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구본상 ( Bon-sang Koo ),정구현 ( Gu-hyun Jung ),김아현 ( A-hyun Kim ),이호진 ( Ho-jin Lee ) 한국정보처리학회 2020 한국정보처리학회 학술대회논문집 Vol.27 No.2
사회적 취약계층을 화재, 재난 등의 위협뿐만 아니라 프라이버시 침해로부터도 보호할 수 있는 지능형 스마트 홈 CCTV이다. 해당 연구는 소프트웨어 중심의 작품으로 어떠한 CCTV에도 적용할 수 있도록 하였다.
냉각공정에 따른 AISI 4140 강의 표면 및 트라이볼로지 특성
조학래(Hak-Rae Cho),이상돈(Sang Don Lee),손정호(Jung Ho Son),정구현(Koo-Hyun Chung) 한국트라이볼로지학회 2016 한국윤활학회지(윤활학회지) Vol.32 No.5
AISI 4140 steel is widely used in various mechanical components owing to its superior mechanical properties. Surface hardening techniques are often used to further improve the properties, particularly for applications with moving components. The aim of this research is to understand the effect of heat treatment process on surface properties and tribological characteristics of AISI 4140 steel. In this work, we prepare two different AISI 4140 steel specimens- one cooled by air and one by oil- and determine surface properties such as surface topography and roughness using a confocal microscope. We also observe the cross-sections of the specimens using a scanning electron microscope to understand the difference in the material structure. In addition, we assess the hardness with respect to the distance from the surface using a micro-Vickers hardness tester. After characterizing the surfaces of the specimens, we investigate the wear characteristics of the specimens under hydrodynamic lubrication. The results show the presence of grooves on the surface of the oil-cooled specimens. It is likely that such grooves are formed during the cooling process using the oil. However, we observe no other significant differences in the surface properties of the specimens. The wear test results show the occurrence of severe wear on the oil-cooled specimens, which may be due to the groove formed on the surface. The results of this work may be helpful to improve surface properties using surface hardening techniques from a tribological perspective.