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Publications

2022

Predicting Argument Density from Multiple Annotations

Authors
Rocha, G; Leite, B; Trigo, L; Cardoso, HL; Sousa-Silva, R; Carvalho, P; Martins, B; Won, M;

Publication
NATURAL LANGUAGE PROCESSING AND INFORMATION SYSTEMS (NLDB 2022)

Abstract
Annotating a corpus with argument structures is a complex task, and it is even more challenging when addressing text genres where argumentative discourse markers do not abound. We explore a corpus of opinion articles annotated by multiple annotators, providing diverse perspectives of the argumentative content therein. New annotation aggregation methods are explored, diverging from the traditional ones that try to minimize presumed errors from annotator disagreement. The impact of our methods is assessed for the task of argument density prediction, seen as an initial step in the argument mining pipeline. We evaluate and compare models trained for this regression task in different generated datasets, considering their prediction error and also from a ranking perspective. Results confirm the expectation that addressing argument density from a ranking perspective is more promising than looking at the problem as a mere regression task. We also show that probabilistic aggregation, which weighs tokens by considering all annotators, is a more interesting approach, achieving encouraging results as it accommodates different annotator perspectives. The code and models are publicly available at https://github.com/DARGMINTS/argument density.

2022

Quantitative Weak Linearisation

Authors
Alves, S; Ventura, D;

Publication
ICTAC

Abstract
Weak linearisation was defined years ago through a static characterization of the intuitive notion of virtual redex, based on (legal) paths computed from the (syntactical) term tree. Weak-linear terms impose a linearity condition only on functions that are applied (consumed by reduction) and functions that are not applied (therefore persist in the term along any reduction) can be non-linear. This class of terms was shown to be strongly normalising with deciding typability in polynomial time. We revisit this notion through non-idempotent intersection types (also called quantitative types). By using an effective characterisation of minimal typings, based on the notion of tightness, we are able to distinguish between “consumed” and “persistent” term constructors, which allows us to define an expansion relation, between general ? -terms and weak-linear ? -terms, whilst preserving normal forms by reduction.

2022

GEOPHYSICAL EXPLORATION OF ANTIMONY MINERALIZATIONS: ALTO DO SOBRIDO AND RIBEIRO DA SERRA MINES (PORTUGAL)

Authors
Carvalho A.; Ribeiro R.; Moura R.; Lima A.;

Publication
International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM

Abstract
The Alto do Sobrido and Ribeiro da Serra Mines, are two antimony-gold mines located in Gondomar, Portugal, and are part of the Dúrico-Beirão Mining District (DBMD). In this work, we use four geophysical methods, such as gravity, radiometry, magnetic and electromagnetic, to improve the knowledge about these mineralizations and the lithologies and structures associated with them. These four methods allowed us to study these mineralizations through different physical properties. The gravimetric method allowed us to add more data to the hypothesis that the gold-antimony mineralizations of the DBMD could be genetically associated with a non-outcropping granite intrusion, which functioned either as a heat engine that promoted the circulation of fluids and/or as a source of fluids and metals itself. A 2D model was proposed, created with both modelling and inversion, to show that the presence of this granite could indeed fit the response of the negative anomalies found in the residual anomaly. The radiometric method was used mainly as a mapping tool, where we were able to distinguish between some of the lithologies of the area, like the Lower Ordovician quartzites and the metasediments of the Middle Ordovician to the Carboniferous, but also to observe different element concentrations within the Pre-Ordovician Schist-Greywacke Complex (SGC). These variations within the SGC lithology don’t have a clear explanation as to why they occur. Still, we believe that they could occur due to the influence of the abovementioned non-outcropping granite. With the very low frequency (VLF) electromagnetic method, it was possible to locate areas of lower resistivities that correspond to the location of several known mineralized veins, as well as the probable location for a new vein. It was also possible to observe some weathered rocks near faults and fractures associated with the Dúrico-Beirão Shear Zone (DBSZ). With the magnetic method, it is possible to contribute to areas with the prevalence of lithologies and minerals with higher magnetic susceptibilities. Several magnetic anomalies found near the Alto do Sobrido mining works correspond to the mineralized veins paragenesis. Other anomalies appear to be related to the location of faults and fractures associated with the DBSZ. The use of all these methods allowed us to observe the mineralization responses and its associated lithologies and structures through the different geophysical properties while adding knowledge about the genesis of these mineralizations and possibly the location of new mineralized veins.

2022

ACOMPANHAMENTO E AVALIAÇÃO DA APRENDIZAGEM NA EDUCAÇÃO HÍBRIDA E EDUCAÇÃO ONLIFE: PERSPECTIVA CARTOGRÁFICA E GAMIFICADA

Authors
MOREIRA, JA; SCHLEMMER, E;

Publication
Revista de Educação Pública

Abstract
O artigo discute e problematiza o acompanhamento e a avaliação da aprendizagem no âmbito da Educação Híbrida e Educação OnLIFE, evidenciando a construção destes conceitos. O objetivo da pesquisa é apresentar e discutir uma proposta de acompanhamento e avaliação da aprendizagem, desenvolvida a partir de elementos presentes no método cartográfico de pesquisa intervenção e elementos presentes na gamificação. Os resultados apontam o potencial do desenho para provocar deslocamentos na forma como os professores compreendem a avaliação e, para instigar processos metacognitivos e tomada de consciência sobre o processo de aprendizagem.

2022

Virtual Assistants in a Digital Governance Environment

Authors
Pimentel, L; Reis, A; Do Rosario Matos Bernardo, M; Rocha, T; Barroso, J;

Publication
Proceedings - 26th International Conference on Circuits, Systems, Communications and Computers, CSCC 2022

Abstract
Technological developments have had a major impact on the intensive use of electronic equipment, networked or connected to the internet, factors that have boosted the emergence and growth of cybercrime. Measures to mitigate and combat the phenomenon, taking into account its complexity and specificity, must involve all public entities with responsibility in the sector, in a global effort to promote digital literacy in the areas of cybersecurity and computer crime prevention. These comprehensive actions should use digital technologies based on artificial intelligence (AI), such as virtual assistants, whose characteristics allow the massification of information transmission, while enhancing the digital inclusion of users. Government entities are engaged in adopting technologies based on chatbots, with their presence in several areas of public administration. Despite the evolution, these resources have not yet been made available by the entities responsible for mitigating computer crime. On the other hand, although there are government programs aimed at increasing the digital skills of citizens, namely regarding the protection of devices, digital content or personal data, they are not designed for the specificities of cybercrime. In this context, a system based on chatbots, implemented in a digital governance context, by law enforcement agencies, with resources shared with other government entities can contribute to the prevention of cybercrime. © 2022 IEEE.

2022

Omnidirectional robot modeling and simulation

Authors
Magalhães, SC; Moreira, AP; Costa, PG;

Publication
CoRR

Abstract

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