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Shigenobu Muraoka is a pioneering researcher in the field of robotic tactile sensing, with a career-long focus on developing high-precision force sensors using quartz resonators. His major contribution lies in transforming the piezoelectric properties of quartz into robust, digital-output force sensors that overcome the limitations of traditional strain-gauge technologies. Muraoka’s seminal 1997 paper, "Force Sensor with Quartz Resonators by Differential Method" (12 citations), introduced a method to convert external force into frequency variations, enabling direct digital interfacing with microprocessors—a significant advance for noise-immune robotic systems. Building on this, his most-cited work, "Application of a Quartz Resonator to a Force Sensor Built in a Robot Finger" (2003, 14 citations), demonstrated the sensor’s integration into a robot finger for grasp and environmental recognition. Muraoka further extended this technology to measure mechanical impedance during grasping (2004, 3 citations) and to create three-component force sensors (1999, 2 citations). His artificial active antenna system (2004, 4 citations) showcases his commitment to environmental recognition. While his citation counts reflect a specialized niche, Muraoka’s innovations in quartz-resonator-based sensing have laid crucial groundwork for modern, digitally-native tactile sensors in robotics.