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Al7075-T6의 압축잔류응력 및 피로 수명에 미치는 재피닝의 효과
오성훈(Sung-Hun Oh),이용성(Yong-Sung Lee),정성균(Seong-Kyun Cheong) 한국생산제조학회 2016 한국생산제조학회지 Vol.25 No.4
The effects of re-peening on the compressive residual stress and fatigue life of Al7075-T6 were investigated. The compressive residual stress induced on the surface of components by shot peening is known to increase the fatigue life. However, the fatigue load relaxes the compressive residual stress of components. Re-peening is a technique to again induce the relaxed compressive residual stress and increase the total fatigue life of components. In this study, the re-peening process was applied to fatigue-loaded specimens. The compressive residual stress and fatigue life were examined for re-peened specimens with fatigue ratios of 30%, 50%, and 70%. The results showed that the compressive residual stress of the specimens was relaxed under the fatigue load. The re-peening process significantly increases the compressive residual stress and total fatigue life.
승용차부품의 정면밀링가공시 공구마모 및 표면거칠기 특성에 관한 연구
김성일(Seong-Il Kim),오성훈(Seong-Hun Oh),문상돈(Sang-Don Mun),김태영(Tae-Young Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
The characteristics of tool wear and surface roughness in machining automobile parts have the paramount importance in improving the productivity. Therefore, the width of flank wear, cutting force, and surface roughness are monitored to analyse characteristics of tool and surface roughness. The experimental investigation is mainly focused on the characteristics of tool wear and surface roughness in machining automobile parts by using uncoated tungsten carbide tool(WC). TiN coated tool, and cermet tool.<br/>
이진호(Jin-Ho Lee),오성훈(Seong-Hun Oh) 한국산학기술학회 2014 한국산학기술학회 학술대회 Vol.- No.-
본 논문에서는 도시 외각 지역의 경사로에서의 이동약자의 이동을 수월하게 하기 위하여 이동 보조 장치를 제작하였다. 1차 2차 설계를 통해서 장치의 안정성을 높였고, 응력해석을 통하여 분석하였다.
초등학교 수학에서 삼각형의 내각의 합의 도입과 설명 방법
홍갑주 ( Hong Gap Ju ),오성훈 ( Oh Seong Hun ) 한국수학교육학회 2018 初等 數學敎育 Vol.21 No.1
본 연구는 초등학교 수학에서 삼각형의 내각의 합이 가지는 교육적 의미를 고찰하고, 그 의미를 충실하게 전달하는 도입과 설명방법을 논의한다. 먼저 우리나라 역대 교육과정에서 삼각형의 내각의 합을 어떻게 도입하는지 조사하고, 교사들의 경험과 의견을 설문하였다. 그 결과를 각 모으기 활동과 각도 측정 활동의 맥락, 삼각형 내각의 합의 불변성의 전달방법, 기타 세부적인 사항이라는 세 주제로 정리하여 논의하였다. This study examines the educational meaning of the sum of the angles of a triangle in elementary school mathematics and discusses the introduction and explanation methods to convey the meaning faithfully. First, we investigated how to introduce the sum of the angles of a triangle in the Korean national mathematics curriculums from the past to the present and surveyed the experiences and opinions of the teachers. The results of the survey are summarized and discussed in three parts: The context of ‘arranging angles activities’ and ‘measuring angles activities’, the methods to convey the meaning of the sum of the angles of a triangle as an invariance, and other details.
오성훈,이규창,김헌주,한용표 대한신경외과학회 1981 Journal of Korean neurosurgical society Vol.10 No.2
A case of chronic subdural hematoma aggravated after cervical myelography is reported. The patient was recovered after simple drainage of the hematoma. Various complications of lumbar puncture and myelography are reviewed.
금형용 고경도재의 고속정면밀링 가공시 CBN 공구의 성능에 관한 연구
문상돈,오성훈,김성일,김태영 전북대학교 공업기술연구소 1997 工學硏究 Vol.28 No.-
This paper presents the performance of CBN tools in the machining of hardened die-materials, STD11 and STD61 steel with H_RC 50, by high-speed face milling. Generally, grinding of EDM is used to machine hardened materials but so costly. If those can be replaced by cutting, it will be a greatly economical advantage. CBN tool has been recognized the effectiveness in turning, not yet in milling. So wear and surface roughness mode of CBN tool for hardened STD11 and STD61 steel will be investigated by high-speed face milling in this study.