust their most sensitive data to their mobile devices and installed applications. These applications continuously collect information about users and their interactions and store that data locally or share it over the network. App stores provide these applications for the user devices and act as trust gateways between the application developers and the end-users, providing the needed assurance to the us...