Professional Experiences

January 2006-Present, Tokyo Institute of Technology, Tokyo, JAPAN
Associate Professor

• Department of Mechanical and Environmental Informatics

April 2004-December 2005, Japan Science and Technology Agency, Saitama, JAPAN
Research Fellow

• Performing research under CREST program.

January 2004-March 2004, Department of Aeronautics and Astronautics, Kyoto University, Kyoto, JAPAN
Post-Doctoral Fellow (COE)

• Conducted research under the 21st Century COE Program ``Center of Excellence for Research and Education on Complex Functional Mechanical Systems.''
  • Developed a novel neural network adaptive control algorithm that guarantees asymptotic stability of the plant states in stead of ultimate boundedness.

January 1999-December 2003, School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA, USA
Graduate Research Assistant

• Conducted research on direct adaptive control for nonlinear uncertain systems. Research sponsored under grants from the National Science Foundation under a Presidential Faculty Fellow Award (W. M. Haddad), the Air Force Office of Scientific Research, and the Army Research Office.
  • Developed a direct adaptive nonlinear control framework for adaptive stabilization, disturbance rejection, and command following of multivariable nonlinear uncertain dynamical systems with exogenous bounded amplitude disturbances and bounded energy $\mathrm{L}_2$ disturbances. The methodology was used to stabilize single-link manipulators and angular velocities of rigid-body spacecrafts in the face of unknown system inertias.
  • Developed direct adaptive controllers to suppress the effects of thermoacoustic combustion instabilities in combustion systems in the presence of system modeling errors.
  • Developed a direct adaptive control framework for a class of nonlinear matrix second-order systems with state-dependent uncertainty without requiring any parametrization or knowledge of the system uncertainty.
  • Developed a direct adaptive nonlinear tracking control framework for multivariable nonlinear uncertain systems with actuator amplitude and rate saturation constraints. The methodology was used to control the attitude of spacecrafts in the face of amplitude and rate saturation input constraints as well as unknown system inertias.
  • Developed a direct robust adaptive control framework for nonlinear uncertain systems with constant linearly parameterized uncertainty and nonlinear state-dependent uncertainty. This adaptive control framework captures the residual approximation error inherent in linear parameterizations of system uncertainty via basis functions.
  • Developed a direct adaptive nonlinear control framework for discrete-time multivariable nonlinear uncertain systems with exogenous bounded disturbances and bounded energy $\ell_2$ disturbances.
  • Developed a direct adaptive control framework for linear and nonlinear uncertain nonnegative and compartmental systems. The methodology was used to control the infusion of the anesthetic drug propofol for maintaining a desired constant level of depth of anesthesia for noncardiac surgery.
  • Developed a direct hybrid adaptive control framework for stabilization of nonlinear uncertain hybrid dynamical systems. Also developed a hybrid adaptive control framework that guarantees attraction of the plant states with weaker conditions.
  • Develop a neural adaptive control framework for adaptive set-point regulation of contin-uous-time and discrete-time nonlinear uncertain nonnegative and compartmental systems. The methodology was used to regulate chemical process temperatures for fixed-order exothermic irreversible reactions in continuously stirred-tank reactors.
  • Developed a direct adaptive control framework for a class of nonlinear matrix second-order systems with time-varying and sign-indefinite damping and stiffness operators.
  • Developed a passivity-based neural adaptive output feedback control framework for adaptive set-point regulation of nonlinear uncertain nonnegative and compartmental systems. The methodology was used to control pharmacokinetic/pharmacodynamic human response models with electroencephalogram (EEG) measurements.
• Supervised the installation and management of controller analysis and synthesis lab.
  • Responsibilities included recommendation for new computer hardware and software purchases, installation and supervision of newly installed facilities, data security, and networking.

June 1997-August 1997, Kernkraftwerk Leibstadt (KKL) AG, Leibstadt, SWITZERLAND
Visiting Student Engineer

• Developed and analyzed databases of nuclear fuel rod depletion in a nuclear power plant.

Tomohisa Hayakawa