Kenji Masui

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— Nowadays many new technologies are being developed and introduced for Internet, home networks, and sensor networks. The new technologies must be evaluated in detail before deployment. However the above mentioned networks have a large number of nodes and a complicated topology. Therefore it is difficult to analyze such networks using typical network(More)
Social networks that are built on top of the web, e.g., orkut [9], have been proliferating among online communities. We propose social inter-networks, where essential functions of social networks are implemented on top of peer-to-peer networks. Participants and communities are connected through attribute queries and reputation queries; reputation queries(More)
For sustaining a large-scale overlay network, the knowledge of network characteristics for its optimization is indispensable. However, the collection of such information is often a burden on the developers: why should I struggle to obtain it even though it's not my intended purpose? As one solution to this problem, this paper presents N-TAP, a distributed(More)
The importance of large-scale measurement infrastructures for grasping the global state of the Internet is recently strongly emphasized. However , a fundamental analysis of these infrastructures has not yet been conducted. In this paper, we highlight the formation of measurement networks and provide a first look at measurement activities performed on those(More)
The eXplicit Control Protocol (XCP), which explicitly sends feedback information on the current network resource condition to end-hosts to control congestion, is a promising protocol for the network supported congestion control that will be needed in the future Internet. Because of its flexibility, XCP can provide relative bandwidth allocation service that(More)
A new generation of widely distributed systems to measure the Internet topology at the interface level is currently being deployed. Cooperation between monitors in these systems is required in order to avoid over-consumption of network resources. This paper proposes an architecture for a distributed topology measurement (DTM) system that, for the first(More)
We demonstrate Astrolabe, a visualization software of network characteristics that utilizes an application-oriented measurement platform called N-TAP. N-TAP agents are deployed among end nodes and cooperate with one another for network monitoring. By obtaining network characteristics from N-TAP, Astrolabe dynamically displays the current state of the(More)