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공학기술교육인증 프로그램의 효과적인 운영 사례에 관한 연구
이연신(Youn-Sin Lee),한재호(Jae-ho Han),김항우(Hang-Woo Kim) 한국공학교육학회 2016 공학교육연구 Vol.19 No.2
An engineering educational servery for graduating seniors had been conducted in Songwon University to improve engineering program objectives. The analysis results show that the current engineering educational objectives need to be modified to satisfy the ABEEK accredited criteria and engineering curriculum returning is necessary to include more design courses.
이연신(Youn-Sin Lee)김항우(Hang-Woo Kim),한재호(Jae-Ho Han) 한국공학교육학회 2012 공학교육연구 Vol.15 No.6
In this paper, we present, based on a systematic job analysis, the definition, flowchart and description of Ship Building & Ocean Engineering Technician’s job in Ship Building & Ocean Engineering Industry for developing an Ship Building & Ocean Engineering education and training program in the context of Korea situation. In addition, it is suggested that the courses be directed toward job site-centered reform through conducting job analysis with experts in the environmental industry. serving new courses demanded by industries in practice and providing training programs for industries.
정밀주조 다이캐스팅을 이용한 자동차 레귤레이터 하우징 성형해석에 관한 연구
성백섭(Back-Sub Sung),김미애(Mi-Ae Kim),차용훈(Yong-Hoon Cha),김정대(Jung-Dae Kim),김덕중(Duck-Joong Kim),이연신(Youn-Sin Lee) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
The casting defects that are caused by molten metal were cold shut formation, entrapment of air, gas, and inclusion. But the control of casting defects has been based on the experience of the foundry engineers. In this thesis, the computer simulation analyzed the flow of molten metal. The quantitative analyses which proposed the effective mold design was executed Flow patterns of 0.1-0.16㎧ molten metal in 15㎜ thin plate casting were investigated in order to optimize die-casting process. As increasing ingate velocity in thin plate casting, cold shot was decreased. The parameters of runner shape that affected on the optimized conditions that was calculated with simple equation were investigated. These die casting process control techniques of automobile regulator housing parts have achieved good agreement with the experimental data of tensile strength, hardness test, and material structure photographies satisfactory results.
자동차 부품 소재 개발에 따른 캐스팅 과정의 부품 내부온도 거동에 관한 연구
차용훈(Cha Young-Hoon),성백섭(Sung Back-Sub),장훈(Jang Hoon),김미애(Mi-ai kim),김정대(jung-Dae Kim),김선진(Sun-jun Kim),김덕중(Duck-joong Kim),이연신(Youn-sin Lee) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
The casting defects that are caused by molten metal were cold shut formation, entrapment of air, gas, and inclusion. But the control of casting defects has been based on the experience of the foundry engineers. In this thesis, the computer simulation analyzed the flow of molten metal. The quantitative analyses which proposed the effective mold design was executed Flow patterns of 0.15-0.16m/s molten metal in 15 mm thin plate casting were investigated in order to optimize die-casting process. As increasing ingate velocity in thin plate casting, cold shot was decreased. The parameters of runner shape that affected on the optimized conditions that was calculated with simple equation were investigated. These die casting process control techniques of automobile valve body mid-plate have achieved good agreement with the experimental data of tensile strength, hardness test, and material structure photographies satisfactory results.
압력용기 구조물 용접부에서 잔류응력이 피로균열진전거동에 미치는 영향
이연신,차용훈,김덕중,성백섭 朝鮮大學校 機械技術硏究所 1999 機械技術硏究 Vol.2 No.2
This paper is to investigated the influence of welding residual stresses on the fatigue crack growth behaviors in the vertical direction to the weld bead. So, Co₂Automatic welding was performed on the ASTM A5l6 grade 60 Steel. For skip and continuous fillet welding, the specimens of fatigue cracks are initiated at toe end and beginning of welded specimen. The fatigue life of continue fillet welding is greater then that of skip fillet welding. The fatigue lief of as welded specimen is longer than that of PWHT specimen because the compression residual stress are greater than the other zone, which are near the welding toe notch of welded specimen. For skip and continuous fillet welding, da/dN-ΔK relations show retardation at HAZ and increase linearly at the stable growth region.
신경회로망을 이용한 맞대기 용접부의 잔류응력 예측에 관한 연구
차용훈,이연신,성백섭 朝鮮大學校 機械技術硏究所 2000 機械技術硏究 Vol.3 No.2
In order to achieve effective prediction of residual stresses, the series experiment were carried out and measured the residual stresses using the backpropagation algorithm from the neural network and the sectional method. Using the experimental results, the optional control algorithms using a neural network should be developed in order to reduce the effect of the external disturbances on during GMA welding processes. Then the results obtained from this study showed that through comparison between the measured and calculated results, the neural network based on backpropagation algorithm might be controlled weld quality. This system can not only help to understand the interaction between the process parameters and residual stress, but also, improve the quantity control for welded structures.