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Continuous decrease in the size and cost of wireless interfaces and sensors will enable wireless sensor networks to be deployed in not too distant future. In such networks, there will be plenty of wireless nodes including everyday objects and sensors that will be completely different in transmission range, mobility model, and power supply. We define a(More)
Supporting Quality of Service (QoS) in a core transport is an important feature of a next generation network. This feature not only enables real-time communication services such as Voice over IP (VoIP) and video telephony, but also helps create new applications. However, access gateway such as Packet Data Gateway (PDG) in IMS WLAN Interworking, located at(More)
A 48-year-old woman was admitted to our hospital in 2003, complaining of weight loss. Complete blood cell count revealed thrombocytopenia. Abdominal CT demonstrated marked splenomegaly. FDG-PET revealed a hot spot in the whole spleen. A splenectomy was performed. Histological examination was typical for angiosarcoma. Adjuvant chemotherapy was given, and(More)
In the future, wireless access networks will diversify, and they are quite different in their characteristics. We focus on data transmission rate and area coverage, and assume overlay network composed of hot-spotted network and cellular network. Hot-spotted network indicates highspeed wireless network and very limited communication area due to its spotted(More)
We present a service initiation and migration system for real-time communication services in a ubiquitous networking environment. The key concepts are (1) the isolation of a few functions as common components with SIP protocol from realtime applications, (2) the incorporation of service migration into service initiation so that users can change resources at(More)
This paper proposes a media synchronization method for real-time group communication within a multiple device environment. The method controls the output time of each media unit received at multiple devices and synchronizes them, even if the arrival time of the media unit temporarily fluctuates. This fluctuation is caused by variation in bandwidth and the(More)