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吉鎔鉉 慶熙大學校 1979 論文集 Vol.9 No.-
The cultivated land of Korea (the South) occupies 22,400 ㎢ showing 22.4 percent of the total land. Considering present level of nutritive supply and agricultural productivity, the farming land requires 0.1 ha per head (worldwide average accounts for 0.4 ha), and our population reaching 36 million calls for 36,000 ㎢. Now the self-sufficient rate of provisions (foodstuff) is less than 75% and we have to import grains of the rest about 25% chiefly such as wheat, corn and soy bean, etc. For self-supply of this shortage, more than 10,000 ㎢ is necessary. The forthcoming increase of population and quality and quantity of foodstuff are expected to deepen serious lack of the agricultural land while the developing urbanization and industrialization bring about a concurrence of the land use. As the want of our farming land appears, the dependance on other industries will be enhanced ten to one. In this respect a phenomenon of free import must be faced and government leaders of countries that are short of provisions should cope with this difficult situation at any rate taking into consideration the possibility that foodstuff may be a fearful weapon. The self-sufficiency of foodstuff is absolutely necessary directly to our national security dimension. Agricultural products in Korea run short of international competitive power and many urge free import. Meanwhile many countries in the world have achieved their self-sustaining basis through modernization of agricultural technalogy and expansion of the tillable land, etc. Korea's prediction demand to agricultural utilization of land are varied owing to the increase of population, changes of industrial structure, foodstuff demand, scientific technology and agricultural productivity, etc., and the caculation variables and imput variables are influenced by the changes automatically. Accordingly the way to establish a comprehensive model may be proper theoretically but our absolute want of the tillable land requires the expansion of a farming land enhancement of its quality and the steps to prevent from encroachment of the land. The prospect of utilizing agricultural land enables us to presume a prediction of population and quantity of foodstuff consumption. Moreover the possibility of national territory's use and the demand prediction of the agricultural land could be made to realize self-sustaining foodstuff by estimating the potenciality of tillable land and the objective area for its qualitative progress. Now the tidal reclaimed land of Korea is estimated 4,010 ㎢ while tillable occupies 8,500 ㎢, and the objective area far irrigation works in order to make a qualitative progress of agricultural land is 2,800 ㎢ while the area able to arrange paddy field occupies 2,900 ㎢. Agricultural potential area owing to survey of land classification and soil shows 35,000 ㎢. The demand of our farming land in 2,000s is estimated 40,000 ㎢, and potential area for ace planting will be 10,000 ㎢. And other fields, vegetables, fruit trees, grains of special use. grass land, facilities of a farming basis and agricultural life are estimated 30,000 ㎢. Taking into consideration that Korean population will reach 60 million in 2,050, and that standard unit of nutrition according to prof. L.D. Stamp, the rice planting area requires 30,000 ㎢.
알루미늄 호일의 친수코팅 성능 개선에 관한 실험적 연구
김영생,길용현,박환영,윤백,김자수소,김병열 대한설비공학회 1999 설비공학 논문집 Vol.11 No.6
It is usual to use hydrophilic-coated aluminum foil for evaporator fin of air-conditioners to reduce air flow resistance caused by the water droplets condensed on the fin surface. The major effect of a hydrophilic coating is to reduce the contact angle of the condensate and prevent bridging of the condensate between the adjacent fins. The performance of hydrophilic coating generally tends to be degraded as it is used since the coating material is washed down by the condensate. In the present work, several types of hydrophilic coatings were evaluated in terms of durability of hydrophilicity, corrosion resistance and heat resistance. Results showed that an improved hydrophilic coating of resin type presented superb qualify in terms of durability and corrosion resistance while having almost the same level of qualify in heat resistance compared with the others.
웨이브 및 웨이브-슬릿 열전달촉진 휜-관 열교환기의 공기측 압력강하 및 열전달 특성에 관한 실험
윤백,길용현,박현연,유국철,김영생,Yoon, Baek,Gil, Yong-Hyun,Park, Hyun-Yeon,Yoo, Guk-Chul,Kim, Young-Saeng 대한설비공학회 1998 설비공학 논문집 Vol.10 No.5
Air side heat transfer and pressure drop for fin-tube heat exchanger with wave and wave-slit fins were measured for various fin spacings and number of tube rows. Outer diameter of the tube including fin collar is 10.07mm, and experiments were done with dry surface condition. Longitudinal and transverse tube spacings of the heat exchangers are 21.65mm and 25mm respectively, and wave depth of the wave fin is 2mm. Experiments were conducted for 1, 2 and 3 rows and 3 different fin spacings, 1.3, 1.5 and 1.7mm. An attempt was made to demonstrate advantage of the enhanced fins over the plane fin by introducing the concept of fan power, Effect of the number of tube rows on heat transfer was discussed in connection with general mechanisms of heat transfer enhancement for fin-tube heat exchanger. Also the effect of hydrophilic coating was investigated. Lastly, correlations for Colburn j-factor and friction factor were developed.
열전달 촉진 핀-관 열교환기의 공기측 압력강화 및 열전달 특성에 관한 실험
윤백,길용현,박현연,김영생,Youn, Baek,Kil, Yong Hyun,Park, Hyun Yeon,Kim, Young Saeng 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.11
Heat transfer and pressure drop for ${\phi}10.07$ dry surface fin-tube heat exchanger with wave and wave-slit fins were measured for different fin spacings and number of tube rows. Longitudinal and transverse tube spacings of the heat exchangers are 21.65mm and 25mm respectively, and wave depth of wave fin is 1.5mm. The experiments were performed for 4 different fin spacings, 1.3, 1.5, 1.7 and 2.0mm, and the number of tube rows were 1,2 and 3 rows. The present results were compared with the previous results for the wave depth of 2mm. Also hydrophilic coated and bare fins were tested. Correlations for Colburn j-factor and friction factor were developed.
글루콘산아연, 프럭토올리고당 및 생균제의 급여가 부로일러의 육성성적에 미치는 영향
고용균,유선균,길용현,신종서,오진석 강원대학교 동물생명과학연구소(구 강원대학교 동물자원공동연구소) 2005 동물자원연구 Vol.16 No.-
This study was carried out to compare the effect of dietary zinc gluconate, fructooligosaccharide and probiotic on body weight gain, feed intake and feed efficiency of broiler chicks. A feeding trial was conducted with a total of 216 broiler chicks. Each treatment had 18 chicks with 3 replications. The supplementation levels of each treatment in the experimental diets were 0.20% for zinc gluconate, fructooligosaccharide and probiotic, respectively. The body gain of chicks fed feed additives significantly increased (p<.05) compare with that of control. Especially, the treatment with probiotic produced higher body gain than other treatments. Average feed intake of chicks was not significantly different among treatments (p<.05). Feed efficiency of chick fed feed additives significantly (p<.05) improved compare with control and the highest in the probiotic treatment. Therefore, the feed efficiency of chicks fed fructooligosaccharide, zinc gluconate and probiotic treatment were increased by 3.5%, 4.0% and 4.5%, respectively compare to that of the control. In conclusion, dietary feed additives tended to slightly improve the body gain and feed efficiency. Especially the treatment with probiotic produced higher body gain and feed efficiency among other treatments.