Director

Education:

Ph.D., Mechanical Engineering, Chiba University, 2006

Concentrations: Mechanical Engineering, Mechatronics, Control Engineering

Dissertation: A Study of High-Precision Head-Positioning Control in Hard Disk Drives

M.A, Mechanical Engineering, Chiba University, 1999

Concentrations: Mechanical Engineering, Control Engineering

Thesis: A Study of Following Control of Hard Disk Drives by Using Sampled-Data H∞ Control

B.A, Mechanical Engineering, Chiba University, 1997

Work Experiences: 

• Chiba Institute of Technology, Narashino 

Professor in Mechanical Engineering Division, April 2018 - present

Associate Professor in Mechanical Engineering Division, October 2015 - March 2018

• HGST Japan, Ltd. Fujisawa 

Senior Researcher, October 2013 - September 2015

• Hitachi, Ltd, Tokyo 

Senior Researcher, October 2011 - September 2013

Researcher, April 1999 - September 2011

Research Skills: 

•  Mechatronics design

•  Digital control

•  Robust control

•  System identification

Awards and Honors:

• JSME Medal for Outstanding Paper, 2016

• JSME Medal for Outstanding Paper, 2015

• The IFAC Congress Young Author Prize, Finalist, 2008

• The IFAC Congress Application Paper Prize, Finalist, 2008

Publication List:

Chapter in Book

1. Takenori Atsumi, “Precise Positioning Control in Sampled-Data Systems”, in Advances in High-Performance Motion Control of Mechatronic Systems, Takashi Yamaguchi, Mitsuo Hirata, Chee Khiang Pang (eds.), CRC Press, Taylor and Francis Group, Boca Raton, FL, USA, 2013, in press

2. Takenori Atsumi, Mitsuo Hirata, Hiroshi Fujimoto, Nobutaka Bando, “Ultra-Precise Position Control”, in High-Speed Precision Motion Control, Takashi Yamaguchi, Mitsuo Hirata, Chee Khiang Pang (eds.), CRC Press, Taylor and Francis Group, Boca Raton, FL, USA, 2012

Journal Paper

1. Kazuho Igarashi, Ryo Igarashi, Takenori Atsumi, and Shigeyuki Nakadai, ``Feedforward Control with Sampled-Data Polynomial Based on Triangle Hold for Track Seek of Hard Disk Drive'', Journal of Advanced Mechanical Design, Systems, and Manufacturing, vol. 19, no. 2, Paper No. 25-00013, pp. 1-12, DOI:10.1299/jamdsm.2025jamdsm0020, (2025-4) 

2. Kazuho Igarashi, Ryo Igarashi, Takenori Atsumi, and Shigeyuki Nakadai, ``Feedforward Control for Track Seeking Control in Hard Disk Drive with Sampled-Data Polynomial Based on Causal First-Order Hold'', IEEJ Journal of Industry Applications, vol. 13, no. 5. pp. 512-519, (2024-9)

3. Shota Yabui, Haruki Murakami, Takenori Atsumi, and Yusuke Uchiyama, ``Adaptive Feedforward Cancellation for Precise Repetitive Motion in Coarse-Fine Control System'', IEEE Access ,vol. 12, pp. 60299-60309, (2024-5)

4. Takenori Atsumi, Toshiki Saito, Shota Yabui, Yuki Nakata, Shinsei Noshiro, and Shigeyuki Nakadai, ``Feedback Controller Optimization for Mechatronic Systems with Unexpected Plant Perturbations Using Support Vector Machine'', IEEJ Journal of Industry Applications, vol. 13, no. 3. pp. 270-279, (2024-5) 

5. Takeru Watanabe, Seiji Kanai, Hiroki Muto, Haruto Kogawa, Takenori Atsumi, and Shigeyuki Nakadai, ``Study of Increased Wind Noise by Active Noise Cancellation Headphones'', IEEJ Journal of Industry Applications, vol. 13, no. 2. pp. 208-214, (2024-3)

6. Takenori Atsumi, Shota Yabui, and Shigeyuki Nakadai, ``Optimization Method for Magnetic-Head Positioning Control System in HDD Against Unexpected Plant Perturbations by Using Data Mining Techniques'', The IEEE Transactions on Magnetics, vol. 60, no. 1, pp. 1-14, Jan. 2024, Art no. 3300114, doi: 10.1109/TMAG.2023.3333945.

7. Takenori Atsumi and Shota Yabui, ``Loop-Shaping Technique for Quadruple-Stage Actuator System in Hard Disk Drive'', The IEEE Transactions on Industry Applications, vol. 59, no. 4. pp. 5009--5018, (2023), DOI: 10.1109/TIA.2023.325713 

8. Shota Yabui and Takenori Atsumi, ``High-bandwidth controller design for dual-stage actuator system in hard disk drives'', Journal of Vibration and Control, vol. 29, no. 5-6, pp. 1268-1279, (2023-3)

9. Shota Yabui, Takenori Atsumi, and Tsuyoshi Inoue, ``Servo Controller Design for Triple-Stage Actuator in HDD to Compensate for High-Frequency Fan Vibration'', The IEEE Transactions on Magnetics, Vol. 58, No. 1, pp. 1-11, (2021-12), DOI: 10.1109/TMAG.2021.3129540

10. Takenori Atsumi and Shota Yabui, ``Quadruple-Stage Actuator System for Magnetic-Head Positioning System in HDDs'', The IEEE Transactions on Industrial Electronics, Vol. 67, No. 11, pp. 9184-9194, (2020-11), DOI: 10.1109/TIE.2019.2955432 

11. Hayato Kato and Takenori Atsumi, ``Improving methodology for multi-input-single-output control system using the Robust Bode plot'', Journal of Advanced Mechanical Design, Systems, and Manufacturing, Vol. 14, No. 4, Paper No. 20-00058, pp. 1-8, (2020-4), DOI: 10.1299/jamdsm.2020jamdsm0053

12. Shota Yabui, Takenori Atsumi, and Tsuyoshi Inoue, ``Compensation of mechanical resonances by adaptive feed-forward cancellation for head positioning control system in hard disk drives'', Journal of Advanced Mechanical Design, Systems, and Manufacturing, Vol. 13, No. 4, Paper No. 19-00358, pp. 1-14, (2019-11) 

13. Jun Ito and Takenori Atsumi, ``Magnetic-head positioning control of HDDs with improved H-infinity controller by Robust Controller Bode (RCBode) plot'', Journal of Advanced Mechanical Design, Systems, and Manufacturing}, Vol. 12, No. 7, Paper No. 18-00347, pp. 1-11, (2018-11) 

14. Takenori Atsumi, ``Two-degree-of-freedom control scheme for flying-height and tracking-position controls with thermal actuators in HDDs'', Journal of Advanced Mechanical Design, Systems, and Manufacturing, Vol. 12, No. 1, Paper No. 17-00470, pp. 1-15, (2018-2) 

15. Takenori Atsumi, "Flying-height and tracking-position controls with thermal-positioning actuator in hard disk drives", Journal of Advanced Mechanical Design, Systems, and Manufacturing, Vol. 11, No. 2, Paper No. 17-00107, pp. 1-11, 2017.

16. Takenori Atsumi,  “Minimization of Unobservable Oscillation in Repeatable Run-Out for Magnetic-Head Positioning System of Hard Disk Drives”, Mechatronics, Vol. 44, pp. 24-31, 2017.

17. Takenori Atsumi, “Estimation Method of Unobservable Oscillations in Sampled-Data Positioning Systems”, IEEJ Journal of Industry Applications, Vol. 6, No. 3, pp. 199-204, 2017.

18. Takenori Atsumi, “Analysis of open-loop characteristics on SISO sampled-data positioning control system”, Journal of Advanced Mechanical Design, Systems, and Manufacturing, vol. 10, no. 4, Paper No. 16-00214, pp. 1-12, 2016. 

19. Shota Yabui, Takenori Atsumi, and Shigeo Nakamura, “Improvement of convergence behavior for adaptive feed-forward control with initial values design in hard disk drives”, Microsystem Technologies, Vol. 22, No. 6, pp. 1291-1298, 2016.

20. Shota Yabui, Takenori Atsumi, and Shigeo Nakamura, “Compensation for position-dependent mechanical resonances in head-positioning control of hard disk drives”, IEEJ Transactions on Electrical and Electronic Engineering, Vol. 10, pp. S151-S158, 2015.

21. Takenori Atsumi, Kenji Suzuki, Shigeo Nakamura, and Mutsuro Ohta, “Vibration Control with Thin-Film-Coil Actuator for Head-Positioning System in Hard Disk Drives”, Journal of Advanced Mechanical Design, Systems, and Manufacturing, vol. 9, no. 1, Paper No. 14-00466, pp. 1-12, 2015. 

22. Shota Yabui, Atsushi Okuyama, Takenori Atsumi, and Itsuro Kajiwara, “A Study of Equivalence between Adaptive Learning and Loop Shaping Methods for Disturbance Compensation”, Journal of Advanced Mechanical Design, Systems, and Manufacturing, vol. 8, no. 3, Paper No. 13-00198, pp. 1-14, 2014. 

23. Takenori Atsumi, William C. Messner, “Compensating for ZOH-Induced Residual Vibrations in Head-Positioning Control of Hard Disk Drives”, The IEEE/ASME Transactions on Mechatronics, vol. 19, no. 1, pp. 258-268, 2014.

24. Shota Yabui, Itsuro Kajiwara, Shigeo Nakamura, Takenori Atsumi, “Improvement of Convergence for Adaptive Feed-forward Cancellation Using Variable Gains in a Head Positioning System of Hard Disk Drives”, Journal of Advanced Mechanical Design, Systems, and Manufacturing, vol. 7, no. 6, pp. 903-918, 2013.

25. Takenori Atsumi, Shigeo Nakamura, Masaki Odai, Irizo Naniwa, Shuya Nosaki, “Experimental Evaluation of Triple-Stage-Actuator System with Thermal Actuator for Hard Disk Drives”, Journal of Advanced Mechanical Design, Systems, and Manufacturing, vol. 7, no. 4, pp. 722-735, 2013.

26. Masaki Odai, Takenori Atsumi, Haruaki Otsuki, Toshihiro Arisaka, “Head-Positioning Control System Using Thermal Actuator in Hard Disk Drives”, Microsystem Technologies, vol. 19, no. 9-10, pp. 1483-1494, 2013.

27. Takenori Atsumi, Shigeo Nakamura, Masaru Furukawa, Irizo Naniwa, Junguo Xu, “Triple-Stage-Actuator System of Head-Positioning Control in Hard Disk Drives”, The IEEE Transactions on Magnetics, vol. 49, no. 6, 2013, 

28. Shota Yabui, Atushi Okuyama, Takenori Atsumi, Masaki Odai, “Development of Optimized Adaptive Feed-forward Cancellation with Damping Function for Head Positioning System in Hard Disk Drives”, Journal of Advanced Mechanical Design, Systems, and Manufacturing, vol. 7, no. 1, pp. 39-51, 2013

29. Takenori Atsumi, William C. Messner, “Estimation Method for Unobservable Settling Vibration of Head-Positioning Control in Hard Disk Drives”, Mechatronics, vol. 23, no. 1, pp. 37-45, 2013

30. Takenori Atsumi, Shota Yabui, “Compensation for Disk-Flutter Vibrations of Head-Positioning Control Systems in Hard Disk Drives”, Transactions of IEE Japan (in Japanese)，vol. 132-D, no. 12, pp. 1149-1158, 2012

31. Atsushi Okuyama, Shota Yabui, Takenori Atsumi, “Design Method Considering Phase Condition for Adaptive Feedforward Cancellation” , Transactions of IEE Japan (in Japanese)，vol. 132-D, no. 10, pp. 1009-1015, 2012

32. Takenori Atsumi, William C. Messner, “Analysis of Unobservable Oscillations in Sampled-Data Positioning Systems”, The IEEE Transactions on Industrial Electronics, vol. 59, no. 10, pp. 3951-3960, 2012

33. Shota Yabui, Atsushi Okuyama, Masahito Kobayashi, Takenori Atsumi, “Optimization of Adaptive Feedforward Repeatable Run-out Cancellation for Positioning Control System of Hard Disk Drives”, Microsystem Technologies, vol. 18, no. 9-10, pp. 1703-1709, 2012

34. Takenori Atsumi, William C. Messner, “Suppression of Residual Vibration of Mechanical Resonance beyond the Nyquist Frequency”, Transactions of the Japan Society of Mechanical Engineers Series C (in Japanese), vol. 78, no. 789, pp. 1362-1377, 2012

35. Takenori Atsumi, William C. Messner, “Modified Bode Plots for Robust Performance in SISO Systems with Structured and Unstructured Uncertainties”, The IEEE Transactions on Control Systems Technology, vol. 20, no. 2, pp. 356-368, 2012

36. Takenori Atsumi, William C. Messner, “Optimization of Head-Positioning Control in a Hard Disk Drive Using the RBode Plot”, The IEEE Transactions on Industrial Electronics, vol. 59, no. 1, pp. 521-529, 2012

37. Takenori Atsumi, William C. Messner, “Analysis of Residual Vibrations beyond the Nyquist Frequency in Sampled-Data Positioning Control System”, Journal of System Design and Dynamics, vol. 5, no. 7, pp. 1444-1459, 2011

38. Takenori Atsumi, William C. Messner, “Mixed Sensitivity Problem in Sampled-Data Positioning Control Systems”, Journal of System Design and Dynamics, vol. 5, no. 6, pp. 1294-1309, 2011

39. Takenori Atsumi, “Disturbance Suppression beyond Nyquist Frequency in Hard Disk Drives”, Mechatronics, vol. 20, no. 1, pp. 67-73, 2010

40. Takenori Atsumi, “Disturbance Suppression in Sampled-Data Positioning Control System”, Transactions of IEE Japan (in Japanese), vol. 129-D, no. 12, pp. 1178-1186, 2009

41. Takenori Atsumi, “Feedforward Control Using Sampled-Data Polynomial for Track Seeking in Hard Disk Drives”, The IEEE Transactions on Industrial Electronics, vol. 56, no. 5, pp. 1338-1346, 2009

42. Toshiya Shiramatsu, Takenori Atsumi, Masayuki Kurita, Yuki Shimizu, Hideaki Tanaka, “Dynamically Controlled Thermal Flying-Height Control Slider”, The IEEE Transactions on Magnetics, vol. 44, no. 11, pp. 3695-3697, 2008

43. Takenori Atsumi, Atsushi Okuyama, Shinsuke Nakagawa, “Vibration Control Above the Nyquist Frequency in Hard Disk Drives”, The IEEE Transactions on Industrial Electronics, vol. 55, no. 10, pp. 3751-3757, 2008

44. Takenori Atsumi, Atsushi Okuyama, Masahito Kobayashi, “Track- Following Control Using Resonant Filter in Hard Disk Drives”, The IEEE/ ASME Transactions on Mechatronics, vol. 12, no. 4, pp. 472-479, 2007

45. Takenori Atsumi, Toshihiko Shimizu, Toshihiro Arisaka, Hiromitsu Masuda, “Integrated Design of a Controller and a Structure for Head-Positioning in Hard Disk Drives”, Journal of Vibration and Control, vol. 12, no. 7, pp. 713-736, 2006

46. Takenori Atsumi, Toshihiro Arisaka, Toshihiko Shimizu, Hiromitsu Masuda, “Head-Positioning Control Using Resonant Modes in Hard Disk Drives”, The IEEE/ASME Transactions on Mechatronics, vol. 10, no. 4, pp. 378-384, 2005

47. Takenori Atsumi, “Head-Positioning Control Using Virtual Resonant Modes in a Hard Disk Drive”, Journal of Advanced Mechanical Design, Systems, and Manufacturing, vol. 1, no. 3, pp. 408-417, 2007

48. Takenori Atsumi, Toshihiro Arisaka, Toshihiko Shimizu, Takashi Yamaguchi, “Vibration Servo Control Design for Mechanical Resonant Modes of a Hard-Disk-Drive Actuator”, JSME International Journal Series C, vol. 46, no. 3, pp. 819-827, 2003

49. Takenori Atsumi, Shinsuke Nakagawa, Takashi Yamaguchi, Yosuke Hamada, “High-Bandwidth Servo Design for Shaping the Mechanical Resonance of the Actuator in Hard Disk Drive”, Transactions of the Japan Society of Mechanical Engineers, Series C (in Japanese), vol. 67, no. 664, pp. 3905-3910, 2001

50. Mitsuo Hirata, Takenori Atsumi, Akiyo Murase, Kenzo Nonami, “Following Control of a Hard Disk Drive Using Sampled-Data H∞ Control Theory”, Journal of the Society of Instrument and Control Engineers (in Japanese), vol. 36, no. 2, pp. 172-17, 2000

International Conference Proceedings

1. Takenori Atsumi, ``Control System Design for Track-Seek Control with HDD Benchmark Problem'', The 10th IFAC Symposium on Mechatronic Systems, pp. 857-862, (2025-7)

2. Ryutaro Tokuyama and Takenori Atsumi, ``Improvement Method for Control System in HDD with Dual-Stage Actuator Using Robust Controller Bode Plot'', The 10th IFAC Symposium on Mechatronic Systems, pp. 821-826, (2025-7)

3. Shota Yabui, Takenori Atsumi, and Atsushi Okuyama, ``AFC with Initial Value Compensation for High Precision Positioning for Track-Seek Control in HDDs'', The 10th IFAC Symposium on Mechatronic Systems, pp. 409-414, (2025-7)

4. Ryutaro Tokuyama, Satoshi Urano, and Takenori Atsumi, ``A Design Method for Quad-Stage-Actuator in HDDs Considering Stroke Limits'', The 11th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2025), pp. 403-408, (2025-3)

5. Takenori Atsumi, Shota Yabui, Atsushi Okuyama, and Masahiro Mae, ``Loop-Shaping Method with Unstable Poles for Magnetic-Head Positioning Control in Hard Disk Drive'', 2024 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM2024), pp. 818-823, (2024-7)

6. Shota Yabui and Takenori Atsumi, ``Repetitive Positioning Control for DISO Systems by Adaptive Feed-Forward Cancellation'', 2024 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM2024), pp. 812-817, (2024-7)

7. Hiroki Hoki and Takenori Atsumi, ``Compensation of Residual Vibration in Track-Seeking Control of Hard Disk Drive Using ZPETC and Sampled Data Polynomial'', The 10th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2024), pp. 537-542, (2024-3)

8. Sota Endo and Takenori Atsumi, ``Improvement of Tracking Performance of a Multicopter Flying in a Low-Ceiling Space Using RCBode Plot'',

The 10th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2024), pp. 364-369, (2024-3)

9.  Teruya Kojima and Takenori Atsumi, ``Vibration Control of Multicopters in Vortex Regions of Building Wind'', The 10th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2024), pp. 352-357, (2024-3)

10. Takeru Watanabe and Takenori Atsumi, ``Increased Wind Noise by Active Noise Cancellation Headphones'', The 10th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2024), pp. 143-148, (2024-3)

11. Shota Yabui and Takenori Atsumi, ``Control Design Strategy for Coarse-Fine Motion Control in Dual-Input-Single-Output System'', The 10th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2024), pp. 153--158, (2024-3)

12. Takenori Atsumi, ``Benchmark Problem for Magnetic-Head Positioning Control System in HDDs'', The 22nd IFAC World Congress 2023 (IFAC WC 2023), pp.9484-9490, (2023-7)

13. Shota Yabui, Takenori Atsumi and Atushi Okuyama, ``Control Scheme of RRO Compensation for Track Mis-registration in HDDs'', The 22nd IFAC World Congress 2023 (IFAC WC 2023), pp.6905-6910, (2023-7)

14. Xiaoke Wang, Wataru Ohnishi, and Takenori Atsumi, ``Systematic Filter Design by Convex Optimization for Disturbance Rejection in Dual-Stage Actuated Hard Disk Drives'', The 22nd IFAC World Congress 2023 (IFAC WC 2023), pp.11384-11389, (2023-7)

15. Takeru Watanabe, Seiji Kanai, Takenori Atsumi, `` Effects of wind noise on hybrid active noise cancellation headphones'', The 24th IEEE International Conference on Industrial Technology, ICIT23-000007, (2023-4)

16. Shiho Seiyama, Kino Takanaka, and Takenori Atsumi, ``Tracking Performance Improvement for Quadcopter in Exhaust Duct by Using RCBode Plot'', The 9th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2023), pp. 277-282, (2023-3)

17. Daiki Yoshida and Takenori Atsumi, ``Improvement of Feedback Controller for Quadcopters in Ducts by Using RCBode Plot '', The 9th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2023), pp. 283-288, (2023-3)%

18. Xiaoke Wang, Wataru Ohnishi, and Takenori Atsumi, ``Design of loop shaping filters based on convex optimization guaranteeing robust performance,'' 2022 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM), pp. 1779-1784, (2022-7),

19. Xiaoke Wang, Wataru Ohnishi, and Takenori Atsumi, ``Robust Controller Design Based on Convex Optimization and RCBode Plots Using Frequency Response Data: Application to Hard Disk Drive Systems,'' 2022 American Control Conference (ACC 2022), pp. 3358-3358, (2022-6-9)

20. Takenori Atsumi and Shota Yabui, ``Loop-Shaping Technique for Quadruple-Stage-Actuator System in Hard Disk Drive'', The 2022 International Power Electronics Conference, pp. 1337--342, (2022-5)

21. Ryohei Sato, Miyu Hirose, and Takenori Atsumi, ``A Design Method for 2DOF Control System in Inverted Pendulum Robots Using Neural Networks'', The 8th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2022), pp. 358--361, (2022-3)

22. Taiki Okada and Takenori Atsumi, ``Control System Improvement for Robot Arm with Readymade Servo Motors Using RCBode plot'', The 8th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2022), pp. 332--337, (2022-3)

23. Shota Yabui, and Takenori Atsumi, ``Design Strategy of Head Positioning Control System of HDD based on Amplitude Spectrum'', The 17th IEEE International Workshop on Advanced Motion Control, AMC22-000004, (2022-2)

24. Takenori Atsumi and Shota Yabui, ``Track-Following Control Using Resonant Filter for Dual-Stage-Actuator System in Hard Disk Drives'', The 17th IEEE International Workshop on Advanced Motion Control, AMC22-000003, (2022-2)

25. Keitaro Oriuchi, Ryota Seki, Ryu Obayashi, Hayato Kato, Takenori Atsumi, and Shigeyuki Nakadai, ``Improved Positioning Accuracy of the Multicopter for Vertically Applied Wind Disturbances'', The 7th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2021), pp. 348--349, (2021-3)

26. Ryota Seki, Keitaro Oriuchi, Ryu Obayashi, Hayato Kato, Takenori Atsumi, and Shigeyuki Nakadai, ``Improvement of Wind-Induced Tracking Error in Horizontal Direction for a Multicopter'', The 7th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2021), pp. 346--347, (2021-3)

27. Kazuho Igarashi, Ryo Igarashi, Takenori Atsumi, and Shigeyuki Nakadai, ``Feedforward Control for Track Seeking Control in Hard Disk Drive with Sampled-Data Polynomial Based on Causal First-Order Hold'', The 7th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2021), pp. 110--115, (2021-3)

28. Natsuki Kageyama, Takeshi Nishimura, Takahiro Itoh, Takenori Atsumi, and Shigeyuki Nakadai, ``Discrimination of Magnetic Attraction Reduced Area Using a Disturbance Observer for Crawler Robots'', The 7th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2021), pp. 104--109, (2021-3)

29. Natsuki Kageyama, Takeshi Nishimura, Takahiro Itoh, Takenori Atsumi, and Shigeyuki Nakadai, ``Detection of Reduced Magnetic Attraction Force Using a Disturbance Observer for Crawler Robots'', The 2021 IEEE International Conference on Mechatronics (ICM 2021), Paper-ID: TD-001457, (2021-3)

30. Kazuho Igarashi, Ryo Igarashi, Takenori Atsumi, and Shigeyuki Nakadai, ``Feedforward Control for Track-Seeking Control in Hard Disk Drive with Sampled-Data Polynomial Based on First-Order Hold'', The 2021 IEEE International Conference on Mechatronics (ICM 2021), Paper-ID: TD-001295, (2021-3)

31. Takenori Atsumi and Shota Yabui, ``Performance Comparison between Triple-stage Actuator Systems in HDDs'', The 21st IFAC World Congress 2020 (IFAC 2020), Paper-ID: 273, (2020-7)

32. Shota Yabui, Takenori Atsumi, and Tsuyoshi Inoue,  ``Controller Design Method for Stroke Reduction of Micro-actuator in HDD'', The 21st IFAC World Congress 2020 (IFAC 2020), Paper-ID: 1928, (2020-7)

33. Takenori Atsumi and Shota Yabui, ``Magnetic-Head Positioning Control with Quadruple-Stage Actuator System for HDDs'',The 6th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2020), IS-1, (2020-3)

34. Shota Yabui, Takenori Atsumi, and Tsuyoshi Inoue, ``MISO Controller Design Method for Stroke Reduction of Milli Actuator in Hard Disk Drives'', The 6th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2020), IS-2, (2020-3)

35. Hayato Kato and Takenori Atsumi, ``Improving Methodology by Using RCBode Plot for Triple-Stage-Actuator System in HDDs'', The 6th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2020), TT-17, (2020-3)

36. Toshiki Kawahira and Takenori Atsumi, ``Study of Flow-Induced Tracking Error Caused by Passing Multicopters'', The 6th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2020), TT-24, (2020-3)

37. Hayato Kato and Takenori Atsumi,  ``Control System Improvement for Triple-Stage-Actuator System of Hard Disk Drive Using the RBode Plot'', The 45th Annual Conference of the IEEE Industrial Electronics Society, pp.3117-3122, (2019-10)

38. Shota Yabui, Takenori Atsumi, and Tsuyoshi Inoue, ``Stroke Oriented Controller Design for Dual-Stage Actuator of Head Positioning Control System in Hard Disk Drives'', The 8th IFAC Symposium on Mechatronic Systems, No. TrB6.3, (2019-9)

39. Takenori Atsumi and Shota Yabui, ``Quadruple-Stage Actuator System for Hard Disk Drives'', The 8th IFAC Symposium on Mechatronic Systems, No. ThE3.4, (2019-9)

40. Toshiki Saito, Ryo Kikuchi, and Takenori Atsumi, ``Data-driven Optimization Method for Controller Parameters Using Support Vector Machine'', The 5th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2019), TT8-2, (2019-3)

41. Yoshiyuki Otsuji and Takenori Atsumi, ``Estimation of Wind Disturbance for Quadcopter in Square Tube'', The 5th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2019), TT8-1, (2019-3)

42. Toshiki Saito, Ryo Kikuchi, and Takenori Atsumi, ``Optimization Method for Controller Parameters Using Support Vector Machine'', The 20th IEEE International Conference on Industrial Technology, pp. 157-162, (2019-2)

43. Yoshiyuki Otsuji and Takenori Atsumi, ``Estimation of Wind Disturbance for Quadcopter in Closed Space'', The 20th IEEE International Conference on Industrial Technology, pp. 102-107, (2019-2)

44. Takenori Atsumi, ``Sampled-Data Positioning Control Techniques for HDDs'', The 4th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2018), IS1-1, (2018-3)

45. Jun Ito and Takenori Atsumi, ``Controller Design Method for Dual-Stage-Actuator System of HDDs by using RBode Plot'', The 4th IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization (SAMCON 2018), TT6-3, (2018-3)

46. Takenori Atsumi, ``Coordinated system with tracking-position and flying-height controls for magnetic heads in HDDs'', The 19th IEEE International Conference on Industrial Technology, pp. 117-122, (2018-2)

47. Jun Ito and Takenori Atsumi, ``Improvement of H-infinity Controller by Using RBode Plot for Magnetic-Head Positioning System in HDDs'', The 19th IEEE International Conference on Industrial Technology, pp. 205-210, (2018-2)

48. Takenori Atsumi, Analysis of Sampled-data Open-loop Characteristics on Magnetic-Head Positioning System in HDDs'', The 20th World Congress of the International Federation of Automatic Control, pp. 7888-7893, (2017-7)

49. Takenori Atsumi, “Relationship between flying-height and tracking-position control with thermal actuators for magnetic heads in HDDs”, The 7th IFAC Symposium on Mechatronic Systems, pp. 26-31, 2016

50. Takenori Atsumi, “Analysis of Unobservable Oscillation in Repeatable Run-Out for Head-Positioning System of Hard Disk Drive”, The 2016 American Control Conference, pp. 5328-5333, 2016

51. Takenori Atsumi, “Estimation Method of Unobservable Oscillations in Sampled-Data Positioning Systems”, The 2nd IEEJ International Workshop on Sensing, Actuation, Motion Control, and Optimization, IS5-1, 2016

52. Shota Yabui and Takenori Atsumi, “A Design Method of Initial Value for Adaptive Feed-forward Control using Support Vector Machine”, The 41st Annual Conference of the IEEE Industrial Electronics Society, pp. 4283-4288, 2015

53. Shota Yabui and Takenori Atsumi, “IMPROVEMENT OF CONVERGENCE FOR ADAPTIVE FEED-FORWARD CONTROL BY INITIAL VALUE SETTING IN HARD DISK DRIVES”, 2015 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment, MoD-1-3, 2015

54. Shota Yabui, Takenori Atsumi, and Shigeo Nakamura, “Compensation for Mechanical Resonances Variation with Magnetic Head Position in Positioning Control System of HDDs”, The 1st IEEJ International Workshop on Sensing, Actuation, and Motion Control, IS7-3, 2015, (Invited)

55. Shota Yabui, Atushi Okuyama, Takenori Atsumi, “A Study of Equivalence Between AFC and Feedback Control with Resonant Filter”, SICE Annual Conference 2013, pp. 2138-2143, 2013

56. Takenori Atsumi, Shigeo Nakamura, Masaru Furukawa, Irizo Naniwa, Junguo Xu, “Triple-Stage-Actuator System of Head-Positioning Control in Hard Disk Drives”, The Asia-Pacific Magnetic Recording Conference 2012, CB-1, 2012, (Invited)

57. Masaki Odai, Takenori Atsumi, Haruaki Ohtsuki, Toshihiro Arisaka, “Head-Positioning Control System Using Thermal Actuator in Hard Disk Drives”, The 2012 ASME-ISPS / JSME-IIP Joint International Conference on Micromechatronics for Information and Precision Equipment, pp. 364-366, 2012

58. Shota Yabui, Atushi Okuyama, Takenori Atsumi, Masaki Odai, “Development of Optimized Adaptive Feed-forward Cancellation with Damping for Head Positioning System in Hard Disk Drives”, The 2012 ASME-ISPS / JSME-IIP Joint International Conference on Micromechatronics for Information and Precision Equipment, pp. 352-354, 2012

59. Takenori Atsumi, William C. Messner, “Suppression of Residual Vibrations around the Sampling Frequency”, The 37th Annual Conference of the IEEE Industrial Electronics Society, pp. 3317-3322, 2011

60. Shota Yabui, Masahito Kobayashi, Atushi Okuyama, Takenori Atsumi, “Development of Optimized Adaptive Feed-Forward Cancellation for Head Positioning Control System in Hard Disk Drives”, The 21st Annual ASME Conference on Information Storage and Processing Systems, pp. 99-101, 2011

61. Takenori Atsumi, William C. Messner, “Unobservable Settling Vibration on Head-Positioning Control in Hard Disk Drives”, The 18th World Congress of the International Federation of Automatic Control, pp. 4052-4060, 2011

62. Takenori Atsumi, William C. Messner, “Analysis of Residual Vibrations above the Nyquist Frequency in Head-Positioning Control of Hard Disk Drives”, The 5th IFAC Symposium on Mechatronic Systems, pp. 76-83, 2010

63. Takenori Atsumi, William C. Messner, “Modified Bode Plots for Head-Positioning Control in Hard Disk Drives with Structured and Unstructured Uncertainties”, The 5th IFAC Symposium on Mechatronic Systems, pp. 63-70, 2010

64. Takenori Atsumi, William C. Messner, “Mixed Sensitivity Problem in Sampled-Data Positioning Control Systems”, The 10th The International Conference on Motion and Vibration Control, 1B25, 2010

65. Takenori Atsumi, William C. Messner, “Estimation of Unobservable Oscillations in Sampled-Data Positioning Systems”, The IEEE International Symposium on Industrial Electronics, pp. 1852-1857, 2010

66. Takenori Atsumi, William C. Messner, “Loop-Shaping Controller Design with the RBode Plot for Hard Disk Drives”, The 2010 American Control Conference, pp. 2659-2664, 2010

67. Takenori Atsumi, William C. Messner, “Optimization of Head- Positioning Control in a Hard Disk Drive Using the RBode Plot”, The 11th IEEE International Workshop on Advanced Motion Control, pp. 542-547, 2010

68. Takenori Atsumi, “Disturbance Suppression beyond Nyquist Frequency in Hard Disk Drives”, The 17th World Congress The International Federation of Automatic Control, pp. 827-832, 2008

69. Takashi Yamaguchi, Takenori Atsumi, “HDD Servo Control Technologies - What we have done and where we should go - (Keynote)”, The 17th World Congress The International Federation of Automatic Control, pp. 821-826, 2008

70. Toshiya Shiramatsu, Takenori Atsumi, Masayuki Kurita, Yuki Shimizu, Hideaki Tanaka, “Dynamically Controlled Thermal Flying-Height Control Slider”, The IEEE International Magnetics Conference 2008, pp. 1440-1441, 2008

71. Takenori Atsumi, “Shock-Response-Spectrum Analysis of Sampled-Data Polynomial for Track-Seeking Control in Hard Disk Drives”, The 10th IEEE International Workshop on Advanced Motion Control, pp. 240-247, 2008

72. Takenori Atsumi, Atsushi Okuyama, Masahito Kobayashi, “Track- following Control Using Resonant Filter in Hard Disk Drives”, The 2007 American Control Conference, pp. 61-67, 2007

73. Takenori Atsumi, Atsushi Okuyama, Masahito Kobayashi, “Vibration Suppression Beyond Nyquist Frequency in Hard Disk Drives”, The 2006 IEEE International Conference on Control Applications, pp. 1109-1114, 2006

74. Takenori Atsumi, “Feedforward Control Using Sampled-data Polynomial in Hard Disk Drives”, The 8th International Conference on Motion and Vibration Control, pp. 72-77, 2006

75. Takenori Atsumi, Atsushi Okuyama, Shinsuke Nakagawa, “Vibration Control Above The Nyquist Frequency in Hard Disk Drives”, The 9th IEEE International Workshop on Advanced Motion Control, pp. 103-108, 2006

76. Takenori Atsumi, “Head-Positioning Control Using Digital Resonant Modes in Hard Disk Drives”, The 7th International Conference on Motion and Vibration Control, 37, 2004

77. Toshihiro Arisaka, Toshihiko Shimizu, Takenori Atsumi, Hiromitsu Masuda, Takashi Yamaguchi, “Development on In-Phase Actuator Mechanism in Hard Disk Drives”, The Asia-Pacific Magnetic Recording Conference 2004, HA05-01, 2004 (Invited)

78. Takenori Atsumi, Toshihiro Arisaka, Toshihiko Shimizu, Hiromitsu Masuda, “Head-Positioning Control Using Resonant Modes in Hard Disk Drives”, The 8th IEEE International Workshop on Advanced Motion Control, pp. 311-316, 2004

79. Toshihiro Arisaka, Toshihiko Shimizu, Hiromitsu Masuda, Takenori Atsumi, Gentaro Nakamura, “Development of a Head Actuator Based on the New Design Concept for the Wide Servo Bandwidth in a Hard Disk Drives”, The 2003 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment, pp. 187-188, 2003

80. Takenori Atsumi, Toshihiro Arisaka, Toshihiko Shimizu, Takashi Yamaguchi, “Vibration Servo Control Design for Actuator's Mechanical Resonant Modes in Hard Disk Drives”, The 6th International Conference on Motion and Vibration Control, vol. 1, pp. 312-319, 2002

81. Masahito Kobayashi, Shinsuke Nakagawa, Takenori Atsumi, Takashi Yamaguchi, “High-Bandwidth Servo Control Design for Magnetic Disk Drives”, The 2001 IEEE/ASME International Conference on Advanced Intelligent Mechatronics, pp. 1124-1129, 2001

82. Mitsuo Hirata, Takenori Atsumi, Kenzo Nonami, “High Performance Digital Servo Design for HDD by using Sampled-Data H∞ Control Theory”, The 6th IEEE International Workshop on Advanced Motion Control, pp. 86-91, 2000

83. Mitsuo Hirata, Akiyo Murase, Takenori Atsumi, Kenzo Nonami, “A Design Method of TDOF Controller for Sampled-Data Control System －A Method Using Dynamical Model of Feedback Controller－”, The International Symposium on Motion and Vibration Control, pp. 17-24, 1999

84. Mitsuo Hirata, Takenori Atsumi, Akiyo Murase, Kenzo Nonami, “Following Control of a Hard Disk Drive by Using Sampled-Data H∞ Control”, The 1999 IEEE International Conference on Control Applications, pp. 182-186, 1999

Patents

1. Kouki Uefune，Takenori Atsumi, Hajime Eguchi, Shigenori Takada, “Hard Disk Drive Actuator Assembly with Interleaved Voice Coil Motor”, Patent No. US 9093094 B2, 2015

2. Takenori Atsumi, Irizo Naniwa, Toshiya Shiramatsu, Masayuki Kurita, “Hard-disk drive including fly-height-adjustment heating element and position-adjustment heating element and method of controlling fly height”, Patent No. US 8593749 B2, 2013

3. Chikako Sakagami, Kazuhisa Shishida, Isao Yoneda, Kazuaki Usui, Hiroshi Uchida, Takeshi Saito, Kenji Tomida, Takenori Atsumi, “Disk drive and method for head servo control of the disk drive”, Patent No. US 8059356 B2, 2011

4. Takenori Atsumi, Atsushi Okuyama, “Magnetic disk drive with positioning control system”, Patent No. US 7576943 B2, 2009

5. Takenori Atsumi, Atsushi Okuyama, Shinsuke Nakagawa, “Magnetic disk drive with positioning control”, Patent No. US 7474494 B2, 2009

6. Takenori Atsumi, Atsushi Okuyama, “Magnetic disk drive with positioning accuracy”, Patent No. US 7394609 B2, 2008

7. Takenori Atsumi, “Magnetic disk drive with feedback control”, Patent No. US 7161761 B2, 2007

8. Takenori Atsumi, Hidehiko Numasato, Jiro Abe, “Magnetic disk apparatus”, Patent No. US 6961205 B2, 2005

9. Takenori Atsumi, “Magnetic Disk Apparatus”, Patent No. US 6927934 B2, 2005

10. Toshihiko Shimizu, Tetsuya Hamaguchi, Toshihiro Arisaka, Hiromitsu Masuda, Gentaro Nakamura, Takenori Atsumi, “Carriage arm assembly for locating magnetic head, and magnetic disk apparatus using the same”，Patent No. US 6879467 B2, 2005

11. Takenori Atsumi, Masahito Kobayashi, Shinsuke Nakagawa, “Positioning control apparatus”, Patent No. US 6819522 B2, 2004

Review Paper

1. Takenori Atsumi, “Emerging Technology for Head-Positioning System in HDDs'', IEEJ Journal of Industry Applications, Vol. 5, No. 2, pp. 117-122, 2016 

2. Takenori Atsumi, “Head-Positioning Control of Hard Disk Drives Through the Integrated Design of Mechanical and Control Systems”, International Journal of Automation Technology, vol. 3, no. 3, pp. 277-285, 2009

3. Takashi Yamaguchi, Takenori Atsumi, “Design Method of a Full Closed Loop Sampled Servo Control for Hard Disk Drive”, The SICE Journal of Control, Measurement, and System Integration, vol. 1, no. 3, pp. 242-250, 2008

Workshop

1. William C. Messner, Takenori Atsumi, “Loop Shaping in the 21st Century”, The 2016 American Control Conference, pp. 22, 2016

2. William C. Messner, Takenori Atsumi, “Loop Shaping in the 21st Century”, The 2011 American Control Conference, pp. 22, 2011