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과체중 및 비만 환자에서 좌심실 기능의 조기 변화: 티슈 도플러 심초음파를 이용한 분석
유승기,최재웅,조용범 대한심장학회 2008 Korean Circulation Journal Vol.38 No.5
Background and Objectives: Obesity is a cause of cardiac dysfunction. We analyzed the change of diastolic function with the increase of the body mass index (BMI) for the early detection of cardiac dysfunction in overweight and obese patients. To analyze the diastolic function, we measured the mitral valve early and late diastolic inflow velocities with performing Doppler studies (E, A) and the early and late mitral annulus velocities with performing tissue Doppler studies (E’, A’). Subjects and Methods: From January 2005 to October 2007, 2,684 cases were enrolled in this study. The patients had a normal cardiac size, normal systolic function, no regional wall motion abnormalities and no significant valve disease. Those patients with a history of congenital heart disease, renal failure and congestive heart failure were excluded. The BMI was checked and Doppler echocardiographic analysis, including tissue Doppler, was done. Results: The left ventricle (LV) mass index (normal: 89.1±19.1, overweight: 95.7±18.4, obese: 97.2±18.9 g/m2, p<0.01), and the E/E’ (8.84±2.81, 10.02±3.03, 10.84±3.66, respectively, p<0.01) were higher, and the E (72.4±16.7, 68.6±16.0, 71.5±17.0 cm/sec, respectively, p<0.01), and E’ (8.78±2.77, 7.27±2.19, 7.17±2.62 cm/sec, respectively, p<0.01) were lower in the overweight (BMI≥25 kg/m2) and obese groups (BMI≥30 kg/m2) than that of the normal group. On multiple logistic regression analysis, overweight was an independent risk factor for diastolic dysfunction with considering other risk factors such as hypertension, diabetes mellitus, age and gender. The risk of LV diastolic dysfunction was increased 2.13 times in the overweight group and 3.1 times in the obese group as compared with the normal group. Conclusion: With an increase of weight, diastolic function was worsened before the development of systolic dysfunction. This change was apparent in the overweight group. Tissue Doppler study on the mitral annulus is more sensitive to detect the change of diastolic function in overweight and obese patients. Background and Objectives: Obesity is a cause of cardiac dysfunction. We analyzed the change of diastolic function with the increase of the body mass index (BMI) for the early detection of cardiac dysfunction in overweight and obese patients. To analyze the diastolic function, we measured the mitral valve early and late diastolic inflow velocities with performing Doppler studies (E, A) and the early and late mitral annulus velocities with performing tissue Doppler studies (E’, A’). Subjects and Methods: From January 2005 to October 2007, 2,684 cases were enrolled in this study. The patients had a normal cardiac size, normal systolic function, no regional wall motion abnormalities and no significant valve disease. Those patients with a history of congenital heart disease, renal failure and congestive heart failure were excluded. The BMI was checked and Doppler echocardiographic analysis, including tissue Doppler, was done. Results: The left ventricle (LV) mass index (normal: 89.1±19.1, overweight: 95.7±18.4, obese: 97.2±18.9 g/m2, p<0.01), and the E/E’ (8.84±2.81, 10.02±3.03, 10.84±3.66, respectively, p<0.01) were higher, and the E (72.4±16.7, 68.6±16.0, 71.5±17.0 cm/sec, respectively, p<0.01), and E’ (8.78±2.77, 7.27±2.19, 7.17±2.62 cm/sec, respectively, p<0.01) were lower in the overweight (BMI≥25 kg/m2) and obese groups (BMI≥30 kg/m2) than that of the normal group. On multiple logistic regression analysis, overweight was an independent risk factor for diastolic dysfunction with considering other risk factors such as hypertension, diabetes mellitus, age and gender. The risk of LV diastolic dysfunction was increased 2.13 times in the overweight group and 3.1 times in the obese group as compared with the normal group. Conclusion: With an increase of weight, diastolic function was worsened before the development of systolic dysfunction. This change was apparent in the overweight group. Tissue Doppler study on the mitral annulus is more sensitive to detect the change of diastolic function in overweight and obese patients.
모바일 디스플레이용 유리 기판의 미 식각부 두께 최소화를 위한 습식식각 공정조건 최적화
유승기,김재경,전의식 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.2
The expansion of the display market could mass-produce the product which becomes the super-slim and ultra-lighting according to the demand of customer. This change etched the mobile display panel in order to make the thin glass. The wet etching refers to the process of removing selectively the unnecessary part in order to form the circuit pattern among the semi-conductor or the LCD manufacturing process. The wet etching can progress the etching about a large amount at a time but the thickness of glass is not smooth or not etched according to the process condition. In this study, the defect factor in the etching process tries to be analyze. The experimental design was established and the processing condition was optimized in order to minimize under non-etch part generation by the experiment of design.
유승기,김선효,최지웅,강돈혁,정동민,You, Seung-Ki,Kim, Sunhyo,Choi, Jee Woong,Kang, Donhyug,Jeong, Dongmin 한국음향학회 2014 韓國音響學會誌 Vol.33 No.3
능동소나에 의한 표적 반향 신호는 다중경로 환경에서 전파됨에 따라 신호가 변형되어 수신된다. 또한 표적의 위치와 자세각에 따라 반향 신호 특성이 다르게 나타난다. 따라서 이러한 특성을 반영할 수 있는 3차원 형상의 표적 모델을 통해 반향 특성이 모의 되어야 한다. 본 논문에서는 3차원 표적신호의 모의를 위해 표적의 각 구성부를 형상 함수화 하였으며 각 구성부의 대표 반향점을 등간격으로 선정하여 표적 모델을 개발하였다. 개발된 표적 모델을 이용하여 음의 입사각에 따른 반향 신호와 표적강도(TS : Target Strength)를 모의하였다. 모의된 표적신호의 반향 강도 및 신호 특성을 검증하기 위해 조립이 가능한 구성부별 축소 모형을 제작하여 수조에서 축소 표적을 이용한 반향 실험을 수행하였다. When a active sonar signal is transmitted and returned back from a target, it has been distorted by various properties of acoustic channel such as multipath arrivals. And signals have been appeared to be different form by target position and attitude. Therefore, we simulated the target echo signal using 3 dimensional target model include reflects target features. In this paper, we develop components form of a simulated target model is made up equally spaced highlight points, and each part of the target consists of shape function. We can simulate a target echo signal and Target strength (TS) according to wave incident angle. To verify, we made small scale target in kit form and we had got underwater target signal for comparing simulation result in water tank.