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이종홍(J. H. Lee),서희원(H. W. Seo),송진원(J. W. Song),한창수(C. S. Han) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
A single-wall carbon nanotube (SWCNT) has been studied as a material of Nano-Eletro-Mechanical-System (NEMS) device together with various nanowires. In order for oscillation of a multi-wall carbon nanotube (MWCNT) or a singlewalled carbon nanotube (SWCNT) on plane surface, it needs suspension of a CNT across trench electrodes. So we propose fabrication method of a MWCNT resonator using dielectrophoresis and show successful results of suspeneded MWNT. Thin electrodes with large gaps could not suspend small diameter MWNT but thicker electrodes could. Thin MWNT could be suspended only when the electrode gap was reduced.
다목적함수 최적설계기법에 의한 자동차 현가장치 부품 개선에 대한 연구
이종홍(jonghong Lee),한상훈(Sanghoon Han),소현준(Hyunjun Soh),유정훈(JeonghoonYoo) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
In the design of a suspension system of an automobile, system vibration and structural rigidity must be considered.<br/> In this paper we consider the weight reduction and the increase of the first eigen-frequency of a suspension part,<br/> especially on the upper control arm, using size optimization. To satisfy both the weight reduction and the increase of<br/> the first eigen-value, the multi-criteria optimization method for robust design is applied. The design variables are<br/> fluctuating during the optimization process by the multi-criteria optimization method. Therefore, we have<br/> determined the robust values of the design variables not only to satisfy the terms of fluctuation limits but also to<br/> optimize the two design parameters at the same time.
이종홍(jonghong Lee),유정훈(Jeonghoon Yoo) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Vehicle suspension systems are parts which effect performances of a vehicle such as ride quality, handling characteristics, straight performance and steering effort, etc. Moreover, through the finite element analysis by<br/> the computer, the accuracy of initial design steps becomes higher than that of the former days. In the design of a suspension system, system vibration and structural rigidity must be considered simultaneously. so far. In this paper we consider the weight reduction and the increase of the first eigen-frequency of a suspension part, especially on the upper control arm, using topology optimization and size optimization. Firstly, we obtained the initial design by using the topology optimization. And then, we applied the multi-objective optimization method to satisfy both the weight reduction and the increase of the first eigen-frequency. The design variables are fluctuating during the optimization process by the multi-objective optimization method. Therefore, we determined the robust values of the design variables not only to satisfy the terms of fluctuation limits but also to optimize the two design parameters at the same time.<br/> <br/>