Gotoh Lab.

Research Topics

	Division-based Broadcasting In general broadcasting systems, although the server can broadcast the same movie data to many clients repetitively, users have to wait until they finish receiving data and play it. We propose scheduling methods to reduce waiting time. Also, we design and implement the division-based broadcasting system of movie data called ``TeleCaS''. Yusuke Gotoh and Akihiro Kimura: Implementation and Evaluation of Division-based Broadcasting System for Webcast, Journal of Digital Information Management (JDIM), Vol. 13, Issue 4, pp. 234-246, (Aug. 2015).

Division-based Broadcasting

In general broadcasting systems, although the server can broadcast the same movie data to many clients repetitively, users have to wait until they finish receiving data and play it. We propose scheduling methods to reduce waiting time. Also, we design and implement the division-based broadcasting system of movie data called ``TeleCaS''.
Yusuke Gotoh and Akihiro Kimura: Implementation and Evaluation of Division-based Broadcasting System for Webcast, Journal of Digital Information Management (JDIM), Vol. 13, Issue 4, pp. 234-246, (Aug. 2015).

	Selective Contents Broadcasting Selective contents, i.e., watching contents selected by users themselves, have attracted great attention. In a news program, after a user selects an interesting content, he/she watches it. In selective contents broadcasting, since the server needs to deliver many contents, users may wait to play the data. We propose scheduling methods to reduce waiting time. Also, we design and implement the broadcasting system of selective contents called ``Corne''. Yusuke Gotoh, Tomoki Yoshihisa, Masanori Kanazawa, Yutaka Takahashi: A Broadcasting Scheme for Selective Contents Considering Available Bandwidth, IEEE Transactions on Broadcasting, Vol. 55, Issue 2, pp. 460-467, (Jun. 2009).

Selective Contents Broadcasting

Selective contents, i.e., watching contents selected by users themselves, have attracted great attention. In a news program, after a user selects an interesting content, he/she watches it. In selective contents broadcasting, since the server needs to deliver many contents, users may wait to play the data. We propose scheduling methods to reduce waiting time. Also, we design and implement the broadcasting system of selective contents called ``Corne''.
Yusuke Gotoh, Tomoki Yoshihisa, Masanori Kanazawa, Yutaka Takahashi: A Broadcasting Scheme for Selective Contents Considering Available Bandwidth, IEEE Transactions on Broadcasting, Vol. 55, Issue 2, pp. 460-467, (Jun. 2009).

	Hybrid Broadcasting Due to the recent popularization of grid environments, streaming delivery using broadcast and telecommunication methods is attracting great attention. In hybrid webcast environments, the server constructs a hybrid delivery that delivers data to clients using both broadcasting and telecommunication channels. We propose delivery methods to reduce waiting time., Also, we design and implement the delivery system for hybrid broadcasting called ``Brossom''. Yusuke Gotoh, Tomoki Yoshihisa, Hideo Taniguchi, Masanori Kanazawa: Brossom: A P2P Streaming System for Webcast, Journal of Networking Technology, Vol. 2, Issue 4, pp. 169-181, (Dec. 2011).

Hybrid Broadcasting

Due to the recent popularization of grid environments, streaming delivery using broadcast and telecommunication methods is attracting great attention. In hybrid webcast environments, the server constructs a hybrid delivery that delivers data to clients using both broadcasting and telecommunication channels. We propose delivery methods to reduce waiting time., Also, we design and implement the delivery system for hybrid broadcasting called ``Brossom''.
Yusuke Gotoh, Tomoki Yoshihisa, Hideo Taniguchi, Masanori Kanazawa: Brossom: A P2P Streaming System for Webcast, Journal of Networking Technology, Vol. 2, Issue 4, pp. 169-181, (Dec. 2011).

	Information Search in Spatial Computing Due to the continued popularization of Geographic Information System (GIS), spatial network environments that can display the changes of spatial axes in mobile phones are receiving great attention (ex. Searching gas stations, restaurants, etc.). We propose and evaluate searching methods for k-Nearest Neighbor (kNN), Reverse k-Nearest Neighbor (RkNN), and Bichromatic-RkNN (BRkNN). Yusuke Gotoh and Chitose Okubo: A Proposition of Querying Scheme with Network Voronoi Diagram in Bichromatic Reverse k-nearest Neighbor, International Journal of Pervasive Computing and Communications (IJPCC), Vol. 13, Issue 1, pp. 62-75, (May. 2017).

Information Search in Spatial Computing

Due to the continued popularization of Geographic Information System (GIS), spatial network environments that can display the changes of spatial axes in mobile phones are receiving great attention (ex. Searching gas stations, restaurants, etc.). We propose and evaluate searching methods for k-Nearest Neighbor (kNN), Reverse k-Nearest Neighbor (RkNN), and Bichromatic-RkNN (BRkNN).
Yusuke Gotoh and Chitose Okubo: A Proposition of Querying Scheme with Network Voronoi Diagram in Bichromatic Reverse k-nearest Neighbor, International Journal of Pervasive Computing and Communications (IJPCC), Vol. 13, Issue 1, pp. 62-75, (May. 2017).