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Hong, Gye Won,Lee, Young Min,Lee, Hee Gyoun,Jung, Choong Hwan,Shin, Hyung Sik 대한금속재료학회(대한금속학회) 2000 METALS AND MATERIALS International Vol.6 No.6
NiO films have been epitaxially grown by metal-organic chemical vapor deposition (MOCVD) on a bi-axially textured Ni substrate using Ni(thd)₂ as a precursor. The NiO film was deposited at 470℃ for 10 min at a deposition pressure of 10 Torr and oxygen partial pressure of 0.91 Torr. SEM and AFM observations for the deposited NiO film showed a smooth and dense morphology. X-ray rocking curve and φ-scan showed that the NiO film has a bi-axial texture with a (100)$lt;001$gt; orientation. The out-of-plane and the in-plane deviations were measured to be 4.2° and 6∼7° from the FWHM of (200) and (111) planes, respectively.
Direct Deposition of CeO2 Films on Ni Metal Substrate by Chemical Vapor Deposition
Hong, Gye Won,Lee, Young Min,Lee, Hee Gyoun,Jung, Choong Hwan 대한금속재료학회(대한금속학회) 2000 METALS AND MATERIALS International Vol.6 No.3
Cerium dioxide thin films have been grown in-situ directly on cube textured Ni substrate by metal-organic chemical vapor deposition (MOCVD). At a lower deposition temperature of 400℃, an amorphous film was formed. The texture of crystalline CeO₂ film was changed from (200) orientation to (111) orientation when the deposition temperature was increased from 450℃ to 550℃. The growth rate was ∼40 ㎚/min and the rms surface roughness was 50 ㎚ for the CeO₂ film deposited at 450℃ for 10 min. Surface roughness of the film was increased with the development of (111) orientation. Deposited CeO₂ film showed a mixed texture of (100)$lt;001$gt; and (100)$lt;011$gt; orientation. Depending on the deposition condition, the transition from (100)$lt;001$gt; texture to (100)$lt;011$gt; orientation was observed.
Gye-Hong Kim,Won-Zin Oh,Kune-Woo Lee,Bum-Kyoung Seo 한국방사성폐기물학회 2005 방사성폐기물학회지 Vol.3 No.3
원자력 시설의 해체 시 발생되는 다양한 종류의 폐기물 중에서 배관류를 재활용하거나 처분하기 위해서는 배관 내부의 정확한 방사선학적인 오염 특성의 평가가 선행되어야 한다. 그러나 기존의 측정법인 survey-meter를 이용한 오염도의 직접 측정은 배관 내부와 같은 국소지역의 오염 특성을 정확하게 평가할 수 없으며, 간접법을 이용한 표면오염도 측정의 경우도 시료채취의 어려움뿐만 아니라 시료채취 시 작업자의 오염 가능성이 있기 때문에 적용성에 많은 문제점이 있다. 본 연구에서는 Monte Carlo 모사기법을 이용해 직경이 작은 배관 내부의 베타선 오염도를 측정하기 위하여 플라스틱 섬광체를 모사하였으며, 모사 결과에서 베타선 에너지를 효율적으로 측정할 수 있는 최적의 플라스틱 섬광체 두께 및 형상을 도출할 수 있었다. 이 전사모사 결과를 바탕으로 섬광체의 가공 및 배관 내부에서의 검출기 이송 문제를 고려해 검출기를 제작하였으며 그 특성을 평가하였다. 그 결과 배관 내부의 오염도 측정에 적합한 검출기 성능을 확인하였고, 파이프 내부처럼 국소 지역의 방사선학적 오염 특성 평가를 위한 검출기 개발 가능성을 확인하였다. The characterization of radiological contamination inside pipes generated during the decommission of a nuclear facility is necessary before pipes can be recycled or disposed. But, existing direct measurements of radioactive contamination level using the survey-meter can not estimate the characteristic of contamination on a local area such as the pipe inside. Moreover, the measurement of surface contamination level using the indirect methods has many problems of an application because of the difficulty of collecting sample and contamination possibility of a worker when collecting sample. In this work, plastic scintillator was simulated by using Monte Carlo simulation method for detection of beta radiation emitted from internal surfaces of small diameter pipe. Simulation results predicted the optimum thickness and geometry of plastic scintillator at which energy absorption for beta radiation was maximized. In addition, the problem of scintillator processing and transferring the detector into the pipe inside was considered when fabricating the plastic detector on the basis of simulation results. The characteristic of detector fabricated was also estimated. As a result, it was confirmed that detector capability was suitable for the measurement of contamination level. Also, the development of a detector for estimating the radiological characteristic of contamination on a local area such as the pipe inside was proven to be feasible.
Precipitation-Filtering Method for Reuse of Uranium Electrokinetic Leachate
Gye-Nam Kim,Dong-Bin Shon,Hye-Min Park,Ki-Hong Kim,Ki-Won Lee,Jeik-kwon Moon 한국방사성폐기물학회 2011 방사성폐기물학회지 Vol.9 No.2
우라늄 오염토양을 동전기제염 시 많은 양의 동전기 침출액이 발생한다. 발생된 우라늄 침출액을 재이 용하기 위한 처리기술이 개발되었다. 동전기제염 시 발생된 우라늄침출액 내의 우라늄농도는 180 ppm이 었고, Mg(II), K(I), Fe(II), Al(III) 농도는 20 ppm∼1,210 ppm이었다. 우라늄침출액의 최적 처리공정은 혼합, 응집, 침전, 농축, 그리고 여과로 구성된다. 침전액의 pH를 11로 맞추기 위해, calcium hydroxide 는 3.0g/100ml 그리고 sodium hydroxide는 2.7g/100ml이 필요했다. 여러 침전실험 결과 NaOH+0.2g alum+0.15g magnetite가 여과를 위한 최적 침전혼합제로 선정되었다. NaOH+0.2g alum+0.15g magnetite 투입 시 침전입자의 평균크기는 600 ㎛이었다. pH=9에서 침전 후 상등액에 총 금속농도가 가 장 낮았기 때문에, 최적 침전을 위하여 먼저 0.2g/100 ml alum와 0.15g/100ml magnetite 투입한 후pH=9일 때까지 sodium hydroxide을 투입하여야 한다
Effects of secondary tasks on brake time of taxi drivers during unexpected situation
Hong-Won Yeon,Hee-Yong Shin,Hee-Jeong Yoon,Han-Soo Kim,Doo-Hwan Ji,Byung-Chan Min,Gye-Rae Tack,Soon-Cheol Chung 대한인간공학회 2011 대한인간공학회 학술대회논문집 Vol.2011 No.5
Objective: The purpose of this study was to investigate the effects of the secondary tasks such as sending text message (STM) and searching navigation (SN) on brake time of taxi drivers when it happen unexpected situation during driving. Background: There are so many researches that driving performance of ordinary people was affected by cell phone conversations and watching TV. But there are no researches about driving performance of taxi drivers. Method: The participants included 15 taxi drivers; 7 males aged 57.7±4.2 with 28.0±7.5 years of driving experiences and 8 females aged 56.0±2.8 with 22.7±5.2 years of driving experiences. All subjects were instructed to keep a certain distance (30m) from the car ahead and a constant speed (80km/h or 100km/h). The brake time after unexpected situation was measured. Results: The brake time was more faster during driving only than the driving with secondary tasks. Driving performance was more affected by driving with searching navigation(SN) than sending text message(STM).
Hong-Gye Sung,Seong-Jin Kim,Hyo-Won Yeom,Hyo-Won Yeom,Jun-Young Heo 한국항공우주학회 2013 International Journal of Aeronautical and Space Sc Vol.14 No.4
An assessment of two-equation turbulence models, the low Reynolds k-ε and k-ω SST models, with the compressibility corrections proposed by Sarkar and Wilcox, has been performed. The compressibility models are evaluated by investigating transonic or supersonic flows, including the arc-bump, transonic diffuser, supersonic jet impingement, and unsteady supersonic diffuser. A unified implicit finite volume scheme, consisting of mass, momentum, and energy conservation equations, is used, and the results are compared with experimental data. The model accuracy is found to depend strongly on the flow separation behavior. An MPI (Message Passing Interface) parallel computing scheme is implemented.
Spark Plasma Sintering of Fe-Ni-Cu-Mo-C Low Alloy Steel Powder
Nguyen, Hong-Hai,Nguyen, Minh-Thuyet,Kim, Won Joo,Kim, Ho Yoon,Park, Sung Gye,Kim, Jin-Chun The Korean Powder Metallurgy Institute 2016 한국분말재료학회지 (KPMI) Vol.23 No.3
In this study, Fe-Cu-Ni-Mo-C low alloy steel powder is consolidated by spark plasma sintering (SPS) process. The internal structure and the surface fracture behavior are studied using field-emission scanning electron microscopy and optical microscopy techniques. The bulk samples are polished and etched in order to observe the internal structure. The sample sintered at $900^{\circ}C$ with holding time of 10 minutes achieves nearly full density of 98.9% while the density of the as-received conventionally sintered product is 90.3%. The fracture microstructures indicate that the sample prepared at $900^{\circ}C$ by the SPS process is hard to break out because of the presence of both grain boundaries and internal particle fractures. Moreover, the lamellar pearlite structure is also observed in this sample. The samples sintered at 1000 and $1100^{\circ}C$ exhibit a large number of tiny particles and pores due to the melting of Cu and aggregation of the alloy elements during the SPS process. The highest hardness value of 296.52 HV is observed for the sample sintered at $900^{\circ}C$ with holding time of 10 minutes.
운전 중 동시과제 수행이 택시 운전자의 피부전도도에 미치는 영향
연홍원(Hong-Won Yeon),윤희정(Hee-Jeong Yoon),신희용(Hee-Yong Shin),김한수(Han-Soo Kim),지두환(Doo-Hwan Ji),민병찬(Byung-Chan Min),탁계래(Gye-Rae Tack),정순철(Soon-Cheol Chung) 한국산업경영시스템학회 2011 한국산업경영시스템학회 학술대회 Vol.2011 No.-
The purpose of this study was to investigate the effects of the secondary tasks such as sending text message (STM) and searching navigation (SN) on skin conductance level (SCL) during driving. The participants included 29 taxi drivers; 14 males aged 56.7 ± 4.3 with 29.7 ± 7.0 years of driving experiences and 15 females aged 55.5 ± 3.5 with 20.1 ± 5.7 years of driving experiences. All subjects were instructed to keep a certain distance (30m) from the car ahead and a constant speed (80㎞/h or 100㎞/h). SCL was measured during driving only and driving with secondary tasks. SCL was more increased during the driving with secondary tasks than driving only. By increasing the driving speed, SCL was increased during the driving with secondary taks. Secondary tasks increased an activation of sympathetic nerve system. However, there were no significant differences in the SCL according to gender.
Performance Analysis of an Aircraft Gas Turbine Engine using Particle Swarm Optimization
Jae Won Choi,Hong-Gye Sung 한국항공우주학회 2014 International Journal of Aeronautical and Space Sc Vol.15 No.4
A turbo fan engine performance analysis and the optimization using particle swarm optimization(PSO) algorithm have been conducted to investigate the effects of major performance design parameters of an aircraft gas turbine engine. The FJ44-2C turbofan engine, which is widely used in the small business jet, CJ2 has been selected as the basic model. The design parameters consists of the bypass ratio, burner exit temperature, HP compressor ratio, fan inlet mass flow, and nozzle cooling air ratio. The sensitivity analysis of the parameters has been evaluated and the optimization of the parameters has been performed to achieve high net thrust or low specific fuel consumption.