Faculty Information - Funasaka Junichi |

（Last updated : 2024-04-26 12:57:52）

Funasaka Junichi

Department / Course Hiroshima City University Graduate School Graduate School of Information Sciences Major in Computer and Network Engineering

Hiroshima City University Faculty of Information Sciences Department of Computer and Network Engineering

Job Associate Professor

Business career
2009/04/01 ～	Associate Professor Hiroshima City University Graduate School Graduate School of Information Sciences Major in Computer and Network Engineering
2007/04/01 ～ 2009/03/31	Lecturer Assistant Professor, Dept. of Computer Engineering, Graduate School of Information Sciences
1999/10/01 ～ 2007/03/31	Research Assistant Research Associate, Department of Computer Engineering, Faculty of Information Sciences

Academic background
1999/09 Degree Acquisition	Ph. D.
1997/04～1999/09	Doctoral Program (2nd Semester) Graduate School of Information Science Nara Institute of Science and Technology Finished


He has 22 years' experience in teaching and researching. His interest includes Internet computing. The following is a typical abstract of his research. (abstract) To yield better and more stable performance on complex networks, on which packet losses often occur and many paths are available. To yield better performance on highly lossy networks, a segmented file download method composed of both Time-to-Live（TTL）based PR-SCTP which limits the retransmission time and unordered delivery which alleviates the influence of Head-Of-Line blocking problem has been proposed． However, the existing method did not take the arrival order of blocks into account. In this paper, since the method can be applied to order-sensitive applications such as HTTP streaming, we evaluate the occurrence of out-of-order arrivals as well as the download time. Two methods, the delayed retrying method (DR) which does not worry the arrival order at all and the stochastic delayed retrying method (SDR), are proposed to be compared to the existing method. From the results obtained by the emulated network with real machines and prototype programs, the existing method rarely suffers from out-of-order arrivals while it requires longer time if the TTL, which limits the back-off duration, is set to a large time. It is also confirmed that SDR can adjust the possibility of out-of-order arrivals and DR can yield a stable performance to download a file in a short time.

Present specialized field
Computer System Network keyword(Internet, Network Cache, Contents Delivery, P2P network, Network proxy)


2004	Speed control on file distribution over P2P networks
2002	Parallel downloading method

Research topic, funded research, and department laboratory expense
2003/04/01 ～ 2005/03/31	System design for consistency assurance of Peer-to-Peer networks

Book and thesis
Papers	Implementation of Proxy to Make Content Shared on BitTorrent Retrievable from CCN Proc. 2024 International Conference on Computing, Networking and Communications (ICNC),pp.888-893 (Co-authored) 2024/02/21
Papers	Evaluation on Segmented File Download Methods Using Parallel TCP/MPTCP Connections on Multiple Paths IEEE Proc. Cyber Science adn Technology Congress,pp.214-219 (Co-authored) 2023/11/17
Papers	Content Delivery Methods Considering Both Emergency and Demand for Neighbor Cooperative Offloading System IEEE 11th Global Conference on Consumer Electronics (GCCE2022) (Sole-authored) 2022/10/21
Papers	Timer-driven Progressive Download Scheme Utilizing Multiple Connections on Multiple Paths IPSJ Journal,pp.634-644 (Sole-authored) 2022/02/15
Papers	Performance Evaluation on Concurrent Connecting QUIC and TCP Nodes over Wireless LAN Proc. 3rd International Conference on Computer Communication and the Internet (ICCCI),pp.8pages (Co-authored) 2021/06/25
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Academic conference presentation
2023/11/17	Evaluation on Segmented File Download Methods Using Parallel TCP/MPTCP Connections on Multiple Paths (IEEE Cyberscience Congress 2023)
2022/10/21	Content Delivery Methods Considering Both Emergency and Demand for Neighbor Cooperative Offloading System (IEEE 11th Global Conference on Consumer Electronics (GCCE2022))
2022/04/15	On Control Parameters of Segmented File Downloading Using PR-SCTP on WebRTC
2020/11/25	Evaluation on Progressive Download Methods Based on Timer-Driven Requesting Schemes on Multiple Paths with Shared Links (Proc. 2020 Eighth International Symposium on Computing and Networking Workshops (CANDARW))
2019/11/05	Number of TCP Connections to Saturate Bandwidth of Wireless Networks (12th International Conference on Mobile Computing and Ubiquitous Networking (ICMU 2019))
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