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박용민,장건익 한국전기전자재료학회 2001 전기전자재료학회논문지 Vol.14 No.7
Bi-2212 HTS tube was fabricated by centrifugal forming and partial melting processes. Bi-2212 bulk tube has been optimized to achieve smooth surface and uniform thickness. The slurry was prepared in the mixing ratio of 10:1 between Bi-2212 powder and binder and initially charged into the rotating mold under the speed of 300~450 rpm. Heat-treatment was performed at the temperature ranges of 860~89$0^{\circ}C$ in air for partial melting. the HTS tube fabricated by centrifugal forming process at 89$0^{\circ}C$ under the rotating speed of 450 rpm was highly densified and the plate-like grains with more than 20${\mu}{\textrm}{m}$ were well oriented along the rotating axis. The measured Tc and J$_{c}$ at 10K on specimen heat treated at 89$0^{\circ}C$ was around 85 K and 1,200 A/$\textrm{cm}^2$ respectively.y.
신생아 및 영아 혈중 Lipoprotein(a)치의 연령별 변동과 영향을 미치는 인자들에 대한 연구
박용민,임인식,이동근 중앙대학교 의과대학 의과학연구소 1995 中央醫大誌 Vol.20 No.1
Lipoprotein(a) [Lp(a)] is considered an additional, independent and largely genetically determined risk factor for the development of premature coronary heart disease. The aim of this study is to assess serum Lp(a) levels in 102 healthy newborns and to observe their evolution between 3 months, 6 months and 1 year by using ELISA method. Lp(a) is also compared with feeding formula methods and birth weight. The results obtained were as follows : 1) The level of serum Lp(a) concentrations at birth was increases significantly after 3 months to 1 year of serum Lp(a) concentrations. 2) The level of serum Lp(a) concentrationas has no significant correlations between sex and feeding formulas. 3) Teh Lp(a) value of LGA infants was higher than low birth weight infants and normal birth weight infants, but it was within normal limit. 4) There were no significant correlations between maternal serum Lp(a) concentrations and Lp(a) concentrations in her infants. In conclusion, our data suggest that the adequate timing for the screening test of Lp(a) in newborns is around 3 months after birth and we could not any statistically significant influence of the nutritional factors on the plasma Lp(a) concentrations at any age.
막분리 공정을 이용한 정수처리공정의 개발 및 장기 운영 평가
박용민,권정원,조명수 한국막학회 2015 한국막학회 총회 및 학술발표회 Vol.2015 No.11
국내 다수의 정수장이 적용하고 있는 전통적인 정수처리 공정만으로는 신규 유해물질이나 미량유해물질의 처리 보증을 할 수 없다. 안정적인 고도정수처리공정으로 막분리공정의 적용과 연구가 진행되고 있다. 원수의 특성에 따른 막여과 고도정수처리공정의 개발과 이에 대한 장기적인 검증이 필요하다. 본 연구에서는 계절에 따라 고농도의 망간이 발현되고 있는 경북 U정수장 내의 막여과 시설을 운영하면서 고도정수처리공정의 개발과 장기 성능 평가를 진행하였다. 막여과시설의 일처리용량은 1,000 m³으로 최적 운영인자 확보와 정수처리성능을 평가하였다.
박용민,송우석,이승배,Park, Yong-Min,Song, Woo-Seog,Lee, Seung-Bae 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.6
The BEM is a highly efficient method in the sense of economical computation. However, boundary integration is not easy for the complex geometry and moving surface, e.g. a rotating blade. Thus, Kirchhoff surface is designed in an effort to overcome the difficulty resulting from complex boundary conditions. A Kirchhoff surface is a fictitious surface which envelopes acoustic sources of main concern. Acoustic sources may be distributed on each Kirchhoff surface element according to their acoustic characteristics. In this study, an axial fan is assumed to have unsteady loading noise as a dominant source. Dipole sources can be modeled to solve the FW-H equation. Acoustic field is then computed by determining Kirchhoff surface on which near-field is implemented, to analyze the effect of Kirchhoff surface on it. The optimal shape and the location of Kirchhoff surface are discussed by comparing with experimental data acquired in an anechoic chamber.