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Multiagent Systems (multiagent + system)

Distribution by Scientific Domains

Information Science and Computing	100%

Selected Abstracts

Economics-inspired decentralized control approach for adaptive grid services and applications

INTERNATIONAL JOURNAL OF INTELLIGENT SYSTEMS, Issue 12 2006
Lei Gao
Grid technologies facilitate innovative applications among dynamic virtual organizations, while the ability to deploy, manage, and properly remain functioning via traditional approaches has been exceeded by the complexity of the next generation of grid systems. An important method for addressing this challenge may require nature-inspired computing paradigms. This technique will entail construction of a bottom-up multiagent system; however, the appropriate implementation mechanism is under consideration in order for the autonomous and distributed agents to emerge as a controlled grid service or application. A credit card management service in economic interactions is considered in this article for a decentralized control approach. This consideration is based on a preliminarily developed ecological network-based grid middleware that has features desired for the next generation grid systems. The control scheme, design, and implementation of the credit card management service are presented in detail. The simulation results show that (1) agents are accountable for their activities such as behavior invocation, service provision, and resource utilization and (2) generated services or applications adapt well to dynamically changing environments such as agent amounts as well as partial failure of agents. The approach presented herein is beneficial for building autonomous and adaptive grid applications and services. © 2006 Wiley Periodicals, Inc. Int J Int Syst 21: 1269,1288, 2006. [source]

COALITIONS AMONG INTELLIGENT AGENTS: A TRACTABLE CASE

COMPUTATIONAL INTELLIGENCE, Issue 1 2006
M. V. Belmonte
Coalition formation is an important mechanism for cooperation in multiagent systems. In this paper we address the problem of coalition formation among self-interested agents in superadditive task-oriented domains. We assume that each agent has some "structure," i.e., that it can be described by the values taken by a set of m nonnegative attributes that represent the resources w each agent is endowed with. By defining the coalitional value as a function V of w, we prove a sufficient condition for the existence of a stable payment configuration,in the sense of the core,in terms of certain properties of V. We apply these ideas to a simple case that can be described by a linear program and show that it is possible to compute for it,in polynomial time,an optimal task allocation and a stable payment configuration. [source]

Genetic fuzzy systems to evolve interaction strategies in multiagent systems

INTERNATIONAL JOURNAL OF INTELLIGENT SYSTEMS, Issue 9 2007
Igor Walter
This article suggests an evolutionary approach to designing interaction strategies for multiagent systems, focusing on strategies modeled as fuzzy rule-based systems. The aim is to learn models evolving database and rule bases to improve agent performance when playing in a competitive environment. In competitive situations, data for learning and tuning are rare, and rule bases must jointly evolve with the databases. We introduce an evolutionary algorithm whose operators use variable length chromosomes, a hierarchical relationship among individuals through fitness, and a scheme that successively explores and exploits the search space along generations. Evolution of interaction strategies uncovers unknown and unexpected agent behaviors and allows a richer analysis of negotiation mechanisms and their role as a coordination protocol. An application concerning an electricity market illustrates the effectiveness of the approach. © 2007 Wiley Periodicals, Inc. Int J Int Syst 22: 971,991, 2007. [source]

A requirement specification language for configuration dynamics of multiagent systems

INTERNATIONAL JOURNAL OF INTELLIGENT SYSTEMS, Issue 3 2004
Mehdi Dastani
In agent-mediated applications, the system configuration can change because of the creation and the deletion of agents. The behavior of such systems on the one hand depends on the dynamics of the system configuration; on the other hand, behavior of such a system consists of the information dynamics of the system. We discuss configuration and information dynamics of agent-mediated systems and define a requirement language to express properties of those dynamics. A prototypical scenario for an agent-mediated system is discussed and some important requirements for this system are specified. It is shown how these properties can be verified automatically to evaluate system behavior. © 2004 Wiley Periodicals, Inc. [source]