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Context awareness service is one of the key features in ubiquitous computing system. In heterogeneous pervasive computing system, effective context modeling and reasoning are important to enable the collaboration and distributed reasoning among the agents. The effectiveness of the previous approaches for distributed reasoning significantly degrades when a large number of agents are involved. In order...
Multi-agent system in the ubiquitous computing environment can provide customized services to the users by effectively utilizing the distributed resources. The existing dynamic load balancing approach invokes the migration of agents even for temporal imbalance of the loads. In this paper we propose a prediction-based dynamic load balancing scheme which can effectively avoid unnecessary agent migration...
With rapid development of ubiquitous computing technology, the amount of context information collected from various sensors has been increased fast. These information should be managed and accessed by only the authorized person. In this paper we propose a new access control approach for multi-agent system based on the role-based access control (RBAC) model. To effectively reflect the continuously...
Multi-agent system consists of a number of cooperative agents which have agreed to work together for a common goal. When scheduling the messages in an agent system, if the same priority is assigned to all the agents without considering the importance of their role, the performance may not be maximized. In this paper we propose a new priority-based message scheduling scheme. It enables the agent system...
In ubiquitous environment intelligent and transparent services are provided to the users anytime and anywhere. Ubiquitous systems can be effectively implemented using the agent technology, while the agent platform supports efficient and stable interaction among the agents. In this paper we propose a load-balancing scheme which considers agent state for fair and efficient resource allocation to the...
In ubiquitous computing the multi-agent system can provide intelligent services to the users by effectively utilizing the resources distributed in the environment. The traditional load balancing approach based on the load condition of the nodes is not suitable to the multi-agent system (MAS). In this paper we propose an efficient load balancing scheme for MAS employing the models formulated to identify...
In order to reliably support various services using multi-agent system, the faults in the system need to be tolerated. While various schemes have been proposed for fault tolerant MAS, the replication approach provides the basis of short recovery latency, less intrusive with respect to the execution time, and high scalability. In this paper we propose a new replication scheme making a decision on either...
The context-aware system provides customized services to the users according to the current context. The traditional context reasoning process always produces the same result for the given context, called fixed matchmaking. With this, though, the context processing time substantially increases when the number of same events becomes large. We propose to solve this problem by just-in-time (JIT) matchmaking,...
Ubiquitous computing requires an intelligent environment where the users do not need to be involved in the operation. The agent technology allows effective implementation of ubiquitous system, while agent platform provides efficient and stable interaction between the agents. In this paper we propose a hierarchical P2P networking approach where the messages are combined inside the agent platform and...
In multi-agent system the goal is achieved by the collaboration of the agents. The communication between the agents over the existing network infrastructure is typically 'best effort', and as a result, the agents might receive different QoS. In this paper we propose a scheme supporting fair QoS for all the agents in the system. It is achieved by sensing the network condition and allocating different...
Nowadays, the agent grouping paradigm receives a great attention by the multi-agent system(MAS) developers. Meanwhile, the existing agent development tools do not effectively support agent grouping. In this paper we propose a new agent platform architecture with which agent groups can be dynamically created, deleted, and federated with other groups. We also propose a service discovery approach that...
In the multi-agent system frequent interactions among the agents are inevitable in order to provide timely high quality services. In this paper we introduce a new scheduling service model improving the performance of communication in the multi-agent system. It assigns priority to the messages according to the weight of formalized ACI message and the number of message exchanges between the agents....
Modern software system is required to be flexible and adaptable to deal with dynamic environment. To address this new requirement, meta-level architecture description-based dynamic software adaptation has been proposed, which refers to the software system changing its structure and behavior at runtime without user intervention. In this paper we propose an approach for multi-agent system offering dynamic...
The applications for ubiquitous system require to effectively use the resources distributed in the environment for providing customized services to the users. In this paper we propose a middleware architecture displaying high scalability with event-based multi-agent platform, which allows dynamic creation of community for service oriented computing. It consists of event-based communication platform...
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