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Development of noise pattern map for predicting refrigerant-induced noise in refrigerators
김민성,정의봉,한형석 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.9
In refrigeration systems, flow state in evaporators is two-phase. Acoustic characteristics of noise generated in pipes with two-phaseflow depend on flow patterns and instantaneous cycle conditions. Refrigerant-induced noises are irregular and have a band frequency. Therefore, it is difficult to predict the occurrence conditions of refrigerant-induced noise in evaporators. Hence, the development of adesign guide that anticipates the occurrence of refrigerant-induced noise is important. Flow pattern maps have been proposed by Baker,Hewitt, Taitel-Dukler, etc. However, these do not consider the acoustic viewpoint and cannot predict refrigerant-induced noise basedsolely on the estimated flow patterns. Therefore, in this study, we suggest a noise pattern map for directly anticipating refrigerant-inducednoise from various flow patterns. We performed experiments using R600a refrigerant and refrigerant-supply equipment designed for flowvisualization and flow regime transition. Based on experimental data, we suggest a noise pattern map for determining the level of refrigerant-induced noise.
김민성,박세운 한국재무학회 2014 한국재무학회 학술대회 Vol.2014 No.08
본 연구에서는 국민은행이 제공하는 아파트 가격을 이용하여 공간회귀모형으로 아파트가격 결정요인을 분석하였다. 강남 3구 아파트간에 양(+)의 공간상관관계가 존재하는 것으로 나타났고, 아파트간 공간상관성이 있으면 OLS모형추정보다 SLM모 형추정이 더 우수하다. 아파트가 초등학교, 고등학교, 종합병원과 가까울수록 아파트 가격이 높은 것으로 나타났다. 강남 3구는 소득 수준이 높고 세대별 및 인구 대비 자가용 비율이 높고, 교통 인프라가 잘 구축된 지역이어서 지하철 접근성이 아파트 가격에 영향을 주지 않는 것으로 나타났다.
참옻 추출물의 MCF-7 인체 유방암 세포에서 증식 억제효과
김민성,안원근,이장천,Kim, Min Sung,An, Won Gun,Lee, Jang Cheon 대한한의학방제학회 2016 大韓韓醫學方劑學會誌 Vol.24 No.4
Objectives : The purpose of this study was to investigate the anti-cancer effects of extract of Rhus verniciflua Stokes (RVS) in human breast cancer cell lines. Methods : In cultured human breast cancer MCF-7 cells, we investigated growth inhibitory effect of RVS. MCF-7 cells were cultured with various concentrations (0, 200, 300, and 400 ug/ml) of RVS at $37^{\circ}C$ for 24 h. We performed CCK-8 assay and flow cytometry for detection of Annexin V-PI staining. Results : As a result, RVS inhibits the cell growth and induction of apoptosis in dose dependent manner in MCF-7 breast cancer cells. Conclusion : RVS has anti-cancer activities and induced apoptosis in human breast cancer MCF-7 cells. Therefore we suggest that RVS can use as a novel class of anti-cancer drugs.