5. Kyung wook Heo and Jee-Hoon Jung, “Power Control Method of Wireless Power Transfer in Foldable Mobile Phone for Charging and Power Balancing of Dual-side Batteries”, KR10-2019-0091574, Ulsan National Institute of Science and Technology, 29 July. 2019

7. Hwa-Pyeong Park and Jee-Hoon Jung, “Wearable system device with battery power control method and power control method according to user demand”, KR10-2019-0023153, Ulsan National Institute of Science and Technology, 27 Feb. 2019