Ferreira, Miguel
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Ferreira
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Miguel
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Miguel Ferreira
Biography
Luis Miguel Mesquita da Silva Ferreira, nasceu em 1980 na cidade do Porto. É matemático de formação, com uma trajetória académica que inclui licenciatura e mestrado na Universidade do Porto, seguidos de um doutoramento na Universidade do Minho. Ao longo da sua carreira, tem publicado vários artigos científicos em revistas internacionais, contribuindo para o avanço do conhecimento na sua área. Atualmente, desempenha funções como professor auxiliar no departamento de Ciência e tecnologia da Universidade Portucalense, onde partilha o seu saber e orienta futuros profissionais. Para além da paixão pela matemática e pelo ensino, os seus momentos de lazer são dedicados à leitura e à prática de desporto, dois hobbies que lhe permitem manter um equilíbrio entre o estímulo intelectual e o bem-estar físico.
É membro não integrado do REMIT.
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7312-2245-4991
55860403900Research Projects
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REMIT – Research on Economics, Management and Information Technologies
Centro de investigação que que tem como objetivo principal produzir e disseminar conhecimento teórico e aplicado que possibilite uma maior compreensão das dinâmicas e tendências económicas, empresariais, territoriais e tecnológicas do mundo contemporâneo e dos seus efeitos socioeconómicos. O REMIT adota uma perspetiva multidisciplinar que integra vários domínios científicos: Economia e Gestão; Ciências e Tecnologia; Turismo, Património e Cultura.
Founded in 2017, REMIT – Research on Economics, Management and Information Technologies is a research unit of Portucalense University. Based on a multidisciplinary and interdisciplinary perspective it aims at responding to social challenges through a holistic approach involving a wide range of scientific fields such as Economics, Management, Science, Technology, Tourism, Heritage and Culture.
Grounded on the production of advanced scientific knowledge, REMIT has a special focus on its application to the resolution of real issues and challenges, having as strategic orientations:
- the understanding of local, national and international environment;
- the development of activities oriented to professional practice, namely in the business world.
14 results
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Now showing 1 - 10 of 14
Publication Open Access Two-player zero-sum stochastic differential games with Markov-switching jump-diffusion dynamics2025-05-01 - Ferreira, Miguel; Pinheiro, Diogo; Pinheiro, SusanaWe consider a two-player zero-sum stochastic differential game (SDG) with hybrid state variable dynamics given by a Markov-switching jump-diffusion. We study this game using a combination of dynamic programming and viscosity solution techniques, generalizing the seminal work of Fleming and Souganidis to a broader class of SDGs. Under some mild assumptions, we prove that the value of the game exists and is the unique viscosity solution of a certain nonlinear partial integro-differential equation of Hamilton-Jacobi-Bellman-Isaacs type.Publication Restricted Access A statistical duality for Random Matching of Agents2025-05-06 - Yannacopoulos, Athanasios; Oliveira, Bruno; Ferreira, Miguel; Martins, José; Pinto, AlbertoWe propose a statistical duality among the preferences and endowments of the agents. Under this duality, the logarithmic prices of random trades among agents in a decentralized economy converge in expectation to the logarithm of the Walrasian equilibrium price in a centralized economy.Publication Restricted Access Autoimmunity arising from bystander proliferation of T cells in an immune response model2011-04-01 - Burroughs, N. J.; Ferreira, Miguel; Oliveira, B. M. P. M.; Pinto, A. A.We study a mathematical model of immune response by T cells where the regulatory T cells (Treg) inhibit interleukin 2 secretion. The bystander proliferation to an immune response is modelled. We consider an asymmetry reflecting that the difference between the growth and death rates can be higher for the active T cells and Tregs than for the inactive. This asymmetry leads to a better understanding of the bystander proliferation. An exposure to a pathogen results in an increased proliferation rate of the bystander T cells. If the population of the bystander T cells becomes large enough, autoimmunity can arise, eventually after a long transient period.Publication Restricted Access On the convergence to Walrasian prices in random matching Edgeworthian economies2011-05-22 - Pinto, A. A.; Ferreira, Miguel; Finkenstädt, B. F.; Oliveira, B.; Yannacopoulos , A. N.We show that for a specific class of random matching Edgeworthian economies, the expectation of the limiting equilibrium price coincides with the equilibrium price of the related Walrasian economies. This result extends to the study of economies in the presence of uncertainty within the multi-period Arrow-Debreu model, allowing to understand the dynamics of how beliefs survive and propagate through the market.Publication Open Access A Novel Approach to Training Monotony and Acute-Chronic Workload Index: A Comparative Study in Soccer2021-05-31 - Afonso, José; Nakamura, Fábio Yuzo; Canário-Lemos, Rui; Peixoto, Rafael; Fernandes, Cátia Sofia; Mota, Tomás; Ferreira, Miguel; Silva, Rafaela; Teixeira, Armando; Clemente, Filipe ManuelLoad is a multifactorial construct, but usually reduced to parameters of volume and intensity. In the last decades, other constructs have been proposed for assessing load, but also relying on relationships between volume and intensity. For example, Foster's Training Monotony has been used in athletes' load management simply by computing mean weekly load divided by its standard deviation, often multiplied by session rate of perceived exertion. Meanwhile, the Acute to Chronic Workload Ratio (ACWR) has been debated by the sport scientists as a useful monitoring metric and related to so-called injury prevention. None of these models includes parameters that are representative of training specificity, namely load orientation. The aim of this study is to present broader conceptual approaches translated by new indices for assessing Intraweek Training Monotony (ITM) and Acute to Chronic Workload Index (ACWI) while incorporating load orientation, session duration and weekly density (frequency normalized) in addition to parameters related to proxies of external and/or internal load. Our ITM and Foster's Training Monotony were similar in terms of average values, but very different for individualized analysis, illustrating how average values may be deceiving. While Foster's model provided clusters of values, ITM provided more scattered, individualized data. ACWI and ACWR provided very distinct qualitative information, and the two models were uncorrelated. Therefore, the models incorporating training load orientation presented in this study provide distinct and not redundant information when compared to previous models. More importantly, ITM and ACWI are metrics that are compatible to each other and might fit to coaches' monitoring targets in the short and medium terms, respectively. Because our models include several parameters, including load orientation, we contend that might provide a more complete monitoring tool. However, we suggest they are used for intraindividual comparisons and not so strongly for interindividual comparisons.Publication Restricted Access Two-player zero-sum stochastic differential games with random horizon2019-11-15 - Ferreira, Miguel; Pinheiro, D.; Pinheiro, S.We consider a two-player zero-sum stochastic differential game with a random planning horizon and diffusive state variable dynamics. The random planning horizon is a function of a non-negative continuous random variable, which is assumed to be independent of the Brownian motion driving the state variable dynamics. We study this game using a combination of dynamic programming and viscosity solution techniques. Under some mild assumptions, we prove that the value of the game exists and is the unique viscosity solution of a certain nonlinear partial differential equation of Hamilton–Jacobi–Bellman–Isaacs type.Publication Restricted Access Immune response dynamics2011-04-01 - Burroughs, N. J.; Oliveira, B. M. P. M.; Pinto, A. A.; Ferreira, MiguelThe consequences of regulatory cell (Treg) inhibition of interleukine 2 secretion are examined by mathematical modelling. We determine the analytic formula that describes the fine balance between Regulatory cells and cells at controlled and immune response equilibrium states. We demonstrate that cytokine dependent growth exhibits a quorum cell population threshold that determines if immune responses develop on activation. We determine the analytic formulas of cell proliferation thresholds that allow us to study the sensibility of the quorum growth thresholds controlling immune responses.Publication Open Access R&d dynamics2013-11-01 - Becker, J.; Ferreira, Miguel; Oliveira, B. M. P. M.; Pinto, A. A.We study a Cournot duopoly model using Ferreira-Oliveira-Pinto's R&D investment function. We find the multiple perfect Nash equilibria and we analyse the economical relevant quantities like output levels, prices, consumer surplus, profits and welfare.Publication Restricted Access Optimal consumption, investment and life insurance selection under robust utilities2023-09-01 - Ferreira, Miguel; Pinheiro, D.; Pinheiro, S.We study the problem faced by a wage earner with an uncertain lifetime who has access to a Black–Scholes-type financial market consisting of one risk-free security and one risky asset. His preferences relative to consumption, investment and life insurance purchase are described by a robust expected utility. We rewrite this problem in terms of a two-player zero-sum stochastic differential game and we derive the wage earner optimal strategies for a general class of utility functions, studying the case of discounted constant relative risk aversion utility functions with more detail.Publication Restricted Access Dynamics of Immunological Models2010-08-04 - Pinto, A. A.; Burroughs, N. J.; Ferreira, Miguel; Oliveira , B. M. P. M.We analyse the effect of the regulatory T cells (Tregs) in the local control of the immune responses by T cells. We obtain an explicit formula for the level of antigenic stimulation of T cells as a function of the concentration of T cells and the parameters of the model. The relation between the concentration of the T cells and the antigenic stimulation of T cells is an hysteresis, that is unfold for some parameter values. We study the appearance of autoimmunity from cross-reactivity between a pathogen and a self antigen or from bystander proliferation. We also study an asymmetry in the death rates. With this asymmetry we show that the antigenic stimulation of the Tregs is able to control locally the population size of Tregs. Other effects of this asymmetry are a faster immune response and an improvement in the simulations of the bystander proliferation. The rate of variation of the levels of antigenic stimulation determines if the outcome is an immune response or if Tregs are able to maintain control due to the presence of a transcritical bifurcation for some tuning between the antigenic stimuli of T cells and Tregs. This behavior is explained by the presence of a transcritical bifurcation.