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김승택,김형태,이상호,김종석,Kim, Seung-Taek,Kim, Hyung-Tae,Lee, Sang-Ho,Kim, Jong-Seok 한국반도체디스플레이기술학회 2010 반도체디스플레이기술학회지 Vol.9 No.4
Charged micro-particles are widely used as the key components for many electrical applications such as an e-paper, a touch panel, a printer toner and an electronic ink. Among them, the e-paper is an emerging reflective type display using the charged particles that has the advantages of the extremely low power consumption and sunlight readability. To create images on the e-paper, we confine black positively-charged and white negatively-charged particles between bottom and top electrodes and selectively apply the electric field. When the Coulomb force by an applied electric field is greater than the adhesion force between the charged particle and the electrode, the particles' transition happens resulting in the change of color between black and white. Therefore, the adhesion force is a very important factor for designing and estimating e-paper's operation. In this study, we constructed a basic model for particle's transition and an adhesion force equation describing particle's transition with three different forces: electrostatic image force, Van der Waals force and gravitational force. The simulation results showed that the gravitational force is negligible for the interesting range for the charge and the radius, and the adhesion force can be strongly dependent on the particle's charge and radius.
진동 외란 완화를 위한 교차상관 기반 초기 신속 개략 정렬 알고리즘
김승택(Seung-Taek Kim),김용훈(Yong-Hun Kim),송진우(Jin-Woo Song) 제어로봇시스템학회 2021 제어·로봇·시스템학회 논문지 Vol.27 No.1
In this paper, we propose a rapid coarse alignment algorithm for mitigating vibratory disturbances, via employment of cross-correlation. The proposed algorithm analyzes the frequency of vibration disturbance due to the engine of a helicopter using a cross-correlation technique to cope with variable frequencies, and determines the initial alignment time by grasping the period. While the existing methods, such as maintaining a long initial alignment time or applying a filter, can passively remove vibration noise, the proposed method can actively cancel the vibration noise by adjusting the data acquisition time required for the initial alignment. Through this method, the sinusoidal time varying vibration can be actively canceled in a short time, making rapid initial alignment possible. The proposed algorithm was verified through Monte Carlo simulation for several situations.
김승택(Seung Taek Kim),김승목(Seung Mok Kim),박태희(Tae Hee Park),이정석(JungSeok Lee),이영제(YoungZe Lee) 한국트라이볼로지학회 2014 한국윤활학회지(윤활학회지) Vol.30 No.5
Multiple additives can help improve the performance of generally used lubricants. These additives include MoS₂, cadmium, chloride, indium, sulfide, and phosphide, which are harmful to both humans and the environment. Thus, researchers in this industry have been trying to reduce the use of these additives by finding alternatives. Nanodiamonds are one of these candidates. Nanodiamond particles are very hard, chemically stable, and highly heat-conductive. This research involved uniformly dispersing nanodiamond particles in marine engine oils via a matrix synthesis method at various concentrations (0, 0.1, 0.3, 0.5, and 1.0 wt). Friction and wear tests involved constant loads on ball-on-disk specimens, where the ball was AISI 51200 steel, the disk was AISI 1020 steel, and the sliding speed was 0.217 m/s. The lowest wear occurred at a suitable concentration of nanodiamonds (0.3 wt). However, excessive amounts of nanodiamonds caused them to act as abrasive debris because of their hardness, which increased the wear amount. The friction coefficient decreased as the nanodiamond concentration increased because their octagonal, almost spherical shape caused them to act as rolling contact elements between two surfaces.