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이세영,오차환,김필수,황의중 漢陽大學校 自然科學硏究所 1997 自然科學論文集 Vol.16 No.-
외부 광궤환 반도체 레이저의 출력 특성을 비율방정식의 수치해를 이용하여 분석하였다. 출력의 세기와 위상과 전자밀도를 시간에 대한 함수로 알아보았다. 또한 bifurcation diagram과 phase diagram을 통하여 궤환비율 k에 따른 레이저의 동작 특성을 조사하였다. 궤환광이 없을때는 이완발진이 감쇄한 후 안정한 출력특성이 나타나지만 되먹임 비율이 증가하면서 안정한 해의 갯수가 증가하다가 ??????이상의 매우 강한 광궤환에서는 출력특성이 극도로 불규칙해지고 무수히 많은 해를 갖는 혼돈현상이 나타남을 알 수 있었다. The output characteristics of a laser diode with external optical feedback were analyzed by numerical solutions of rate equations. The output power, phase and carrier density were plotted as a function of time. Dynamics of external cavity laser were investigated by the bifurcation diagram and the phase diagram with respect to the feedback rate k. If there was no feedback, relaxation oscillation reduced and laser showed stable output. For increasing feed back level, the number of stable state was increased. In very strong feedback rate above ??????, laser output showed extremely unstable and chaotic behavior.
윤여일,윤석기,김선규,김용현,남일송,차건영,황의원,김영선 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2
Background: The diabetic patients are at significantly increased risk of developing vascular disease. It's etiology may involve oxidative damage by free radiacals and protection againse such damage can be offered by antioxidants. We investigated that oxidative stress as assessed by measurement of total antioxidant status may play a role in development of diabetes mellitus. Method: We measured total antioxiant status using merchandised kit, glycated hemeglobin(HbA1c) in 46 type 2 diabetes mellitus patients and 50 healthy matched control subjects. Result: The total antioxidant status(TAS) was 2.10(±0.04) mmol/L in uncontrolled type 2 DM patients, 2.60(±0.03) in controlled type 2 DM patients and 2.70(±0.16) in healthy control subjects. TAS was significantly lower(P<0.05) in uncontrolled type 2 DM patients, but no significant association between in controlled type 2 DM patients and healthy control subjects. The TAS was 2.00(±0.17) mmol/L in complicated type 2 DM patients and 2.10(±0.29) uncomplicated type 2 DM patients. There was no significant associations between complicated type 2 DM patients and uncomplicated type 2 DM patients. Conclusion: Poor glycemic control is associated with reduced TAS in type 2 DM patients. TAS was thought indirect index that predict glycemic control of type 2 DM patients.
ORiginal Article : The Risk Factors for Bleeding of Fundal Varices in Patients with Liver Cirrhosis
( Eui Ju Park ),( Jae Young Jang ),( Ji Eun Lee ),( Soung Won Jeong ),( Sae Hwan Lee ),( Sang Gyune Kim ),( Sang Woo Cha ),( Young Seok Kim ),( Young Deok Cho ),( Joo Young Cho ),( Hong Soo Kim ),( Bo The Editorial Office of Gut and Liver 2013 Gut and Liver Vol.7 No.6
Background/Aims: The relationship between portal he-modynamics and fundal varices has not been well docu-mented. The purpose of this study was to understand the pathophysiology of fundal varices and to investigate bleeding risk factors related to the presence of spontaneous portosys-temic shunts, and to examine the hepatic venous pressure gradient (HVPG) between fundal varices and other varices. Methods: In total, 85 patients with cirrhosis who underwent HVPG and gastroscopic examination between July 2009 and March 2011 were included in this study. The interrelation-ship between HVPG and the types of varices or the presence of spontaneous portosystemic shunts was studied. Results: There was no significant difference in the HVPG between fundal varices (n=12) and esophageal varices and gastro-esophageal varices type 1 (GOV1) groups (n=73) (17.1±7.7 mm Hg vs 19.7±5.3 mm Hg). Additionally, there was no sig-nificant difference in the HVPG between varices with spon-taneous portosystemic shunts (n=28) and varices without these shunts (n=57) (18.3±5.8 mm Hg vs 17.0±8.1 mm Hg). Spontaneous portosystemic shunts increased in fundal vari-ces compared with esophageal varices and GOV1 (8/12 pa-tients [66.7%] vs 20/73 patients [27.4%]; p=0.016). Conclu-sions: Fundal varices had a high prevalence of spontaneous portosystemic shunts compared with other varices. However, the portal pressure in fundal varices was not different from the pressure in esophageal varices and GOV1. (Gut Liver 2013;7:704-711)
The Influence of Acyclic Nucleotide Analogues on Renal Function in Patients with Chronic Hepatitis B
Won Young Park,Jae Young Jang,Yong Hun Kim,Soung Won Jeong,Dong Joon Oh,Eui Ju Park,Sae Hwan Lee,Sang Gyune Kim,Sang-Woo Cha,Young Seok Kim,Young Deok Cho,Hong Soo Kim,Boo Sung Kim,Ji Sung Lee 한국간담췌외과학회 2014 한국간담췌외과학회 학술대회지 Vol.2014 No.4
차의영(Eui-Young Cha),허우형(Woo-Hyung Heo),구은진(Eun-Jin Goo) 한국컴퓨터정보학회 2013 한국컴퓨터정보학회 학술발표논문집 Vol.21 No.1
본 논문은 조명을 제거한 차영상을 이용하여 객체의 움직임을 탐지하는 시스템을 제안한다. 먼저, 입력받은 RGB영상을 Lab영상으로 변환하여 L채널 영상을 분리해낸다. 분리해낸 L채널 영상을 반전시켜 역 조명 영상을 만들어 원 영상과 합성한다. 그 후 만들어진 영상에 모폴로지 기법을 적용하고, 잡음 제거를 위해 크기 필터링을 사용한다. 그리고 배경 영상과 현재 영상의 차영상을 이용하여 객체의 움직임을 탐지한다. 실험 결과 제안된 시스템은 조명이 밝거나 어두워 영상 분석이 힘든 경우, 제대로 분석되지 않은 배경과 전경에 있어서 더욱 효과적으로 작동함을 증명한다.
갈색세포종이 유발한 심인성 쇼크의 체외순환 보조 요법에 의한 성공적 치료
이민영 ( Min Young Lee ),이상배 ( Sang Bae Lee ),차현서 ( Hyun Seo Cha ),유지홍 ( Ji Hong You ),최의영 ( Eui-young Choi ),박종숙 ( Jong Suk Park ) 영남대학교 의과대학 2017 Yeungnam University Journal of Medicine Vol.34 No.2
Pheochromocytoma can present with various symptoms including cardiogenic shock and cardiac arrest. Particularly, in cases of cardiogenic shock of unknown origin, pheochromocytoma should be considered. A 20-year-old woman without any medical history visited our emergency department due to nausea, vomiting, headache, and chest pain. Echocardiography revealed severe left ventricular dysfunction. Mechanical ventilation and veno-arterial extracorporeal membrane oxygenation (ECMO) were implemented owing to her unstable vital signs. For unstable vital sign and cardiogenic shock in a young woman without any previous medical history, pheochromocytoma was considered and diagnosed based on elevated levels of catecholamine derivatives in a 24-hour urine sample. Cardiac function recovered and ECMO was discontinued on the 5th day of hospitalization. She later underwent an elective adrenalectomy and no recurrence was found during the follow-up period. We reported a case of pheochromocytoma which was presented with cardiogenic shock in a young woman with no concomitant disease, and successfully treated with ECMO followed by an elective adrenalectomy.
개선된 허프 변환을 이용한 기울어진 자동차 번호판의 정형화 기법
정호영 ( Ho-young Jung ),김하영 ( Ha-young Kim ),윤희주 ( Hee-joo Yoon ),차의영 ( Eui-young Cha ) 한국정보처리학회 2004 한국정보처리학회 학술대회논문집 Vol.11 No.2
본 논문에서는 자동차 번호판 인식의 성공률을 높이기 위해 자동차 번호판을 정형화하는 방법을 제시한다. 번호판의 테두리 직선을 찾기 위해서 Hough 변환과 Mask 를 사용한 방법을 제시하고, 그 방법을 사용하여 다수의 기울어진 번호판 영상을 정확하게 정형화할 수 있었다. Hough 변환과 Mask 를 이용한 직선 검출 방법은 두꺼운 에지 성분이나 저해상도 영상의 경우에도 효과적으로 직선을 검출해냄을 알 수 있었다.