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박성근,백민수,배승춘,권성열,김광태,김기완,Park, Seong-Geun,Baek, Min-Su,Bae, Seung-Chun,Gwon, Seong-Yeol,Kim, Gwang-Tae,Kim, Gi-Wan Materials Research Society of Korea 1999 한국재료학회지 Vol.9 No.2
LiNbO$_3$films were prepared by an rf-magnetron sputtering technique using sintered target containing potassium. The potassium was included to help to fabricate stoichiometric LiNbO$_3$film. Structural and electrical properties of thin films was investigated as a function of deposition condition. Optimum sputtering conditions were rf power of 100W, working pressure of 1m Torr and substrate temperature of 58$0^{\circ}C$. The thin film was grown to (012) preferred orientation. The dielectric constant of the thin film LiNbo$_3$ fabricated under optimum condition was 55 at 1MHz. Average grain size is about 200$\AA$ and roughness of the film is small enough to apply to optic devices.
기류분사 노즐에 의한 선회 분무 화염의 구조에 관한 실험적 연구
오상헌,백민수,김동일,O, Sang-Heon,Baek, Min-Su,Kim, Dong-Il 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.4
Detailed experimental study has been made of air blast kerosene spray flames with and without swirl in combustion air flow. Phase-Doppler detect technique is used to measure Sauter mean diameter, axial component mean and rms velocity, size-velocity correlation, and number density. These measurements are obtained for both nonreacting and reacting cases under several stable flame conditions. The results show that the introduction of swirl to the combustion air modifies the spatial distribution of droplet size, velocity, and number density, and thus alters the flame structure. However, due to the weak swirl intensity, the overall structure of swirling flames are essentially same as that of nonswirling flames. Physical model of structure of air blast atomized spray flames is projected to show that spray flames are composed of three distinct regions: the two-phase mixture region, the main reaction and the intermittent combustion region. Near the atomizer, two phase mixture of droplet and air is formed in the core region. This dense spray region is characterized by high droplet number density and the strong convective effect. There follows the main combustion region where the main flame penetrates within the spray boundary. Main reaction region of these flames are governed by internal group combustion mode. Finally there exists the intermittent combustion region where local group burning or isolated droplet burning occurs.
초고강도 콘크리트의 수직, 수평부재 현장적용성을 위한 역학적 특성에 관한 연구
이근배(Lee Keun-Bae),김성덕(Kim Seong-Deok),백민수(Baek Min-Su),정상진(Jung Sang-Jin) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.8
The vertical-horizontal separated placement method (V.H. separated placement method) is being widely used for high-rise buildings as well as for general buildings. The V.H. separated placement is advantageous in that the placement is easy, e.g., using vibrating compaction, because there is no interference of slab reinforcements in the case of concrete placement for columns, and that it allows forms to be easily removed and used for the next placement section. Despite the advantages of the V.H. separated placement, the V.H. concurrent placement is used in korea to reduce the construction period, which has the self compaction property and a high viscosity that prevents segregation. In this study, the basic data for concurrent placement of the high-strength concrete, including the transport properties, the strengths of members by height, and the hydration properties, were presented with concrete specimens with different strengths. The curing methods and core strengths for members in different locations met the targeted strengths, which were 60 ㎫, 80 ㎫ and 100 ㎫, at the given aging level. The core strength increased with aging. High increase in the strength was observed especially on the lower parts of the beams and columns. As for the strength of the core by height, the strength was higher on the middle and upper sections than on the lower sections, though the differences were not significant. With the increase in the targeted strength, the peak hydration temperature was reached in a shorter time, and the temperature difference between the center and surface of the specimen was about 15℃ for each strength value.