KOHEI SHIMASAKI

Last Updated :2024/10/16

Affiliations, Positions
Graduate School of Advanced Science and Engineering, Assistant Professor
Web Site
E-mail
simasakihiroshima-u.ac.jp
Self-introduction
My core research technology consists of a real-time vibration spectrum imaging system with pixel-level short- term Fourier Transform (STFT) using high speed vision; the pixel-level STFT function for HFR images at 1000 fps or more is accelerated with its parallel-implementation on a GPU-based high-speed vision system, and power vibration spectrum images of 512x512 pixels can be obtained in real time at 30 fps. In addition, I also proposed a novel method for dynamics-based image-pattern recognition that can be used to inspect a specified vibrating pattern by computing temporal frequency responses in time-varying brightness signals at all the pixels of a high-frame-rate video sequence. The temporal frequency responses, which are the histograms of temporal frequency components in time-varying brightness signals, can be calculated using the STFT, and they are matched pixelwise with those of a reference vibrating pattern to determine whether a specific vibrating pattern is recognized. In summary, my research filed is vision-based pixel-level vibration analysis and detection using high speed vision.

Basic Information

Major Professional Backgrounds

  • 2022/12/01, Hiroshima University, Graduate School of Advanced Science and Engineering, Assistant Professor
  • 2019/02/01, 2022/11/30, Hiroshima University, Digital Monozukuri (Manufacturing) Education and Research Center, Specially Appointed Assistant Professor

Educational Backgrounds

  • Hiroshima university, Graduate School of Engineering, Department of System Cybernetics(Doctoral Program), Japan, 2018/04/01, 2020/09/18
  • Hiroshima university, Graduate School of Engineering, Department of System Cybernetics(Master's Program), Japan, 2016/04/01, 2018/03/23
  • Hiroshima university, Faculty of Engineering, Cluster 2, Japan, 2012/04/01, 2016/03/23

Academic Degrees

  • Hiroshima University
  • Hiroshima University

Educational Activity

  • [Bachelor Degree Program] School of Engineering : Cluster 2(Electrical, Electronic and Systems Engineering) : Program of Electrical,Systems and Information Engineering
  • [Master's Program] Graduate School of Innovation and Practice for Smart Society
  • [Master's Program] Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Electrical, Systems, and Control Engineering Program
  • [Master's Program] Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Smart Innovation Program

Research Fields

  • Engineering;Electrical and electronic engineering;Measurement engineering

Research Keywords

  • High-speed vision, Vibration spectrum imaging, Sensing, Model-based measurement

Affiliated Academic Societies

  • The Institute of Electrical Engineers of Japan
  • The Ornithological Society of Japan
  • IEICE, 2023/02
  • The Japan Society of Mechanical Engineers
  • The Iron and Steel Institute of Japan
  • IEEE

Educational Activity

Course in Charge

  1. 2024, Liberal Arts Education Program1, 1Term, Introductory Seminar for First-Year Students
  2. 2024, Liberal Arts Education Program1, 1Term, Introductory Seminar for First-Year Students
  3. 2024, Undergraduate Education, 3Term, Exercises in Measurement and Control Engineering
  4. 2024, Undergraduate Education, Year, Graduation Thesis
  5. 2024, Graduate Education (Master's Program) , 1Term, Special Exercises on Smart Innovation A
  6. 2024, Graduate Education (Master's Program) , 2Term, Special Exercises on Smart Innovation A
  7. 2024, Graduate Education (Master's Program) , 3Term, Special Exercises on Smart Innovation B
  8. 2024, Graduate Education (Master's Program) , 4Term, Special Exercises on Smart Innovation B
  9. 2024, Graduate Education (Master's Program) , Academic Year, Special Study on Smart Innovation
  10. 2024, Graduate Education (Master's Program) , 1Term, Practice on Model-Based Systems Design III

Research Activities

Academic Papers

  1. A Visual-Feedback-Based Active Light-Section 3-D Reconstruction Method for Moving Objects, IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, 73, 2024
  2. A Novel Dynamic Light-Section 3D Reconstruction Method for Wide-Range Sensing, SENSORS, 24(12), 202406
  3. High-Magnification Object Tracking with Ultra-Fast View Adjustment and Continuous Autofocus Based on Dynamic-Range Focal Sweep, SENSORS, 24(12), 202406
  4. Smart Inspection Monitoring Using High-Speed Camera, Journal of Japan Institute of Electronics Packaging, 27(2), 187-191, 20240301
  5. HFR-Video-Based Fingertip Velocimeter for Multifinger Tapping Detection, IEEE SENSORS JOURNAL, 23(10), 10673-10682, 20230515
  6. HFR-Video-Based Stereo Correspondence Using High Synchronous Short-Term Velocities, SENSORS, 23(9), 20230426
  7. An Active Multi-Object Ultrafast Tracking System with CNN-Based Hybrid Object Detection, SENSORS, 23(8), 20230421
  8. Real-Time Vibration Visualization Using GPU-Based High-Speed Vision, JOURNAL OF ROBOTICS AND MECHATRONICS, 34(5), 1011-1023, 202210
  9. Multi-Thread AI Cameras Using High-Speed Active Vision System, JOURNAL OF ROBOTICS AND MECHATRONICS, 34(5), 1053-1062, 202210
  10. Development of a Multi-User Remote Video Monitoring System Using a Single Mirror-Drive Pan-Tilt Mechanism, JOURNAL OF ROBOTICS AND MECHATRONICS, 34(5), 1122-1132, 202210
  11. View and Scanning-Depth Expansion Photographic Microscope Using Ultrafast Switching Mirrors, IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, 71, 20220208
  12. ★, Wide-area Operation Monitoring of Conveyors Using a Panoramic Vibration Camera, ISIJ INTERNATIONAL, 61(10), 2587-2596, 20211015
  13. High-frame-rate Video-based Multicopter Tracking System Using Pixel-level Short-time Fourier Transform, JOURNAL OF INTELLIGENT & ROBOTIC SYSTEMS, 103(2), 20210930
  14. Wide-area Operation Monitoring of Conveyors Using a Panoramic Vibration Camera, TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN, 107(8), 633-643, 20210801
  15. Visual-Feedback-Based Frame-by-Frame Synchronization for 3000 fps Projector-Camera Visual Light Communication, ELECTRONICS, 10(14), 20210708
  16. Identification of Bridge Deterioration Using Rate of Change of Deflection Influence Lines and Deflection Curves, Journal of the Japanese Society for Experimental Mechanics, 21(2), 97-103, 20210703
  17. Single-Camera-Based Bridge Structural Displacement Measurement with Traffic Counting, SENSORS, 21(13), 20210701
  18. A Simultaneous Multi-Object Zooming System Using an Ultrafast Pan-Tilt Camera, IEEE SENSORS JOURNAL, 21(7), 9436-9448, 20210401
  19. A 500-Fps Pan-Tilt Tracking System With Deep-Learning-Based Object Detection, IEEE ROBOTICS AND AUTOMATION LETTERS, 6(2), 691-698, 202104
  20. Projection-mapping-based object pointing using a high-frame-rate camera-projector system, ROBOMECH JOURNAL, 8(1), 20210301
  21. 500-Fps Omnidirectional Visual Tracking Using Three-Axis Active Vision System, IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, 70, 20210125
  22. HFR Projector Camera Based Visible Light Communication System for Real-Time Video Streaming, SENSORS, 20(18), 20200919
  23. ★, HFR-Video-Based Honeybee Activity Sensing, IEEE SENSORS JOURNAL, 20(10), 5575-5587, 20200515
  24. Ironworks Conveyor Monitoring Using Mirror-drive High-speed Active Vision, ISIJ INTERNATIONAL, 60(5), 960-970, 20200515
  25. Omnidirectional Panoramic Video System With Frame-by-Frame Ultrafast Viewpoint Control, IEEE ROBOTICS AND AUTOMATION LETTERS, 7(2), 4086-4093, 202204
  26. Ironworks Conveyor Monitoring Using Mirror-drive High-speed Active Vision, TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN, 106(2), 61-70, 20200131
  27. A Study on High-Speed-Vision-Based Vibration Spectrum Imaging
  28. Real-time high-resolution video stabilization using high-frame-rate jitter sensing, ROBOMECH JOURNAL, 6(1), 20191115
  29. A Tandem Marker-Based Motion Capture Method for Dynamic Small Displacement Distribution Analysis, Journal of Robotics and Mechatronics, 31(5), 671-685, 20191020
  30. A fast vibration source tracking algorithm using pixel-level digital filters, Transactions of the JSME (in Japanese), 84(857), 17-00469, 20180125

Invited Lecture, Oral Presentation, Poster Presentation

  1. An Active Tacking and Projection-Based 3D Reconstruction Method for Moving Objects, Chen Mengjuan, Shimasaki Kohei, Hu Shaopeng, Gu Qingy, Ishii Idaku, 2024 IEEE Conference on Advanced Robotics and its Social Impact(ARSO2024), 2024/05/22, Without Invitation, English, IEEE, Hong Kong, China
  2. A Mid-air Multi-touch Interface using an Ultrafast Pan-tilt Camera, Yuta Abe, Taishi Iriyama, Takashi Komuro, Kohei Shimasaki, Ishii Idaku, CHI 2024, 2024/05/15, Without Invitation, English, ACM, Hawaiʻi, USA
  3. Pixel-level Vibration Imaging for Flying Objects with Translational Slide Image Sequences, Kohei Shimasaki, Tomoaki Okamura and Idaku Ishii, 3rd International Conference on Image Processing and Robotics(ICIPRoB2024), 2024/03/10, Without Invitation, English, IEEE, Sri Lanka
  4. Camera Relay System Using a Motor Equipped with a Mechanical Brake to Capture Micro-Vibrations of Moving Objects, Kohei Shimasaki, Shun Yojima, Wang Feiyue, Idaku Ishii, Harada Yuji, The 2024 IEEE/SICE International Symposium on System Integration (SII 2024), 2024/01/11, Without Invitation, English, IEEE, Ha Long, Vietnam
  5. Smart inspection monitoring using high-speed vision, Kohei Shimasaki, IEEE - Sri Lanka Robotics Meetup, 2023/12/28, Without Invitation, English, IEEE, online
  6. Remote Vibration Haptization System Using High-Speed Active Vision, Kotaro Fujita, Feiyue Wang, Kohei Shimasaki, Idaku Ishii, The 16th edition of the IEEE International Symposium on Robotic and Sensors Environments (IEEE ROSE 2023), 2023/11/07, Without Invitation, English, IEEE, Tokyo, Japan
  7. HFR video-Based Hornet Detection Approach Using wing-Beat Frequency Analysis, Junhao Li, Kohei Shimasaki, Abudoureheman Tuniyazi, Idaku Ishii, Mari Ogihara, Mikio Yoshiyama, IEEE SENSORS 2023, 2023/11/01, Without Invitation, English, IEEE, Vienna, Austria
  8. Smart Telescope System with Automatic Tracking, Kohei Shimasaki , Masaru Ito, Shaopeng Hu, Feiyue Wang and Idaku Ishii, IEEE SENSORS 2023, 2023/10/30, Without Invitation, English, IEEE, Vienna, Austria
  9. Wheel Behavior Measurement Based on Ultra-High-Speed Zoom-Tracking Video Shooting, Takuto Ogata, Shaopeng Hu, Feiyue Wang, Kohei Shimasaki, Idaku Ishii, IECON 2023, 2023/10/18, Without Invitation, English, IEEE, Singapore
  10. Long-distance avian identification approach based on high-frame-rate video, Junhao Li, Kohei Shimasaki, and Idaku Ishii, IEEE International Conference on Automation Science and Engineering (CASE) 2023, 2023/08/26, Without Invitation, English, IEEE, Auckland, New Zealand
  11. A High-Speed Stereo Monitoring System for Remote One-Man Operation, Jiahua Wang, Qing Li, Shaopeng Hu, Kohei Shimasaki, Idaku Ishii, 2023 IEEE Sensors Applications Symposium (SAS), 2023/07/19, Without Invitation, English, IEEE, Carleton University, Ottawa, Canada
  12. Wide -Area Vibration Monitoring of Ironworks Conveyors Using Panoramic High-Speed Vision, Idaku Ishii, Kohei Shimasaki, The 22nd World Congress of the International Federation of Automatic Control, 2023/07/12, With Invitation, English, IFAC, Yokohama
  13. Vibration Auralization System Using High-Speed Vision, Kotaro Fujita, Feiyue Wang, Kohei Shimasaki, Idaku Ishii, Ryo Okamoto, Hironori Higashida, Ryo Okamoto, Hironori Higashida, the 32nd International Symposium on Industrial Electronics (ISIE) 2023, 2023/06/20, Without Invitation, English, IEEE, Aalto University, Helsinki-Espoo, Finland
  14. Micro vibration detection using pan-tilt, high-speed, zoomed-in vision, Kohei Shimasaki, Feiyue Wang, Shaopeng Hu, Idaku Ishii, The 9th International Conference on Manufacturing, Machine Design and Tribology - ICMDT 2023, 2023/03/10, Without Invitation, English, the Korean Society of Mechanical Engineers, Ramada Plaza JejuHotel, Korean
  15. Vibration Sound-Play System Using High-Speed Vision, Kotaro Fujita, Feiyue Wang, Kohei Shimasaki, and Idaku Ishii, The 9th International Conference on Manufacturing, Machine Design and Tribology - ICMDT2023, 2023/03/10, Without Invitation, English, The Korean Society of Mechanical Engineers, Ramada Plaza Hotel, Jeju island, Korea
  16. A honeybee camera that captures visiting flowers, Kohei Shimasaki, JunhaoLi, Hironori Yoshida, Idaku Ishii, Mari Ogihara, Mikio Yoshiyama, International Symposium on Life Mechatronics 2023 in Phnom Penh, 2023/03/06, With Invitation, English, Committee of Life Mechatronics Symposium (LMS) Perceptual Information on C-branch (CPI) in the institute of electrical engineers of Japan (IEEJ), Institute of Technology of Cambodia (ITC), Phnom Penh, Cambodia
  17. Software-Based Rotation Sensor Using High-Speed Video Analysis, Feiyue Wang, Fujian Ding, Kohei Shimasaki, Shaopeng Hu and Idaku Ishii, IEEE SENSORS 2022, 2022/11/01, Without Invitation, English, IEEE, Dallas, Texas USA
  18. Dual-camera High Magnification Surveillance System with Non-delay Gaze Control and Always-in-focus Function in Indoor Scenes, Tianyi Zhang, Shaopeng Hu, Kohei Shimasaki, Idaku Ishii, and Akio Namiki, 2022 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), 2022/10/25, Without Invitation, English, IEEE, Kyoto, Japan
  19. Omnidirectional Panoramic Video System with Frame-by-frame Ultrafast Viewpoint Control, Shaopeng Hu, Hongyu Dong, Kohei Shimasaki, Mingjun Jiang, Taku Senoo, and Idaku Ishii, IEEE International Conference on Robotics and Automation, 2022/05/24, Without Invitation, English, IEEE, Online
  20. Multi-Person Authentication Using an Ultrafast Pan-Tilt Camera, Liheng Shen, Shaopeng Hu, Kohei Shimasaki, and Idaku Ishii, The 12th International Conference on Optics-photonics Design and Fabrication, 2021/06/04, Without Invitation, English, Optics-photonics Design and Fabrication, Online
  21. View and Depth Expansion System for Microscope Photography Based on Dual Ultrafast Switching Mirror, Shaopeng Hu, Wei Lu, Kohei Shimasaki, and Idaku Ishii, The 12th International Conference on Optics-photonics Design and Fabrication, 2021/06/04, Without Invitation, English, Optics-photonics Design and Fabrication, Online
  22. An Omnidirectional Multicopter Tracking System with HFR-Video-Based Vibration Source Localization, Mingjun Jiang, Ryo Sogabe, Kohei Shimasaki, Taku Senoo, and Idaku Ishii, 7th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization, 2021/03/12, Without Invitation, English, IEEJ, Online
  23. Vibration-feature-based Multicopter Detection with CNN-based Appearance Validation, Raut Sushil, Kohei Shimasaki, Taku Senoo, and Idaku Ishii, 7th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization, 2021/03/12, Without Invitation, English, IEEJ, Online
  24. A Long-Time Automated Honeybees Count System Using High-Speed Vision, Hironori Yoshida, Kohei Shimasaki, Taku Senoo, Idaku Ishii, and Kazuhiko Yamamoto, 2021 IEEE/SICE International Symposium on System Integration, 2021/01/13, Without Invitation, English, IEEE / SICE, Online
  25. Simultaneous Multi-face Zoom Tracking for 3-D People-Flow Analysis with Face Identification, Liheng Shen, Shaopeng Hu, Kohei Shimasaki, Taku Senoo, Idaku Ishii, The 16th International Conference on Mobility, Sensing and Networking, 2020/12/18, Without Invitation, English, IEEE, Online
  26. Super-telephoto Drone Tracking Using HFR-video-based Vibration Source Localization, Nagahiro Fujiwara, Kohei Shimasaki, Mingjun Jiang, Takeshi Takaki, and Idaku Ishii, 2019 IEEE International Conference on Robotics and Biomimetics (ROBIO), 2019/12/09, Without Invitation, English, IEEE, Dali, China
  27. A Dual-Camera-Based Ultrafast Tracking System for Simultaneous Multi-target Zooming, Shaopeng Hu, Kohei Shimasaki, Mingjun Jiang, Takeshi Takaki, and Idaku Ishii, 2019 IEEE International Conference on Robotics and Biomimetics (ROBIO), 2019/12/08, Without Invitation, English, IEEE, Dali, China
  28. Structural Displacement Measurement with High-speed Vision System and Retro-reflective Markers, Zulhaj Aliansyah, Kohei Shimasaki, Mingjun Jiang, Takeshi Takaki, and Idaku Ishii, International Conference on Advanced Mechatronics,Intelligent Manufacture and Industrial Automation 2019, 2019/10/09, Without Invitation, English
  29. Fast and Robust Visual Tracking Via Convolutional Neural Network, Mingjun Jiang, Kohei Shimasaki, Takeshi Takaki, and Idaku Ishii, SICE Annual Conference 2019, 2019/09/13, Without Invitation, English, SICE, Hiroshima
  30. Visible Light Communication Using an HFR Camera-Projector System, Atul Sharma, Kohei Shimasaki, Takeshi Takaki, and Idaku Ishii, SICE Annual Conference 2019, 2019/09/13, Without Invitation, English, SICE, Hiroshima
  31. Informatic Projection Mapping for Simultaneous Environment Recognition, Deepak Kumar, Sushil Raut, Atul Sharma, Kohei Shimasaki, Takeshi Takaki, and Idaku Ishii, SICE Annual Conference 2019, 2019/09/13, Without Invitation, English, SICE, Hiroshima
  32. A Novel Wide-Area Drone Surveillance System Using High-Speed Vision with a 2-Axis Galvano Mirror, Nagahiro Fujiwara, Kohei Shimasaki, Mingjun Jiang, Takeshi Takaki, and Idaku Ishii, SICE Annual Conference 2019, 2019/09/13, Without Invitation, English, SICE, Hiroshima
  33. GPU-Accelerated High-Speed Vision-Based Vibration Spectrum Imaging, Kohei Shimasaki, Sushil Raut, Takeshi Takaki, and Idaku Ishii, SICE Annual Conference 2019, 2019/09/13, Without Invitation, English, SICE, Hiroshima
  34. A Real-time Drone Surveillance System Using Pixel-level Short-time Fourier Transform, Nagahiro Fujiwara, Kohei Shimasaki, Mingjun Jiang, Takeshi Takaki, and Idaku Ishii, IEEE International Symposium on Safety, Security and Rescue Robotics 2019, 2019/09/04, Without Invitation, English, IEEE, Würzburg, Germany
  35. Real-time High-speed Vision-based Vibration Spectrum Imaging, Kohei Shimasaki, Tomoaki Okamura, Mingjun Jiang, Takeshi Takaki, and Idaku Ishii, IEEE/SICE International Symposium on System Integrations 2019, 2019/01/15, Without Invitation, English, IEEE/SICE, Paris
  36. HFR-Video-Based Honeybee Activity Sensing Using Pixel-Level Short-Time Fourier Transform, Kohei Shimasaki, Mingjun Jiang, Takeshi Takaki, Idaku Ishii, and Kazuhiko Yamamoto, IEEE Sensors 2018, 2018/10/30, Without Invitation, English, IEEE Sensors, Delhi
  37. Pixel-Level Vibration Source Detection Using Undersampled Video Sequences, Nagahiro Fujiwara, Kohei Shimasaki, Mingjun Jiang, Takeshi Takaki, and Idaku Ishii, IEEE Sensors 2018, 2018/10/29, Without Invitation, English, IEEE Sensors, Delhi
  38. HFR-video-based Image Pattern Recognition Using Pixel-level Temporal Frequency Response Matching, Kohei Shimasaki, Tomoaki Okamura, Mingjun Jiang, Takeshi Takaki, Idaku Ishii, and Kazuhiko Yamamoto, IEEE International Conference on Automation Science and Engineering 2018, 2018/08/22, Without Invitation, English, IEEE, Munich
  39. Real-Time Multicopter Detection Using Pixel-Level Digital Filters for Frame-Interpolated High-Frame-Rate Images, Kohei Shimasaki, Mingjun Jiang, Takeshi Takaki, Idaku Ishii, IEEE/ASME International Conference on Advanced Mechatronics 2018, 2018/07/10, Without Invitation, English, IEEE/ASME, Auckland
  40. High-frame-rate Video Analysis for Mobile Vibration-based Crop Inspection, Kohei Shimasaki, Sushil Raut, Mingjun Jiang, Takaki Takeshi, and Idaku Ishii, the 1st International Conference of Rural Technology Action Group, 2018/03/09, Without Invitation, English, Delhi
  41. Super High-Speed Vision Platform That Can Process 1024x1024 Images in Real Time at 12500 Fps, Atul Sharma, Kohei Shimasaki, Qingyi Gu, Jun Chen, Tadayoshi Aoyama, Takeshi Takaki, Idaku Ishii, Koichi Tamura, and Kenji Tajima, SII2016, 2016/12/14, Without Invitation, English, The Society of Instrument and Control Engineers, Sapporo

Awards

  1. 2024/03/10, Research Encouragement Award, General Chair, ICIPRoB 2024 Award Co-Chair, ICIPRoB2024 Award Co-Chair, ICIPRoB2024, Pixel-level Vibration Imaging for Flying Objects with Translational Slide Image Sequences
  2. 2023/11/07, BEST PAPER AWARD, General Chair of ROSE2023, Remote Vibration Haptization System Using High-Speed Active Vision
  3. 2023/03/16, Best Presentation Award, ICIA 2023: XVII. International Conference on Intelligent Agriculture, Vibration Imaging Method for Vibrating Objects with Translation
  4. 2021/06/01, Student Paper Award, The 12th International Conference on Optics-photonics Design and Fabrication, Multi-Person Authentication Using an Ultrafast Pan-Tilt Camera
  5. 2018/10, 1st Place Oral Student Paper Award, IEEE Sensors, IEEE Sensors 2018, 1st Place Oral Student Paper Award

Patented

  1. Patent, 6842126, 2021/02/24
  2. Patent, 6842218, 2021/02/24

External Funds

Acceptance Results of Competitive Funds

  1. NEDO Entrepreneurs Program (NEP), Active vibration camera fully grasps flying objects in a wide space, 2023/06/13, 2024/03/31
  2. Transport and Tourism construction technology research and development subsidy, Development of inspection and diagnosis system and infrastructure maintenance management platform for small and medium span bridges, 2021/04/01, 2023/03/31
  3. JST START University Ecosystem Promotion Type Startup Ecosystem Formation Support, Development of an active vibration camera that instantly captures flying objects, 2022/10/01, 2023/03/31
  4. Grant-in-Aid for Scientific Research(B), Full-field sensing of medium- and small-span bridges using 4K high-speed cameras and construction of infrastructure maintenance DB, 2023/04/01, 2026/03/31
  5. Grants in Aid for Scientific Research, Research on active bee cameras for wide-area flower visitation monitoring, 2022/04/01, 2025/03/31
  6. 2020/04/01, 2022/03/31