Prof. Maenghyo Cho Profile

Prof. Maenghyo Cho

at Seoul National Univ

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Publications (11)

Proceedings Article | 18 April 2022 Presentation

Unipolar-stroke, electroosmotic-pump carbon nanotube yarn muscles

Ray Baughman, Hetao Chu, Zhong Wang, Jiuke Mu, Na Li, Xiaoshuang Zhou, Shaoli Fang, Carter Haines, Jong Park, Si Qin, Ningyi Yuan, Jiang Xu, Sameh Tawfick, Hyungjun Kim, Patrick Conlin, Maenghyo Cho, Kyeongjae Cho, Jiyoung Oh, Steven Nielson, Kelvin Alberto, Joselito Razal, Javad Foroughi, Geoffrey Spinks, Seon Jeong Kim, Jianning Ding, Jinsong Leng

Proceedings Volume PC12042, PC120420E (2022) https://doi.org/10.1117/12.2612716

KEYWORDS: Carbon nanotubes, Ions, Graphene

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Proceedings Article | 25 March 2019 Presentation + Paper

Multiscale approach for modeling EUV patterning of chemically amplified resist

Hyungwoo Lee, Muyoung Kim, Junghwan Moon, Sungwoo Park, Byunghoon Lee, Changyoung Jeong, Maenghyo Cho

Proceedings Volume 10960, 1096008 (2019) https://doi.org/10.1117/12.2514840

KEYWORDS: Diffusion, Polymers, Chemical reactions, Extreme ultraviolet lithography, Line edge roughness, Extreme ultraviolet, Chemically amplified resists, Photoresist materials, Optical lithography

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Proceedings Article | 19 March 2018 Paper

Theoretical modeling of PEB procedure on EUV resist using FDM formulation

Muyoung Kim, Junghwan Moon, Joonmyung Choi, Byunghoon Lee, Changyoung Jeong, Heebom Kim, Maenghyo Cho

Proceedings Volume 10583, 1058323 (2018) https://doi.org/10.1117/12.2296494

KEYWORDS: Diffusion, Polymers, Chemical reactions, Extreme ultraviolet lithography, Photoresist materials, Line edge roughness, Electrons, Molecules, Finite difference methods

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Proceedings Article | 11 April 2017 Paper

Deformation characteristics of CFRP bi-stable composites according to negative initial curvature

Hyeok Lee, Jong-Gu Lee, Junghyun Ryu, Maenghyo Cho

Proceedings Volume 10165, 101651L (2017) https://doi.org/10.1117/12.2259909

KEYWORDS: Composites, Shape analysis, Analytical research, Aerospace engineering, Wind energy, Statistical analysis, Temperature metrology, Visualization, Bistability, Energy harvesting

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Proceedings Article | 11 April 2017 Paper

Self-folding structure using light-absorption of polystyrene sheet

Yonghee Lee, Maenghyo Cho

Proceedings Volume 10165, 101650L (2017) https://doi.org/10.1117/12.2259911

KEYWORDS: Composites, Absorption, Printing, Light sources and illumination, Thermography, Infrared radiation, Glasses, Manufacturing, Interfaces

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Proceedings Article | 24 March 2017 Paper

Computational approach on PEB process in EUV resist: multi-scale simulation

Muyoung Kim, Junghwan Moon, Joonmyung Choi, Byunghoon Lee, Changyoung Jeong, Heebom Kim, Maenghyo Cho

Proceedings Volume 10143, 101432E (2017) https://doi.org/10.1117/12.2266540

KEYWORDS: Extreme ultraviolet lithography, Computer simulations, Photoresist processing, Line edge roughness, Chemical reactions, Photoresist materials, Photochemistry, Semiconductors, Photoresist developing, Diffusion, Molecules, Electrons, Polymers, Monte Carlo methods

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Proceedings Article | 15 April 2011 Paper

Modified Brinson model as an equivalent one-dimensional constitutive equation of SMA spring

Junghyun Ryu, Sungmin Ahn, Je-sung Koh, Kyu-Jin Cho, Maenghyo Cho

Proceedings Volume 7981, 79813W (2011) https://doi.org/10.1117/12.881948

KEYWORDS: Shape memory alloys, 3D modeling, Numerical simulations, Actuators, Optical simulations, Metals, Sensors, Smart structures, Aerospace engineering, Current controlled current source

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Proceedings Article | 6 April 2006 Paper

Experimental test for numerical simulation of SMA characteristics and its simulation

Sanghaun Kim, Hyunho Choi, Manwon Yoon, Maenghyo Cho

Proceedings Volume 6170, 61700Z (2006) https://doi.org/10.1117/12.658915

KEYWORDS: Shape memory alloys, Actuators, Temperature metrology, Thermal effects, Protactinium, Numerical simulations, Manufacturing, Computer simulations, Power supplies, Smart structures

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Shape memory alloy (SMA) can exhibit interesting features such as the diverse material behaviors according to the induced temperature and stress. SMA changes its material properties progressively under cyclic loading conditions and finally reaches stable path(state) after a certain number of stress/temperature loading-unloading cycles, so called 'training' completion. The presence of permanent deformation, due to plastic strains or irreversible martensite variants during the material training, shifts the material characteristic curves of SMA wire. In this study, SMA wires that have been in a stable state through the training are used. Stress-strain curve of SMA wire at different temperature levels are measured. In addition, we observe other important effects such as the effect of mechanical/thermal training, rate effect according to thermal cycle times or strain rates, etc. Until now, the rate effect is not considered significantly in the SMA research and only extremely slow time rate is considered in most SMA experiments. It is common to use rate independent constitutive relations in the modeling and simulation of SMA behaviors. Therefore to make the actuators using an SMA wire which has the fast response or short-time thermal cycle environment, rate dependency should be properly considered. The result of two-way experiment at each (short or long) cycle time in phenomenological aspect shows that stress-strain-temperature relations and hysteresis characteristics depend upon the cycle time. In short-time cycle, strain-temperature curve moves in counterclockwise and the size of hysteresis envelop is large. As the time rate of the thermal cycle increases, the size of the hysteresis envelop is getting smaller and strain-temperature curve moves along the clockwise direction above a certain thermal cycle time. Above that thermal cycle time, hysteresis trajectory is fixed in the stable state. These new effects of SMA are investigated and the effect would be explained qualitatively. The present work presents the experimental test using 1-D SMA wire after training completion by mechanical/thermal cycling. Through these tests, we measure the characteristics of SMA. With the estimated SMA properties and effects, we compare the experimental results with the simulation results based on the SMA constitutive equation including the training and thermal rate effect.

Proceedings Article | 28 February 2005 Paper

Numerical simulation of double SMA wire actuator using two-way shape memory effect of SMA

Maenghyo Cho, Sanghaun Kim, Gun-In Kim

Proceedings Volume 5649, (2005) https://doi.org/10.1117/12.582270

KEYWORDS: Shape memory alloys, Actuators, Numerical simulations, Temperature metrology, Thermodynamics, Computer simulations, Numerical analysis, Smart structures, 3D modeling, Algorithm development

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Proceedings Article | 21 July 2004 Paper

Morphing of composite plate and beam actuated by SMA

Maenghyo Cho, Sanghaun Kim

Proceedings Volume 5387, (2004) https://doi.org/10.1117/12.539470

KEYWORDS: Shape memory alloys, Composites, Actuators, Computer simulations, Numerical simulations, Thermodynamics, Temperature metrology, Algorithm development, Numerical analysis, Smart structures

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Proceedings Article | 5 August 2003 Paper

Design of a novel composite cylinder reinforced with thin SMA layer

Sung-Hwan Lee, Cheol Kim, Maeng-hyo Cho

Proceedings Volume 5056, (2003) https://doi.org/10.1117/12.483456

KEYWORDS: Shape memory alloys, Composites, 3D modeling, Actuators, Control systems, Thermodynamics, Finite element methods, Numerical analysis, Smart materials, Mathematical modeling

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Showing 5 of 11 publications

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