NAKACHI Takayuki




Researcher Number(JSPS Kakenhi)


Laboratory Address

1 Senbaru,Nishihara,Okinawa 903-0213

Mail Address

E-mail address

Laboratory Phone number


Homepage URL


Dr. Takayuki Nakachi is a Professor of the Information Technology Center in University of the Ryukyus. He received the Ph.D. degree in electrical engineering from Keio University, Tokyo, Japan, in 1997. Since he joined Nippon Telegraph and Telephone Corporation (NTT) in 1997, he has been engaged in research on super-high-definition image/video coding, media transport technologies. From 2006 to 2007, he was a visiting scientist at Stanford University. He also actively participates in MPEG international standardization. His current research interests include secure and light-weight AI technologies based on sparse modeling, and communication science. He received the 26th TELECOM System Technology Award, the 6th Paper Award of Journal of Signal Processing and the Best Paper Award of IEEE ISPACS2015. Dr. Nakachi is a member of the Institute of Electrical and Electronics Engineers the Institute of Electronics (IEEE) and the Information and Communication Engineers (IEICE) of Japan.

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Current Affiliation Organization 【 display / non-display

  • Duty   University of the Ryukyus   Information Technology Center   Professor  

Academic degree 【 display / non-display

  • Keio University -  Ph. D.

External Career 【 display / non-display

  • 1997.04

    NTT Network Innovation Laboratories, Nippon Telegraph and Telephone Corporation  

  • 2006.09

    Visiting Scientist, Stanford University  

Affiliated academic organizations 【 display / non-display


    IEEE (Institute of Electrical and Electronics Engineers) 


    The Institute of Electronics, Information and Communication Engineers 

  • 2010.01

    IEEE    ISPACS International Steering Committee

  • 2018.05

    IEICE    Chair, Technical Committee on Smart Info-Media Systems (SIS)

  • 2020.06

    IEICE    Adviser, Technical Committee on Smart Info-Media Systems (SIS)

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Research Interests 【 display / non-display

  • Data Science

  • Edge AI Machine Learning

  • Secure Signal Processing

  • Super-high Definition Image/Video Coding

  • Channel Coding

Research Areas 【 display / non-display

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Communication and network engineering

  • Informatics / Information security

  • Informatics / Intelligent informatics

Published Papers 【 display / non-display

  • A Light-weight Online Learning Framework for Network Traffic Abnormality Detection

    Yitu Wang, Runqi Dong, Takayuki Nakachi, Wei Wang

    IEEE Wireless Communications and Networking Conference (WCNC2023) ( IEEE )    2023.03 [ Peer Review Accepted ]

    Type of publication: Research paper (international conference proceedings)

  • Light Weight Scrambled JPEG XS Coding for Privacy Protection

    Takayuki Nakachi, Hiroyuki Kimiyama, Mitsuru Maruyama

    IEEE International Symposium on Intelligent Signal Processing and Communications Systems (ISPACS 2022)     2022.11 [ Peer Review Accepted ]

    Type of publication: Research paper (international conference proceedings)

  • Uncompressed 8K Video Processing on Edge Computing

    Katsuhiro Sebayashi, Mitsuru Maruyama, Hajime Iwata, Hiroyuki Kimiyama, Takayuki Nakachi, Kouta Aoki, Yasuhisa Kato, Shigeo Urushidani, Takeshi Kurimoto, Eiji Kawai, Hideki Otsuki, Kazumasa Kobayashi

    The International Conference for High Performance Computing, Networking, Storage, and Analysis (SC22)     2022.11 [ Peer Review Accepted ]

    Type of publication: Research paper (international conference proceedings)

  • Pattern Discovery and Multi-slot-ahead Forecast of Network Traffic: A Revisiting to Gaussian Process

    Yitu Wang, Takayuki Nakachi, Wei Wang

    IEEE Transactions on Network and Service Management     2022.10 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

  • Proposal of Ultra-high-resolution Video Delivery System on Edge-cloud Environment

    Hiroyuki Kimiyama, Mitsuru Maruyama, Takayuki Nakachi

    IEEE International Conference on Consumer Electronics (ICCE-TW 2022)     2022.06 [ Peer Review Accepted ]

    Type of publication: Research paper (international conference proceedings)

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Books 【 display / non-display

  • Anomaly Detection technology using Machine Learning and Deep Learning and Application Examples (in charge: Chap. 1 Sec. 7 Sparse modeling and its application to anomaly detection)

    Takayuki Nakachi, Others ( Part: Multiple Authorship )

    NTS Inc.  2022.12

  • Digital Signal Processing I/II

    John G, Proakis 他著, 浜田望, 田口亮, 近藤克哉, 仲地孝之 ( Part: Joint Translation )

    Kagaku Gijutsu Syuppan  2001

Other Papers 【 display / non-display

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Presentations 【 display / non-display

  • [Invited Talk] Application of Small Data-driven Machine Learning to State Estimation and Prediction of Nuclear Fusion Plasma

    Takayuki Nakachi

    3rd Plasma Informatics Workshop  2023.01  -  2023.01 

  • [Invited Talk] Ultra-high-definition Video Encoding and Transmission Technologies Using Edge Cloud for Beyond 5G Era

    Takayuki Nakachi

    Technology Research Group for Information Technology Centers  2022.09  -  2022.09 

  • [Invited Talk] Sparse Modeling in the AI Machine Learning Era

    Takayuki Nakachi

    The 35th Workshop on Circuits and Systems  2022.08  -  2022.08 

  • [Keynote Speech] Low Latency and Lightweight Video Computing in Edge Cloud Networks

    Takayuki Nakachi

    International Technical Conference on Circuits/Systems, Computers, and Communications (ITC-CSCC2022)  2022.07  -  2022.07 

  • [Invited Lecture] Ultra-high Definition Video Coding in Network Computing Era

    Takayuki Nakachi

    LSI Design Contest 2022  (Ohama Nobumoto Memorial Hall, Ishigaki, Okinawa)  2022.03  -  2022.03 

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Industrial Property 【 display / non-display

  • Encoding Method, Decoding Method, Encoding Device, and Decoding Device

    Industrial Property No PCT/JP2004/000154  (2004.01.13)

    Patent No US9264736 B2  (2016.02.16)

    Takayuki Nakachi, Tomoko Sawabe, Tetsuro Fujii

Grant-in-Aid for Scientific Research 【 display / non-display

  • Secure edge AI machine learning that works with small amounts of data

    Grant-in-Aid for Scientific Research(C)

    Project Year: 2022.04  -  2025.03 

    Total: 3,200,000 (YEN)

Joint Research activities 【 display / non-display

  • Sparse Modeling/Gaussian Process for State Estimation and Prediction of Fusion Plasma

    Project Year: 2023.01  -  2024.02 

  • Media processing and transmission application technologies using small data driven AI

    Project Year: 2022.06  -  2023.02 

    Member: Hiroyuki Ishihara, et al. (NTT Labs.) 

    Total: 2,000,000 (YEN)

  • Machine learning works with small data and its applications to communications

    Project Year: 2021.12  -  2022.02 

    Investigator(s): Takayuki Nakachi  Member: Yitu Wang, et al. (NTT Labs.) 

    Total: 1,000,000 (YEN)

SDGs 【 display / non-display

  • セキュアデータサイエンス

  • エッジAI機械学習

  • 超高精細映像符号化・伝送

Social Activity 【 display / non-display

  • Councilor, IT Innovation and Strategy Center Okinawa