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고창호,현종각,백영현 고려대학교 공학기술연구소 1986 고려대학교 생산기술연구소 생기연논문집 Vol.22 No.1
A mathematical model describing heat transfer in the continuous casting of slab is proposed. The model consists of a unidimensional transient conduction equation arid boundary condition equations which specify heat flux at the metal-mold interface. The proposed model is characterized by followings: 1) the length of the mush (liquid-solid) region was estimated by experimental data and 2) the internal heat generation term was introduced to the main heat balance equation. By using FDM, cooling of slab was simulated at various casting conditions, and surface temperature as well as the locations of liquidus and solidus were determined as a function of casting distance. The results thus obtained revealed that the model fits better for the measured temperature profile.
주파수영역 확산 광 단층촬영 시스템의 성능평가 및 최적화에 관한 연구
전영식,고창호,백운식 慶熙大學校 레이저 工學硏究所 2007 레이저공학 Vol.18 No.-
As one of the new modality for imaging in vivo, Diffuse Optical Tomography(DOT) utilize near-infrared(NIR) laser sources and detector arrays by which the photon transport is dominated by scattering rather than absorption in human tissue. In this paper, we developed a frequency-domian DOT system. We optimized the system by measuring and analyzing the characteristics of each separated modules.
Effect of ultrasonic waves on dissociation kinetics of tetrafluoroethane (CH2FCF3) hydrate
홍혜정,고창호,송명호,이상용,성관제 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.41 No.-
The effect of ultrasonic waves on formation and dissociation kinetics of gas hydrates has beenexperimentally studied by several researchers. Some results indicated that ultrasonic waves have theeffect of reducing gas hydrate induction time before the initiation of hydrate formation, while othersreported on the effect of prohibiting the growth kinetics during hydrate formation. There have also beenreports regarding an increase in the amount of gas consumed and a decrease in the hydrate formationtime. The present study examines the influence of ultrasonic waves on gas hydrate dissociation. Gashydrate formation and dissociation occurred in a temperature-controlled 15 L horizontal cylindricalreactor. The reactor was agitated with a pair offlat blades installed in radial direction and a pair of rollers,which were driven by a motor connected through a magnetic coupler. R-134a, a gas that can formhydrates at a relatively low pressure, was used to form gas hydrate slurry. Dissociation was augmented by20 kHz ultrasonic waves generated with a piezoelectric converter and transmitted through a vibratinghorn whose tip was in contact with the hydrated slurry in the reactor. To compare the effect of energyinput in the form of ultrasonic waves with that of the same amount of heat input, equivalent amount ofheat was provided to the reactor. Dissociation rate and the accumulated dissociation time were comparedbetween the cases of heat addition and ultrasonic wave irradiation. Results show that not only does thedissociation rate increase with an increase in the ultrasonic wave power, but the irradiation of ultrasonicwaves also enhances the dissociation of R-134a hydrate more effectively than the application of anequivalent amount of energy in the form of heat at the same location.