Conception et mise en oeuvre de systèmes multi-agents ouverts et distribués

Abstract : An open multi-agent system (MAS) is an extensible and evolutive system. Extensibility means the possibility of adding new agents but also of managing their withdrawals. Moreover, an open MAS must allow the evolution of the agents' abilities. We were interested in the design of open MAS from the perspective of the representation of others maintained by each agent of the system. In an open MAS, the representation that an agent has about others, may become false or incomplete. In existing works, this problem is managed by a central entity gathering a representation of each agent of the system. This entity, which may be a broker, a facilitor or yellow pages, provides sorne knowledge about others each time an agent requests it. This apprdach has two disadvantages. First, access to knowledge about others requires sorne message exchanges, which may be costly. The second one is that the whole system is dependent on the correct functionning of the central entity which is a critical and essential component of an open MAS for co-operation between agents. The first stage of our work was to analyze how the task consisting in integrating new agents can be distributed. This analysis led us to define a partial social madel of an agent which we call its welcoming facet. A welcoming agent is an agent having the ability to help a new agent to integrate the system to which it belongs. In an open MAS made up of welcoming agents, the integration of new agents is ensured by a collective and co-operative activity involving several welcoming agents. The development of a distributed approach to the design of open MAS led us to generalize this problem. With the help of our definition of welcoming tasks, we propose a general madel to design open MAS such that a conceptor may choose either a centralized or a distributed approach.
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  • HAL Id : tel-00839604, version 1

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Laurent Vercouter. Conception et mise en oeuvre de systèmes multi-agents ouverts et distribués. Système multi-agents [cs.MA]. Ecole Nationale Supérieure des Mines de Saint-Etienne; Université Jean Monnet - Saint-Etienne, 2000. Français. ⟨NNT : 2000STET4021⟩. ⟨tel-00839604⟩

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