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Pre-aging 처리에 따른 316 스테인레스강의 크리프성질에 관한 연구
김홍규,유연철 대한금속재료학회(대한금속학회) 1985 대한금속·재료학회지 Vol.23 No.12
The influence of pre-aging treatment on the creep properties in AISI 316 stainless steel has been investigated in the temperature range of 923∼1023 K and stresses in the range of 130∼228 MPa. Specimens were pre-aged at 1073K in air atmosphere up to 300 hours to clarity the effects of pre-aging time on creep rate. The steady state creep rate and the rupture strain increased with pre-aging treatment while the rupture time decreased with pre-aging treatment. Creep rate acceleration with pre-aging time could be described by ◎ =1.6686×10^(-4) t^(0.865) where t is the pre-aging time in seconds. Creep rate acceleration for pre-aged specimens was not strongly influenced by temperature and stress changes. Activation energy for creep decreased with pre-aging treatment and stress exponent represented by power relation increased with pre-aging time.
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김홍규,곽창섭 대한전기학회 2012 대한전기학회 학술대회 논문집 Vol.2012 No.4
초고압 가스 차단기의 차단성능 해석 시 압력상승 등의 유동특성 데이터가 필요하다. 본 연구에서는 차단기 유동해석 시간을 절감하기 위해서 OpenMP기법을 적용한다. 먼저 오일러 방정식을 유한체적법으로 이산화하여 직렬 코드를 작성 후, 병렬화 구간을 설정하여 OpenMP 기술을 적용하였다. 실험 결과 Core의 수가 증가하면 Amdahl의 법칙에 의해 50% 이상의 계산시간 단축이 되었다.
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김홍규 국어국문학회 2003 국어국문학 Vol.- No.134
We should not overlook the problems of the current research achievement evaluation system in Korean studies, which modeled after the evaluation systems popular in the field of natural science or the field of which fundamental researches rely on the academic achievements from abroad. Improper research achievement evaluation system causes distortion of research pattern and direction, and ultimately results in creation of deformed academia. We already see these phenomena in all the field of humanities. The efforts for fundamental works, necessary to the scholars themselves and the academic world became weakened; and the academic works with broad perspective and comprehensive structure disappeared. Scholars prefer to produce short articles with narrow view rather than go through with tedious and painful works, such as translation of or annotation on the original works. Unless we try to change these circumstances, the academic productivity will decrease, in spite of the increased number of articles. Considering the uniqueness of classical Korean literature study, we may suggest creation or reevaluation of the works from the following fields: 1. Philology on classical works. 2. Research and recording of orally handed down literary works. 3. Translation or annotation of classical works, and publication of research material collection. 4. Publication of dictionaries for technical terms in classical Korean literature and related field. The works described in the above are normally published in separate books rather than in journals. We may need more research on them until we establish criteria for them. However, to begin with, it is poignant to change our views and the existing evaluation system so that we can fully appreciate the importance of fundamental works, which properly reflect the characteristics of Korean studies as well as humanities in general and are vital in strengthening of academic foundation.
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