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RISS 인기검색어
- 검색키워드
- 저자 : 이현우(Hyun Woo Le) (검색결과 2 건)
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Development of Feed forward Control Algorithm for Active Pneumatic Engine Mount System
아르잔 터닙(Arjon Turnip),응우네 래 호아(Le Hoa Nguyen),박성훈(Seonghun Park),최재용(Jae-Yong Choi),이현우(Woo-Hyun Lee),김정훈(Jeong-Hoon Kim),홍금식(Keum-Shik Hong) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The attenuation of engine vibration transmitted to the chassis has been the major concern of the automotive community in order to increase the comfort of driver and passengers. An active pneumatic engine mount (APEM) system presented in this paper reduces the transmission of engine vibration to the chassis and the noises in the passenger cabin, besides supporting the static load by an engine weight. To accomplish this goal, a feed forward control algorithm with an adaptive normalized filtered-X LMS method was employed in the currently developed APEM system. This proposed algorithm reduces the response time of control signal and improves the inherent delayed control output in the feedback algorithm by calculating reference signals obtained from vibration sources. Based on the modeling of APEM system, the simulation result confirms how well the proposed control algorithm in this paper performs to reduce the transmitted vibrations from engine to the chassis.
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급성 심근경색증 발생 위험인자와 경색관련동맥의 협착정도와의 연관성
김영진(Young Jin Kim),이태일(Tae Il Lee),이재련(Jae Lyun Lee),조인호(In Ho Cho),신동구(Dong Gu Shin),김영조(Young Jo Kim),심봉섭(Bong Seop Sim),이현우(Hyun Woo Le) 대한내과학회 1995 대한내과학회지 Vol.49 No.5
N/A Objectives: The most common cause of myocardial infarction is atherosclerotic lesion of epicardial coronary artery. But coronary blood flow can also be dampered by the arterial emboli, spasm. and this may result in myocardial infarction. To investigate the risk factors of myocardial infarction with normal coronary artery, a study was conducted. Methods: This study was made on 122patients, admitted at Yeungnam University Hospital as their first attack for acute myocardial infarction, from August 1992 to May 1994. The patients undertook angiography with thrombolytic therapy at the earliest possible time. These patients were classified into four groups: group 1-patients with less than 25% stenosis of infarct related artery(IRA); group 2-between 25-50% stenosis of IRA; group 3-between 51-75% stenosis of IRA; group 4-between 76-99% stenosis of IRA. Results: Among 122patients with myocardial infarction, the mean age was 55.4years old and the ratio of male to female was 3.5:1. Group 1patients had a significantly lower mean age(44.6years) than group 3patients(55.8years) and group 4patients (59.1years). Of fifteen patients in group 1, 12 patients developed acute myocardial infarction under 50years of age. In frequency of risk factors of coronary heart disease, 84 of 122cases(68.9%) were smokers. The number of smokers was higher in group 1 (86.7%) than group 3 (58.6%) and group 4 (64%). The frequency of angina prior to myocardial infarction was lower in group 1 (7%) than group 3 (45%) and group 4 (46%). The frequency of multivessel disease was lower in group 1 (13%) than group 3 (31%) and group 4 (50%). There was no significant difference in the frequency of the hypertension, diabetes, dyslipidemia, and obesity among the groups. Conclusion: Acute myocardial infarction with near normal infarct related artery developed at young age compared with those with significant infarct related artery stenosis. The number of smokers was higher and the frequency of previous angina history was lower in the same group.
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