Seung Wok Han

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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(More)
Ubiquitous computing environment involves a variety of devices of different capabilities. Here middleware takes a crucial role for efficiently coordinating the components and providing proper services. In this paper we propose a new middleware architecture called HOMEROS, which allows high flexibility by adopting a hybrid-network model and dynamically(More)
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(More)
Context-awareness is one of the key features of ubiquitous paradigm. To intelligently and sensitively deal with dynamic environment, a methodology specifying the relationships between the contexts and services needs to be developed. It is difficult to verify the correctness of the existing models on context with respect to timeliness. In this paper we(More)
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(More)
In mobile computing the location information of the objects is an important factor in providing customized services to the users. The location-based service (LBS) is one of the technologies providing the services adoptively according to the changed user position. The existing filtering technology employed in the typical pub/sub model has some drawbacks such(More)
In pervasive computing environment a number of distributed applications asynchronously exchange data using the event-based mechanism. The OMG defined CORBA Event Service for asynchronous messaging, which provides a flexible channel for asynchronous communication among the distributed and collocated objects. In the existing Event Service channels are created(More)
The context-aware services require to efficiently perceive not only the user requirements but also the context of the environment to provide customized services to the user. To efficiently develop the context-aware applications a systematic methodology correctly specifying the relation among dynamically changing contexts is essential. Here the context model(More)
The packets in the Internet are classified by edge router according to the traffic conditioning agreement (TCA) in differentiated services (DiffServ) domain. The core routers forward the packets in different fashion according to the PHB(Per Hop-Behavior). Currently, the QoS during handover is not guaranteed since packet buffering does not consider PHB(More)