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윤여원(Yun Yeo Won),문창만(Mun Chang Man),김건흥(Kim Geon Heung) 한국지반공학회 2004 한국지반공학회논문집 Vol.20 No.3
Environmental impact of waste tires as ground-reinforcing material is studied, Analysis for chemical compounds and toxic effect were performed on effluents from twelve lysimeters in which waste tires were mixed with sand and three initially different environmental solutions of acidic, neutral, and basic circulated through the mixture. The test results of effluents collected from the lysimeters provided that the contaminant concentrations were lower than those of Korean drinking water standards for all the selected and tested metal elements. While iron concentration increased slightly with the exposure period, other metal concentrations decreased with the number of circulation times. From the comparison with previous investigations, the contaminant concentration decreased with the increase of tire size, i.e. increases with the increase of the exposed surface of tire metals. From the toxicity tests, no deteriorative effect was observed and it could be concluded that waste tires are not biologically hostile materials.
상(이미지)/회절도형 형성의 광학적 원리를 이해하기 위한 실험장치 제작
김진규,정종만,김문창,최주형,김윤중,Kim, Jin-Gyu,Jeong, Jong-Man,Kim, Mun-Chang,Choi, Joo-Hyoung,Kim, Youn-Joong 한국현미경학회 2007 Applied microscopy Vol.37 No.3
본 장치는 실험자가 레이저 빔과 광학 렌즈를 조정하여 이미지 및 회절도형의 형성, 보강 및 소멸간섭과 같은 파동광학 현상을 이해하도록 제작된 실험 장치이다. 실험장치는 광원으로 쓰이는 레이저빔과 빔의 광축을 정렬하는 광원 부분과 시료대, 대물렌즈, 중간렌즈, 확대렌즈, CCD system, 컴퓨터, 그리고 렌즈를 상하 조절하는 경통부분으로 구성된다. 본 장치를 통해서 다양한 회절격자의 이미지 및 회절도형을 최대 약 44배 확대할 수 있고, 최대 약 5um의 분해능을 가지고 분석할 수 있다. 이 장치는 전자현미경 이용자들이 TEM의 원리를 보다 쉽게 이해하는데 도움을 주리라 기대한다. We have made an optical device to study the wave optics phenomena, such as image and diffraction pattern, constructive and destructive interference, by direct operation of laser beam and optical lenses. It consists of laser beam, goniometer, objective lens, intermediate lens, projection lens, CCD system, and computing system. As a result of the performance test, we were able to magnify samples up to 44 times with the resolution of about $5{\mu}m$. It is expected to help EM users understanding more easily principles of transmission electron microscopy (TEM).