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About

In-Su Cha is a researcher specializing in intelligent control systems, fuzzy logic applications, and ultrasonic motor technology. His work focuses on enhancing the precision and adaptability of electromechanical systems, particularly for robotics and biomedical instrumentation. Cha’s major contributions include the design of a high-frequency resonant inverter for ultrasonic motor drives using fuzzy controllers, enabling improved speed and phase-difference control for robot joint elasticity and viscosity. He also developed a compensation method for temperature effects on ultrasonic motors used as robot actuators, addressing performance degradation in varying thermal conditions. Additionally, Cha designed a sinusoidal rotatory chair system employing an auto-tuning fuzzy PID controller to evaluate vestibular function, demonstrating the integration of advanced control strategies in medical diagnostics. Although his most-cited papers have modest citation counts (ranging from 2 to 4), they represent foundational work in applying fuzzy logic to precise motor control and actuator compensation. Cha’s research bridges control theory and practical mechatronic design, offering valuable insights for students and engineers working on intelligent actuation systems.