• 제목/요약/키워드: 박윤기

검색결과 221건 처리시간 0.057초

주철 보수 용접시 Hammer Peening에 의한 잔류응력 재분포에 관한 연구 (A Study on the Redistribution of Residual Stress Induced by Hammer Peening after Cast Iron Welding)

  • 박윤기;김경규
    • 대한용접접합학회:학술대회논문집
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    • 대한용접접합학회 2004년도 추계학술발표대회 개요집
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    • pp.286-288
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    • 2004
  • The purpose of this study is to evaluate the effects of hammer peening on the redistribution of residual stress at the repair weldment of cast iron using FEA. The FEA results were verified by comparing with experimental results. The maximum residual stress at the repair weldment of cast iron sharply decreases by hammer peening. The effect of hammer peening on the residual stress increases with a decrease of working temperature of hammer peeing.

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도서관계 각 단체의 새해구상

  • 한국도서관협회
    • 도서관문화
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    • 제44권1호통권338호
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    • pp.4-13
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    • 2003
  • 최근 국내에서는 국가 정보문화의 기본 인프라인 도서관에 대한 인식제고가 언론계와 시민단체에 의해서 날로 그 힘을 얻고 있습니다. 또한 대외적으로는 전 세계 도서관인들의 축제인 국제도서관협회연맹(IFLA)의 2006 서울 대회 개최가 몇 년 앞으로 성큼 다가왔습니다. 올 한해는 우리의 도서관계가 국내외적으로 위상에 걸맞게 도약할 수 있는 매우 중요한 시기라고 생각합니다. 우리들 도서관인들의 힘과 슬기를 모아야 할 필요성이 증대되고 있는 지금, 우리도서관계 각 단체의 올 한해 각오와 사업방향 등을 알아보아야 한다.

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주철 보수용접부의 잔류응력 분포에 관한 연구 (A study on Residual Stress Distribution of a Repair Weldment of Casting)

  • 김현수;배상득;박윤기
    • 대한용접접합학회:학술대회논문집
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    • 대한용접접합학회 2003년도 추계학술발표대회 개요집
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    • pp.207-209
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    • 2003
  • In FE analysis for residual stress of a casting, contact force between mould and casting material and gravity force must be considered for exact simulation. Preheating of a repair weldment had a little effects on the reduction of residual stress. However, preheating with hammer peening had a great deal of effects on the reduction of residual stress. A method for estimation of fatigue life for a repair weldment has been established.

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생활습관 및 자세가 골반과 견갑골에 미치는 영향 (A Study of the Pelvic and the Scapular Level on the Life Habit and the Position)

  • 박윤기
    • The Journal of Korean Physical Therapy
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    • 제7권1호
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    • pp.69-73
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    • 1995
  • This research was performed to evaluate for the life style and the position of the pelvis and the scapular on the coronal plane among 78 students at the April, 7. 1995/ In this result the right scupular elevation was observed more 28 cases $(28\%)$ than the left scupular elevation, But the left pelvic tilt was observed more 38 cases $(48.7\%)$ than right pelvic tilt. There was no significant between the posture and the difference of scapular elevation and pelvic on the coronal plane.

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합금강의 응력집중 및 평균 응력에 따른 피로 특성 (Effects of Stress Concentration and Mean Stress on Fatigue Properties of Alloy Steels)

  • 김현수;박윤기;황주환;윤중근
    • 대한용접접합학회:학술대회논문집
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    • 대한용접접합학회 2005년도 춘계학술발표대회 개요집
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    • pp.115-117
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    • 2005
  • The purpose of this study is to establish the fatigue design criteria for the notched structural components subjected to high mean stress. In order to do it, the effects of stress concentration factor on the monotonic and cyclic tensile properties were investigated. Based on the results, two fatigue design approaches for the notched specimen using Goodman diagram was established and verified by comparing with the experimental result.

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