134 documents found, page 1 of 14
On the stability of memory-dependent multi-agent systems under DoS attacks
Almeida, Ricardo; Girejko, Ewa; Machado, Luís; Malinowska, Agnieszka B.; Martins, NatáliaIn this paper, the stability analysis of memory-dependent multi-agent systems under Denial-of-Service attacks is conducted. The system under consideration is of fractional order, involving the Caputo derivative with respect to another function. Necessary and sufficient conditions for the positivity of the fractional linear system are provided. Moreover, a sufficient condition for asymptotic stability of positiv...
Innovation in Portuguese schools: what is the grammar of its conceptualization?
Martins, Natália; Palmeirão, Cristina; Alves, José MatiasMassification of schooling ensured all students access to education. Until now, the industrial school model was ideal, however, due to the coexistence of cultural and socioeconomic differences, it has become ineffective. Consequently, problems of school failure, dropout and hidden school dropout related to the school mission emerged. Thus, the solution reached, after several relatively unsuccessful “top-down” r...
Fractional tempered differential equations depending on arbitrary kernels
Almeida, Ricardo; Martins, Natália; Sousa, J. Vanterler da C.In this paper, we expanded the concept of tempered fractional derivatives within both the Riemann-Liouville and Caputo frameworks, introducing a novel class of fractional operators. These operators are characterized by their dependence on a specific arbitrary smooth function. We then investigated the existence and uniqueness of solutions for a particular class of fractional differential equations, subject to sp...
Generalized Herglotz-type variational problems based on Caputo distributed-orde...
Martins, NatáliaIn this paper, we broaden the investigation of fractional variational problems of Herglotz type. Specifically, we consider cases where the Lagrangian function depends on distributed-order fractional derivatives with arbitrary smooth kernels, the endpoint conditions, and a real parameter. The existing literature does not provide the means to analyze this category of generalized variational problems. The inclusio...
A Board Game Performance Index – a disruptive innovation to assess people with ...
Rosa, Marlene; Lopes, Susana; Martins, Natália; Lacomba-Arnau, ElenaTraditional observation scales could be subjective and less sensitive to behavioural changes in people with dementia with different levels of apathy. This pilot study aims to explore if there is a difference in a comprehensive game index between people with dementia with different levels of apathy. Patients with dementia were recruited and thirteen were selected for this study. Sociodemographic data, apathy lev...
O jogo analógico como sistema de otimização na avaliação da dupla tarefa em pes...
Rosa, Marlene; Lopes, Susana; Silva, Emanuel; Martins, NatáliaIntrodução: A utilização do jogo, enquanto sistema de avaliação em dupla tarefa, tem vindo a demonstrar um potencial relevante pelas suas propriedades. Objetivo: Testar a aplicabilidade do jogo analógico na avaliação de dupla tarefa em pessoas idosas. Metodologia: Foi realizado um estudo observacional, transversal, com uma mostra de 13 idosos com capacidade de caminhar curtas distâncias. Aamostra foi caracteriz...
Livro de Resumos da Conferência Longevidade Saudável 2023
Rosa, Marlene; Martins, Natália; Lopes, Susana; Baptista, Filipa; Silva, Emanuel; Seixas, Adérito; Tomé, Ana; Silva, Cláudia; Simões, DanielaA Conferência sobre Longevidade Saudável decorreu no dia 25 de novembro de 2023, em formato presencial, organizada no âmbito do programa de atividades da SpinOff do Politécnico de Leiria, AGILidades. Este encontro procurou ser um espaço de partilha, discussão e reflexão em torno de trabalhos de investigação, experiências profissionais e comunitárias, em que o tema da longevidade, o trabalho com diferentes geraç...
Multiplicative mixed-effects modelling of dengue incidence: an analysis of the ...
Freitas, Adelaide; Rodrigues, Helena Sofia; Martins, Natália; Iutis, Adela; Robert, Michael A.; Herrera, Demian; Colomé-Hidalgo, ManuelDengue is a vector-borne disease that is endemic to several countries, including the Dominican Republic, which has experienced dengue outbreaks for over four decades. With outbreaks growing in incidence in recent years, it is becoming increasingly important to develop better tools to understand drivers of dengue transmission. Such tools are critical for providing timely information to assist healthcare authorit...
Teachers’ appreciation of benefits and shortcomings of online and blended highe...
Skliarova, Iouliia; Meireles, Inês; Tchemisova, Tatiana; Cação, Isabel; Martins, NatáliaThis paper is devoted to identifying online teaching strategies appropriate for blended and face-to-face higher STEM (Science, Technology, Engineering, and Mathematics) education. The study is inspired by the experience gained during the COVID-19 pandemic lockdown, which forced many higher education institutions worldwide to shift abruptly to distance education and try many new tools, teaching methods, and stra...
Editorial for the special issue of axioms “Calculus of variations, optimal cont...
Martins, Natália; Almeida, Ricardo; Silva, Cristiana J.; Ammi, Moulay Rchid SidiNo abstract available.