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This paper proposes a high-speed reverse geocoding method for Location-based Service. In geocoding, the longitude and latitude become mutually convertible with the “area name.” The “area name” is an address and landmark name such as “Koganei City” and “Tokyo Tower” that are easy for the user to(More)
We propose a group synchronization method for VoD services based on syncing user PC internal clocks. A group synchronization video watching service enables users to simultaneously watch video along with communication functions. This service enables users to communicate with other group members online as if the group members were watching the video in the(More)
We designed a scalable distributed wireless network emulator for high-speed mobility. Wireless network emulators provide various conditions of mobile nodes' dynamics and wireless links to real implementation of protocols to be evaluated based on user-defined mobility scenarios. The target of the proposed emulator is IP-based protocols for large-scale mobile(More)
We have implemented an FPGA accelerator, which realizes higher performance by executing a part of a Java source code executable in hardware, to accelerate Java execution in an Android mobile terminal. Between an Intel Atom processor which executes a Dalvik virtual machine and an FPGA accelerator, we have implemented PCI Express interface which performs high(More)
One of the problems affecting sensor networks for natural environments is the attenuation of radio waves due to high humidity, and the attenuation is worst in the case of a 2.4 GHz radio wave. We are developing a transmission control method that estimates communication environment fluctuations caused by changes in the natural environment. This paper(More)
An end-to-end delay analysis method is proposed for the datacenter network, the topology of which is N-stage tandem LAN switches with variable bandwidth links. According to the characteristics of burst (ON/OFF) traffic in the datacenter network, the arrival traffic to the switches is modeled as a series of rectangular traffic elements. By analyzing the(More)
The IEEE 1588 Precision Time Protocol Version 2 (PTP v2) standard was developed to establish precise synchronization protocols for distributed nodes, and thus facilitate the development of distributed time-based systems. As an example of an applied system, we developed a distributed wireless network emulator that permits precise and stable synchronized(More)