• 유기물자원화
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• 제19권1호
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• pp.115-122
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• 2011

의류용 세탁세제와 샴푸와 같은 합성세제가 혼입된 먹이를 급이하였을 경우 줄지렁이 개체군의 산란률, 난포당 부화개체수 및 차세대 발육 유충수의 증가를 유발시켰으며, 산란된 난포의 부화율에는 영향을 미치지 않는 것으로 나타났다. 따라서 생태독성학적 측면에서 합성세제는 줄지렁이 개체군에 대해 독성 현상을 유발하지 않으며 가정에서 사용하는 합성세제는 하수슬러지를 지렁이에게 지속적으로 급이하였을 때 나타나는 지렁이 개체군 소멸현상의 직접적인 원인이 아닌 것으로 판단된다.

• 한국식품과학회지
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• 제53권3호
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• pp.348-355
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• 2021

Bacteriophages (phages) are known determinants of kimchi microbial ecology. Lactobacillus plantarum is related to kimchi over-acidification during the late stages of kimchi fermentation. A phage infecting Lac. plantarum was isolated from kimchi and characterized. The phage population for kimchi in a market was 2.3 log particles/mL, which corresponded to 32% of the bacterial population on a log scale. The isolated phage was designated as ΦLP12116. ΦLP12116 which belonged to the Siphoviridae family and has a very narrow host range, infecting only Lac. plantarum. The phage was stable at a lactic acid concentration of 1.0% and pH 4.0 at 4℃, indicating that it could survive in kimchi. In the kimchi extract broth treated by the phage, the growth of Lac. plantarum KCCM 12116 was inhibited by 2.2 log CFU/mL compared to the growth in non-phage-treated broth. Therefore, this study suggests that the growth of Lac. plantarum, which is known as an acid-producing strain during late fermentation in kimchi, may be controlled using the phage.

• 동아시아경상학회지
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• 제2권2호
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• pp.58-67
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• 2014

If we compare the GDP per Capita for the last 20 years between Philippines and other ASEAN countries, Philippines remains in the lowest on GDP per Capita. This paper is trying to find out the possible reasons for the low growth rate of the GDP per Capita in the Philippines. 53 years data from the World Bank are used explore the relationships between the GDP per Capita and eight economic indicators to run three time series models and one to one regression. Three indicators, namely, consumer price index, gross capital formation as a percentage of GDP and population are remarked with possible contribution to the low growth rate of the GDP per capita of the Philippines.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2023년도 학술발표회
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• pp.394-394
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• 2023

The world's sustainable growth is being severely hampered by the inefficient use of water resources. Despite the widely acknowledged importance of trade in global and regional water and food security, societal reliance on local production as well as international trade remains inadequately assessed. Therefore, using South Korea as a case study, this study fills in this research gap by applying the virtual water concept, the logarithmic mean divisia index (LMDI) method, and the Tapio decoupling model. The virtual water concept was used to estimate South Korea's net virtual water trade for major grain crops from 1992 to 2017. Then, the LMDI method was utilized to assess the driving factors causing changes in net virtual water trade. Lastly, the Tapio decoupling model was used to investigate the decoupling relationships between economic growth and the driving factors of net virtual water trade. Results showed that South Korea remains a net importer of virtual water flows with respect to grain crops, with an average import of 16,559.24 million m³ over the study period. In addition, the change in net virtual water trade could be attributed to water intensity effect, product structure effect, economic effect, and population effect. However, water intensity and economic effects were the major decisive factors for decrease and increase in net virtual water trade respectively, while the population and product structure effects had minor positive influences on the net virtual water trade. Furthermore, water intensity and economic growth showed a strong decoupling in most periods, while the decoupling state between product structure and economic growth was observed as expansive negative decoupling. Likewise, population size and economic growth showed a weak decoupling in most periods. The results reveal South Korea's status as it concerns the virtual water trade of grain crops, thus providing valuable insights into the sustainability of trade activities for the management of local water resources.

• 식품과학과 산업
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• 제54권2호
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• pp.102-114
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• 2021

In Korea, a sugar company was first established at Pyongyang in 1920. But the real sugar industry began in 1953 when CJ Cheiljedang produced sugar at its Busan plant. Currently, three companies, CJ Cheiljedang, Samyang Corp., and TS Corp. are participating in the sugar industry. Sugar production increased from 647 tons in 1953 to 1,423 thousand tons in 2019. This means that the sugar industry has been grown by 2,200 times compared to 1953. Before 1953, all sugar consumed in Korea was imported, but now about 300 thousand tons, a 20 percent of sugar produced annually is exported. Population increase, economic growth, and food industry development contributed to the growth of sugar industry. However, recently the sugar industry has been stagnated due to the decrease of population and economic growth rate, and campaign of sugars and calories reduction. To overcome it, the continued development of various sugar application using emerging biotechnology is needed.

• 한국수소및신에너지학회논문집
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• 제24권1호
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• pp.20-28
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• 2013

Photobiological hydrogen production by nitrogen-fixing unicellular cyanobacteria has long been considered to be an environmentally sound and very promising method for the future supply of renewable clean energy. Using six Korean nitrogen-fixing unicellular cyanobacterial strains and the Synechococcus sp. strain Miami BG043511 we performed cultivation experiments to find out the strain-specific optimal temperature for population growth and $H_2$ production. Under $20^{\circ}C$ the population growth of all the tested strains was significantly retarded in contrasts to the faster and higher growth under 25, 30 or $35^{\circ}C$. The highest growth rates in all the 7 strains were measured under $30^{\circ}C$ while the maximal biomass yields were under $30^{\circ}C$ (strains CB-MAL 026, 054, and 055) or $35^{\circ}C$ (strains 002, 031, 058, and Miami BG043511). The difference between the maximal biomass yields at $30^{\circ}C$ and $35^{\circ}C$ was not greater than 10%. The quantity of photobiologically produced $H_2$ was only slight larger under $35^{\circ}C$ than that under $20^{\circ}C$. Our result may suggest a two-step process of $H_2$ production which includes rapid and sizable production of biomass at $30^{\circ}C$ and the following high $H_2$ production at $20^{\circ}C$ by the test strains of marine nitrogen-fixing unicellular cyanobacteria.

• 한국재난정보학회 논문집
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• 제16권3호
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• pp.479-492
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• 2020

연구목적: 본 연구의 목적은 우리나라 수도권을 대상으로 권역별 특성이 인구이동에 미치는 영향을 분석하는 것이다. 연구방법: 이를 위해 수도권의 66개 기초지자체는 2010~2016년 인구이동자료 분석을 통해 3개의 권역으로 구분하고, 단계적 회귀분석기법을 적용하여 권역 내부의 인구이동 결정요인과 권역 간 인구이동 결정요인을 파악하였다. 연구결과: 주요 분석결과로 수도권 전 지역에서의 인구이동에서는 지역의 아파트 수 증가율, 단독·다세대주택 증가율, 고용자 수 증가율, 제조업체 증가율, 지식·문화·여가산업 증가율, GRDP증가율, 지하철역 신규개통이 중요하다는 것이 확인되었다. 특히 아파트 수 증가율, 지식·문화·여가산업 증가율, GRDP 증가율, 지하철 역 신규개통은 인구유입을 늘리는데 긍정적으로 작용하였다. 결론: 권역별로 지식·문화·여가산업 증가율이 1권역의 인구유입에 크게 기여했으며, 2권역에서는 지하철역 신규개통과 GRDP증가율이 주요 요인인 것으로 나타났다. 아파트 수 증가율과 지하철역 증가율은 3권역에서 주요 요인으로 작용하였다.

• 한국인구학
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• 제14권1호
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• pp.1-25
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• 1991

The Purpose of this study is to analyze the contribution of the total human capital formation to economic growth in Korea. In order to assess the contribution of the total human capital formation to economic growth, aggregate production functions are estimated using two ways of ordinary least squares and polynomial distributed lags based on 1955 - 1988 time series data in Korea. The total amount of investment in human capital is calculated by adding each amount of investment in formal education, vocational training, inter-provincial migration, and health in pecuniary terms. The findings of this study could be summarized as follows ; (1) If we enumerate the variables in good order according to the importance, we get the following ; namely, total number of labor force, inter-provincial migration, vocational training, health, physical capital, and formal education. (2) The contribution of the human capital to economic growth is much more larger than that of physical capital. In particular, it appears that inter-provincial migration and vocational training make a great contribution to economic growth. (3) It appears that investment in formal education has a continuous effect for fifteen years and maximum effect is observed approximately eight years later. In the case of vocational training, the effect of investment lasts for about 12-14 years and its effect on economic growth reaches maximum with the passage of seven to eight years after initial investment. (4) Investment in vocational training contributes more in the long run compared with investment in formal education. The effect of investment in formal education lasts longer than that of vocational training, while the effect of investment in vocational training is considerably larger in the short run compared with the investment in formal education.

• 한국수산과학회지
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• 제36권6호
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• pp.646-653
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• 2003

Investigations were made on the population structure, sex ratio, growth, and recruitment patterns of Leptochela sydniensis in the southwestern coastal areas of Korea, between May 2000 and December 2001. Spawning period, fecundity, brood loss, reproductive output, and size at sexual maturity also were examined. The results of the sex ratio showed that females were more numerous than males during the overall study period. Parameters of growth were estimated using the modified von Bertalanffy growth function (VBGF) model incorporating seasonal variation into growth. Females grew somewhat faster and reached a larger size than males $(L\infty=12.80\;mm\;CL\;and\;K=0.70\;yr^{-1}\;or\;females,\and\;L\infty=12.08\;mm\;CL\;and\;K=0.69\;yr^{-1}$ for males). The structure of recruitment patterns obtained by the FiSAT program indicated one normally distributed group. Based on the occurrence of ovigerous females and the gonadosomatic index (GSI), the main spawning season was from June to August. Analysis of covariance indicated that brood loss was not observed during the incubation period. The size at which $50\%$ of females are mature is estimated as 5.48 mm CL.

• The Korean Journal of Ecology
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• 제19권6호
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• pp.507-517
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• 1996

To explain the horizontal expansion of a rhizomatous perennial, Convallaria keiskei(lily-of-the-valley), in a study site of Chunchon, Kangwon Province, Korea, ramet growth and clonal structure were studied. Remarkable growth stategies were clarified. First, the timing for the successive phenological events such as sprouting. flowering and rhizome growth for lily-of-the-valley was fitted to exploit early spring when the canopy of overstory was opened. Second, these events were supported by effective matter allocation pattern: for example, two-year investment for new rhizomes enabled the first year ramets to mature in six weeks after sprouting and to grow up to 85% of the leaf area of perennial ramets. Finally, the ramet population was increased by local disturbances such as freezing, herbivory and collection by human. The rule that a clone was supposed to produce one new thizome per year was broken by occasional disturbances. Then, up to 5rhizomes from latent bur could be redeveloped. Based on clonal structure, 80% or total clones have from 1 to 4 ramets. this means there have occurred minor disturbances. Therefore, in conclusion, the successful flourishing of lily-of-the-valley came from its effective frowth strategy to take advantage of site disturbance.