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Cytodex 1을 이용한 Microcarrier 배양법에서의 세포의 증식성 조사
김재홍,이영옥,박봉균,남궁선,최정옥,Kim, Jai-hong,Ree, Young-ok,Park, Bong-kyun,Namgoong, Sun,Choi, Chung-ok 대한수의학회 1986 大韓獸醫學會誌 Vol.26 No.2
Microcarrier culture technics are widely used for the massive production of the vertebrate animal cells. In this study, attempt was made to establish the microcarrier cell culture system using Cytodex. Various factors affecting the growth of cells on microcarrier culture were also discussed. In conclusion, the yield of cells in microcarrier culture was several times greater than those in roller bottle and flask culture methods, based on the volume of culture media.
자본주의(資本主義) 정신(精神)과 농지개혁(農地改革)에 관(關)한 연구(硏究)
김재홍,Kim, Jai Hong 충남대학교 농업과학연구소 1982 Korean Journal of Agricultural Science Vol.9 No.1
Land reform was performed in most under-developed countries after liberation from colonialism. In Griffin's thesis, the objectives of the land reform were classified in to three categories based on their ideology. Under capitalist ideology, emphasis was placed on the property ownership, so there has been existed large farms and various tenancy systems. But in this study the characteristics of capitalism was defined as deligence and thrift, and parity exchange. Land reform, tenants must have their own land, is the basic solution to support these characteristics.
자작농(自作農)과 소작농(小作農)의 경영성과(經營成果) 비교(比較) -충남지역(忠南地域) 현금수지분석(現金收支分析)-
김재홍,Kim, Jai Hong 충남대학교 농업과학연구소 1986 Korean Journal of Agricultural Science Vol.13 No.2
This paper aims at identifying the positive economic effects of the tenant system. Increasing numbers of tenant farms is one of the characteristic aspects of Korean agriculture. They have increased 3.7 percent annually since 1960. At the end of 1985, 64.7 percent of the Korean farmers leased partly or entirely the farm land which they managed, and 30.5 percent of the total arable area was cultivated under the tenant system. To find out the difference in performance of management between land owners and tenants, 600 farm households were selected as samples throughout Chungnam province. Among those sampled were 300 land owners and 300 tenants. Tenants defined this paper include not only full tenants but also part tenants. The results of this study are summarized as; First, rice is the main income resource of tenant farms. Due to their rental charges, the marketable surplus of farm products might be lower than that of land owners. Whereas 40 percent of the landowners income is from rice production, the tenants income from rice production is 43 percent. Second, tenants continue to depend on more agricultural wage incoms and more double crop incomes in paddy fields than land owners. Third, like most poor people in the third world, they have maximized their incomes and minimized their expenditures by saving management costs. Finally, there was no interlinking between landlords and tenants especially related to credit supports. Most farmers in the surveyed area have met their credit requirements from agricultural cooperatives.
소작경영(小作經營)이 농업생산성(農業生塵性)에 미치는 영향(影響)에 관(關)한 연구(硏究)
김재홍,유경남,Kim, Jai Hong,You, Gyeung Nam 충남대학교 농업과학연구소 1988 Korean Journal of Agricultural Science Vol.15 No.2
Land reform in Korea was performed in 1949. The formation of owner farmers was the primary objective of land reform. But since land reform, the number of tenants has been increasing, and it reached to 65.7% of total farmhousehold by 1985. To analyze the productivity of tenant farming, 40 farmers in Kumnam, Yeongi Gun and Gongju Gun, Banpo, Chungnam Province, were selected as samples for the empirical analysis. The results of the empirical analysis are summarized as follows; 1. In plain area, tenants input 5% more labor, and 15% less capital than owner farmers. In mountain area, tenants input 15% more labor, and 4% more capital than owner farmers. 2. There is no difference in the output of rice between owner farmers and tenants in both area. 3. In plain area, the physical productivity of labor of owner farmers is 4.6 (kg/hour), and that of tenants is 4.4. And the physical productivity of labor of owner farmers in mountain area is 4.2, and that of tenants is 3.6. 4. The physical productivity of capital of owner farmers in plain area is 17.7(kg/1,000 won), and that of tenants is 20.6. In mountain area, the physical productivity of capital of owner farmers is 18.8, and that of tenants is 17.9.
농가소득(農家所得) 측면(側面)에서 본 소작농가(小作農家)의 성격(性格)에 관한 실증적(實證的) 연구(硏究)
김재홍,Kim, Jai Hong 충남대학교 농업과학연구소 1988 Korean Journal of Agricultural Science Vol.15 No.1
This paper aims to identify the characteristics of the tenant farm's income compared with farm household consumption. Farm household surplus is a critical criteria for the reproduction of agriculture. The degree of self sufficiency of farm household consumption according to agricultural income was rapidly decreasing for the period of 1980's. Only 78.9 percents of farm household consumption was earned by agricultural income. Tenant farms were classified according to the following characteristics; self-supported, semi self-supported, leased, deleted, over-consumption. Self-supported tenants are one of the backbones of Korea's future agriculture, because they are able to meet their household needs by only their farm work without other income producing endeavors. The rent paid by those tenants surveyed was estimated at 26.2 percents of their farm household income. However, the national average for such rental payment is equivalent to 4.7 percents of farm household income. 63 percents of paddy rental fee was paid by inkind of rice and 80 percents of the upland rental fee was paid by cash. Self-supported farms as 20 percents of total surveyed should be the target of agricultural price policy and semi self-supported & over-consumption farms as 30 percents be that of rural development policy, and the other half be that of social welfare policy.
불확실성하(不確實性下)의 영농의사결정(營農意思決定)에 관한 연구(硏究)
김재홍,김희성,Kim, Jai Hong,Kim, Hee Sung 충남대학교 농업과학연구소 1988 Korean Journal of Agricultural Science Vol.15 No.2
This paper aims to identify the farmers decision making under uncertainty. Qiuite a few studies have been done on the farmers decision making without uncertainty, but few studies have been made to see farmers decision making under uncertainty in Korea. There are many ways to avoid risks or uncertainty, Wald, Savage, Hurwicz, Laplace, Agrawl-Heady etc. are studied in this field. Fourty farmers were selected as samples. Among those half are the suburbs, and the other half are rural farmers. The results of this study are summarized as follows; First, the suburb farmers are more profit pursuit farmers. Second, not only the rural farmers but the suburb farmers are concerned more safety rather than output maximization. Third, the subsistence farmers and semi-commercial farmers are decided by Wald criterion, but the commercial farmers are decided by Savage or Laplace criterion. Fourth, information is very important in farmers decision making, but the creditability is far from satisfactory to the farmers.
충남지역(忠南地域) 소작농가(小作農家)의 계급적(階級的) 성격(性格)에 관(關)한 연구(硏究)
김재홍,Kim, Jai Hong 충남대학교 농업과학연구소 1987 Korean Journal of Agricultural Science Vol.14 No.2
This paper aims to identify the class characteristics of tenants. To this end Patnaik's model is selected, because this model is most reasonable for sorting class structures of tenants. In his Model, "labor-exploitation criterion" is the main criterion for identifying class status. According to this criterion, there are five rural classes i.e. landlord, rich peasant, middle peasant, poor peasant, and full-time laborer. "Net labor ratio" is used for this purpose as empirical data handling. Net labor ratio is a ratio of net labor hired in to family labor, if hired in labor is more then this ratio is positive, and if hired out labor is more then the ratio is negative. Hired in and hired out labor includes not only direct labor but indirect labor such as labor employment or sales through rent. The results of this study are summarized as First, almost all tenants and owner cultivators are of the middle peasant class. Second, there are no rich peasant among the tenants, but 5% of owner cultivators are rich peasants, and 10% of tenants are poor peasants, owner cultivators are 1%. Third, the net: labor ratio of tenants is -0.211, and that of owners is 0.143. There are differences between tenants and owner cultivators even if land is much the same, and owner cultivators net labor ratio is positive except in the land size of 0.3-0.5ha, but that of the tenants' is negative. Fourth, proto-labor poor peasants earned 25% of income from labor, compared with under 10% of proto-tenant poor passant's. Rent to income ratio is almost 60% of proto-tenant, 27% of proto-labor among poor peasants.
김재홍(Jai-hong Kim),이병인(Byoung In Lee),이상철(Sang Cheol Lee) 충남대학교 농업과학연구소 2010 농업과학연구 Vol.37 No.1
This study analyzed the income of large scale honey bee farming of Korea. Using a questionnaire, 44 large scale honey bee farming farmhouseholds were surveyed. The average hive sizes are 258. The results are as follows. First, gross receipts of bee farming farmhouseholds are 50,342 thousand won, and it's components are honey 71%, bee selling and/or lent 26%. Second, working expenses are 23,778 thousand won that is 47% of gross receipts. Feed costs are 38.2%, material costs are 23.9%, hired labor costs are 11.0%, moving costs are 10.1%. Finally, receipts per hive are 195.1 thousand won, working expenses per hive are 23,778 thousand won, so income per hive is 103.0 thousand won.