Masaaki Ohnishi

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This paper proposes an incremental algorithm for constructing the Delaunay overlaid network for virtual collaborative space. In our algorithm, every node uses Delaunay triangulation, by using its knowledge of other nodes and cooperatively exchanging information among nodes, which generates and refines overlaid networks. On the resultant Delaunay network,(More)
In this paper, we propose skip Delaunay network (SDN), which is a scalable geographic network that connects computational entities or nodes in a 2D space by constant P2P hop counts. SDN has a hybrid structure of hierarchical logical networks and Delaunay networks, both of which are generated by P2P communications among nodes. It enables, GeoUnicast to(More)
Wireless access networks of the future could provide a variety of context-aware services with the use of sensor information in order to solve regional social problems and improve the quality of residents’ lives as a part of the regional infrastructure. NerveNet is a conceptual regional wireless access platform in which multiple service providers provide(More)
This paper identifies communication system functions and technologies that a local region, individuals living in that region, and various communities to which each individual belongs require and propose a community communication service platform for providing those functions and technologies. To provide a variety of services suited to the characteristics of(More)
A new-generation access network should be able to transport various kinds of dynamically changing sensor information about specific localities or private individuals to different destination servers in a secure manner for processing so that the various processed information can be used in an integrated manner to provide advanced context-aware services.(More)
This paper proposes an algorithm for autonomous generation of spherical Delaunay network in P2P settings for global Internet applications. In our algorithm, nodes work as autonomous computers, sites, sensors, etc, and all nodes generate a local network according the proximity and geometry of neighboring nodes, while all nodes cooperatively and incrementally(More)
Panoramic radiography and cone-beam computed tomography (CT) were used to analyze asymptomatic radiopaque lesions in the jaw bones and determine the diagnostic relevance of the lesions based on their relationships to teeth and site of origin. One hundred radiopaque lesions detected between 1998 and 2002 were examined by both panoramic radiography and(More)
A managed wireless mesh for infrastructure-level, stable regional mesh network has been studied. NerveNet, which we have been proposing, is a concept of future regional platform network that covers local regions and provides various context-aware services with the shared use of sensors and actuators. The managed wireless mesh developed for materializing(More)
Nerve Net is a concept of regional wireless access platform where multiple service providers can provide their own services with the shared use of the network and sensors, making various context-aware services practical. It works as the nervous system of the human beings. Densely located, interconnected access points with database and data processing unit(More)