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A next generation distributed system is expected to adapt to various changes of both the users' requirements and the operational conditions of environment where the distributed system operates. The aim of our research is to establish a new design model of an adaptive distributed system (ADS) to deal with various changes occurred in the system environment.(More)
Agent-based systems have been designed and developed using recent agent technologies. However, design and debugging of these systems is difficult because of agents' situational and nondeterministic behavior, and effective design support technologies have not been proposed. To raise the efficiency of the agent system design process, we propose an interactive(More)
— This paper presents a gentle system for supervising care-support services that fulfill users' actual requirements based on their physical locations and statuses of system components in ubiquitous computing environments. To address issues of traditional supervisory systems based only on location information and the situation of one side of the watching(More)
A microgrid is an eco-friendly power system because renewable sources such as solar and wind power are used as the main power sources. For this reason, much research, development, and demonstration projects have recently taken place in many countries. Operation is one of the important research topics for microgrids. For efficient and economical microgrid(More)
The explosive growth in online information is making it harder for large, globally distributed organizations to foster collaboration and leverage their intellectual assets. Recently, there has been a growing interest in the development of next generation knowledge management systems focussing on the artificial intelligence based technologies. We propose a(More)
In recent years, P2P networks have been evolving at a rapid pace. Authentication of nodes in P2P networks, however, remains a difficult task to conduct efficiently. In this paper, we therefore propose a new authentication method called hash-based distributed authentication method (HDAM). HDAM realizes a decentralized efficient mutual authentication(More)
One of the most important requirements of microgrid operation is to maintain a constant frequency such as 50 Hz or 60 Hz, which is closely related to a power balance between supply and demand. In general, microgrids are connected to power grids and surplus/shortage power of microgrids is traded with power grids. Since islanded microgrids are isolated from(More)
AbstrAct In this paper, a concept of " symbiotic computing " is formalized to bridge gaps between Real Space (RS) and Digital Space (DS). Symbiotic computing is a post-ubiquitous computing model based on an agent-oriented computing model that introduces social heuristics and cognitive functions into DS to bridge the gaps. The symbiotic functions and(More)