Dr. Youngtae Cho Profile

Dr. Youngtae Cho

at SAMSUNG Electro-Mechanics

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Author

Publications (2)

Proceedings Article | 21 February 2008 Paper

A novel diffractive micro-optical modulator for mobile display applications

Sang Kyeong Yun, JongHyeong Song, SeungDo An, InJae Yeo, YoonJoon Choi, YeongGyu Lee, HeungWoo Park, KyuBum Han, HaengSeok Yang, Victor Yurlov, Ihar Shyshkin, Anatoliy Lapchuk, HeeYeoun Kim, JaeWook Jang, JeHong Kyoung, JeongSuong Yang, SangKee Yoon, ChangSu Park, JongPil Cheong, YoungNam Hwang, KiSuk Woo, SeungWon Ryu, SeungWoo Lee, ChongMann Koh, YoungKi Baek, DaeHo Bae, HyunKee Lee, JaeHoon Lee, YungHo Ryu, HaeYeon Hwang, ChungMo Yang, OhkKun Lim, DongHyun Park, SeHwan An, JunHee Bae, SungMin Cho, BackSoon Go, SeokKee Hong, HoPhil Jung, SangJin Kim, KiUn Lee, JiHyun Park, JuHwan Yang, GiYoung Byun, SungHo Byun, YoungJin Cho, ChunGi Kim, JooHong Kim, SunKi Kim, SungIl Lee, WhaHyung Lee, KwanYoung Oh, SungKyung Oh, WooChul Shin, ByungKi Song, ElMostafa Bourim

Proceedings Volume 6887, 688702 (2008) https://doi.org/10.1117/12.762568

KEYWORDS: Glasses, Mirrors, Ferroelectric materials, Packaging, Metals, Laser based displays, Diffraction gratings, Modulation, Silicon, Diffraction

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Proceedings Article | 1 November 2007 Paper

Kinematic control model for light weighting mechanism of excavator attached to rotary working device

Choongho Lee, Sangsik Lee, Youngtae Cho, Kwanghee Im

Proceedings Volume 6423, 64232C (2007) https://doi.org/10.1117/12.779854

KEYWORDS: Analytical research, Agriculture, Kinematics, Instrument modeling, Smart materials, Control systems, Automatic control, Eye, Computer simulations, Eye models

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An excavator attached to a rotary working device is used principally in industrial work. In particular, they are used in the building industry and public works. This research concerns the rotary automatic control of an excavator attached to a rotary working device. The drilling excavator is used in the crushed stone industry and the dragline excavation system is employed in the construction industry. Cases of the excavator's use in agriculture have been the subject of a relatively few studies. However, several modified excavator designs have been released in recent years. Applied excavator products are primarily utilized under relatively severe environmental conditions. In this study, we focus on the uses of an excavator in agricultural work. The readjustment of arable land and the reduction of weeds in agricultural applications both require skilled hand-operation of the machines. As such workers have been shown to develop problems with regard to working posture and proper positioning while laboring, a more appropriate excavator design may prove useful in such applications. Therefore, this pilot study is focused primarily on the rotary automatic control of an excavator attached to a rotary working device, and will adapt smart materials to the excavator applications for developing redesigned excavator having a light weight. The excavator is attached to a rotary working device on a normal excavator's platform, and the position and orientation of the mechanism between the joints and the rotary working device was determined. Simulations were also conducted of the excavator attached to the rotary working device. With an eye toward the use of this mechanism in agricultural work, we also conducted a set of kinematic analyses. The rotary working device was assumed to have 3 DOF, and was comprised of 5 links. Computer simulations were also conducted using the developed excavator model. In order to adequately evaluate the possible performance of such a system, kinetic analysis, simulation with a soil model, FEM analysis with structural strength analysis, and changes to the smart materials with high rigidity will be required in the future. In addition, experiment and analysis of a prototype, durability experiments, and analyses utilizing S-N curves will be necessary, as well further research into the overall reliability of such a product.

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