Kenji Masui

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Social networks that are built on top of the web, e.g., orkut [9], have been proliferating among online communities. We propose social internetworks, 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 are(More)
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)
To sustain a large-scale overlay network, knowledge about network characteristics is indispensable. However, the collection of such information is often a burden on the developers: why should they struggle to obtain the information even though it is not their intended purpose? As one solution to this problem, this paper presents N-TAP, a distributed(More)
The Internet is a complex collection of various nodes which run independently. The hardware and software of nodes are quite diverse and these elements make the complexity of the Internet. It is difficult to model these behaviors, so we proposed and implemented StarBED, a large-scale testbed using general PCs and switches. Thus we created an environment for(More)
Besides the classic measurement methodologies such as ping for measuring RTT and traceroute for discovering IP topology, there also exists a new trend in measurement methodology, cooperative measurement [1,2]. In cooperative measurement, a measurement node sometimes communicates with other measurement nodes, shares collected data, and estimates the network(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)
OBJECTIVE The purpose of this study was to investigate the immediate effects of manual traction of the hip joint on joint space width (JSW) on asymptomatic subjects. METHODS Asymptomatic, healthy male volunteers (n = 15), aged 25 to 34 years were included in this study. Three radiographs were obtained with the subjects in the supine position, before and(More)
OBJECTIVE The purpose of this study was to investigate morphologic differences using plain film radiographs in cervical intervertebral foramina (IVF) for the following positions: neutral; flexion combined with lateral flexion to the right, rotation to the left (FLFR-RL); and flexion combined with lateral flexion to the right, rotation to the right(More)
The eXplicit Control Protocol (XCP), which explicitly sends feedback information on the current network resource condition to endhosts 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)