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소화가스의 막 분리 정제에 의한 도시가스용 바이오메탄 생산
최근희,조민석,최원영,천승규 한국응용과학기술학회 2020 한국응용과학기술학회지 Vol.37 No.5
Research was conducted on the production of bio-methane for city gas, from food waste digestion gas using two membrane-separation methods(4SBR and 3SDR) in a commercial plant. A purity of 98.9% can be obtained using either method. The recovery rate of methane from the digestion gas was 88.1% for 4SBR and 79.4% for 3SDR. the ratios of bio-methane production to treated digestion gas were 53.5% for 4SBR and 49.4% for 3SDR. However, the 4SBR method had a higher ratio of returned gas(56.5%), approximately twice that of 3SDR, making 3SDR the more desirable method in terms of maximum treat capacity. Therefore, 4SBR seems more economical when the digestion gas to be treated is less than 200 Nm 3 /day, while 3SDR is more suited to treat gas volumes of more than 240 Nm 3 /day. The relative deviation of each operation index, compared to mean values, was generally greater for the 4SBR method. Additionally, the correlation coefficients between major system indexes, such as bio-methane production and bio-methane draw out pressure(which is the main control measure of membrane facility) showed that these indexes are more closely related in the 3SDR method. 막 분리 운전방식에 따른 음폐수 소화가스의 도시가스용 바이오메탄 생산연구를 상업용 시설을 대상으로 수행하였다. 연구결과 바이오메탄의 순도는 4SBR과 3SDR 모두 98.9%를 달성할 수 있었다. 소화가스 내 메탄 회수율은 4SBR 88.1%, 3SDR 79.4%이었고, 처리 소화가스량 대비 바이오메탄 생산율도 4SBR이 53.5%로 3SDR의 49.4%보다 높았다. 그러나 막 분리시설에 공급되는 가스 중 반송 가스의 비율은 4SBR이 56.5%로 3SDR 보다 두 배가량 컸으며, 이로 인해 최대 처리량에 있어서는 3SDR이 양호한 결과를 보였다. 따라서 소화가스 200 Nm 3 /day 이하는 4SBR, 240 Nm 3 /day 이상에서는 3SDR이 경제성이 좋은 것으로 판단되었다. 공정 운전변수 들의 평균값 대비 운전 값들의 상대편차는 전반적으로 4SBR이 컸으며, 또한 주 운전조절 수단인 바이오메탄 인출압력 대비 주요 지표들의 상관관계에 있어서는 3SDR가 보다 직접적인 관계를 보여주었다.
崔瑾熙 서울시립대학교 법학연구소 1993 서울법학 Vol.1 No.0
The purpose of this paper is to find an alternative of distributive justice most suitible to our society, via investigating the three schools’ core ideas on distributive justice under capitalism. Rawlsians (egalitarians) desire the amelioration of inequalities to benefit the most disadvantaged rather than society as a whole, while Nozickians (libertarians) believe that a laisses-faire economic order can create a society that is both efficient and just. Social Darwinist, on the other hand, argue that inequalities are the most inevitable factor for the progress of society. I partially agree to Rawls’ idea since he does not clarify who are the most disadvantaged. I would like to suggest “the Basic Good Egalitariansim” as a principle of distributive justice which needs us. The Basic Good Egalitariansim means that a society should provide people with health service, housing, education, food which are necessary for humanistic survival of all.
외국인 및 한국인 직접투자의 도시경제 파급효과에 관한 연구
최근희,이윤희 영남대학교 중국연구센터 2008 중국과 중국학 Vol.8 No.-
The Chinese economy recorded by 8∼10% annual growth during the past two decades. China became the 3rd economic superpower and the 2rd large trade country in the world. We can say that one of the major factors of rapid economic growth in China would be the FDI. China became the largest trade partner of Korea and thus the Chinese economy is closely tied with the Korean economy. The purpose of this research is to analyze the effects of FDI and Korea’s investment in the city of Tianjin, via using the regional input-output model. We found out that the FDI of Tianjin would result in the production effects of 6,819,531,000 dollar increase in production, 44,049 increase in jobs creation and 6,353,787,078 dollar increase in value-add. In addition, the result of Korea’s FDI in Tianjin is the production effect of 526,668,000 dollar and employment effect of 3,509 new jobs and the value added effect of 441,704,000 dollars. We can know that FDI has significant effects of economy in Tianjin. The Korean direct investment has large effects on the Tianjin economy. This study has important implication.
최근희,정성준,강민재,윤주영,이지은,이영아,신충호,양세원 대한소아내분비학회 2013 Annals of Pediatirc Endocrinology & Metabolism Vol.18 No.4
Purpose: Brain magnetic resonance imaging (MRI) findings and factors predictive of pathological brain lesions in boys with precocious puberty (PP) or early puberty (EP)were investigated. Methods: Sixty-one boys with PP or EP who had brain MRI performed were included. PP was classified into the central or peripheral type. Brain MRI findings were categorized into group I (pathological brain lesion known to cause puberty; newly diagnosed [group Ia] or previously diagnosed [group Ib]); group II (brain lesion possibly related to puberty); and group III (incidental or normal findings). Medical history, height, weight,hormone test results, and bone age were reviewed. Results: Brain lesions in groups I and II were detected in 17 of 23 boys (74%) with central PP, 9 of 30 boys (30%) with EP, and 7 of 8 boys (88%) with peripheral PP. All brain lesions in boys with peripheral PP were germ cell tumors (GCT), and 3 lesions developed later during follow-up. Group I showed earlier pubertal onset (P<0.01)and greater bone age advancement (P<0.05) than group III. Group III had lower birth weight and fewer neurological symptoms than “Ia and II” (all P<0.05). Conclusion: Earlier onset of puberty, greater bone age advancement, and/or neurological symptoms suggested a greater chance of pathological brain lesions in boys with central PP or EP. All boys with peripheral PP, even those with normal initial MRI findings, should be evaluated for the emergence of GCT during follow-up.