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지열을 이용한 학교시설의 냉·난방시스템 효율성분석 -에너지 소비량을 중심으로-
박동순,이재림,Park, Dong-Soon,Lee, Jae-Rim 한국교육녹색환경연구원 2007 교육·녹색환경연구 Vol.6 No.2
This paper is focused on the economical efficiency of the geothermal heat pump system in school. As the importance of problems of environment and energy becomes larger, the development and distribution of energy-saving technology in the whole nation has become influential. This paper is intended, targeting on school buildings scattered all over the country, to evaluate the introduction and possibility of a terrestrial heat system which is in the first stage of introduction in the country, through energy consumption and efficiency in case where a terrestrial heat system is introduced. To do that, the author performed a qualitative analysis of the heat pump system using various terrestrial heat energy and the system introduced to existing school buildings and, through the analysis, made tentative evaluation on the most environment-friendly and energy saving type system. Also, the author performed simulation analysis using a currently typical school building standard and, on the basis of this result, conducted efficiency analysis of various heat pump systems. The conclusion according to synthetical analysis & evaluation can be summarized as follows. In case a heat pump system is introduced to a school building, it was deemed the investment in the early stage would increase, but the investment could be collected within 5~6 years through reduction of large operation expenses. Also, it was analyzed in case of terrestrial heat contracted heat mode using midnight electric power among heat pump systems, not only early investment but also operation expenses could be reduced to a great extent. Accordingly in case the system using terrestrial heat energy is applied to the school buildings that are to be newly built or repaired in the future, it will provide an object-lesson to students as well as contributing to energy saving.
박동순,정선부,박홍양 ( D . S . Park,S . B . Chung,H . Y . Park ) 한국축산학회 1987 한국축산학회지 Vol.29 No.1
This study was conducted to estimate the heritabilities, genetic, phenotypic and environmental correlations among litter size, body weight at birth. weaning, daily gain and survival rate in swine. The data analysed were estimated on the basis of 4802 litters produced from 487 boars of Yorkshire, Hampshire, Duroc and Landrace raised at Duck-Won farm in Inchon from 1983 to 1985. The results obtained are summarized as follows: 1. The least square means over all litters studied were 9.86±0.10 pigs at birth, 8.24±0.10 pigs at weaning. 2. The least square means of body weight over all litters studied were 1.446±0.01㎏ at birth, 7,068±0.057㎏ at weaning. 3. The least square means over all litters studied were 0.188㎏ in daily gain, 85.1% in survival rate. 4. The estimates of heritabilities of litter size at birth and weaning, pig weight at birth and weaning, daily gain and survival rate were 0.286, 0.170, 0.110, 0.158, 0.183, 0.119, respectively. 5. Genetic correlation between litter size at birth and at weaning was 0.544, between body weight at birth and at weaning was 0.183 and between daily gain and survival rate was 0.026. 6. Phenotypic correlation between litter size at birth and at weaning was 0.493, between body weight at birth and at weaning was 0.163, and between daily gain and survival rate was 0.117. 7. Environmental correlation between litter size at birth and at weaning was 0.491, between body weight at birthand at weaning was 0.250; and between daily gain and survival rate was -0.040.