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슈퍼 커패시터를 사용한 MHEV용 5㎾급 저압 인버터 시스템 개발
남호준(Ho-Jun Nam),김준석(Joohn-Sheok Kim),최동수(Dong-Soo Choi),윤준철(Jun-Cheol Yoon),이석희(Seok-Hee Lee) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
고유가 시대의 도래와 화석연료의 소비를 줄일 수 있는 환경 친화적 자동차인 하이브리드 자동차의 도입이 일본, 미국 등을 중심으로 꾸준히 증가하고 있다. 이 중 마일드 하이브리드 시스템은 Idle Stop-Start , Launch Assist 및 회생 제동 등의 기능을 적용하여 연비개선의 효과를 갖고 있다. 본 논문에서는 기존 화석 연료를 사용하는 자동차에도 적용이 가능하며 2차 전지에 비해 수명이 긴 슈퍼 커패시터를 사용하여 MHEV용 5㎾급 저압 인버터 시스템을 개발하였다.
Methotrexate로 치료한 타카야수 동맥염에 동반된 괴저성 농피증
김종근 ( Jong Keun Kim ),서준혁 ( Jun Hyuk Seo ),윤준철 ( Jun Cheol Yoon ),박도회 ( Do Hwae Park ),조민재 ( Min Jae Jo ),이찬우 ( Chan Woo Lee ),백애란 ( Ae Lan Paik ),민복기 ( Pok Kee Min ),나건연 ( Gun Yoen Na ),오동호 ( Dong Ho 대한류마티스학회 2006 대한류마티스학회지 Vol.13 No.1
Pyoderma gangrenosum (PG) is a vasculitic process, often associated with systemic diseases, including Takayasu`s arteritis (TA), rheumatoid arthritis, and inflammatory bowel disease. Most cases of PG associated with TA have been observed in Japan. However, this association is not commonly observed in North American and European patients. PG is often refractory to therapy, requiring high dosages of glucocorticoids. Here, we describe a case of recalcitrant PG that was associated with TA and successfully treated with methotrexate.
이원재 ( Won Jae Lee ),조현수 ( Hyun Su Jo ),손장원 ( Jang Won Son ),윤준철 ( Jun Cheol Yoon ),손창우 ( Chang Woo Son ),박규환 ( Kyu Hwan Park ),이상희 ( Sang Hee Lee ),홍그루 ( Geu Ru Hong ),박종선 ( Jong Sun Park ),신동구 ( Dong 대한내과학회 2010 대한내과학회지 Vol.79 No.3
Background/Aims: In Korea, few studies have examined primary cardiac tumors, which have a reported incidence of 0.0017~0.19% in autopsy series. This study surveyed the status of primary cardiac tumors over the past 7 years in one region. Methods: A retrospective review examined all patients with primary cardiac tumors, except for confirmed thrombus, using hospital medical records from 2000 to 2006 at six community hospitals. Identified cases undergoing biopsy and surgery were selected for the study. Results: The operative mortality was 7.7%. Of the 71 patients (26 males) with identified primary cardiac tumors, 65 (91.5%) tumors were benign and 6 (8.5%) were malignant. The benign tumors were myxoma (78.9%), rhabdomyoma (4.2%), fibroelastoma (2.8%), fibroma (1.4%), and leiomyoma (1.4%). Two of the myxomas were present at multiple locations. The malignant tumors included sarcomas (67%) and lymphomas (33%). Most of the tumors were located in the left atrium (76%). The majority of patients presented with chest pain and dyspnea. During follow-up for an average of 26.8±21.3 months, all but one patient with benign tumors was alive; one myxoma patient died perioperatively (1.5%). Four of the patients with malignant tumors (67%) died. Conclusions: Cardiac myxomas and sarcomas were the most common primary benign and malignant tumors, respectively. Benign tumors had excellent postoperative survival rates, while malignant tumors had high mortality. (Korean J Med 79:271-276, 2010)
임성택 ( Seung Taek Lim ),오동호 ( Dong Ho Oh ),이상우 ( Sang Woo Lee ),김종근 ( Jong Keun Kim ),김영호 ( Young Ho Kim ),서준혁 ( Jun Hyuk Seo ),윤준철 ( Jun Cheol Yoon ),이찬우 ( Chan Woo Lee ),이태우 ( Tae Woo Lee ) 대한류마티스학회 2005 대한류마티스학회지 Vol.12 No.2
Juvenile onset ankylosing spondylitis is a chronic inflammatory arthritis showing oligoarthritis and enthesopathy of the peripheral and axial skeleton. This have been shown to have different clinical presentation and outcome from adult onset ankylosing spondylitis. Takayasu arteritis is a uncommon, chronic inflammatory disease of elastic arteries such as the aorta, its larger branches and the pulmonary artery trunk. Although, it has rare report about association between ankylosing spondylitis and Takayasu arteritis, there was no report of juvenile onset ankylosing spondylitis with Takayasu arteritis. Thereby, we report a patient with Takayasu arteritis who had juvenile onset ankylosing spondylitis in the course of his disease.
3.0T MR system에서 TOF-MRA의 유체속도와 신호소실의 정량분석 : 유속조절팬텀 이용
백상훈(Sang-Hoon Back),정진헌(Jin-Heon Jeong),이예은(Ye-Eun Lee),곽민영(Min-Young Gwak),윤준(Jun Yoon),정다빈(Dabin Jung),오현식(Hyun-Sik Oh),허영철(Yeong-Cheol Heo) 한국방사선학회 2020 한국방사선학회 논문지 Vol.14 No.7
본 연구의 목적은 TOF-MRA에서 유체속도의 변화와 신호소실의 상관성을 정량적으로 분석하고자 하였다. 유체속도를 제어할 수 있는 팬텀을 자체 제작하여 유체속도를 8.0 ~ 127.3 mc/s까지 총 16단계로 변화시켰다. 3.0T MRI장치를 이용하여 TOF-MRA검사를 하였고 신호소실의 길이와 영상을 유입부, 중간부, 유출부로 분류하여 각 신호강도를 측정하였다. 신호소실의 길이는 유체속도가 127.3 cm/s였을 때 가장 길게 측정되었고 신호강도는 유체속도가 증가할수록 감소하였다(p<0.05). 유입부(-.547)와 중간부(-.643)는 유체의 속도가 증가할수록 음의 상관성이 있었다(p<0.05). 결론적으로 유체속도의 증가는 TOF-MRA에서 신호소실을 야기하는 주요한 인자였음을 확인하였다. 추후 혈류속도가 빠른 모델에서 신호소실을 줄이는 시퀀스 및 파라메터를 연구할 때 본 연구가 기초자료를 제공할 것이라 사료된다. The purpose of this study was to quantitatively correlate the change of flow velocity and signal voiding in TOF-MRA. We made our phantom to control the flow velocity, and changed the flow velocity in 16 steps from 8.0 to 127.3 mc/s. The TOF-MRA test was performed using a 3.0T MRI system and the signal intensity was measured by classifying the signal voiding length and image into the In flow, Mid flow, and Out flow. The length of signal voiding was the longest when the flow velocity was 127.3 cm/s and the signal intensity decreased with increasing flow velocity(p<0.05). In flow(-.547) and Mid flow(-.643) were negatively correlated with flow velocitys(p<0.05). In conclusion, it was confirmed that the increase in flow velocity was a major factor causing signal voiding in TOF-MRA. In the future, this study will provide basic data when studying sequences and parameters to reduce signal voiding in models with a high flow velocity.