7 documents found, page 1 of 1
Leveraging transfer learning for hate speech detection in Portuguese social med...
Ramos, G.; Batista, F.; Ribeiro, R.; Fialho, P.; Moro, S.; Fonseca, A.; Guerra, R.; Carvalho, P.; Marques, C.; Silva, C.The rapid rise of social media has brought about new ways of digital communication, along with a worrying increase in online hate speech (HS), which, in turn, has led researchers to develop several Natural Language Processing methods for its detection. Although significant strides have been made in automating HS detection, research focusing on the European Portuguese language remains scarce (as it happens in se...
A comprehensive review on automatic hate speech detection in the age of the tra...
Ramos, G.; Batista, F.; Ribeiro, R.; Fialho, P.; Moro, S.; Fonseca, A.; Guerra, R.; Carvalho, P.; Marques, C.; Silva, C.The rapid proliferation of hate speech on social media poses significant challenges to maintaining a safe and inclusive digital environment. This paper presents a comprehensive review of automatic hate speech detection methods, with a particular focus on the evolution of approaches from traditional machine learning and deep learning models to the more advanced Transformer-based architectures. We systematically ...
Contribution of coal combustion to black carbon: coupling tracers with the aeth...
Blanco-Alegre, C.; Fialho, P.; Calvo, A. I.; Castro, A.; Coz, E.; Oduber, F.; Prévôt, A. S. H.; Močnik, G.; Alves, C.; Giardi, F.; Pazzi, G.; Fraile, R.Black carbon (BC) aerosol characteristics have been analysed from January 2016 to March 2017 in an urban background area (León, Spain), located in a coal-mining region, where this fuel is commonly used. The monthly and seasonal variations of BC and source contributions were examined. The mean equivalent BC concentration (eBC) during cold and warm months were 1.0±0.5 and 0.6±0.2 μg m-3, respectively. eBC can be ...
Aethalometer measurements in a road tunnel: a step forward in the characterizat...
Blanco-Alegre, C.; Calvo, A. I.; Alves, C.; Fialho, P.; Nunes, T.; Gomes, J.; Castro, A.; Oduber, F.; Coz, E.; Fraile, R.A sampling campaign was conducted in the Liberdade Avenue tunnel (Braga, Portugal) during a week (with 56,000 vehicles) to monitor black carbon (eBC-equivalent black carbon) by means of an Aethalometer AE-31, and gaseous pollutants (CO2, CO, NOx). Inside the tunnel, the mean eBC mass concentration was 21 ± 10 μg m-3, reaching a maximum hourly value of 49.0 μg m-3. An hourly and weekday-weekend study was carried...
Chatbots’ greetings to human-computer communication
Pereira, M. J,; Coheur, L.; Fialho, P.; Ribeiro, R.In the last years, chatbots have gained new attention, due to the interest showed by widely known personalities and companies. The concept is broad, and, in this paper we target the work developed by the (old) community that is typically associated with chatbot’s competitions. In our opinion, they contribute with very interesting know-how, but specially with large-scale corpora, gathered by interactions with re...
Unusual winter Saharan dust intrusions at Northwest Spain: air quality, radiati...
Oduber, F.; Calvo, A. I.; Blanco-Alegre, C.; Castro, A.; Nunes, T.; Alves, C.; Sorribas, M.; Fernández-González, D.; Vega-Maray, A. M.Saharan air masses can transport high amounts of mineral dust particles and biological material to the Iberian Peninsula. During winter, this kind of events is not very frequent and usually does not reach the northwest of the Peninsula. However, between 21 and 22 February 2016 and between 22 and 23 February 2017, two exceptional events were registered in León (Spain), which severely affected air quality. An int...
The application of a multi-wavelength aethalometer to estimate iron dust and bl...
Fialho, P.; Cerqueira, M.; Pio, C.; Cardoso, J.; Nunes, T.; Custódio, D.; Alves, C.; Almeida, S. M.; Almeida-Silva, M.; Reis, M.; Rocha, F.The two-component model (Fialho etal., 2006) was used to decouple the contributions of black carbon (BC) and iron oxides, present in dust, to the aerosol attenuation coefficient, measured with a multi-wavelength Aethalometer. The model results were compared with the elemental carbon (EC) and iron concentrations determined in the laboratory from the analysis of aerosol particles collected with conventional sampl...