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새로운 가이드 튜브를 통한 6H-SiC 단결정의 직경 확장에 관한 연구
손창현,최정우,이기섭,황현희,최종문,구갑렬,이원재,신병철,Son, Chang-Hyun,Choi, Jung-Woo,Lee, Gi-Sub,Hwang, Hyun-Hee,Choi, Jong-Mun,Ku, Kap-Ryeol,Lee, Won-Jae,Shin, Byoung-Chul 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.9
A sublimation method using the SiC seed crystal and SiC powder as the source material is commonly adopted to grow SiC bulk single crystal. However, it has proved to be difficult to achieve the high quality crystal and the process reliability because SiC single crystal should be grown at very high temperature in closed system. The present research was focused to improve SiC crystal quality grown by PVT method through using the new inner guide tube. The new inner guide tube was designed to prevent the enlargement of polycrystalline region into single crystalline region and to enlarge the diameter of SiC single crystal. The 6H-SiC crystals were grown by conventional PVT process. The seed adhered on seed holder and the high purity SiC source materials are placed on opposite side in sealed graphite crucible surrounded by graphite insulation. The SiC bulk growth was conducted around 2300 $^{\circ}C$ of growth temperature and 50 mbar in an argon atmosphere of growth pressure. The axial thermal gradient across the SiC crystal during the growth was estimated in the range of 15${\sim}$20 $^{\circ}C$/cm.
종자정 부착 시 생성되는 마이크로 기공이 PVT법에 의하여 성장시킨 6H-SiC 결정질에 미치는 영향
김정곤,김정규,손창현,최정우,황현희,이원재,김일수,신병철,Kim, Jung-Gon,Kim, Jung-Gyu,Son, Chang-Hyun,Choi, Jung-Woo,Hwang, Hyun-Hee,Lee, Won-Jae,Kim, Il-Soo,Shin, Byoung-Chul 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.3
With different seed adhesion methods, we obtained two different aspects with or without micro-bubble in the interface between a seed and a dense graphite seed holder. To improve the quality of SiC wafer, we introduced a sucrose caramelizing step at the seed adhesion using the sucrose, The n-type 2 inch single crystal exhibiting the polytype of 6H-SiC were successfully fabricated and carrier concentration levels of about $10^{16}/cm^3$ was determined from Hall measurements, As compared to the characteristics of SiC crystal grown with micro-bubble in the interface between the seed and the dense graphite seed holder, the SiC crystal grown without micro-bubble definitely exhibited lower resistivity, lower micropipe density and higher mobility relatively.
공기기둥이 형성된 원통 용기의 내부유동 특성에 관한 수치해석 연구
손종현(Jong Hyeon Son),박일석(Il Seouk Park),손창현(Chang Hyun Sohn) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
An air core is generated during draining after rotating cylindrical tank filled with a liquid through an axisymmetrically placed circular orifice. If the air core is generated, the draining flow rate decreased and the draining time is delayed. In this study, the formation process of the air core and internal flow characteristics of a cylindrical tank is studied by numerical methods. Several methods are used in the analysis and compared with experimental results to obtain the proper scheme. Axial, radial and swirl velocity profiles on a variety of height are shown in graphs, And the internal flow structure is analyzed from the velocity profiles, the vector plot and the stream function distribution.
공기기둥이 형성된 원통 용기의 내부유동 특성에 관한 수치해석 연구
박일석(Il Seouk Park),손종현(Jong Hyeon Son),손창현(Chang Hyun Sohn) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.3
액체가 차있는 원통 용기를 회전 시킨 후 바닥 중앙에 위치한 원형 배수구로 액체를 배수시키면 공기 기둥이 형성된다. 공기기둥이 발생하면, 배수 유량이 감소하고 배수 시간도 지연된다. 본 연구에서는 공기기둥 형성과 배수과정 중의 용기내부의 유동특성을 수치해석 방법으로 관찰하였다. 다양한 격자계와 시간차분방법을 적용하였고 적합한 방식을 얻기 위해 실험결과와 비교하였다. 여러 위치에서의 축방향, 반경방향, 원주방향 속도 성분들의 분포를 시간대 별로 나타내었고, 속도 벡터와 유선 분포 도시를 통하여 내부 유동 구조를 분석하였다. An air core is generated during draining through an axisymmetrically placed circular orifice after rotating a cylindrical tank filled with a liquid. If an air core is generated, the draining flow rate decreases and the draining time increases. In this study, the process of the formation of the air core and internal flow characteristics in a cylindrical tank are studied by numerical methods. Several methods are used in the analysis, and the results are compared with experimental results to obtain the appropriate scheme. Axial, radial, and swirl velocity profiles on a variety of heights are shown graphically, and the internal flow structure is analyzed from the velocity profiles, the vector plot, and the stream function distribution.
박형종(Hyoung Jong Park),심상학(Sang Hak Shim),이병호(Byung Ho Lee),박상욱(Sang Wok Park),손창현(Chang hyun Son) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The computational studies conducted to design the shut-off valve in the LPI (Liquid Propane Injection) system. The commercial package ANSYS was utilized to calculate the fuel flow rate in the shut-off valve for various configurations. The LPI system is a new type of fuel supplying system. It is injecting LPG the manifold as a liquid phase. LPI system must supply the required level of fuel flow rate to engine and this fuel rate depends on the geometry of flow passage in the shut-off valve. The calculated results are in good agreement with the experimental data. The final geometry of flow passage that has been concluded does supply required fuel flow rate.<br/>
최동녁(Dong-Nyeok Choi),유재영(Jae-Young Yu),권장상(Jang-Sang Kwon),이우빈(U-Bin Lee),피경진(Kyeong-Jin Pi),손창현(Chang-Hyun Son),이재영(Jaeyoung Lee),이권영(Kwon-Yeong Lee),성주헌(Ju-Hun Sung) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Supercritical carbon dioxide (s-CO₂) refers to carbon dioxide that has both liquid and gas properties and can be applied to a power generation system that increases efficiency of generation while reducing the size of core machines. In particular, this study was planned to consider the possibility of applying s-CO cycles to solar systems, one of the new and renewable energies that has recently been under spotlight. For this plan, we try to design and manufacture a 15 kWth small s-CO₂ cycle experimental apparatus. First, we completed to draw T-s diagram after identifying the properties of each section of the s-CO₂ Brayton cycle through the ‘REFPROP 7.0’. Based on them, we drew Flow Diagram and Heat and Mass Balance Diagram for the cycle. Requirements have been created to select the suitable devices for the small s-CO₂ cycle experimental facility.