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문정환,이상준,정필상,Moon, Jeong Hwan,Lee, Sang Joon,Chung, Phil-Sang 대한후두음성언어의학회 2013 대한후두음성언어의학회지 Vol.24 No.1
Laser laryngeal microsurgery is currently the primary method of treatment of various laryngeal diseases. The development of laryngeal microsurgery came from the introduction of a small spot $CO_2$ laser micromanipulator and more precise microlaryngeal instruments. $CO_2$ laser laryngeal microsurgery has enabled very precise surgery because it has small focus size and hemostatic effect. There are some limitations to the use of the $CO_2$ Laser such as adjacent tissue damage and vocal fold scarring. These problems can be minimized through understanding the mechanisms by which lasers function and correctly manipulating the parameters under a surgeon's control. We should also recognize the safety of $CO_2$ laser for the surgeon to precisely perform the procedure.
이상준(Sang Joon Lee),정필상(Phil-Sang Chung),문정환(Jeong Hwan Moon),이기일(Ki-Il Lee) 대한두경부종양학회 2006 대한두경부 종양학회지 Vol.22 No.2
Intrathoracic goiters can be classified anterior and posterior mediastinal goiter with its locations. Most intrathoracic goiters are retrosternally situated in the anterior mediastinal compartment. Posterior mediastinal goiters are rare, but might present a difficult diagnostic and surgical problem. Although thyroid goiters are nearly always amenable to a cervical approach, posterior mediastinal goiters may require a combined cervico-thoracic approach with sternotomy or thoracothomy. We herein describe a case of posterior mediastinal goiter which was excised only by cervical approach. The relevant literature is briefly reviewed.
차량 외관 및 공력 개선을 위한 Dual Motion AAF 메커니즘 연구
이경암(Kyeong Am, Lee),변재섭(Jae Sup, Byun),김명기(Myeong Ki, Kim),최재섭(Jae Seob, Choi),김준형(June Hyung, Kim),정필중(Phil Jung, Jeong) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
AAF(Active Air Flap) is located in the front of the vehicle and has the advantage of improving fuel efficiency by controlling the inflow of air required for engine cooling. In addition, the application rate of AAF is expanding due to recent environmental regulations and electrification of vehicles. In particular, to improve the aerodynamic performance of electric vehicles, the cooling area is reduced and moving designs are being tried to diversify the exterior design of the vehicle. In this study, we proposed a new AAF operation mechanism to realize various designs of vehicles and secure aerodynamic performance. Through this, an operating mechanism was implemented that maintains the operability of the existing AAF and improves the aerodynamics improvement effect.
변재섭(Jae Sup Byun),이경암(Kyung Arm Lee),최재섭(Jae Seob Choi),정필중(Phil Jung Jeong) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
AAF(Active Air Flap) is located in the front of the vehicle and has the advantage of improving fuel efficiency by controlling the inflow of air required for engine cooling. In addition, the application rate of AAF is expanding due to recent environmental regulations and electrification of vehicles. In particular, to improve the aerodynamic performance of electric vehicles, the cooling area is reduced and moving designs are being tried to diversify the exterior design of the vehicle. In this study, we proposed a new AAF operation mechanism to realize various designs of vehicles and secure aerodynamic performance. To this end, the existing AAF operation performance was maintained and a new mechanism design such as sequential operation and grill gap-flush structure was performed.
작물 배양용 램프 개발을 위한 인버터의 열 해석에 관한 연구
윤정필(Jeong-Phil Yoon),강병복(Byung-Bog Kang),박세준(Se-Jun Park),이기제(Gi-Je Lee),차인수(In-Su Cha) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.11
BT에 대한 관심이 높아지면서 식물 종자 및 작물의 배양 기술에 관한 연구가 활발해 지고 있다. 이 연구들은 주로 백신, 종자 등에 대해 연구가 이루어지고 있는데, 이를 위해 다양한 연구 환경의 구축이 필요한 시점이다. 본 논문에서는 여러가지 본야 중에서도 빛의 파장대에 따른 작물의 배양 조건 분류를 위한 특수램프 개발에 주 목적을 두고 인버터 최적조건 설계를 위하여 Ansys S/W를 사용, 램프 전원용 인버터의 열 분포를 시뮬레이션 하였다.
전동/발전기 코어에 의한 초전도 플라이휠 에너지 저장장치의 회전손실 특성 평가
李丁必(Jeong-Phil Lee),韓塋熙(Young-Hee Han),丁世庸(Se-Yong Jung),韓相哲(Sang-Chul Han),鄭年縞(Nyeon-Ho Jeong),成台鉉(Tae-Hyun Sung) 대한전기학회 2007 전기학회논문지 Vol.56 No.10
In this paper, the rotational loss of the superconductor flywheel energy storage system (SFES) by motor/generator stator core was assessed. To do this, the vertical axial type SFES with journal type superconductor bearing was manufactured. To quantitatively assess the rotational loss by the stator core, the rotational losses by superconductor bearing and the degree of a vacuum were measured. In case of variation of the inner radius and outer radius of the stator core, the rotational losses were measured. From the experimental results, It is confirmed that the rotational loss can be reduced by means of the optimal stator core design.
이정필(Jeong-Phil Lee),한상철(Sang-Chul Han),박병철(Byeong-Cheol Park),한영희(Young-Hee Han),박병준(Byung-Jun Park),정세용(Se-Yong Jung) 대한전기학회 2009 전기학회논문지 Vol.58 No.9
In this paper, 5 ㎾h class Superconductor Flywheel Energy Storage System (SFES) was constructed including motor/generator, superconductor magnetic bearing(SMB), composite rotor and electromagnetic damper(EMD) system. High speed rotation test was performed after levitating flywheel rotor only using EMD without SMB. the PD controller of EMD was designed. the control system is constructed using xPC which is real time digital control system. the results of high speed rotation test showed that proposed EMD system have sufficient damping in cylindrical mode and conical mode, and vibration of wheel was suppressed below 10 ㎛.