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비선형 유한요소 해석을 통한 자동차 시트용 Rubber Air Spring Damper의 슬리브 형태 변화에 따른 특성평가
김병수(Byeongsoo Kim),김청운(Chungwoon Kim),윤득선(Duksum Yun),Zhu xinhui 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Air springs are prevalently used as suspension in automobiles and it improves stability and comfort by enhancing the impact-relief, breaking, and cornering performance. Air spring can be classified into four kinds depending on their form and use; Convolution, Diaphragm, Rolling lobe, and Bellows. Among four types of suspension, this study focused on sleeve type of air spring since it has potential for ameliorating the quality of automobiles, specifically in its stability and comfort improvement. The sleeve type which consists of upper plate, lower plate, and rubber sleeve, can improve stability and comfort by decreasing the shock through rubber sleeve. This study used MARC, a nonlinear finite element analysis program, in order to find out maximum stress and maximum strain depending on reinforcement cord's angle variation in sleeves. The properties were found through uniaxial tension and pure shear test, and they were developed using Ogden·Foam which is an input program of MARC. The study shows internal maximum stresses and deformation according to the changes of cord angle, resulting the smaller the Young's modulus becomes, the more maximum stresses decrease.
비선형 유한요소법을 이용한 상용차량용 Air Spring의 보강코드 각도에 따른 응력과 변형률 특성 및 평가
정노진(Nojin Jeong),김청운(Chungwoon Kim),김병수(Byeongsoo Kim) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Air spring is the suspension, and it helps the improvement of stability and comfort by improving the impact-reliefㆍbrakingㆍcornering. The main composition of Air Spring is the upper plate, lower plate , and rubber sleeve. Rubber sleeve is the composite which is made up of combination of rubber and nylon, and the special quality is changed according to the shape of rubber-sleeve, the angle of reinforcement cord . This study performed to analyses the distribution of internal stresses and deformation for rubber composite material using non-linear finite element method. The study shows internal maximum stresses and deformation according to the changes of cord angle, resulting the smaller the Young's modulus becomes, the more maximum stresses decrease.
비선형 유한요소법을 이용한 Rubber Air Spring 복합소재의 보강코드 각도에 따른 응력과 변형률 특성 예측
정노진(Nojin Jeong),김청운(Chungwoon Kim),김병수(Byeongsoo Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.11
Air spring is the suspension, and it helps the improvement of stability and comfort by improving the impact-reliefㆍbrakingㆍcornering. The main composition of Air Spring is the upper plate, lower plate, and rubber sleeve. Rubber sleeve is the composite which is made up of combination of rubber and nylon, and the special quality is changed according to the shape of rubber-sleeve, the angle of reinforcement cord. This study performed to analyses the distribution of internal stresses and deformation for rubber composite material using non-linear finite element method. The study shows internal maximum stresses and deformation according to the changes of cord angle, resulting the smaller the Young's modulus becomes, the more maximum stresses decrease.
마이토마이신C를 병용한 아메드밸브삽입술에서 콜라겐 기질 삽입 여부에 따른 수술 성공률 비교
김용현(Yong Hyun Kim),김고은(Ko Eun Kim),김청운(Chungwoon Kim),안재홍(Jae Hong Ahn) 대한안과학회 2021 대한안과학회지 Vol.62 No.10
목적: 녹내장 환자에서 시행한 mitomycin-C (MMC)를 병용한 아메드밸브삽입술에서 콜라겐 기질 삽입 여부에 따른 수술 성공률을 비교해보고자 한다. 대상과 방법: 아메드밸브삽입술 시행 후 최소 1년 이상 관찰이 가능하였던 108명 108안을 대상으로 후향적 의무기록 분석을 통한 연구를 진행하였다. 콜라겐 기질을 삽입한 군은 55안, 대조군은 53안이었다. 안압하강제 사용 여부와 관계없이 안압이 연속하여 2회 이상 18 mmHg보다 높거나 5 mmHg보다 낮게 측정될 때를 수술 실패로 정의하였다. 결과: 콜라겐 기질 삽입군과 대조군 모두에서 술 전에 비하여 술 후 안압 및 안압하강제 개수가 유의하게 감소하였다(모두 p<0.001). 양 군 간의 술 후 안압 및 안압하강제 개수에는 차이가 없었다. Kaplan-Meier 생존분석 결과 녹내장수술 후 1년 누적 성공률은 콜라겐 기질 삽입군에서 78.2%, 대조군에서 79.2%였고, 양 군 간 유의한 차이는 없었다(p=0.54). 고안압기의 발생만이 수술 실패와 통계적으로 유의한 연관성을 보였다(hazard ratio=3.81, 95% confidence interval=1.72-8.41, p<0.001). 관을 전방에 삽입한 군이 섬모체고랑에 삽입한 군에 비하여 술 후 1년 뒤 의미 있는 시력저하를 보였으나(p=0.011), 시력저하와 관련된 위험인자 분석 시 두 군 간에 유의한 차이를 보이는 요인은 없었다. 결론: 녹내장 환자에서 시행한 MMC를 병용한 아메드밸브삽입술에서 콜라겐 기질 삽입 여부에 따른 1년간의 수술 성공률의 차이는 없는 것으로 보인다. Purpose: To compare the surgical outcomes of adjunctive mitomycin-C (MMC) Ahmed valve implantation with and without collagen matrix insertion. Methods: We retrospectively reviewed 108 eyes of 108 patients who underwent Ahmed valve implant surgery with adjunctive MMC. Collagen matrix insertion/Ahmed valve implant surgery (CM-AGV) was performed on 55 eyes, while conventional Ahmed valve implant surgery (AGV) was performed on 53 eyes. We defined surgical failure as an intraocular pressure (IOP) > 18 mmHg or <5 mmHg on two or more consecutive visits, regardless of medication status. Results: After surgery, the IOP and number of topical medications required fell significantly (compared with the preoperative period) in both groups (both p < 0.001); these findings did not significantly differ between groups. The cumulative surgical success rates at 1 year did not significantly differ between groups (78.2% vs. 79.2%, p = 0.54). The only risk factor significantly associated with surgical failure was a postoperative hypertensive phase. Anterior chamber (compared with sulcus) tube placement was significantly associated with visual acuity loss at 1 year postoperatively, but this did not significantly differ between groups. Conclusions: At the 1-year follow-up after Ahmed implant surgery with adjunctive MMC, the success rates of surgery with and without collagen matrix insertion were similar. J Korean Ophthalmol Soc 2021;62(10):1388-1396