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Hae Yeon Park is a rising authority in the control and stability of robotic systems, with a primary focus on biped walking robots and uncertain Euler-Lagrange dynamics. Her most impactful contribution is a novel stability framework for trajectory tracking in bipedal locomotion, published in 2022, which has already garnered 30 citations. This work redefines the dynamic relationship between the center of mass and the zero moment point within the linear inverted pendulum model, offering a rigorous, norm-based stability criterion that advances the safety and reliability of humanoid walking. Park further extends this line of inquiry with a 2024 study on robust balancing control under external forces, providing a controller synthesis method that guarantees admissible force bounds. Beyond bipedal systems, she has made significant strides in model-free control for uncertain Euler-Lagrange equations, introducing a Lyapunov-based $ L_\infty $-gain performance measure (2023, 9 citations), and has developed new $ H_{\infty} $ robust stability and performance conditions for uncertain robot manipulators (2025, 8 citations). Her work bridges theoretical rigor and practical control design, establishing her as a key contributor to the next generation of robust, adaptive robotic systems.