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한동희,조한구,한세원,오대희,Han Dong-Hee,Cho Han-Goo,Han Se-Won,Oh Dae-Hee 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.1
Electrical insulation is one of the most important parts in a high voltage apparatus. Traditionally mineral oils and synthetic esters have been widely used as dielectric coolants for power transformers. Recently, researchers are interested in the environmentally friendly vegetable oil from the environmental viewpoint. This paper reports on the synthesis and characterization of soybean based ester oils. Two different types of soybean based transformer oils, named as methyl ester and isopropyl ester were synthesized. The synthesis of these esters was achieved by transesterification reactions between soybean oil and alcohol in the presence of catalyst. The GC and NMR spectroscopic analysis of the esters have been performed. It was observed that isopropyl ester has better thermal resistance than methyl ester by TGA. Also, two esters have a good breakdown voltage and electrical resistance.
실리콘 고무의 소수성에 미치는 첨가된 실리콘 오일의 영향
한동희,조한구,강동필,민경은,Han Dong-Hee,Cho Han-Goo,Kang Dong-Pll,Min Kyung-Eun 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.1
This paper reports on the effects of silicone oils, used as processing agents, on the recovery of hydrophobicity of silicone rubber. The recovery of hydrophobicity was evaluated by the measuring the contact angle, the surface electrical resistance and SEM. Here, we formed artificial contamination on the surface of samples, which scratched by sand papers and alumina powders. There was small recovery of hydrophobicity on the surface of SIR-A that silicone oil was not added. In both oil-added samples, SIR-B and SIR-C, recovery of hydrophobicity was achieved greatly. The surface of SIR-C showed that a lot of silicone oil was observed due to migration of oil, relatively in comparison with SIR-B. The tendency of recovery of hydrophobicity expressed by contact angle was in a good agreement with electrical property as determined by surface resistivity.
한동희 ( Dong Hee Han ) 한국가족복지학회 2014 한국가족복지학 Vol.19 No.2
The Cyber Family program was developed by the Research Institute of Science for the Better Living of the Elderly (RISBLE) in 2006 with funding from the Korean Commission for Youth. Through the use of a website(www.wellageing.com), the program brought elders together with a younger generation of middle school students. This program encouraged the young and older generations to have open discussions on topics centered around living a meaningful life, thus promoting intergenerational integration. The Cyber Family Program utilized cyberspace to create dialogue on the website and conducted several offline events. The participants were students from 6 middle schools and 20 older persons who are members of RISBLE. The older adults, rather than giving advice, responded with sympathy toward the youth who expressed issues they had with identity. After listening to the youth express the inner chaos that they often seemed to feel, the elders responded with loving and caring comments, and a bond across generations was formed. The Cyber Family program proved to be a successful intergenerational program and way for older persons to achieve greater social integration
등가강성요소 모델을 이용한 AFM 마이크로캔틸레버의 진동해석
한동희(Dong Hee Han),김일광(Il Kwang Kim),이수일(Soo Il Lee) 대한기계학회 2015 大韓機械學會論文集A Vol.39 No.5
원자현미경(AFM)은 마이크로캔틸레버 끝단의 팁이 시료에 다가갈 때 발생하는 팁과 시료 표면 사이의 상호작용을 이용하여 시료의 다양한 특성들을 찾아내는 매우 유용한 도구이다. 본 논문에서는 이러한 AFM 마이크로캔틸레버의 팁과 시료 사이의 상호작용력을 비선형 스프링을 이용하여 동일한 강성을 갖는 요소로 모델링 하였고 유한요소법을 이용하여 시뮬레이션을 수행하였다. 또한 시뮬레이션 결과를 적합직교분해법을 이용하여 분석함으로써 AFM 마이크로캔틸레버의 복잡한 동적 특성을 파악하였으며 이를 같은 방법으로 분석한 실험 결과와 비교하였다. 그 결과 팁과 시료 사이의 상호작용력을 효과적으로 모델링 할 수 있는 방법을 제시하였으며 이러한 상호작용력으로 인해 고차모드의 영향이 증가함을 확인하였다. Atomic force microscopy (AFM) is powerful tool for determining properties of samples based on interactions between the sample surface and an approaching probe tip. In this study, we modeled the interactions between the sample and the tip of the AFM microcantilever as a single nonlinear spring with an equivalent stiffness element and simulated the dynamic behaviors of the AFM microcantilevers using the finite element method (FEM) and ANSYS software. With the simulation results, we analyzed the complex dynamic responses of the AFM cantilever using proper orthogonal decomposition (POD). In addition, we compared the simulation and experimental results using the same method. Consequently, we suggest an effective method to express the interaction between the tip and sample, and we confirm that the influence of the higher order model due to the interaction between the tip and sample is increased.