• Korean Journal of Soil Science and Fertilizer
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• v.46 no.6
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• pp.409-416
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• 2013

Millet and sorghum are major dryland cereal crops, however their growth and productivity is limited by soil water stress with varying intensity. The major objective of this study was to evaluate water stress of millet and sorghum yield under drainage classes of poorly drained soil and to test the effect of the installed pipe drainage in poorly drained paddy soil to minimize crop stress. The research was carried out in poorly drained paddy fields located at alluvial slopping area resulting in non-uniform water content distribution by the inflow of ground water from the upper part of the field. Stress Day Index (SDI) was determined from a stress day factor (SD) and a crop susceptibility factor (CS). SD is a degree of measurement by calculating the daily sum of excess water in the profile above 30cm soil depth ($SEW_{30}$). CS depends on a given excess water on crop stage. The results showed that sum of excess water day ($SWD_{30}$) used to represent the moisture stress index was lower on somewhat poorly drained soil compared with poorly drained soil on 117 days. CS values for sorghum were 57% on $3^{rd}$ leaf stage, 44% on $5^{th}$ leaf stage, 37% on panicle initiation, 23% on boot stage, and 16% on soft dough stage. For proso millet CS values were 84% on $3^{rd}$ leaf stage, 70% on $5^{th}$ leaf Stage, 65% on panicle initiation, 53% on boot stage, and 28% on soft dough stage. And for foxtail millet the values were 73% on $3^{rd}$ leaf stage, 61% on $5^{th}$ leaf stage, 50% on panicle initiation, 29% on boot stage, and 15% on soft dough stage. SDI of sorghum and millet was more susceptible to excess soil water during panicle initation stage more poorly drained soil than somewhat poorly drained soil. Grain yield was reduced especially in proso millet and Foxtail millet compared to Sorghum.

• Journal of the Korean Society of School Health
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• v.8 no.2
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• pp.277-291
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• 1995

The study was designed to grasp the mental health of junior college students and identify the relation between mental health and social support. The subjects for this study were 781 sophomores attending T junior college in Taegu. The data were collected through questionnaire during the period from september 10,1993 to september 24, 1993. The results of this can be summarized as follows: In mental health the average mark was 1.94 on the basis of 5 marks. Those whose mark was more than 75% (low) had Depression(8.7%),Obsessive compulsive reaction(5.2%) Anxiety(3.6%). In social support, the average mark was 3.03 on the basis of 4 marks, which showed comparatively high support; relationship with friends was 75.4%, companionship was 75.4%, and mutual understanding was 72.3%. Many students got more than 75% in total marks. In the state of mental health, there was a significant difference depending on sex, total income, the character and the attitude toward his parents. There is also an unusual difference in social support depending on the major subjects, the character, the problem at present and the attitude toward his parents. In mental health, both male and female students got higher marks in Depression, Obsessive compulsive reaction than in any other item. In social support level all students had a high support in the relationship with friends and mutual understanding. Those who are affectionate to and dependent on their parents had a tendency to have better mental health. The simple correlation modules between social support mark and mental health one was -0.5555 and the partial correlation modules of controlling sex, age, growth place was -0.5557. There was little difference between them. In mental health items Interpersonal sensitivity was highest correlated with social support and Somatinization was lowest correlated. There was a significant correlation between mental health and social support: the higher social support were, the better mental health was. In conclusion, the study showed that the relationship between the social support and the mental health level revealed a significant correlation. In social support Expressive support (companionship support, mutual understanding support) showed a higher degree of support than instrumental support(monetary support, demand support). Therefore, in the guidance of students, it is necessary to expand expressive support considering these respects. Further multidimensional study is needed on how to improve the mental health of junior students through the social support.

• Journal of Ginseng Research
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• v.28 no.4
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• pp.191-195
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• 2004

An investigation was conducted to ascertain the basic information on characteristics of embryonic tissue development among Korean Ginseng, American ginseng, $F_{1}$ hybrids and $BC_{1}F_{1}(F_{1}$ pollen back cross to $BC_{1}=Korean\;Ginseng)seeds$. The specific activities of lipoxygenase (LOX) and the protein assays were made during the above embry­onic growth period at 5 or 25 degree C. The results are summarized as follows: The fresh weights(mg) of germinating seeds were significantly different among species. Ginseng seeds were stratified at $5^{\circ}C\;for\;60\;days$ the ratios of embryo/endosperms in $P.g.,\;P.q\;or\;F_{1}\;were\;about\;90{\%}$. The ratio was in $BC_{1}F_{1},\;79.2{\%}$ during the same period. The ratios of embryo/endosperms of seeds of P.g. or P.q. germinated at $5^{\circ}C$ showed rather higher values as compared to that at $25^{\circ}C$ LOX specific activity the highest in the $F_{1}$ and decreased in the order of P.g., P.q., and $BC_{1}F_{1}$. The highest LOX specific activity was shown at 80 days after sowing, followed by 70 days sowing, the least LOX activity was shown at 60 days.

• Journal of Digital Convergence
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• v.15 no.6
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• pp.1-8
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• 2017

This study examined the factors influencing foreign direct investment(FDI) in OECD countries where Korea is a target country. The differences in the cultural distances of host and home countries and the difference in the perceptions of corruption have been used to identify the factors affecting foreign direct investment. As a result of the study, it was found that there are differences in foreign direct investment according to cultural dimension and corruption perceptions index. Foreign direct investment may increase or decrease depending on the cultural tendency and the higher the perceptions of corruption, the more active the investment. The smaller the power distance between host country and home country in the factors affecting foreign direct investment, the larger the number of investments and the larger the size of individualism versus collectivism. Foreign direct investment increased when the investing country's corruption perceptions index was high. The results of this study confirm that cultural and corruption perceptions can affect trade transactions. Therefore, it is necessary to consider the cultural tendency and the cultural distance in the trade transaction by confirming that the degree of culture and corruption perceptions can affect the trade transaction. And that it can influence trade and economic growth by appropriately managing social variables such as public corruption.

• Journal of Bio-Environment Control
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• v.23 no.1
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• pp.39-42
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• 2014

The objective of this study was to estimate cardinal temperatures for germination of lettuce (Lactuca sativar L.) using bilinear, parabolic, and beta distribution functions. Seeds of lettuce were germinated in a growth chamber at 7 constant temperatures: 10, 14, 16, 20, 24, 28, and $32^{\circ}C$. Four replicates of 100 seeds were placed on two layers of filter paper in a 9 cm petri-dish. Radicle emergence of 1 mm was scored as germination. The time course of germination was modeled using a logistic function. These minimum, optimum, and maximum temperatures were estimated by regression of the inverse of time to 50% germination rate against the temperature gradient. In bilinear function, minimum, optimum, and maximum temperatures were $7.9^{\circ}C$, $23.3^{\circ}C$, and $28.0^{\circ}C$, respectively. In parabolic function, minimum, optimum, and maximum temperatures were $9.7^{\circ}C$, $19.5^{\circ}C$, and $29.4^{\circ}C$, respectively. In beta distribution function, minimum, optimum, and maximum temperatures were $3.7^{\circ}C$, $20.7^{\circ}C$ and $32.0^{\circ}C$, respectively. Minimum, optimum, and maximum ranges of temperatures were $3.7{\sim}9.7^{\circ}C$, $19.5{\sim}23.3^{\circ}C$, and $28.0{\sim}32.0^{\circ}C$, respectively.

• Journal of the Korean Society of Food Science and Nutrition
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• v.20 no.4
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• pp.320-328
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• 1991

The present study was designed to evaluate the effects of dietary vitamin E and coenzyme $Q_{10}$ supplementation on adriamycin (ADR) -induced lipid petoxidation in rats. After feeding the experimental diets for e weeks. Ann treatment significantly decreased growth performance of rats. But this decrement was not modified by supplementation of vitamin E or coenzyme $Q_{10}$ . Lipid peroxide values of plasma and heart mitochondria were elevated by Ann treatment. But these values were significantly decreased according to vitamin E or coenzyme $Q_{10}$ supplementation. Adriamycin treatment elevated glutathione peroxidase (GSH-Px) activity of rats, but this increment was modified by vitamin E supplementation. There was a tendency of higher superoxide dismutase (SOD) activity in ADR-treated rats. However, vitamin E or coenzyme $Q_{10}$ administration reduced this enzyme activity. With ADR treatment, arachidonic acid (20 : 4) was greatly increased, but docosahexaenoic acid (22 : 6) was not detected. Arachidonic acid was decreased and docosahexaenoic acid increased by supplementation of higher level of vitamin E or coenzyme $Q_{10}$ . Present data showed that dietary vitamin E and coenzyme $Q_{10}$ influenced on ADR-induced lipid peroxidation in rats, and also the degree of antioxidative effect was greater in vitamin E-supplemented rats.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.42 no.2
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• pp.189-195
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• 1997

To cope with increasing importance of water stress in food crop production, characteristics and cultivar differences in physiological responses of winter barley plants to water stress during seedling stage were studied employing three covered-barley, Milyang 12, Durubori, and Olbori, one naked-barley, Baekdong, and one two-row beer-barley, Hyangmaeg. Water stress was given to barley plants by withholding watering in soil-culture pots or by adding P.E.G. (polyethylene glycol, M. W. 4,000) to the nutrient culture solution. When water stress was imposed by withholding watering for 10 days to the seedlings grown in pot-soil for 10 days after emergence, leaf water potential of 5 cultivars was decreased almost to the same degree, from control -3.5 bar to the water stressed -26.6 bar. However, growth and some physiological responses were differently affected by cultivars: The plant height was decreased by 16-26％ : seedling dry weight by 25∼42％ ; chlorophyll content by 21∼39％ ; second leaf survival rate by 8∼18％ ; and free proline content per gram of leaf dry weight was increased from control 0.2∼0.5mg to the water stressed 5.8∼13.2mg. Drought resistances of 5 barley cultivars, based on the leaf survival rate and the decreased rate in seedling dry weight at the end of stress treatment, were high in the order of 3 covered-barley＞naked-barley＞two-row barley.

• 대한공업교육학회지
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• v.45 no.1
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• pp.84-102
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• 2020

During the period of rapid industrial growth, specialized high schools were important vocational education institutions trained specialists and technicians. But now, specialized high schools turned into high schools where the low-ranking students who were pushed out of the competition for admission due to a decline in the education population, changes mostly in labor demand in the labor market, and discrimination against skilled workers. In order to solve this problem, the middle school 3rd grade teachers in charge of the middle school can provide early career guidance, so that they can decide to go to the specialized high school according to their aptitude and talent rather than their grades. The purpose of this study is to investigate the relationship between general characteristics and perception of middle school 3rd grade teachers, and the rate of decision to enter specialized high school. In 2018, The middle school 3rd grade teachers in charge in Daejeon metropolitan city were selected. The results of this study were as follows: When 3rd grade teachers in charge are the male teachers 21.01%(M=.2101) of their students go to specialized high schools. When they are teachers who have not graduated from college of education(M=.2110), with doctoral degree(M=0.3064), of their students go to specialized hight schools. Finally, there was a significant positive relationship between perceptions of high school teachers (β1 = .245, p = .000) and high school graduates (β2 = .149, p = .027). The regression equation derived from this is y = -0.56 + 0.037 * β1 + 0.025 * β2 10.1% (R² = 0.101).

• Journal of The Korean Society of Integrative Medicine
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• v.7 no.2
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• pp.111-119
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• 2019

Purpose : The aim of this study was to investigate patterns of medical use among juveniles and adolescents, including for chronic disease, in Korea. The study sought to do the following: (a) investigate the extent to which chronic diseases account for medical expenditures, (b) investigate and the socio-demographic characteristics associated with medical use, and (c) identify the differences in medical use between juveniles and adolescents. Methods : We used data from the 2015 Korean Health Panel and selected 12 variables. The socio-demographic characteristics investigated included, growth period (juvenile, adolescents), gender, family income, national basic livelihood act status, disability registration, and degree of disability. There were five medical factors that were considered: emergency room use, hospitalization use, hospital outpatient use, chronic disease, and medical expenditure. Data were analyzed using stepwise multiple and logistic regression. Results : The prevalence of chronic disability in juveniles and adolescents was 31.1 % and 1 %, respectively. The factors affecting medical expenditures included hospitalization use, hospital outpatient use, family income, disability, gender, chronic disease, and emergency room use ($R^2=.160$, p<.05). For national basic livelihood act recipients, the probability of having chronic disease was about 1.6 times higher (OR=1.597, 95 % CI=1.092-2.335, p=.016), compared with non-national basic livelihood act recipients. People with disabilities were 6.6 times more likely than those without disabilities to suffer from chronic disease (OR =6.571, 95 % CI=2.776-15.556, p<.001). Hospital outpatient user was 2.3 times higher than non-user (OR=2.260, 95 % CI=1.702-3.001, p<.001). Juveniles had a 1.7 times and 6.2 times higher likelihood of emergency rooms user (OR=1.654, 95 % CI=1.270-2.155, p<.001), and hospital outpatient user than adolescents (OR=6.208, 95 % CI=4.443-8.676, p<.001). Conclusion : The findings of this study suggest that health care services for juveniles is needed to manage chronic diseases that have an effect on medical expenditures.

• Journal of the Society of Disaster Information
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• v.19 no.3
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• pp.698-709
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• 2023

Purpose: In this paper, we would like to analyze the growth rate of existing urban immersion in the downstream during large-scale urban development and the degree of reduction in existing urban immersion in the downstream when small excellent storage facilities are planned in apartment complexes. Method: A large-scale sewage model was built using the SWMM model of the U.S. Environmental Protection Agency, and the impact of flooding in existing downtown areas downstream was analyzed through simulation. The built model included the development zone, the existing downtown area downstream, and the entire river basin that discharges rainwater. Result: As a result of calculating and simulating the minimum excellent reservoir capacity for each apartment block in the study target area, it was found that the immersion of 4,893㎥ based on one hour, 25,815㎥ based on two hours, and 55,528㎥ based on three hours in the downstream urban area. Conclusion: As in this study, large-scale flooding simulation considering the existing downtown area in the downstream shows a significant increase in flooding in the downstream, and if excellent reservoir capacity is planned for each apartment block before development and the construction of excellent reservoirs is recommended.