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이충용(Choong-yong Lee),유정훈(Jeonghoon Yoo),송치오 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Topology optimization methods such as density method and homogenization method need designers to consider relationships between material and density of element, relaxation of design space, etc. In this paper, we proposed a modified topology optimization method to assist designers who do not have mathematical or theoretical backgrounds of the topology optimization. Topology optimization of structures can be achieved by the design of experiment and sensitivity analysis. Grouping elements in a design variable, the design variable has 0 for existence or 1 for absence. We conducted the design of experiments with an orthogonal array and sensitivity analysis of design variables to determine sensitive variables and insensitive variables used for connectivity between elements. This modified topology optimization method has advantages such as freedom from penalizing intermediate values and preventing checker-board problems frequently occur in the topology optimization process.
이충용(Choong-yong Lee),유정훈(Jeonghoon Yoo) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In the frame of topology optimization, the multi-objective ability has to be considered since structural design is usually required to satisfy more than one requirement. A modified topology optimization method is proposed to generate a structure of a swing arm type actuator satisfying maximum compliance and maximum stiffness at the same time by using the multi-objective optimization approach. The multi-objective function is defined to maximize the compliance in the direction of focusing as well as the eigen-frequency of the structure. We conducted the design of experiments and formulated response surface functions to construct the multi-objective function. The weighting factors between conflicting functions are determined by the back-error propagation neural network and the solution of multi-objective function is acquired by the genetic algorithm.
이충용(Choong-yong Lee),유정훈(Jeonghoon Yoo),송치오(송치오) 한국자동차공학회 2005 한국자동차공학회 Symposium Vol.- No.-
Topology optimization methods such as density method and homogenization method need designers to consider relationships between material and density of element, relaxation of design space, etc. In this paper, we proposed a modified topology optimization method to assist designers who do not have<br/> mathematical or theoretical backgrounds of the topology optimization. Topology optimization of structures can be achieved by the design of experiment and sensitivity analysis. Grouping elements in a design variable, the design variable has 0 for existence or 1 for absence. We conducted the design of experiments with an orthogonal array and sensitivity analysis of design variables to determine sensitive variables and insensitive variables used for connectivity between elements. This modified topology optimization method has advantages such as freedom from penalizing intermediate values and preventing checker-board problems frequently occur in the topology optimization process.
하이드라진을 이용한 용액환원법에 의한 Ni-GDC 미분말 합성과 전기적 특성
김선중,김강민,조평석,조윤호,이충용,박승영,강윤찬,이종흔,Kim, Sun-Jung,Kim, Kang-Min,Cho, Pyeong-Seok,Cho, Yoon-Ho,Lee, Choong-Yong,Park, Seung-Young,Kang, Yun-Chan,Lee, Jong-Heun 한국재료학회 2008 한국재료학회지 Vol.18 No.12
Ni-GDC (gadolinia-doped ceria) composite powders, the anode material for the application of solid oxide fuel cells, were prepared by a solution reduction method using hydrazine. The distribution of Ni particles in the composite powders was homogeneous. The Ni-GDC powders were sintered at $1400^{\circ}C$ for 2 h and then reduced at $800^{\circ}C$ for 24 h in 3% $H_2$. The percolation limit of Ni of the sintered composite was 20 vol%, which was significantly lower than these values in the literature (30-35 vol%). The marked decrease of percolation limit is attributed to the small size of the Ni particles and the high degree of dispersion. The hydrazine method suggests a facile chemical route to prepare well-dispersed Ni-GDC composite powders.
현명욱(Myung Wook Hyun),이충용(Choong-yong Lee),유정훈(Jeonghoon Yoo),강성철(Sungchul Kang),김승종(Seung-Jong Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Robots which interact with human should possess functionality and safety. Variable stiffness joint(VSJ) is attached to robot arm joint and controls joint stiffness to satisfy the safety condition when human is damaged by robot ann movement. This paper presents the design and experiment of initial electomagnet VSJ and the concept change to permanent magnet model. And this paper also explains about modifications to satisfy the design constraints. A prototype is manufactured and tested to verify the design and analysis results. The finite element method is used to electromagnetic analysis, and the virtual work method is used to calculate the electromagnetic force and torque.
초기재령 양생조건하의 콘크리트 비파괴시험과 압축강도의 영향 연구
김광돈 ( Kim Kwang Don ),김춘호 ( Kim Chun Ho ),이충용 ( Lee Choong Yong ),황민규 ( Hwang Min Kyu ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.2
Recently, concrete structures are constructed bigger and taller than before. There were many problems to control quality by Non Destructive Test in the early-age concrete. Therefore, by measuring the real-time data for the compressive strength and rebound number method and ultrasonic pulse velocity method from the concrete. NDT with curing temperature and by analyzing the data, we found structures were affected by hydration and curing temperature changes. From the real data, we can predict the concrete early-age strength, and contribute in quality control of the early-age concrete.
초기재령 양생조건하의 콘크리트 비파괴시험과 압축강도의 영향 연구
김광돈(Kim Kwang Don),김춘호(Kim Chun Ho),이충용(Lee Choong Yong),황민규(Hwang Min Kyu) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.2
Recently, concrete structures are constructed bigger and taller than before. There were many problems to control quality by Non Destructive Test in the early-age concrete. Therefore, by measuring the real-time data for the compressive strength and rebound number method and ultrasonic pulse velocity method from the concrete. NDT with curing temperature and by analyzing the data, we found structures were affected by hydration and curing temperature changes. From the real data, we can predict the concrete early-age strength, and contribute in quality control of the early-age concrete.