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이종헌,강건,배춘익,Lee, J.H.,Kang, K.,Bae, C.E. 한국마린엔지니어링학회 1999 한국마린엔지니어링학회지 Vol.23 No.5
A UBET program is developed for determining flash the optimum sizes of preform and initial billet in plane-strain closed-die forging. The program consists of forward and backward tracing processes. In the forward program, flash, die filling and forging load are predicted. In backward tracing process the optimum dimensions of initial billet and preform are determined from the final-shape data based on flash design. Experiments are carried out with pure plasticine billets ar room temperature. The theoretical predictions of forging load and flow pattern are in good agree-ment with the experimental results.
실린더해드 순간온도 측정에 있어서 실린더해드 벽표면에서 측정가능 깊이에 관한 실험적 연구
이재순(J.S.Lee),강태경(K.T.Kang),이현구(H.K.Lee),이종헌(J.H.Woo),이응래(E.L.Lee),정인곤(I.G.Jung),안병태(B.T.An) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
The instantaneous temperature probes and data acquisition system were developed for the measurement of cylinder wall surface temperature and the temperature at the inner part beneath the surface for the direct injection mono cylinder diesel engine. The instantaneous temperature at the inner part beneath the wall was both calculated theoretically and detected experimentally and then were compared each other. The results can be summarized as followings; 1) It is found that the measurable depth for the instantaneous temperature is 0.4mm. 2) When the depth beneath the surface was increased, the crank angles to the maximum temperature were increased and also there were the attenuation of maximum temperature, mean temperature, and temperature swing. 3) The variation of temperature swing is affected more by the temperature detection positions than by the engine speeds. 4) When the calculated temperature and detected temperature were compared, the temperature by the experiment is greater than by the calculation, it is believed that the poor cooling at the inner parts by flesh inlet air compared to the amount of cooling by flesh inlet air at the surface makes the experimental temperature to be higher than the calculation. 5) The correlation of surface temperature,the temperature of the inner parts with the engine spped and measurable depth are derived<br/>
섹터해석법을 이용한 환형반복구조물의 자유진동해석 프로그램
김동옥(D. O. Kim),이종헌(J. H. Lee),이인원(I. W. Lee) 한국강구조학회 1996 韓國鋼構造學會誌 Vol.8 No.1
Free vibration analysis program for rotationally periodic structures is coded. Many kind of structures have the form of rotationally periodic structure such as cooling tower of the nuclear power plant, large chimney, oil tank, natural gas tank and tire. The rotationally periodic structures can be divided into several substructures with the same form called the sector. Using this property, one can obtain natural frequencies and the corresponding mode shapes of the entire structure with information of only one sector as shown in Ref.[1,2]. It is programmed, called as sector method in this paper, and is added to ADINA the commercial FEM package. One can efficiently calculate the dynamic characteristics of the rotarionally periodic structure by using the modified program. The program can quickly give the accurate results with very small memory space of a computer. As an example to demonstrate the efficiency of the program, cooling tower of the nuclear power plant is considered.
하동우,김현철,김병우,이문연,이종헌,신철교,도창희,이정규 한국동물자원과학회 2002 한국축산학회지 Vol.44 No.6
1997년부터 2001년까지 (사)한국종축개량협회의 전국한우능력평가대회에 출품된 642두의 거세한우의 도축 전까지 4회에 걸쳐 주요 10개 부위의 체형 측정치를 조사하여 주성분 분석을 이용하여 체형을 분류하였으며, 각 체형 측정치의 주성분 지수와 도체 형질과의 상관관계를 분석하였으며, 그 결과를 요약하면 다음과 같다. 1. 1차, 2차, 3차 및 4차 체형 측정치의 principal component(이하 P.C) 1의 분산은 각각 7.610, 8.297, 7.269 및 5.736로서 전체분산 중 76.0%, 83.0%, 72.7% 및 57.4%를 나타낼 수 있었고, P.C 1, P.C 2, P.C 3의 합은 전체분산 중 각각 86.69%, 90.49%, 84.62% 및 77.26%를 나타났다. 2. 각 차수별 체형 측정치의 P.C 1의 모든 계수가 양(+)이어서 일반적으로 좋은 체구의 크기를 나타내었으며, 체구의 크기에 가장 크게 영향을 미치는 형질은 흉심(0.328∼0.339)과 요각폭(0.325∼0.341)이였다. 또한 P.C 2, P.C 3 및 P.C 4는 각 차수별로 다양하게 나타났다. 3. 1차, 2차, 3차 및 4차 체형 측정치의 주성분 지수들과 도체형질간의 상관계수 추정에서 대부분의 분산을 차지하는 P.C 1은 도체중(0.539∼0.755), 일당증체량(0.256∼0.564), 등지방두께(0.227∼0.280) 및 배최장근단면적(0.187∼0.344)간에 정(+)의 상관을 보였으며, 육량지수(-0.246∼-0.110)와는 부(-)의 상관을 보였고, 근내지방도(0.066∼0.099)와는 대부분 유의적인 상관을 보이지 않거나 낮은 상관을 보였고, P.C 2, P.C 3 및 P.C 4는 주성분 지수들의 값에 따라 도체형질과 다양한 상관관계를 보였다. 단일 체형형질과 도체형질간의 상관 그리고 P.C 1의 주성분 지수와 도체형질과의 상관간에는 큰 차이가 없었다. Data were consisted of the ten body measurements (withers height, rump height, body length, chest depth, chest width, rump width, rump length, thurls width, hipbone width and chest girth) of 642 steers (Korean cattle), which was entered in the National Beef Quality Contest hosted by the Korea Animal Improvement Association from 1997 to 2001. A principal components analysis was used to classify the body types of the steers, and estimate the correlations between carcass traits and principal components for the body measurements of the first, second, third and fourth period, respectively. The first principal component of body measurements at the first, second, third and fourth period accounted for 76.0%, 83.0%, 72.7% and 57.4% of the total variance, respectively. The sum of first, second and third principal component at each period accounted for 86.69%, 90.49%, 84.62% and 77.26% of the total variance, respectively. At each period, all the first principal component of the body measurements were positive and it generally showed large framed body shape. The size of body was influenced mostly by chest depth(0.328∼0.339) and rump length(0.325∼0.341). The second, third and fourth principal component at the each period were various. There were positive correlations between principal components index of each period and carcass traits such as carcass weight(0.539∼0.755), average daily gain(0.256∼0.564), backfat thickness(0.227∼0.280), and eye muscle area(0.187∼0.344). The correlation with yield grade index(-0.246∼-0.110), however, was negative. The correlation with marbling score(0.066∼0.099) was low or statistically insignificant. According to principal component indexes of the second, third, and fourth components, the correlations with the carcass traits were various. There were no large differences between the correlations of the single body measurement trait with the carcass traits and the correlations of the first principal component indexes with the carcass traits.
Estradiol이 수유백서의 혈청,골 및 자아의 방사성 Calcium 대사에 미치는 영향에 관한 연구
장윤석,박기복,나건영,박기복,이종헌 대한핵의학회 1968 핵의학 분자영상 Vol.2 No.1
수유중의 백서 12필을 사용하여, 그 중 6필에는 임신말기에 분비되는 양의 estrogen을 4일간, 45Ca와 같이 주사하고 제 5일에 혈청, 골 및 자아 전체의 방사능을 측정하였다. 6필에는 대조군으로서 사용하였다. 1) 양군의 자아의 평균 체중증가는 흡사하였다. 2) 혈청 및 골의 방사능은 estrogen 투여군이 대조군에 비하여 유의의하게 높았다. 3) 양군의 자아 전체의 방사능은 흡사하였다. 4) 이상의 실험성적으로서 estrogen은 동물에 있어서 calcium 침착에 큰 영향이 있다. The influence of estradiol on the radioactive calcium metabolism in blood, bone and young of lactating rats has been studied. Estrogen, in an amount estimated to equal that secreted in late pregnancy, was injected daily into lactating rats for 4 days along with 45Ca. On the 5th day, radioactivity of blood serum, bone, and young was compared to a similar group of lactating rats not treated with estrogen. Average gain in weight of the litters of the 2 groups was similar. However, radioactivity in serum and bones of treated with estradiol was significantly higher than in the controls. The radioactivity in litters of the 2 groups was similar. Estrogen plays a role in the retention of calcium in the animal body.