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〈논문〉 : 수치 시뮬레이션과 실험을 결합한 두께가 얇은 박막의 파괴 인성치를 구하는 방법
오세영(Oh Sei-Young),김현규(Kim Hyun-Gyu) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this study, we suggest a new method for evaluating the fracture toughness of thin films by combining numerical simulations and experimental tests. Images of propagating cracks in Cu thin films are taken by using microscope, and far-fields loadings are estimated inversely to reproduce crack opening shapes. A Cu thin film with an initial crack, which is attached on aluminum sheets, is extended by a tensile tester. The energy release rate for crack growth is computed by conservation integral techniques in finite element analyses. As a result, the present method can evaluate the fracture toughness of thin films easily, and can be used for many industrial applications.
간호대학생의 학년 진급에 따른 자아존중감과 리더십의 변화
오세영(Oh, Sei-Young),박선남(Park, Sun-Nam) 한국간호교육학회 2010 한국간호교육학회지 Vol.16 No.2
Purpose: The purpose of this study was to identify the changes of self-esteem and leadership scores in nursing students during two years. Method: The subjects were 233 nursing students in their first year in 2007, and 257 in their third year in 2009. Data were collected 2 times for the same subjects, in 2007 and 2009 respectively, with the same structured questionnaires. Result: Satisfaction for major and interpersonal relationships of nursing students was significantly increased in the third year over the first year. Self-esteem and leadership scores were significantly increased in the third year over the first year (t=5.48, p<.001, t=5.63, p<.001). Self-esteem and leadership scores increased significantly according to satisfaction degree, interpersonal relationship and year. Self-esteem was positively related to leadership (r=.50, p<.001). Conclusion: The result of this study may show the increase in self-esteem and leadership of nursing students relevant with their year of nursing. This finding suggests the importance of satisfaction and interpersonal relationships to increase self-esteem and leadership.
전자뇌관과 미진동폭약을 활용한 보안물건 초근접 구간에서의 터널발파공법 적용에 관한 연구
오세영 ( Sei Young Oh ),이천식 ( Chun Sik Lee ),이기근 ( Ki Keun Lee ),이동희 ( Dong Hee Lee ),이승재 ( Seung Jae Lee ),박종호 ( Jong Ho Park ) 대한화약발파공학회 2017 화약발파 Vol.35 No.4
Due to civil complaints on vibrations and noises arising from blasting, mechanical excavation has been widely used for tunneling rather than the method of blasting, especially in the case of being in a close-proximity of 10M-20M range to a safety-thing. However, mechanical excavation, though less, it does increase the cost of whole construction project as the period of excavation is much prolonged from lack of constructability. This study aims to research and develop an effective blasting method that can ensure the constructability of shortened excavation period whilst not compromising the safety of the safety-things in a proximity to the blasting site by using a combination of an electronic detonator that can accurately control its delay period and a Low Vibration Explosives(LoVEX) that is effective on vibration control.