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IP multicasting is an efficient and scalable way to deliver high quality audio and video streams for group communication. However, widespread deployment of IP multicast is unlikely in near future and it requires substantial infrastructure modifications. For rapid deployment of multicast application, Application Layer Multicast (ALM) is an alternate choice(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)
We have been working on research and development of advanced network and applications called "flexible computing". We are now in the next stage of this research, strongly pressing forward the concept of flexible computing, namely, "symbiotic computing", towards next generation computing model based on co-existence of real space and digital space. In this(More)
In this research, our aim is to construct an effective quality of service (QoS) routing scheme for mobile ad hoc networks (MANET) that provides the service to satisfy required quality by absorbing dynamic changes of network resources. In this paper, we propose an application-level QoS routing scheme for MANETs (ALRS) as a novel QoS routing, that includes(More)
Ý¿ 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)
Access control to resources is one of the most important technologies for supporting human activities in the digital space. To realize the control two schemes were proposed: RBAC (Role-Based Access Control) and TRBAC (Temporal Role-Based Access Control) by adding time constraints and role dependencies to RBAC. However, these methods are not effective for(More)
To reduce the loads imposed on network administrators, we have proposed AIR-NMS, which is a network management support system (NMS) based on Active Information Resource (AIR). In AIR-NMS, various information resources (e.g., state information of a network, practical knowledge of network management) are combined with software agents which have the knowledge(More)
We propose a new knowledge sharing scheme to effectively support networked cooperative works in this paper. Our scheme controls information flow from real space (RS) to digital space (DS) and reverse direction, based on the concept of "symbiotic computing". In practice, our scheme controls the availability of shared workspace in DS for cooperative works,(More)