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About

Hiroyuki Ukai is a robotics and control systems researcher whose work bridges precision engineering and clinical rehabilitation. His career spans two distinct but complementary trajectories: foundational contributions to robust control theory and the practical development of therapeutic robotic systems. Ukai's early work established his credentials in control engineering, with his most-cited paper (41 citations) presenting a robust trajectory tracking strategy for multi-link elastic robot manipulators — addressing both structured nonlinear uncertainties and unstructured elasticity-related disturbances, a technically demanding challenge in robotic control. His research subsequently evolved toward rehabilitation robotics, where he has made sustained contributions developing assistive technologies for physical and occupational therapy. His laboratory produced innovative systems including a three-dimensional force display robot that facilitated direct collaboration with clinical therapists, a personalized upper-limb rehabilitation support robot, and a knee joint simulator capable of reproducing pathological conditions such as contracture, rigidity, and spasticity. The latter work carries direct educational value, serving as a training tool for student therapists. With multiple papers addressing stroke rehabilitation, drop foot, and quantitative evaluation of therapeutic outcomes, Ukai exemplifies a researcher committed to translating engineering expertise into meaningful clinical impact, accumulating over 110 citations across his documented output.