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불안정형 관동맥질환 환자에서 주요 심혈관 사건의 예측 인자로서의 심근 Troponin 1 및 Myoglobin 에 관한 연구
허재웅(Jae Woong Hur),김경현(Kyung Hyun Kim),하영준(Young Jun Ha),박찬수(Chan Su Park),서우종(Woo Jong Seo),조영재(Yeong Jae Cho),차경우(Keung Woo Cha),남시현(Si Hyun Nam),김종연(Jong Yeon Kim) 대한내과학회 2001 대한내과학회지 Vol.61 No.5
N/A Background: Patients with unstable angina or non Q wave myocardial infarction still have an elevated risk for subsequent cardiac events. Therefore early assessment of the risk of future cardiac events is important. In this study, prognostic value of troponin I and myoglobin was evaluated and compared with other known early available risk indicators. Methods: Serum troponin I and myoglobin were measured at presentation and 8 hours, 16 hours, and 24 hours thereafter in 126 patients with unstable angina (n=70) or non Q myocardial infarction (n=56) from Jan 1998, through Feb 2000. Echocardiography was performed with calculation of wall motion score index. The incidence of cardiac death or myocardial infarction was compared between patients with normal troponin I, myoglobin and abnormal ones, respectively. Results: (1) At 6 months, 1 death (2.2%) and 1 myocardial infarction (2.2%) occurred in the 45 unstable angina patient s with normal troponin I compared with 3 deaths (12.0%) and 8 myocardial infarctions (32.0%) in the 25 unstable angina patient s with elevated troponin I. (2) At 6 months, 1 death (1.7%) and 3 myocardial infarctions (5.2%) occurred in the 58 unstable angina patients with normal myoglobin compared with 3 deaths (25.0%) and 6 myocardial infarctions (50.0%) in the 12 unstable angina patient s with elevated myoglobin. (3) When the analysis was limited to patients with normal baseline troponin I (≤0.4 ng/ dl: n=45), increased myoglobin level remained significantly associated with increased incidence of cardiac deaths or myocardial infarction compared with normal myoglobin level (16.7% vs 0%). (4) Together with age, diabetes, wall motion score index, troponin I and myoglobin levels were identified as independent prognostic variables for myocardial infarction or cardiac death in a multivariate logistic regression analysis. (5) The maximal troponin I and myoglobin value obtained during the first 24 hours provides independent and import ant prognostic information regardless of whether the patient is classified as having unstable angina or non Q wave myocardial infarction. Conclusion: The maximum troponin I and myoglobin obtained during the first 24 hours provides independent and important prognostic information in patients with unstable angina or non Q wave myocardial infarction. (Korean J Med 61:496- 505, 2001)
허재웅(Jaewoong Hur),이교일(Kyoil Lee),정규홍(Kyuhong Jung),김관수(Kwansoo Kim) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2
Nowadays, many of passenger cars use automatic transmission as power transmission control devices because of its convenience. So many intensive researches for automatic transmission of passenger cars has been performed. In case of construction vehicle, drivers must do many tasks during the construction operation such as working of boom, forward/backward driving, and shifting. So the amount of work done is dependent of driver's dexterity. Due to the this reason, the adoption of automatic transmission has increased in the construction vehicle. In this paper, the automatic transmission shift controller in construction vehicle is developed. The mathematical model of automatic transmission is established and the shifting simulation program is developed. The hardware and software for shift controller is designed and the performance of designed controller is verified by some experiments.
[동력전달계] 건설차량용 자동변속기 동력전달장치의 모델링 및 해석
박정렬(Jung Yul Park),허재웅(Jae Woong Hur),정규홍(Gyu Hong Jung),이교일(Kyo Il Lee),김관수(Kwan Soo Kim) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
In general. the transient torque takes place when the gear shifts in the vehicle equipped with automatic transmission. The modeling of the powertrain is necessary for design the control algorithm to decrease the transient torque. In this study, the modeling of powertrain dynamics for the construction vehicle is established and the velocity analysis is accomplished. Automatic transmission for this system is ALT(Automotive Layshaft Transmission) type and has many shafts and rotating members. So the velocity analysis is achieved by classitying all element into three rotating groups and dynamic modeling is accomplished with three equivalent inertia models that are always in gear with each other. And the transient shift model is obtained by using this equivalent inertia model and the kinematic constraints for each gear shift. Also, the torque and pressure of each element which is required when the gear shifts can be obtained by static characteristic analysis and the minimum line pressure in hydraulic system can be set up through this result.
한진오(J.O.Hahn),허재웅(J.W.Hur),한상서(S.S.Han),신병관(B.K.Shin),이교일(K.I.Lee) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
In this study. The analysis of the hydraulic control system for torque converter clutch was carried out. For the analysis of the relation between engine throttle and duty ratio of the pressure control solenoid valve. Detailed models for the related hydraulic valves were set up. And the steady-state analysis was performed based on the established model. A simplified transfer function model between the control input of torque converter clutch solenoid valve and the clutch pressure difference was also established. And the analysis result was validated by the experiment.<br/>