Researcher Database

（Last updated : 2025-04-08 12:37:34）　

TOKUDA Isao

Department / Course College of Science and Engineering Department of Mechanical Engineering

Title / Position Professor

Click to view the Scopus page. The data was downloaded from Scopus API on Apr 21, 2025. via http://api.elsevier.com and http://www.scopus.com .

Other Affiliations
1.	Graduate School of Science and Engineering

Research activities
1.		The Institute of Electronics, Information and Communication Engineers (IEICE)
2.		Acoustical Society of Japan
3.		THE JAPAN SOCIETY OF LOGOPEDICS AND PHONIATRICS
4.		Japanese Neural Network Society

Subject of research
1.	Mathematical modeling of circadian rhythm and its applications
2.	Modeling of voice production and its application to singing and bioacoustics
3.	Nonlinear time series analysis

Research summary
Elucidation of rhythm mechanism in life systems and its engineering application Stable and regular repeating timewise patterns are called rhythms. Phenomena accompanied by rhythms can be widely seen in nature, centered on human beings and life systems. For example, vocalizing rhythms, music performance rhythms, walking rhythm, beating of the heart, 24 hour cycle of living activities, light emission of fireflies, sparking of nerve system neurons, astronomical movements, etc., the list is endless. When these rhythmic bodies gather together, further rich cooperation will be born. In mechanical engineering, the development of oscillators with stable rhythm and accurate clock is important infrastructure technology. In our laboratory, mathematical models and experimental systems are structured for these rhythm phenomena occurring in nature, and the understanding is deepened by simulation, etc., targeted at creating further advanced mechanical engineering systems with the knowledge obtained. Research and development is conducted especially for sound systems, cerebral nerve systems, circadian rhythms, music, and mechanical systems as the main subjects.

Present specialized field
Life / Health / Medical informatics, Intelligent mechanics/ Mechanical systems (Keyword：Nonlinear dynamics, Synchronization, Time series analysis, Voice production, Coupled oscillators)

Books
1.	2024/12/14	The Vocal Membranes May Explain Why Humans are So Talkative │ 2,pp.1-2
2.	2021/11/29	Source-filter theory of speech
3.	2021/10/01	Nonlinear Analysis and Control of Quasi-passive Dynamic Walker Based on Entrainment Effect │ 18,pp.514-530
4.	2017	Nonlinear Dynamics and Temporal Analysis │ ,pp.336-357

Papers
1.	2025/01/10	Tensegrity-based legged robot generates passive walking, skipping, and crawling gaits in accordance with environment │ IEEE/ASME Transactions on Mechatronics │
2.	2024/11/20	Recovering detailed shape of phase response curves from the higher harmonics of singularity response │ Phys. Rev. Research │ 6,pp.043174
3.	2024/09	Embodying rather than Encoding: Towards Developing a Source-filter Theory for Undulation Gait Generation │ Biomimetic Intelligence and Robotics │ 4 (3),pp.100173
4.	2024/07/02	Frequency-modulated timer regulates torpor-arousal cycles during hibernation in distinct small mammalian hibernators │ npj Biological Timing and Sleep │ 1 (3)
5.	2024/06/28	Estimating Kolmogorov-Sinai entropy from time series of high-dimensional complex systems │ Physics Letters A │ 510,pp.129531
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Academic conference presentation
1.	2021/05/30	Generation of Efficient Rectilinear Gait Based on Dynamic Morphological Computation and Its Theoretical Analysis
2.	2021/05/30	Synergetic Effect between Limbs and Spine Dynamics in Quadruped Walking Robots
3.	2020/10/26	Energy-Efficient Locomotion Generation and Theoretical Analysis of a Quasi-passive Dynamic Walker
4.	2020/06/01	Optimal fast entrainment waveform for indirectly controlled limit cycle walker against external disturbances
5.	2019/11/21	A novel worm-like locomotion robot slides on slippery ground with asymmetric inner oscillation
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Grants-in-Aid for Scientific Research -KAKENHI-
1.	2020/04 ～ 2024/03	Plant growth instability originated from disturbance of circadian rhythm and optimization of nonparametric cultivation environment │ Grant-in-Aid for Scientific Research(A)
2.	2019/04 ～ 2024/03	Experimental studies of the phonation in non-human primates for elucidating the speech evolution │ Grant-in-Aid for Scientific Research(A)
3.	2019/04 ～ 2022/03	Object Carrying and Dynamic Manipulation Systems Applied with Locomotion Control Techniques of Underactuated Robots │ Grant-in-Aid for Scientific Research(C)
4.	2016/04 ～ 2019/03	Mathematical model for circadian control of estrus cycles and its implication to infertility treatment │ Grant-in-Aid for Scientific Research(C)
5.	2016/04 ～ 2019/03	Creation of Novel Functions for Locomotion Robots Based on Optimal Fusion of Sliding Effect and Body Shape │ Grant-in-Aid for Scientific Research(C)
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researchmap Researcher code
5000016698