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강호균(Hogyun Kang),신정헌(Jeong-Heon Shin) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Many studies have been conducted to increase the heat transfer effect in micro/mini flow channels. In this study, the phase change cooling test section using a porous membrane to separate vaporized fluid and liquid fluid was analyzed by numerical analysis using ANSYS Fluent. Three structures were designed. The first was a basic structure without a membrane, the second was a structure in which a membrane with micro pores was designed parallel to the flow path, and finally, the angle of the membrane was maintained at an angle of about 0.5 degrees to the flow path. The change in the heat transfer phenomenon according to the membrane was confirmed using the difference in the inlet and outlet differential pressures at the same flow rate and heat flux of the three structures and the heat transfer coefficient of the heat transfer surface.
Hungkuk Oh(오흥국),Hogyun Jeong 한국정신과학학회 2014 한국정신과학회 학술대회 논문집 Vol.2014 No.4
The Book of Changes comes from Hado and Naksue. Hado and Naksue come from Chunbookyung. Physics of Chunbookyung is different from modern physics in view of atomic model and elementary particle while it is equivalent to physics of the millennium seven problems. Physics of rotational electro – magnetic waves is the same as the one of chunbookyung and the one of the millennium seven problems. Physics of Chunbookyung presents energy cycling, mass gap, atomic and molecular bondings, Five Natural Elements(tree, fire, earth, metal, water), chemical reaction, cold fusion, universal gravity and energy measurement.
Jeon, B C,Kim, Choong H,Moon, S J,Choi, Woo Seok,Jeong, Hogyun,Lee, Y S,Yu, J,Won, C J,Jung, J H,Hur, N,Noh, T W IOP Pub 2010 Journal of Physics, Condensed Matter Vol.22 No.34
<P>We have investigated the electronic structure of double perovskites, Ba<SUB>2</SUB>FeReO<SUB>6</SUB> (metallic) and Ca<SUB>2</SUB>FeReO<SUB>6</SUB> (insulating) using optical and x-ray absorption spectroscopy. By comparing the experimental results with the density functional theory calculations, we found that the electronic structure of Ba<SUB>2</SUB>FeReO<SUB>6</SUB> could be determined from the interaction of the electron correlation and spin–orbit coupling. On the other hand, for Ca<SUB>2</SUB>FeReO<SUB>6</SUB>, the lattice distortion and electron correlation are important in determining the electronic structure. Additionally, the insulating gap in Ca<SUB>2</SUB>FeReO<SUB>6</SUB> is realized by the spin–orbit coupling. Our work shows that the subtle interplay of the spin–orbit interaction, electron correlation, and lattice distortion should be taken into account to understand the electronic structure of the 5d transition metal oxides. </P>