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류선무(Ryusunmoo),김성기(Kimsunggi),박영일(Parkyoungil),류희중(Ryuheejung) 한국농어촌관광학회 2002 농어촌관광연구 Vol.9 No.1
This study has aims as follow: to renew our perception of the importance of farm village in order to activate rural areas; to understand the function and role of agricultural circumstances; to make clear the background from which Green Tourism has appeared and the relation of Green Tourism with national life; to elicit how to use land systeqlatically, how to secure stable income If rural areas and activate these areas, how to make comfortable living environment, how to make multilayered public function in rural areas, how to define agriculture as the sixth industry and how to present the ways to administer agriculture from several perspectives.<br/> <br/>
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HERITABILITIES AND GENETIC CORRELATION BETWEEN WEANING WEIGHT AND POSTEWANING GAIN IN SWINE
Park, Young Il 서울대학교 1967 서울대학교 論文集 Vol.18 No.-
돼지의 離乳時體重과 離乳後 增體量의 遺傳力과 遺傳相關係數를 分散分析과 共分散分析法을 통해 計算하고 選擇에 依한 이 두 經濟的 形質의 改良方法에 對해 考察하였다. 本硏究는 美國 Iowa 州立大學 附屬實驗牧場에서 1960年부터 1963年사이에 飼育된 Duroc과 Hampshire種돼지 4819 마리에 對한 資料를 根據로 하여 이루어졌다. 生後 42日에 測定한 離乳時仔隊體重의 遺傳力은 9%이었고 生後 42日부터 154日까지의 期間에 걸친 離乳後 增體量의 遺傳力은 24%이었다. 離乳時體重과 離乳後 增體量 사이의 遺傳相關係數는 0.48이었고 表現相關係數는 0.46이었다. 本硏究에서 얻은 結果로 미루어 볼 때 離乳後 增體量에 對해 選擇할 경우 選擇된 形質뿐 아니라 離乳時體重도 同時에 變化될 것으로 期待되는바 이때 期待되는 離乳時體重의 遺傳的 改良量은 이 形質에 對해 直接選擇함으로써 얻을 수 있는 改良量의 遺傳的 80%의 程度로 推算된다. 그러나 離乳時體重에 對한 選擇에 依하여 얻을 수 있는 離乳後 增體量의 傳統的 改良量은 離乳後 增體量에 對해 直接 選擇하는 경우에 比해 단지 30% 程度밖에 期待할 수 없는 것으로 推算된다. Heritabilities and genetic correlation between weaning weight and postweaning gain from 42 to 154 days of age were estimated from paternal half-sib analysis using data from 4819 pigs of the duroc and Hampshire breeds raised at the Bilsland Memorial Farm near madrid, Iowa from the spring of 1960 through the fall of 1963. Heritability estimates were 0.09 for weaning weight at 42 days of age and 0.24 for postweaning gain. Genetic and phenotypic correlations between the two traits were 0.48 and 0.46 respectively. Based on the result obtained in the present study, it was suggested that indirect selection for postweaning gain on the basis of weaning weight would be about 30 percent as effective as direct selection for postweaning gain, and indirect selection for weaning weight on the basis of postweaning gain would be about 80 percent as effective as direct selection for weaning weight. Acknowledgments This paper is based on a portion of the data used for a thesis submitted by the author to the Graduate School of Iowa State University in partial fulfilment of the requirement for the degree of Doctor of Philosophy. the author expresses his appreciation to Drs. J.L. Lush and L.N. Hazel of Iowa State University.
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STATISTICAL ANALYSIS OF AN R×2^2 TABLE WITH DISPROPORTIONATE SUBCLASS NUMBERS
Park, Young Il 서울대학교 1968 서울대학교 論文集 Vol.19 No.-
2^2要因實驗의 네處理組合을 R개의 Block에서 比較하면 R×2^2의 Table로된 Data를 얻게되는데 Subclass의 度數가 比例的이 아닌 경우 이 Data의 統計分析法에 關하여 硏究하였다. 두 개의 主效果와 두 要因間交互作用의 推定置는 각 Blook내에서 推定된 主效果와 交互作用을 加重平均할 때 가장 작은 分散을 갖게된다. 이때에 Weight의 크기는 Block의 情報量과 正比例的이어야 한다. 만약 Block과 要因의 效果사이에 交互作用이 있고 Weight의 크기가 Block에따라 다를때에는 두 主效果와 交互作用의 加重平均이 不偏推定置가 되지 못할수있으나 加重平均대신 單純平均을 쓰면 不便推定置가 된다. 加重平均과 單純平均에 의한 두 主效果와 交互作用의 指定置의 分散을 計算하는 公式도 아울러 誘導하였다. A statistical method of analyzing an R×2^2 table with disproportionate subclass numbers was devised. The minimum variance estimators of the two main effects and the 2-factor interaction were obtained by pooling the individual estimates within block weighted by the amount of information. The weighted estimates of the main effects and interaction may be biased, if the interactions involving blocks are not negligible and the weight given to each block varies from block to block. When the interactions involving blocks are significant, the unbiased estimates of the two main effects and interaction can be obtained from the unweighted average of the individual estimates within block. The expressions for the sampling variance of the weighted and unweighted estimates of the main effects and interaction were also derived.
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The Effect of Mixing within a Stirred Tank
Park, Young-Il 충남대학교 대학원 1977 論文集 Vol.8 No.-
本 硏究는 Strred Tank 內에서의 impeller速度 및 溶液內의 各部分에 따른 混合 效果를 實驗에 依하여 考察하였다. 混合은 impeller에 依한 動水力學的인 效果와 擴散效業에 의해 이루어 지므로 Stirred Tank內 에서의 各部分의 混合度가 달라 反應速度가 均一하지 못하여 混合度에 따르는 反應程度를 追定하기 爲한 가장 適切한 Sampling의 位置를 定하여 보았다. 反應物質로는 反應速度가 빠른 HCl과 NH₄OH, 反應速度가 느린 CH₃COOC₂H_(5)와 NaOH를 取해 實驗한 詰果 impeller 速度와 溶液內의 各部分의 反應速度間의 關係는 理論的인 結果와 一致되었다. This study aims to examine the effects of impeller speed on mixing state of locations within a stirred tank through the experiment. Mixing occurs as the result of impeller driven hydrodynamic and diffusional effects. Degrees of local mixing within a stirred tank are not uniform and reactions proceed at different rates at different locations. Proper locations for sampling were determined so as to measure degree of reaction which is degree of mixing dependent. As the result of experiment between HCl and NH₄OH, whose reaction rate is fast and CH₃COOC₂H₃ and NaOH, whose reaction rate is slow, effects of interactions between impeller speed and reaction rape at locations in solution resembled the theoretical results.
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