Masatoshi Kawarasaki

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Various web services are offered over the internet and forms the social infrastructure indispensable to our daily life. Many of healthcare systems developed so far are also offered as web service. However, user interface of web services that require web access makes obstacle to elderly or inexperienced users. As a mean to mitigate such digital divide, we(More)
This paper proposes metadata framework architecture for policy based content delivery over network. It also addresses policy based QoS control and CDN management as implementation examples of proposed architecture. In broadband ubiquitous networks, this architecture enables content aware QoS control and automatic content adaptation to usage environment that(More)
If IP network only uses conventional routing protocols such as open shortest path first (OSPF), some portions of the network become congested while other portions remain underutilized depending on the variations of traffic demand. MPLS that provides explicit routing along pre-determined path can improve load balancing throughout the network, thus achieves(More)
P2P applications impose an enormous traffic load on the Internet. Actually, however, topological difference between P2P network and underlying physical network (Internet network) is creating inefficient use of the physical network resources. To this problem, we propose P2P download control methods using router network parameters (e.g., number of(More)
Heart disease has the second high mortality rate behind cancer in Japan, and requires quick treatment. To take a part in emerging mHealth, we developed a wearable heart disease monitoring and alerting system “Dentan”. Dentan continuously monitors patient's ECG in his/her daily activities and issues an alert to the patient as well as(More)
Recently, the video delivery service is spreading along with the penetration of broadband access to residential users. Although Content Delivery Network (CDN) system has been deployed for video delivery, it's costly because equipment reinforcement is needed as a number of client increases. To settle this problem, use of Peer-to-Peer (P2P) system has been(More)
Heart disease has the second high mortality rate behind cancer in Japan, and requires quick treatment. To take a part in emerging mHealth, the authors developed a wearable electrocardiographic (ECG) monitoring and alerting system “iHeart”. iHeart continuously monitors patient’s ECG in his/her daily activities and issues an alert to the patient as well as(More)