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SLUP (Salt-Leaching Using Powder) 세포지지체의 생체 내외 거동 특성 평가
조용상(Yong Sang Cho),권미령(Quan Meiling),홍명화(Myoung Wha Hong),김영율(Young Yul Kim),조영삼(Young-Sam Cho) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In tissue engineering, salt-leaching method which is one of the conventional methods has been widely used, because if its easiness and simplicity. However, conventional salt-leaching method has some disadvantages: lack of interconnectivity and usage of solvent or high-pressure. Therefore, to overcome these drawbacks, our team developed SLUP (Salt-Leaching Using Powder) method which needs no solvent and high-pressure and provides good interconnectivity. In this study, proposed SLUP scaffold was compared to PED (Precision Extruding Deposition) scaffold using in-vivo and in-vitro experiments. Firstly, SLUP scaffold with ratio of 1:5 wt % (PCL/NaCl) was prepared. Secondly, PED scaffold was prepared with 500 micrometer strand size and 1000 micrometer distance of strands. After that, to assess cell-culture characteristics of osteoblast, scaffolds were assessed by in-vitro CCK-8 assay for 14 days. Furthermore, for in-vivo experiments, rats having calvaria defect were used.
조용상(Yong-Sang Cho),송규소(Gyu-So Song),최유성(Yu-Seong Choi),박태성(Tae-Seong Park) 대한전기학회 2011 전기학회논문지 Vol.60 No.3
The airpollutant may accelerate degradation of power line facilities, and may reduce the life of the electric facilities. In case of korea, there are a tendency that the density of air pollution may be increased by industrial development. while lack of research activity and establishment of a countermeasure on this issue. Recently the occurrence of electricity failure have been reduced on the power transmission and distribution lines. but the occurrence of electricity failure by insulator itself has been increased. It means that we should have develop more clear technique for detection of the wrong insulator. In this study to provide a method for detection of the insulator failure or effective management of the troubled insulator, we analyze the chemical composition of the insulator which used on power distribution line at the sea side locations. To define the relation between insulation and corona intensity, we design and develop an corona detector. We define the variation of insulation by pollution changes on the insulator and verify quantitative relation between corona and insulations using the corona detector.
조용상(Yong-Sang Cho),박태성(Tae-Seong Park),송규소(Gyu-So Song),최유성(Yu-Seong Choi) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
최근 송배전선로 정전발생 건수는 감소추세를 보이고 있으나, 애자고장에 의한 정전 발생건수는 증가하는 경향이다. 본 연구에서는 애자의 관리를 효율적으로 하기 위한 방법의 제시를 위해 해안 및 내륙지역에서 수거한 배전용 애자에 대하여 현장 환경조사를 거쳐 부착된 화학성분을 정밀 분석하고 분석된 화학성분을 토대로 절연저항을 측정 하였다. 측정된 절연저항과 코로나 발생의 관계를 규명하기 위하여 코로나 검출기를 활용하여 시험을 수행하였고 절연저항의 정도와 코로나 발생과의 정량적 연관성을 입증하였다.