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햅틱 인터페이스 제어와 성능 평가를 위한 가상환경 설정
우기영,권동수 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.2
This paper deals with control and performance evaluation of a two degree-of-freedom(dof) five-bar haptic interface driven by harmonic DC servomotors. The presented haptic display has nonlinear effects such as friction and motor cogging which affect impedance fidelity. Force feedback control strategies including a feed forward friction compensator based on joint torque and a disturbance observer have been proposed and are evaluated through experiments. The first set of experiments was conducted to measure how well the impedance fidelity could be achieved for various control strategies. The second set of experiments was conducted to investigate the influence of the control strategies on discontinuity perception and to measure the upper limit of the haptic simulation range of the haptic display.
정종찬,우기영,조현수,조용훈,조남성,양성윤,문재현 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.96 No.-
Angular electroluminescence spectra stabilized and efficiency enhanced top-emitting organic lightemittingdevices (TOLEDs) were demonstrated using randomly distributed mesoscopic internal wrinkles. Compared to planar TOLEDs, wrinkled TOLEDs showed a faster exciton decay rate in the emissive layerand high rate of radiative recombination, which leads to enhanced efficiency. Our wrinkled TOLEDsshowed angular spectral dependency (u0v0(u)) of 0.0032, which is low enough to be imperceptible to thehuman eyes, and 38.7 % enhanced external quantum efficiency relative to the planar counterpart. Theapproach described here provides an effective scheme for improving TOLEDs and obviating the necessityof modifying the stack structure of the device.