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구조적 불연속에 기인하는 원통구조물의 응력집중현상에 관한 유한요소법에 의한 연구
김두만,정세헌 한국산업안전학회 1988 한국안전학회지 Vol.3 No.2
The stress concentration phenomena due to the structural incontinuty are studied by finite element method. In this study, a circular cylinder is treated. Under the axial load, the membrance action is dominate and the 24 D.O.F. cylindrical membrane finite element is used. The assembly of this element can successfully represent the original structure geometrically. The internal displacement function is such organized that the inter element compatibility condition is fully satisfied. In this study, the stress concentration factors due to the presence of a hole on the cylinder wall are obtained, and the factors versus the location of the hole is computed and plotted. It is found that the hole effect on the stress concentration disappears beyond the neighboring region of the hole size from the edge of the hole. Those results are useful for practical design in determining the region where the re-inforcing is necessary.
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기하학적 초기형상결함을 갖는 보강 원통의 충격좌굴 신뢰성 해석
김두기 한국소음진동공학회 1996 소음 진동 Vol.6 No.6
In this paper, buckling reliability analyses of stiffened cylinder with random initial geometric imperfection under axial impact load are performed by the combined response surface method. The effect of random geometric imperfection on the failure probability and reliability is recognized quantitatively. Buckling reliability decreases with the increase of mean value, cov of initial geometric imperfection under the same external load. Buckling probability under impact load is greater than those under static load with the same condition. From the probabilistic characteristics of imapct buckling load, relation between reliability index and safety parameter can be obtained in addition to the relation between load and reliability index. And those results can be used to determine the range of required safety parameter and acceptable imperfaction.
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김두기(DOO-KIE KIM),김동현(DONG-HYAWN KIM),장성규(SEONG-KYU CHANG),장상길(SANG-KIL CHANG) 한국해양공학회 2006 한국해양공학회지 Vol.20 No.5
A Probabilistic neural network (PNN) technique for predicting the stability number for the armor blocks of breakwaters is presented. A PNN is prepared using the experimental data of van der Meer and is then compared with the empirical formula and previous artificial neural network (ANN) model. This comparison shows that a PNN can effectively predict the stability numbers in spite of data complexity, incompleteness, and incoherence, and can be an effective tool for the designers of rubble mound breakwaters to support their decision process and to improve design efficiency.
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김두인,김광호 한국표면공학회 2009 한국표면공학회 학술발표회 초록집 Vol.2009 No.-
탐침현미경(Atomic Force Microscope)을 이용하여 탐침과 표면사이에 나노스케일의 접촉 반경을 가지는 접촉부를 만든 후 접촉부의 접촉 강성(contact stiffness)을 관찰하였다. 다양한 습도 조건하에서 접촉 강성의 변화를 측정한 결과, 습도에 의해 접촉부의 인장 거동이 달라짐을 확인할 수 있었으며, 습도 변화에 따라 인장 거동의 천이점이 존재함을 확인할 수 있었다.
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2019 누리과정과 2022 개정 초등통합교과에서 세계시민교육 내용의 계속성과 계열성 분석: 사회관계영역과 바른생활 중심으로
김두리(Duri Kim),김경언(Kyeong Eon Kim) 한국국제이해교육학회 2024 국제이해교육연구 Vol.19 No.2
본 연구는 2019 개정 누리과정과 2022 개정 초등통합교과 간의 연계성 중 계속성과 계열성을 중심으로 세계시민교육 내용을 분석하였다. 분석을 위해 2019 개정 누리과정의 사회관계 영역과 2022 개정 통합교과 바른생활에서 UNESCO(2015)세계시민교육 유아ㆍ초등 학습목표 내용을 추출하였고 선행연구를 참고하여 계열성과 계속성 분석 기준을 마련하였다. 분석 결과, 첫째 누리과정 사회관계영역에서는 사회정서적인 영역이 많이 분석됐고 초등 통합교과 바른생활에서는 누리과정에 비해 행동적 영역의 내용이 많이 도출되었다. 둘째, 사회관계영역과 바른생활의 세계시민교육내용은 교육과정내용상으로도 연결되는 내용들이 많았는데 주로 심화ㆍ확대의 형태를 보였다. 교육과정 상 비연계가 되는 부분도 확인해 볼 수 있었다. 이를 통해 향후 교육과정의 개정 시 두 교육과정안에서 내용상의 연결 뿐 만 아니라 세계시민교육의 근간인 사회성발달이 활발히 이루어지는 유아와 초등학교 저학년부터 세계시민교육의 연속성 있는 교육과정의 접근이 필요함을 시사한다. This study analyzes the continuity and sequence of global citizenship education in the 2019 Revised Nuri Curriculum and the 2022 Revised Elementary Integrated Curriculum. Focusing on the Social Relations domain in Nuri and the Disciplined Life domain in the Elementary Integrated Curriculum, the study draws on UNESCO's (2015) global citizenship education objectives. The analysis shows that the Nuri Curriculum emphasizes socio-emotional development, while the Elementary Curriculum focuses more on behavioral aspects. Despite some gaps, there is significant content continuity, indicating a need for more cohesive curriculum development to ensure consistent global citizenship education from early childhood through elementary school.
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축산환경 : 산사 및 마늘 분말이 한우암소의 이산화탄소 및 메탄 발생량에 미치는 영향
김두리 ( Du Ri Kim ),하재정 ( Jae Jung Ha ),송영한 ( Young Han Song ) 한국축산학회 2012 한국축산학회지 Vol.54 No.5
This study was conducted to investigate the effects of dietary garlic and may flower powder on CO2 and CH4 emission by Hanwoo cows fed TMR (Total Mixed Ration) based diet. Animals were housed in a hood-type respiration chamber and the environmental temperature was maintained at 20℃. Gases were measured for 24 hours using the multi-detector instrument gas monitoring system (Mamos-300, Australia). The treatments composed of groups with no intake of garlic and may flower powder (Control), with intake of garlic at 0.5% of DM (T1), with intake of garlic at 1% of DM (T2), with intake of may flower at 0.5% of DM (T3), with intake of may flower at 1% of DM (T4), with intake of garlic and may flower at 0.5% of DM (T5) and with intake of garlic and may flower at 1% of DM (T6). The results indicated that CO2 emission in T3 was 53% lower than that of control (p<0.05), and CH4 emissions was 57% lower than control (p<0.05). Also, the hourly pattern of CO2 and CH4 emissions in T3 showed the least difference with all treatments. Gas emissions pattern peaked after 1 hour of feeding and this gap was wider in the afternoon than in the morning hours.
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축산환경 : 급여수준에 따른 한우 암소의 온실가스 배출량 평가
김두리 ( Du Ri Kim ),하재정 ( Jae Jung Ha ),김종택 ( Jong Taek Kim ),송영한 ( Young Han Song ) 한국축산학회 2011 한국축산학회지 Vol.53 No.5
This study was conducted to investigate the effects of different feeding level of TDN(Total Digestible Nutrients) on the generation of main greenhouse gases such as carbon dioxide and methane in Hanwoo cows. The diet TDN(kg) adjusted to achieve ADG of 0g/day(Control), 200g/day(T1), and 400g/day(T2) of the maintenance level TMR(Total Mixed Ration) delivered twice a day at 08:30 and 17:30. Cow are housed in a respiration chamber and the environmental temperature was maintained at 20℃. The gases were measured for 24 hours using the multi-detector instrument Mamos-300. The analyzed methane emissions of T1 and T2 were 33.5% and 69.6% higher than control, respectively, and the carbon dioxide emissions were 21.1% and 40.6% higher than control. Also, the hourly pattern of carbon dioxide and methane production were showed very similar emission. Gas production showed peak after 1 hour of feeding and this gap was wider in the afternoon than in the morning hours. It is clearly conducted that CO2 and CH4 emissions were different by limited intake levels of feed.
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