• Journal of Nutrition and Health
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• 제22권2호
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• pp.108-117
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• 1989

The purpose of this study was aimed to investigate the historical tends of population growth which has reflected direct effect of the ratio of food self sufficiency in Korea between the year of 1910 and 1980. Author divided the whole years between 1910 and 1980 into five different periods ; colonial period from 1910 to 1945, post colonial period from 1945 to 1950, Korean war period from 1950 to 1955, post Korean war period from 1955 to 1960, fast economic growing period 1960~1980. The ratio of national food self sufficiency has been profoundlly affected by dual factors ; rate of population group and increment of GNP which reflect the national economic development. Total food production never reached the level of population growth ratio in Korea. As a result food demand and supply has shown imbalaced condition which leads to import foods from outside contury to compensate food shortage. The increment of GNP sharply cut down the cereal consumption. The consumption of fish, milk, eggs and meat reflected to increase since 1970.

• 한국항공운항학회지
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• 제27권1호
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• pp.43-50
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• 2019

The aviation demand forecast field has been actively studied along with the recent growth of the aviation market. In this study, the demand for domestic passenger demand and freight demand was estimated through cross-validation method. As a result, passenger demand is influenced by private consumption growth rate, oil price, and exchange rate. Freight demand is affected by GDP per capita, private consumption growth rate, and oil price. In particular, passenger demand is characterized by temporary external shocks, and freight demand is more affected by economic variables than temporary shocks.

• Korean Chemical Engineering Research
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• 제54권6호
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• pp.775-780
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• 2016

최근 태양전지 산업에서는 효율과 더불어서 생산성을 높이고 원가를 절감할 수 있는 설계가 요구되고 있다. 생산성의 향상을 위하여 반응기의 크기를 키우면 기존의 8 inch 잉곳에서 12 inch 잉곳으로 생산이 가능하다. 또한 연속공정법을 사용하여 생산성 증대를 극대화 시킬 수 있다. 본 연구에서는 12인치 잉곳이 최적 컨디션의 수율향상을 위한 소비전력 감소와 생산성 향상에 관한 시뮬레이션을 진행하였다. 인출속도 별 계면 형상과 폰-미제스 스트레스, 온도구배, 소비전력을 비교하여 최적의 인출속도를 찾았다. 그 결과, 생산성 향상과 에너지를 절감할 수 있는 최적 공정 파라미터를 도출할 수 있었다. 이러한 연구는 실제 태양전지 산업에서 생산성 향상에 기여할 수 있을 것으로 기대 된다.

• 한국수산과학회지
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• 제30권5호
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• pp.874-881
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• 1997

곤쟁이 Neomysis awatschensis의 치하와 성체에 대한 중금속의 급성독성 수준과 아치사 농도에서 생존, 성장, 탈피 및 산소소비에 미치는 cadmium, copper 및 chromium의 독성을 검토하였다. Cadmium, copper 및 chromium에 대한 곤쟁이 성체의 $96hr-LC_{50}$은 각각 20.2, 11.3, $670.4\;{\mu}g/\ell$, 치하에서는 각각 3.4, 1.9 및 $49.4\;{\mu}g/\ell$이었다. 성체와 치하의 $96hr-LC_{50}$을 기준으로 중금속의 독성은 copper>cadmium>chromium 순이었다. 치하를 각 중금속의 아치사 농도에 40일간 노출시키면서 생존, 성장 및 탈피에 미치는 영향을 조사한 결과, 생존율은 cadmium이 $\geq1.0\;{\mu}g/\ell,\;copper\geq0.6\;{\mu}/\ell$에서 유의한 감소를 보였다. 성장률은 cadmium $2.0\;{\mu}g/\ell$와 copper $\geq1.2\;{\mu}g/\ell$의 농도에서 유의한 감소가 관찰되었으나 탈피기간에는 영향이 없었다. 산소소비량은 중금속 농도가 높을수록 감소하였고, 대조구의 산소소비량을 기준으로 하여 중금속 농도에 따른 산소 소비량은 cadmium과 copper는 $5\;{\mu}g/\ell$ chromium은 $10\;{\mu}g/\ell$ 농도에서 약 $50\%$ 감소하였다. 이상의 결과로부터 하구역에 cadmium이 $\geq1.0\;{\mu}g/\ell$, copper가 $\geq0.6\;{\mu}g/\ell$ 농도가 존재할 경우 곤쟁이의 분포와 개체군의 크기에는 많은 영향을 미칠 것으로 사료된다.

• 한국수산과학회지
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• 제33권5호
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• pp.408-412
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• 2000

염분에 대한 날개망둑의 내성범위를 파악하기 위한 일환으로 이들의 생존, 성장 및 대사에 미치는 염분의 영향을 40일간 사육 실험을 통하여 검토하였다. 날개망둑의 생존율은 염분 $10.1{\%_{\circ}}$ 이상에서 $90{\%}$ 이상을 나타냈으나, 염분 $6.7{\%_{\circ}}$ 이하에서는 유의한 감소를 나타냈고, 담수에서는 40일째 $5{\%}$의 생존율을 보였다. 성장은 $20.2{\~}33.6{\%_{\circ}}$의 염분 범위에서 유사한 체장, 체중의 증가 및 일일성장률을 나타냈으나, 염분 $10.1{\%_{\circ}}$ 이하에서 유의한 감소가 관찰되었다. 산소소비는 염분 $20.2{\~}33.6{\%_{\circ}}$에서 유사하게 나타났으나, 염분 $13.4{\%{\circ}}$ 이하에서 염분이 감소함에 따라 감소하는 경향을 보여 염분 13.4, 10.1, 6.7 및 $3.4{\%_{\circ}}$에서 각각 15.8, 19.3, 18.6 및 $24.1{\%}$의 유의한 감소를 보였고, 담수에는 $28.2{\%}$의 감소가 관찰되었다. 이러한 결과는 낮은 염분에서 생존, 성장 및 산소소비율이 낮다는 것을 지적하고 있으며, 염분의 농도차이가 연안지역이나 기수지역에서 자연사망율에 잠재적으로 영향을 미칠 수 있다는 것을 암시한다.

• 복식문화연구
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• 제21권3호
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• pp.413-430
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• 2013

Despite the recent sharp growth in the baby product market, previous studies on preschooler clothing have centered primarily on surveys regarding body size and consumer buying behavior, with little emphasis given to consumption value in preschooler clothing. This study aimed to assess the feasibility of using standards of consumption value to examine the behavior of those who buy preschooler clothing. The research subjects were mothers of preschoolers aged 1 to 6 years. They were asked to complete a questionnaire online at major parenting blogs found on portal sites (n=346). The questionnaire contained 41 questions based on a literature review, and 25 questions having convergent and discriminant validity were analyzed. By conducting a regression analysis of standards of consumption value in preschooler clothing and their perceived value, the feasibility of the standards was assessed. The results showed that consumption value in preschooler clothing was associated with 21 questions and 8 factors. The factors measuring consumption value included vicarious satisfaction, social value, functional value, convenience, financial value, aesthetic value, uniqueness, and circumstantial value. This study is significant in that it expands the scope of research on preschooler clothing, lays the groundwork for measuring consumption value in preschooler clothing, and predicts consumer behaviors by identifying the consumption value among mothers of preschoolers.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2008년도 춘계학술발표대회 논문집
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• pp.336-341
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• 2008

For the last half a century, Korea has been experienced rapid economic growth and industrialization development, however they cause serious problems that environment pollution and energy shortage are appeared, and the biggest problem that we are now confronted are required solutions through all over the world. Now, Korea's energy consumption is the 10th in the whole world. Among them, energy for buildings, about 25% in the whole Energy which spend in Korea, is very serious. Especially, the energy consumption of school buildings which have heating & cooling system according to improvements of educational environment are rapidly increasing. These features are explicit in the University, Because it has lots of colleges and facilities for lecture, experiment, and research. Especially, electric power consumption account for 75 percent of energy consumption in educational institutions. Accordingly, it is important to understand and analyze the pattern of electricity energy consumption which is used. This study attempts to appoint the place which is one of university and to investigate the characteristics of energy consumption like electricity, gas, oil.

• KSBB Journal
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• 제4권1호
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• pp.31-33
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• 1989

하이브리도마의 회분식 배양에서 세포증식 속도가 기질의 소비 속도나 단일클론 항체의 생산에 미치는 영향을 조사하였다. 세포의 증식속도를 조절하는 방법으로는 다음 3가지를 이용하여다. 1)배양액내 혈청의 농도를 낮추는 방법, 2) 배양온도를 낮추는 방법, 3)세포증식 억제제를 첨가하는 방법, 실험결과에 따르면 위의 세가지 방법에 의해 세포증식 속도가 20~50% 감소하는 동안 기질의 소비속도와 암모니아의 생성 속도는 40%까지 감소하였다. 반면에 단일클론 항체의 최종농도는 하이브리도마 세포의 증식이 저해되지 않았을 경우데 비해 100%까지 증가하는 것으로 나타났다. 따라서 이 결과는 하이브리도마 배양에서 단일크론 항체 생산의 증가에 유용한 방법으로 이용 될 수 있다.

• 한국수산과학회지
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• 제49권5호
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• pp.600-606
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• 2016

The effects of feeding frequency on the growth, food consumption, body composition, and hematological response of the Korean rockfish Sebastes schlegelii were investigated for 77 days at ambient water temperatures (17.2-24.5℃) in a sea cage in Tongyeong, Korea. Three replicate groups of fish were hand-fed to satiation with a commercial diet in one of four different feeding frequency trials (one meal every 2 days, and one, two and three meals per day). At the end of the experiment, the mean weight gain, specific growth rate, and daily feed intake of fish fed one and two meals per day were significantly higher than those of fish fed one meal every 2 days or three meals per day. The feed efficiency of the fish fed three meals per day was significantly lower than that of the fish in the other groups. The glucose concentration of fish fed one meal every 2 days was significantly higher than that of the other groups. We conclude that the optimum feeding frequency for improving the growth of Korean rockfish weighing 100-200 g reared in sea cages is one meal per day under our experimental conditions.

• KDI Journal of Economic Policy
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• 제38권4호
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• pp.23-44
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• 2016

Household debt in Korea raises concerns about the resilience of the economy due to its size and quality. Against this backdrop, we investigate if household leverage matters for private consumption in adverse economic environments even without severe financial disruptions. We find that the balance sheet positions in terms of the leverage ratio may weaken consumption growth. We also find that the depressive effect of debt on consumption may differ across types of consumer spending and household characteristics. In particular, the effects of indebtedness have been much stronger in relation to durable goods expenditures than in other areas. In addition, debtors in high-income (wealth) groups have also shown downward adjustments in consumption even more so than low-income (wealth) groups. These findings imply that debtors' precautionary behavior may serve as an important channel from leverage to consumer spending.