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Kohei Okita is a professor at the Department of Mechanical Engineering, College of Industrial Technology, Nihon University. He received his BScEng in 1996, his MScEng in 1998, and his DEng in 2002, all from Osaka University. From 2002 to 2006, he served as a postdoctoral fellow at the University of Tokyo. He joined the Functionality Simulation and Information Team of the VCAD System Research Program at RIKEN as a research scientist in 2006 and as a senior scientist from 2007 to 2011. While working at RIKEN, he also participated in the ISLiM project (Next-Generation Integrated Simulation of Living Matter) and developed the ZZ-HIFU-K (high-intensity focused ultrasound simulator for the K computer). He served as an associate professor at the Department of Mechanical Engineering, College of Industrial Technology, Nihon University from 2011 to 2022. Dr. Okita is a member of the American Physical Society, the Japan Society of Fluid Mechanics, and the Japan Society of Mechanical Engineers. His research interests include cavitating flow, acoustic cavitation, therapeutic ultrasound, and computational fluid dynamics.1) Numerical study on stress in a solid wall caused by the collapse of a cavitation bubble cloud in hydraulic fluid, International Journal of Multiphase Flow, 150, 103965, May 2022. https://doi.org/ 10.1016/j.ijmultiphaseflow.2021.1039652) Effects of breast structure on high-intensity focused ultrasound focal error, Journal of Therapeutic Ultrasound, 6(4), Jun 2018. https://doi.org/10.1186/s40349-018-0111-93) The role of numerical simulation for the development of an advanced HIFU system, Computational Mechanics 54, 1023–1033 Apr 2014. https://doi.org/10.1007/s00466-014-1036-y4) Microbubble behavior in an ultrasound field for high intensity focused ultrasound therapy enhancement, Journal of Acoustical Society of America, 134(2), 1576-85, Aug 2013. https://doi.org/ 10.1121/1.48128805) Development of High Intensity Focused Ultrasound Simulator for Large Scale Computing, International Journal for Numerical Methods in Fluids, 65, 43-66, Jan 2011. https://doi.org/10.1002/fld.2470Fig.1 HIFU simulation for brain tumorFig.2 Collapse of bubble cloud near wall－　　－4Research AchievementsKohei OKITAProfessor, Department of Mechanical Engineering