A multiagent system (MAS) has recently gained public attention as a method to solve competition and cooperation in distributed systems. However, MAS's vulnerability due to the propagation of failure prevents it from being applied to a large-scale system. This paper proposes an approach to improve the efficiency and reliability of distributed systems. The approach monitors messages between agents to detect undesirable behaviours such as failures. Collecting the information, the system generates global information of interdependence between agents and expresses it in a graph. This interdependence graph enables us to detect or predict undesirable behaviours. This paper also shows that the system can optimize performance of a MAS and improve adaptively its reliability under complicated and dynamic environment by applying the global information acquired from the interdependence graph to a replication system.
Web services are regarded as a new application paradigm in the world of the Internet. On the other hand, many business models of a power trading system has been proposed to aim at load reduction by consumers cooperating with electric power suppliers in an electric power market. Then, we propose a network model of power trading system using Web service in this paper. The adaptability of Web services to power trading system was checked in the prototype of our network model and we got good results for it. Each server provides functions as a SOAP server, and it is coupled loosely with each other through SOAP. Storing SOAP message in HTTP packet can establish the penetration communication way that is not conscious of a firewall. Switching of a dynamic server is possible by means of rewriting the server point information on WSDL at the time of obstacle generating.Web SOAP
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