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인덕션 조리용기용 도전성 Paste의 Silver 및 Glass Frit 함량 변화에 따른 미세구조 및 전기적 특성 고찰
구현호,김봉호,윤영준,Gu, Hyun Ho,Kim, Bong Ho,Yoon, Young Joon 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.11
Induction cooktop has a great attention due to its safety, quick heating and cleanness compared to gas oven. However, the materials for induction cookware is limited to steel or stainless-steel which has the magnetic property. Recently, it has been tried to apply various porcelain to induction cookware after printing the silver layer on the bottom of cookware plates and co-firing at high temperature. Glass frits are added in the silver paste to improve an adhesion force between porcelain materials containers and transferred silver layer. The hybrid silver pastes for induction cookware requires the proper electrical resistance and the thermal conductivity with base plates. After sintering process at $800^{\circ}C$, a part of melted glass migrated to the porcelain and the rest of the glass frit was exposed to the surface. It was confirmed that most of the glass frit formed an adhesion layer between the porcelain and transferred silver layer that enhances the adhesion force.
구현호,박종률 한국교원대학교 학교체육연구소 2010 학교체육연구소지 Vol.17 No.1
This research paper aims at inquiring how the swimming class applied with peer teaching model changes the middle school students' exercise skills, attitudes, and interests about physical studying and investigating the learning effect of physical studying
선박엔진의 실린더 라이너의 손상 진단을 위한 진동 분석법
구현호(Hyunho Koo),조연상(Yonsang Cho),박준홍(Junhong Park),박흥식(Heungsik Park) 한국트라이볼로지학회 2014 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.30 No.1
Damage to the cylinder liner of large ship engines, such as scuffing on the surface, can occur very easily because it is operated in a corrosive environment. This scuffing may be due to oil film destruction and corrosive wear caused by water and sulfur included in the fuel, abrasive impurities, and poor lubricants. Thus, a method for monitoring the condition and diagnosing the failure of the cylinder liner and piston ring is needed. In this study, a reciprocating friction and wear test was carried out with a cast iron specimen, which simulated an engine cylinder in a corrosive atmosphere. The lubricants used were base oil, stirred oil with distilled water, a NaCl solution, and dilute sulfuric acid. The friction coefficient and frequency spectrum were measured using a load cell and acceleration sense in each experimental condition. We then used these results to diagnose the failure of the cylinder liner.
선박 엔진의 실린더 라이너용 합금주철의 부식마멸에 미치는 분위기의 영향
구현호(Hyunho Koo),조연상(Yonsang Cho),조화영(Hwayoung Cho),박흥식(Heungsik Park) 한국트라이볼로지학회 2012 한국윤활학회지(윤활학회지) Vol.28 No.5
The engine of a large ship operates under wet conditions using a fuel such as bunker C oil, which includes sulfur and many impurities. A cylinder liner made of cast iron is very susceptible to damage such as scuffing on the surface. This scuffing can reliably be attributed to the destruction of the oil film and the corrosion wear caused by water and sulfur included in the fuel, along with abrasion impurities and poor lubricants. In this study, a reciprocating friction and wear test was carried out with a cast iron specimen, which was used to simulate an engine cylinder in a corrosive environment. Base-oil and stirred oil containing distilled water, NaCl solution, and dilute sulfuric acid were used as lubricants. The friction surface was analyzed using a microscope and EDAX, and the friction coefficient was measured using a load-cell under each experimental condition. We then attempted to investigate the damage to the cylinder liner using the results.
영상처리에 의한 블랭크 가공품의 치수측정을 위한 형상요소 추출법에 관한 연구
조연상,전성재,구현호,박흥식 朝鮮大學校 機械技術硏究所 2005 機械技術硏究 Vol.8 No.1
In the design process of a press product, the reverse engineering is a necessary process. Therefore, the method of measurement must be constructed for a blank shape. In order to measure a blank shape, the vision system with non-distortion ren was constructed, and the image processing, the shape recognition and the element extraction module was made with the Visual C++ language. For the shape recognition, the distance-angle function with a shape characteristics ware used and, for the shape of element extraction, the slop function with a element characteristics was used. In this study, the shape of the rectangular gage block and circular product with a simple shape was recognized and elements in the polygon were extracted by using this system.