Der‐Cherng Liaw

National Yang Ming Chiao Tung University

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About

Der-Cherng Liaw is a distinguished researcher in nonlinear control systems and robotics, whose work bridges theoretical rigor with practical applications. His most impactful contribution is the development of a general invariance principle for nonlinear time-varying systems, published in 2001 and cited 43 times. This principle offers a powerful framework for analyzing system stability and convergence by constructing an intuitive criterion based on integral inequalities of output functions and modified detectability conditions—a significant advancement over classical invariance theorems. Liaw’s research also extends to robotics, where he pioneered the use of genetic learning algorithms for contact friction compensation, demonstrating how evolutionary computation can enhance robot control in real-world environments. His work has influenced fields ranging from autonomous systems to adaptive control, providing engineers and researchers with robust tools for tackling complex, time-varying dynamics. With a career marked by innovative problem-solving, Liaw continues to shape the intersection of control theory and intelligent systems, inspiring students and scholars to push the boundaries of nonlinear system analysis and robotic manipulation.