Jorge Louçã

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This paper examines the interplay of opinion exchange dynamics and communication network formation. An opinion formation procedure is introduced which is based on an abstract representation of opinions as k–dimensional bit–strings. Individuals interact if the difference in the opinion strings is below a defined similarity threshold dI. Depending on dI ,(More)
This paper presents a multi-agent model to support decision-making in organizations. The model is characterized by being interactive, distributed, and incremental and by the use of cognitive maps to represent the knowledge of decision-making actors. The main proposition is to consider the context of concepts belonging to cognitive maps in a way that it(More)
We propose a descriptive 2D Hybrid Cellular Automaton model that simulates the growth behavior of a tissue with cancerous cells. We combine a set of hallmarks of cancer (Hanahan and Weinber, 2000) with the effect of acidification of the cell surroundings by the production of acid by tumorous cells and model some aspects of the communication in living(More)
The general goal of this research is to study the relationships between individual and social cognition (e.g., organizational culture development), an approach to the micro-macro link in social and cognitive sciences [Sawyer, 2003] [Schillo, 2000]. More specifically, this work aims to represent, in a multiagent system, how does organizational knowledge(More)
This article proposes applying the variation of information measure from Information Theory to evaluate macro‐level properties characterising dynamic networks. This measure is used to evaluate different clusters given by the agglomerative hierarchical clustering algorithm of Clauset, Newman and Moore (2004), concerning a case study of the multi‐agent based(More)
This paper examines some methodological and conceptual challenges concerning the study of emergent patterns of behavior in communication networks. We discuss the notion of intentionality in collectives in the light of two case studies. The first one regards the mechanisms of communication in a community of insects. The second case study concerns the " smart(More)
This paper proposes a generic software architecture for the concurrent execution of social simulation models. Concurrent execution of simulation models has considerable advantages regarding other ways of comparing models, such as run-time comparison, performance evaluation, and the possibility of interaction between complementary models. A tool has been(More)
We present a formal framework for the identification and interpretation of emergent properties in environments where agents participate in distinct kinds of relations or networks. We focus here on the interplay between social and geographic relations in the behavior of our agents. The method we present provides a way to detect emergent properties in the(More)