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EFG법에 의한 ${\gamma}-6Bi_2O_3 {\cdot}SiO_2$(BSO)단결정의 육성
김호건,유건종,Kei-Miyamto 한국결정성장학회 1991 韓國結晶成長學會誌 Vol.1 No.1
광기능소자로 응용성이 넓은 전기광학결정 $r-6Bi_2O_3{\cdot}SiO_2$(이하 BSO로 약칭)을 EFG(Edge-defined Film-fed Growth)법에 의하여 판상단결정으로 육성하는 기초적 조건을 조사하고 육성된 판단결정의 characterization 및 평가와 물성측정을 하였다. 본 연구에서 얻어진 최적성장조건은 온도구배가 $24^{\circ}C/cm$, 인상속도는 2.0mm/h이었다. 결정성장 최적조건에서 육성된 BSO결정은 제 2상의 석출이 없고 grain boundary가 존재하지 않으며 X선 분석으로도 단결정임이 확인되었다. 육성된 판상단결정의 판면은 (100)면이었고 결정성장 방위는 <100>이었다. 육성된 판상단결정은 편광현미경하에서는 pore, void, inclusion, striation 등의 성장결함이 없는 양질의 단결정이었으나 미세결함인 전위(dislocation)의 존재가 확인되었고 전위밀도는 $5.1{\times}10^5/\textrm{cm}^2$이었다. The fundamental conditions for growing $r-6Bi_2O_3{\cdot}SiO_2$(BSO) single crystal plates by EFG(Edge-defined Film-fed Growth) method, were investigated and characterization, quality test, property measurement were performed for obtained BSO single crystal plates. The opti$\mu$ growing conditions determined in this study were as follows: ${\cdot}$temperature gradient;$24^{\circ}C/cm$ ${\cdot}$pulling rate;2.0mm/h. BSO Single crystal plates grown at the above optimum conditions did not include secondary phase or grain boundary and were confirmed as single crystals by X-ray analysis. IT was found that the single crystal plates had <100> growth direction. G defects, ie pore, void inclusion, striation, were not detected in the single crystal plate under polarizing microscope but dislocations(microscopic defect) were found and dislocation density was $5.1\times10^5/cm^2$.
EFG법에 의한 ${\gamma}-6Bi_2O_3{\cdot}GeO_2$
김호건,유건종,Kei-Miyamoto 한국결정성장학회 1991 韓國結晶成長學會誌 Vol.1 No.2
The fundamental conditions for growing $r-6Bi_2O_3{\cdot}GeO_2$ (BGO) single crystal plates by EFG (Edge -defined Film-fed Growth) method, were investigated and the characterization, quality test were carried out for obtained BGO single crystal plates. The optimum growing conditions determined in this study were as follows: ${\cdot}$ temperature gradient: 22^{\circ}C/cm 광기능소자로 응용성이 넓은 전기광학결정 $r-6Bi_2O_3{\cdot}GeO_2$(이하 BGO로 약칭)을 EFG(Edge-defined Film-fed Growth)법에 의하여 판상단결정으로 육성하는 기초적 조건을 조사하였고 얻어진 판상단결정의 characterization 및 평가를 행하였다. 본 연구에서 얻어진 최적성장조건은 온도구배가 $22^{\circ}C$/cm 이었고 인상속도는 2.0mm/h이었다. 결정성장 최적조건에서 육성된 BGO결정은 제 2상의 석출이 없고 grain boundary가 존재하지 않으며 X선분석으로도 단결정임이 확인되었다. 육성된 판상단결정의 판면은 (100)면이었고 결정성장 방위는 <110>이었다. 육성된 판상단결정은 편광현미경하에서는 pore, void, inclusion, striation등의 성장결함이 없는 양질의 단결정이었으나 미세결함인 전위(dislocation)의 존재가 확인되었고 전위밀도는 $7.0{\times}105/cm^2$이었다.
김정수(Kim jung-su),배광호(Bae khwang-ho),유건종(Yoo gun-jong) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
With increasing concerns of low carbon green growth, effective mass transit system, such as subway, train and bus, draws big interests. Among those public transportations, more than 7.21 million people use the Seoul metropolitan subway network daily. And subway's proportion of trips by mode is expected to be increased to 38.6 percent by 2021. As more people use the subway system, the indoor air quality of the subway has become a key issue. However, there is no established proof or quantitatively verified data for natural ventilation effect of EMU(electric multiple unit). In this study, the quantities of the incoming fresh air, circulating return air and exhausting emission air were measured. The measured data showed that the natural ventilation by EMU had enough ability to keep clean air in the subway train.
권순박(Kwon Soon-Bark),김세영(Kim Se-Young),조영민(Cho Youngmin),박덕신(Park Duck-Shin),배광호(Bae Khwang-Ho),유건종(Yoo Gun-Jong),김정수(Kim Jung-Su) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Air conditioning of subway cabin is achieved by two separate air conditioners installed on the top of the cabin. Cooling air is supplied through the line duct on the ceiling through the whole cabin indoor evenly, and the return air is exhausted to the center area of ceiling. Depending on the indoor air quality, outdoor air is introduced into the cabin. A part of air is pressurized out through the exhaust duct by the positive pressure condition of cabin indoor. However, cabin indoor is not always maintained in a positve pressure by frequent door opening during operation. Therefore, outdoor air can be introduced through exhaust fan and tunnel air, highly polluted by fine particles can cause a indoor air pollution. In this study, we measured air velocity, pressure difference, and particle concentration in order to reveal the inflow of outdoor air. We found that outdoor air was introduced during the subway acceleration by the inertial force of indoor air.
권순박(Kwon Soon-Bark),조영민(Cho Youngmin),박덕신(Park Duck-Shin),김세영(Kim Se-Young),박재형(Park Jaehyung),조관현(Cho Goan-Hyun),유건종(Yoo Gun-Jong),김정수(Kim Jung-Su) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
Management of indoor air quality of underground subway station is an important issue since the limited natural ventilation, limited sunshine incoming, and highly moistured atmosphere. The improvement in IAQ of platform is expected because most stations were installed with platform screen door currently, however, the poor air quality in tunnel might be affecting subway cabin indoor. In this study, we developed the air quality assessment model based on computational fluid dynamics. The geometry of air ventilation unit, seat, LCD monitors, and passengers were modeled using commercial software (Design Modeler) and fluid pattern and pollutants trajectories were analyzed by using CFX. We predicted the thermal comfort by predicted mean vote (PMV), distribution of CO2 and PM10 concentration. It is expected that this model can be used for the performance test of air cleaners which are under development.