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[論文] 경계요소법에 의한 터보과급 가솔린기관 실린더블럭의 열전도 해석
김은태(E. T. Kim),최영돈(Y. D. Choi),홍진관(J. K. Hong) 한국자동차공학회 1989 오토저널 Vol.11 No.2
In this study, steady state heat conduction problems of the cylinder block of turbocharged gasoline engine were solver by the boundary element method.Surface of the cylinder block was devided by the triangular cells with constant potential.<br/> Temperature distribution, effective heat transfer coefficient of the cylinder block were investigated with variation of equivalence ratio, engine speed and boost pressure.<br/> The results show that maximum temperature of cylinder block increase rapidly with increas-inhomogeneity of inner wall temperature at the high engine speed and boost pressure.
논문 : 생물생산시설 및 환경공학 ; 태양열을 이용한 시설재배 지중변온가온의 토양 온도특성 연구(3) -지중변온가온의 재배실용화 실증시험-
김진현 ( J. H. Kim ),김태욱 ( T. W. Kim ),송재관 ( J. K. Song ),나규동 ( K. D. Nah ),하유신 ( Y. S. Ha ),김태수 ( T. S. Kim ),김은태 ( E. T. Kim ) 한국농업기계학회 2011 바이오시스템공학 Vol.36 No.3
According to the result of the first report and the second report of this study, it was expected that soil heating in a protected cultivation in winter season would affect the initial growth and development of fruit. Based on the result of previous study, we compared height, leaf number, leaf area, fruit weight, crop growth rate (CGR), features and quantity of cucumber for 3 months after planting between the soil heating group and the non-heating group. The result were summarized as follows: The height, leaf number, leaf area and fruit weight of cucumber in the soil heating group were 12.5%, 14.6%, 21.4% and 22.8% higher, respectively, compared to those of cucumber in the non-heating group. Although both the soil heating group and the non-heating group similarly showed an increasing pattern in CGR after transplanting, the soil heating group showed the increased CGR by 12.1% compared to that of the non-heating group. The quantity of cucumber in the soil heating group was about 26% higher than that of the non-heating group. It is assumed that the activation of initial growth and development of fruit in the heating group resulted in the increase of quantity.