FCT2-Artigos (em revistas ou actas indexadas)
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Percorrer FCT2-Artigos (em revistas ou actas indexadas) por Objetivos de Desenvolvimento Sustentável (ODS) "04:Educação de Qualidade"
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- The author’s journey—understanding and Improving the authoring process of theory-driven socially intelligent agentsPublication . Guimarães, Manuel; Campos, Joana; Santos, Pedro A.; Dias, João; Prada, RuiState-of-the-art agent-modelling tools support the creation of powerful Socially Intelligent Agents (SIAs) capable of engaging in social interactions with participants in various roles and environments. However, their deployment demands a labourious authoring task as it is necessary to manually define behaviour rules and create content for different interaction scenarios. While Socially Intelligent Agents (SIAs) research has centred on the user experience, we shift focus to the authors. To understand the challenges faced by authors who create these agents, we performed an innovative analysis of the authoring experience in modern agent modelling tools. One key finding is that, while SIA concepts are generally understandable, emotional-based concepts are not as easily comprehended or used by authors. We propose a hybrid solution approach that culminated in the development of Authoring-Assisted FAtiMA-Toolkit. The augmented agent modelling tool incorporates a data-driven Authoring Assistant to boost author productivity while promoting transparency and authorial control. To evaluate the impact of this framework on the authoring experience, we conducted a user study. Results showed that authors using the Authoring-Assisted FAtiMA-Toolkit were on average able to create more SIA-related content in less time. Our findings suggest that data-augmented, theory-grounded agent modelling tools can support the development of affective social agents by reducing the authoring burden without sacrificing the framework’s clarity or the authors’ control over the content.
- Categorical aspects of congruence distributivityPublication . Hoefnagel, Michael; Rodelo, DianaAbstract. We study a categorical condition on relations, which is a categorical formulation of Jónsson’s characterisation of congruence distributive varieties. Categories satisfying these conditions need not be varieties; for instance, the dual of the categories of topological spaces, ordered sets, G-sets, and the dual of any (pre)topos all provide us with examples.
- Continual learning for object classification: integrating AutoML for binary classification tasks within a modular dynamic architecturePublication . Turner, Daniel; Cardoso, Pedro; Rodrigues, JoaoFor humans it is quite easy to identify a new object after learning to identify existing ones, but not for a machine. Deep neural networks (DNN) are the foundation of the current state-of-the-art methods for training machines to recognize sets of objects. The issue is that any modification to the DNN weights that were trained to classify an initial set of objects has the potential to seriously impair the network’s ability to make those initial classifications; this behaviour is referred to as catastrophic forgetting (CF). This paper presents a continual learning (CL) architecture that can deal with CF. The architecture is composed of two primary parts: (i) The feature extraction component, which is based on the ResNet50 backbone and (ii) the modular dynamic classification (MDC) component. The latter is made up of multiple sub-networks that gradually assemble themselves into a tree-like structure that reorganizes itself as it learns over time, so that each sub-network can operate independently. The MDC relies heavily on binary classification, and here the application of automated machine learning (AutoML) was introduced, where each binary classifier is tailored on-the-fly, and is/can be different from object to object. The strategy involves a calculated selection from a predefined list of model types and parameters, optimizing them for their respective tasks. Results demonstrate that we advanced the adaptability and performance of the network, emphasizing the transformative potential of AutoML in modular CL approaches. Tests on the CORe50 dataset showed accuracy results of 81.1%, which are above the state of the art for CL architectures.
- Coupled phantom cosmological model motivated by the warm inflationary paradigmPublication . Halder, Sudip; Pan, Supriya; Sá, Paulo; Saha, TapanIn this article, we investigate a coupled phantom dark-energy cosmological model in which the coupling term between a phantom scalar field with an exponential potential and a pressureless dark-matter fluid is motivated by the warm inflationary paradigm. Using methods of qualitative analysis of dynamical systems, complemented by numerical solutions of the evolution equations, we study the late-time behavior of our model. We show that contrary to the uncoupled scenario, the coupled phantom model admits accelerated scaling solutions. However, they do not correspond to a final state of the Universe’s evolution and, therefore, cannot be used to solve the cosmological coincidence problem. Furthermore, we show that, for certain coupling parameter values, the total equation-of-state parameter’s asymptotic behavior is significantly changed when compared to the uncoupled scenario, allowing for solutions less phantom even for steeper potentials of the phantom scalar field.
- Daniel H. Burckhardt at 70—an appreciationPublication . Ouvrard, David; Serbina, Liliya Štarhová; Aguiar, António; Drohojowska, Jowita; Halbert, Susan E.; Raman, Anantanarayanan; Sharma, Anamika; Maseko, Zolile; Mauda, Evans; Zarcos Duarte, Beatriz; Cho, Geonho; Rendón-Mera, Diana Isabel; Yang, Man-Miao; Percy, Diana M.; Zürcher-Pfander, Isabelle; Malenovský, Igor; Bastin, Saskia; Queiroz, Dalva L.PD Dr Daniel H. Burckhardt (Figs 1–4) turned 70 on 26 July 2023.His extensive body of work on the taxonomy of insects, initiated even before his doctoral thesis on Western Palaearctic Aphalaridae in 1983, has since expanded to encompass all major psyllid groups (Hemiptera: Sternorrhyncha: Psylloidea), both extant and extinct, but also moss bugs (Hemiptera: Coleorrhyncha) and several families of beetles (Coleoptera, mainly Passandridae, but also Jacobsoniidae, Pterogeniidae and Staphylinidae). These contributions have had a profound and lasting impact on our global understanding of these relatively small and often overlooked groups of insects. The biographical details of Daniel Burckhardt’s career and life will not be revisited here, as they have already been thoroughly documented elsewhere. In terms of his tireless dedication and remarkable productivity, the comprehensive list of his publications at the end of this article speaks for itself.Another telling measure of his influence within entomology is the number of PhD students he has mentored, formally or informally, many of whom have gone on to establish successful careers in leading research institutions and natural history museums across Europe and beyond. At a time when taxonomic expertise is rapidly declining, with serious implications for biodiversity research, agriculture and conservation, his intellectual legacy, marked by rigour, precision, and clarity, has been effectively passed on to the next generation. This tribute aims above all to highlight the personal and professional impact Daniel Burckhardt has had on so many colleagues and collaborators. Rather than a conventional biography, it offers a space for those who have worked with him to share their experiences and anecdotes, and to reflect on the influence he has had on their scientific journeys.
- The de sitter swampland conjectures in the context of chaplygin-inspired inflationPublication . Bertolami, Orfeu; Potting, Robertus; Sá, PauloIn this work, we discuss the de Sitter swampland conjectures in the context of the generalized Chaplygin-inspired inflationary model. We demonstrate that these conjectures can be satisfied, but only in the region of the parameter space far away from the General Relativity limit. The cosmic microwave background data had already been found to restrict the allowed inflationary potentials of this model. Our results impose a further limitation on the possible potentials.
- Evaluation 2-functors for Kac–Moody 2-categories of type A2Publication . Mackaay, Marco; Macpherson, James; Vaz, PedroWe construct a 2-functor from the Kac–Moody 2-category for the extended quantum affine sl3 to the homotopy 2-category of bounded chain complexes with values in the Kac–Moody 2-category for quantum gl3 , categorifying the evaluation map between the corresponding quantum Kac–Moody algebras. Our approach establishes and exploits a categorical analogue of the wellknown relation between the evaluation map and Lusztig’s internal braid group action for quantum gl3 .
- Existence of weak solutions for parabolic equations involving the p(x,t)-Laplacian with non-continuous, unbounded pPublication . Bae, Hyeong-Ohk; Borges de Oliveira, Hermenegildo; Wolf, JörgWe consider a parabolic equation involving the p(x,t)-Laplacian as a prime term in a time-space cylinder QT := Ω × (0,T) ⊂ Rd ×R,d≥ 2. We assume that p(x,t): QT → (1,+∞) is a continuous function, except in a closed set of zero measure. Under the assumption that p is unbounded, such that 1 < infK×(δ,T)p(x,t) ≤ supK× (δ,T) p(x,t) < ∞ for every compact set K ⊂ Ω and δ ∈ (0,T), we prove the existence of a weak solution to the corresponding initial- and boundary-value problem for any given initial velocity in L2(Ω). © 2026 Elsevier Inc. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
- Feature papers in biochemPublication . Aureliano, Manuel; Ma, BuyongBiochemistry, or the chemistry of life, is an interdisciplinary science that uses strategies and methods from all exact and natural sciences. In that sense, Biochemistry is a discipline known to be challenging for students, typically due to the extent and complexity of the content [1]. However, in the last 10 years, at least fifteen Nobel Prizes in Chemistry, Physiology and Medicine have been awarded in the field and/or for applications of Biochemistry, which reflects the importance of this area of knowledge in contemporary societies [2–7]. Biochemistry connects essential metal ions such as Mg2+, Ca2+, Na+ and Fe2+, and organic compounds, such as nucleic acids, sugars, lipids and proteins, to make biological systems possible, representing a unique platform for interdisciplinary collaborations in teaching and in research [8,9]. Moreover, in addition to biomolecules (proteins, nucleic acids, sugars and lipids), small molecules are necessary for cellular homeostasis, for example, carbonate ions and phosphate ions, responsible for stabilizing physiological pH (close to 7.0) or antioxidants that prevent the effects of cellular stress, as well as due to environmental pollutants, such as metals and/or microplastics [10–12].
- Feature papers in BioChem, 2nd EditionPublication . Aureliano, Manuel; Ma, BuyongAs mentioned in the Editorial of the first edition of the Special Issue on “Feature Papers in BioChem”, biochemistry acts as a key cog in the “clock of the knowledge, permitting that wheels from several science areas move each other” [1]. Moreover, the understanding of life on earth is a perpetual topic in biochemistry, with boundaries dependent on the specificities of each time period and scientific environment [1]. Thus, following the first edition, this Special Issue on “Feature Papers in BioChem, 2nd Edition” still emphases interdisciplinary research in diverse and interconnected scientific areas, with a majority from molecular medicine, cell biology and of course biochemistry (Table 1). Among these scientific fields, a wide range of topics were addressed, as expressed by the diversity of the titles and keywords that can be found in each contribution.