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Many Virtual Reality (VR) applications, such as Virtual Learning Environments or Interactive Virtual Tours, are based on a rich semantic description of the environment and tasks that users have to perform. These applications are built upon Virtual Environments (VEs) in which artificial agents act autonomously while interacting in realtime with users.(More)
This paper presents a model that provides adaptive and evolutive interaction between a human and a virtual agent. After introducing the theoretical justifications, the aliveness metaphor and the notion of coupling are presented. Then, we propose a formalization of the model that relies on the temporal evolution of the coupling between participants and the(More)
This paper presents a platform dedicated to a full body interaction between a virtual agent and human or between two virtual agents. It is based on the notion of coupling and the metaphor of the alive communication that come from studies in psychology. The platform, based on a modular architecture, is composed of modules that communicate through messages.(More)
In this article, we study the notion of similarity within the context of cluster analysis. We begin by studying different distances commonly used for this task and highlight certain important properties that they might have, such as the use of data distribution or reduced sensitivity to the curse of dimen-sionality. Then we study inter-and intra-cluster(More)
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