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후방십자인대 내에 발생한 관절내 결절종 - 1례 보고 -
정재헌,백지훈,이상학,정호중,하용찬,Jeong, Jae-Heon,Baek, Ji-Hoon,Lee, Sang-Hak,Jung, Ho-Joong,Ha, Yong-Chan 대한정형외과스포츠의학회 2010 대한정형외과스포츠의학회지 Vol.9 No.1
슬관절내 결절종은 무증상에서 부터 동통, 운동장애 등의 다양한 형태의 증상으로 나타나며, 자기공명영상이 진단적 도구로 이용된 후 진단율이 높아지고 있으나, 여전히 드문 질환이다. 특히 후방십자인대 주위의 결절종은 십자인대 후방과 후방 관절막 사이에 위치하는 것이 대부분이며, 후방십자인대 내부에 위치한 예는 아직 보고된 바가 없다. 본 예는 간헐적 동통 및 굴곡 구축을 주소로 내원한 12세 환아에서 자기공명영상 검사에서 후방십자인대 내의 결절종으로 진단되어 후격막 통과 도달법으로 후방십자인대를 분열하여 낭종 제거 후 2년 추시 관찰에서 우수한 결과를 얻었기에 보고하고자 한다. Ganglionic cyst formation within the posterior cruciate ligament (PCL) of knee has not been reported. We describe a case of an intraligamentous ganglionic cyst of PCL. Arthroscopic technique through both the posteromedial and posterolateral portals was used for approach. Using probe, PCL was splitted and perforated ganglionic cyst at tibial attachement side. At 2 years follow up, the patient was free of symptoms with a full range of motion and follow-up MR image showed that there was no recurred ganglionic cyst.
YCl<sub>3</sub>-MgCl<sub>2</sub> 혼합 용융염 중 용융 Mg에 의한 Off-grade Ti 스크랩의 탈산
정재헌,이소영,박성훈,손호상,Jung, Jae-Heon,Lee, So-Yeong,Park, Sung-Hun,Sohn, Ho-Sang 한국자원리싸이클링학회 2021 資源 리싸이클링 Vol.30 No.2
Off-grade Ti generated from smelting and mechanical processing has a high oxygen content. In this work, off-grade Ti was deoxidized using Mg and a chloride mixture as the reductant and flux, respectively. The experiments were conducted in the α-Ti temperature range (1,023~1,123 K) and the effects of the reaction time, reaction temperature, quantitiy of Mg and chloride ratio on deoxidation were investigated. Notably, when YCl3 is used as the flux to react with MgO, it is possible to reduce the activity of MgO. Therefore Ti can be deoxidized using Mg. In this study, the O content was decreased from 0.5 wt% to 0.1004 wt% at 1073 K, for 6 hours, with Mg=3.6 g and $X_{YCl_3}=0.22$.
지상파 DMB와 GPS 모듈이 내장된 시스템에서의 GPS 수신감도 개선
정재헌(Jae-Hun Jung),정기현(Kihyun chung) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
Recently developed Mobile Device have several RF functions. In this paper, the snesitivity in GPS of mobile devices including GPS & terrestrial DMB is studied. And a technique is proposed to increase the GPS sensitivity while minimizing the interference around ground plane.
마이크로그리드 시험을 위한 전압 위상 변동 기능을 가지는 전력품질외란 발생기
정재헌(Jae-Hun Jung),노의철(Eui-Cheol Nho) 대한전기학회 2015 전기학회논문지 P Vol.64 No.3
This paper describes a power quality disturbance generator for the test of a microgrid. The generator provides phase-angle jump as well as voltage sag with simple structure. The main components of the generator are SCR thyristors and transformers, therefore, high reliability and high efficiency can be obtained without switching losses. The operating principle of the proposed scheme is described and the voltage and current characteristics in case of voltage sag with phase-angle jump is analyzed. The usefulness of the proposed topology is verified through simulations and experimental results.
3상 인터리브드 양방향 DC-DC 컨버터의 경부하 동작 시 전류 리플 최소화를 위한 스위칭 기법
정재헌(Jae-Hun Jung),노의철(Eui-Cheol Nho) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.8
This paper deals with a switching method to minimize the current ripple component of 3-phase interleaved bidirectional DC-DC converter for charging and discharging of the battery. The characteristics of the output current ripple in 3-phase and 2-phase operation modes according to the variation of battery voltage is analyzed and a phase conversion method for minimizing the magnitude of the current ripple is proposed. The proposed method can extend the light load range because the switching frequency is lower than that of a 3-phase operating system. Simulation and experimental results show the usefulness of the proposed method.