Encontrados 13 documentos, a visualizar página 1 de 2
Influência da dinâmica de actualização na evolução da cooperação
Grilo, Carlos Fernando Almeida, 1972-Tese de doutoramento, Informática (Engenharia Informática), Universidade de Lisboa, Faculdade de Ciências, 2011 ; A identificação dos mecanismos que permitem promover a emergência e a manutenção de comportamentos de cooperação é um problema com relevância em diversas disciplinas científicas tais como a Biologia, a Sociologia, a Economia e a Informática. Numa população de indivíduos que interagem entre si, este...
The influence of the update dynamics on the evolution of cooperation
Grilo, Carlos Fernando Almeida; Correia, LuísWe investigate the influence of the update dynamics on the evolution of cooperation. Three of the most studied games in this area are used: Prisoner’s Dilemma, Snowdrift and the Stag Hunt. Previous studies with the Prisoner’s Dilemma game reported that less cooperators survive with the asynchronous version of the game than with the synchronous one. On the other side, studies with the Snowdrift game are not conc...
What makes spatial prisioner's dilemma game sensitive to asynchronism?
Grilo, Carlos Fernando Almeida; Correia, LuísWe investigate aspects that control the Spatial Prisoner’s Dilemma game sensitivity to the synchrony rate of the model. Based on simulations done with the generalized proportional and the replicator dynamics transition rules, we conclude that the sensitivity of the game to the synchrony rate depends almost exclusively on the transition rule used to model the strategy update by the agents. We then identify the f...
The influence of asynchronous dynamics in the spatial prisioner's dilemma game
Grilo, Carlos Fernando Almeida; Correia, LuísWe examine the influence of asynchronism in the Spatial Prisoner’s Dilemma game. Previous studies reported that less cooperation is achieved with the asynchronous version of the game than with the synchronous one. Here, we show that, in general, the opposite is the most common outcome. This conclusion is only possible because a larger number of scenarios was tested, namely, different interaction topologies, a t...
Asynchronous stochastic dynamics and the spatial prisioner's dilemma game
Grilo, Carlos Fernando Almeida; Correia, LuísWe argue that intermediate levels of asynchronism should be explored when one uses evolutionary games to model biological and sociological systems. Usually, only perfect synchronism and continuous asynchronism are used, assuming that it is enough to test the model under these two opposite update methods. We believe that biological and social systems lie somewhere between these two extremes and that we should in...
Musical pattern extraction using genetic algorithms
Grilo, Carlos Fernando Almeida; Cardoso, Fernando Amílcar BandeiraThis paper describes a research work in which we study the possibility of applying genetic algorithms to the extraction of musical patterns in monophonic musical pieces. Each individual in the population represents a possible segmentation of the piece being analysed. The goal is to find a segmentation that allows the identification of the most significant patterns of the piece. In order to calculate an individu...
Aplicação de algoritmos evolucionários à extracção de padrões musicais
Grilo, Carlos Fernando AlmeidaDissertação apresentada à Universidade de Coimbra para obtenção do grau de Mestre em Engenharia Informática, área científica de Inteligância Artificial, orientada por Fernando Amílcar Bandeira Cardoso. ; A extracção de padrões é um problema que se coloca em várias áreas como, por exemplo, a biologia molecular ou a área financeira, e que pode ser considerado, do ponto de vista da inteligência artificial, como u...
Paradigmatic analysis using genetic programming
Grilo, Carlos Fernando Almeida; Machado, Fernando; Cardoso, Fernando Amílcar BandeiraParadigmatic analysis consists in the segmentation of a musical piece through the identification of relations between different parts of the piece, and the classification of the identified segments into categories. In this paper we describe how a genetic programming system can be used to make the paradigmatic analysis of monophonic musical pieces, using a simple fitness function inspired in the Kolmogorov compl...
Composing music with case-based reasoning
Pereira, Francisco C.; Grilo, Carlos Fernando Almeida; Macedo, Luís; Cardoso, Fernando Amílcar BandeiraComunicação apresentada na International Conference on Computational Models of Creative Cognition, Dublin, 1997. ; Music is one of the most intriguing and joyful domain of research and analysis. Driven by this insatiable curiosity, Musical Analysis has emerged to formally understand and structure music and its intrinsic intention and causality. Each complete analysis of a piece points to issues that go far bey...
A structured framework for representing time in a generative composition system
Pereira, Francisco C.; Grilo, Carlos Fernando Almeida; Macedo, Luís; Cardoso, Fernando Amílcar BandeiraThe representation of music structures is, from Musicology to Artificial Intelligence, a widely known research focus. It entails several generic Knowledge Representation problems like structured knowledge representation, time representation and causality. In this paper, we focus the problem of representing and reasoning about time in the framework of a structured music representation approach, intended to suppo...
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