Ms. Fusako Ishimura is an acoustic engineer and Kansei research specialist with more than 15 years of experience in the development of digital pianos and electronic keyboards. Her background spans mechanical design, acoustic system design, and perceptual/emotional evaluation, enabling her to bridge industrial product development and research. Since March 2025, she has been collaborating with National Taipei University of Technology on a project titled “Research on UI Improvements for Digital Piano and Electronic Keyboard Interfaces,” focusing on interaction design and user experience optimization, particularly control/operation design and usability. Since 2019, Ms. Ishimura has served as an Assistant Manager at Yamaha Corporation in Hamamatsu, Shizuoka, Japan, where she has been engaged in acoustic development and Kansei research. She has led acoustic development teams, overseeing end-to-end development and scheduling, as well as cross-departmental coordination. She has served as the acoustic development team leader for the following products: P-S500, CSP-295GP, ELA-1, and ELS-03. She has also conducted Kansei evaluation experiments to support product development decisions, established latency guidelines for digital piano performance based on perceptual thresholds, identified physical parameters related to spatial impression, and proposed the use of phase entropy to describe the temporal complexity of binaural phase differences.