“Design of a Nib-Sahped Ultrasonic Motor for Auto-focusing Camera”, Integrated Ferroelectrics, 141:50-57, 2013,
“Design of a Cross-Type Ultrasonic Rotary Motor with a Simple Structure”, Journal of the Korean Physical Society, Vol. 58, No. 3, pp. 594-598, March 2011
“Characteristics of the Piezoelectric Generator Using Circular Type Bender”, Ferroelectrics, 408:103?111, 2010
“Design of thin cross type ultrasonic motor”, J Electroceram, 09 April 2009
“Motional characteristics of thin piezoelectric rotary motor using cross shaped stator”, J Electroceram, 23:317?321, 2009
“A study on driving characteristics of the cross type ultrasonic rotary motor”, J Electroceram, 17:561?564, 2006