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이진 분류 기법을 이용한 레이저 촉감의 유효성 평가 연구
김형식,최미현,조지훈,전재훈,정순철 한국감성과학회 2019 춘계학술대회 Vol.2019 No.-
In this study, two types of pulsed laser energy were presented to the fingers and the change of cognitive response of the tactile sensation was observed. A Q-switched laser with an oscillation wavelength of 532 nm was used for the generation of the pulsed laser, and a neutral density filter was used for energy control. Experiments were conducted on 15 male college students. One experiment consisted of resting phase, stimulation phase, and response phase, and was performed 30 times for each subject. In the resting phase (25 seconds), the hands were kept in a relaxed state. In the stimulation phase (1 second), the laser was irradiated to the subject's finger, and in the response phase, the oral response was answered within 4 seconds. The subjects' responses after each laser irradiation were recorded in a contingency table. The items in the partition table consisted of 2-by-2 matrices with and without laser pulse presentations, and accumulated the number of responses at each table position. The specificity was analyzed and the calculated specificity was as high as 97.2%.
김형식,이관형 한국세라믹학회 2018 세라미스트 Vol.21 No.1
Display is an essence in human-machine communication interface. As mobile environment such as internet of things (IOT) and Artificial Intelligence (AI) progress, importance of display increases. Here we review research trend in flexible organic light emitting displays (OLEDs). This review article covers all the components consisting of flexible OELDs and shows direction of the recent research. This paper would be helpful for readers and researchers working in this field and provide perspective for future displays.
대응상태 원리를 응용한 열역학 특성치의 예측(1)압축계수
김형식,이준웅,이보성 한국화학공학회 1983 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.21 No.4
대응상태 원리를 응용하여 열역학 특성치를 예측할 수 있는 computer program을 개발하였으며 이로부터 methane-ethylene계, carbon dioxide-ethylene계에 대한 2성분계 보정계수를 최적화한 후 이를 사용하여 상기한 2계에 대한 압축계수를 예측한 결과 문헌치로부터 RMS편차가 각각 0.17∼1.23%, 0.61∼1.24%의 범위로 나타났다. A computer program, with which thermodynamic properties can be predicted, has been developed employing the principle of corresponding states theory. Two binary correction. parameters are optimized for methane∼ethylene and carbon dioxideethylene systems. Subsequently the compressibility factors are predicted for the above two systems with RMS deviations of approximately 0.17∼1.23% and 0.61∼1.24% range respectively.
마이크로가스터빈의 부하에 따른 상용 수소흡장냉동기의 성능 최적화에 관한 연구
김형식,손화승,최경식 대한설비공학회 2005 설비공학 논문집 Vol.17 No.9
MHR(Metal Hydride Refrigerator) powered by MGT exhaust gas is investigated to find out the optimum conditions corresponding to MGT operating powers. There are many factors to affect cooling capacity of MHR. In this study, the effect of switching time, flow rate of brine on cooling temperature and capacity is investigated. The present results show (1) hydrogen reaction is saturated with 25min switching time at 25kW MGT power, (2) cooling power shows maximum phenomenon with increasing switching time, (3) optimum switching times are 20 minutes for 15kW MGT power and 15 minutes for 20, 25kW MGT power, (4)according to increasing brine flow rate, cooling capacity shows decrease at 15kW MGT power and changes little at above 20kW MGT power.
김형식 대한용접접합학회 2004 대한용접·접합학회지 Vol.22 No.2
레이저 용접 기술은 종래의 기법에 비해 용접변형을 최소화하면서 고속용접이 가능하기 때문에 여러 분야에서 다양하게 적용되고 있다. 주로 전자, 자동차 부품 등의 용접 분야에 적용이 되고 있으나 고출력 레이저의 안정화, 와이어 첨가 레이저 용접, 레이저 아크 하이브리드 응접, 레이저 플라즈마 하이브리드 용접 등의 다양한 기술이 개발되면서 중공업, 조선 산업 분야 등에서도 적용이 확대되고 있다.(중략)