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Recently, Delay / Disruption / Disconnection Tolerant Networking (DTN) which aims to enable communication under poor communication environments has been attracting attention. In DTN, direct communications among nodes are performed and messages of a node are replicated among nodes. This operation is repeated until a message is arrived at a destination node. Therefore, it is important to decide replication...
In Recent, there have been serious larger disasters, such as earthquakes tsumami, typhoons have around the world. Once disaster occurred, communication network infrastructure is often seriously damaged and network traffic is heavily congested. Particularly since the communication network infrastructure of mountainous and coast areas are not well developed, it is difficult to normally use the communication...
In Japan, since aging population and declining birth birthrate are advancing, most of the local areas are suffering from depopulation [1][2]. The decrease of economic activity is deriving poor social infrastructure such as bad road conditions and challenged information communication infrastructure. For those reasons, it is very difficult to keep the lives and properties of the residents in local areas...
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