A Harvesting Circuit for Flexible Thin-Film Piezoelectric Generator Achieving 562% Energy Extraction Improvement With Load Screening. - Muhammad Bilawal Khan; Dong Hyun Kim; Jae Hyun Han; Hassan Saif; Hyeonji Lee; Yongmin Lee; Minsun Kim; Eunsang Jang; Daniel Juhyung Joe; Keon Jae Lee; Yoonmyung Lee (IEEE Trans. Ind. Electron., 2021)