KANG, CHONG YUN 2024-01-12T10:09:26Z 2024-01-12T10:09:26Z 2022-01-14 2001-01-01 https://pubs.kist.re.kr/handle/201004/84279 Dynamic Characteristics of Ring-type Piezoelectric Ultrasonic Motor Conference 1 , pp.115 - 117 115 117 Proceedings of the International Sensor Conference