도시하천 악취물질의 발생원조사에 대한 연구

조정구,배병훈,최금찬,임경택 동아대학교 환경문제연구소 1997 硏究報告 Vol.20 No.1

This study has been carried out to investigate odor characteristics and removal methods on the water quality and sulfuric material of four urban sewage. The results from these experiments are as followings ; 1. For sediment, N contents(%) was shown 0.068mg/l at S-1, 0.109mg/l at S-2, 0.043mg/l at S-3, 1.233mg/l at S-4 and S contents(mg/g) was shown 2.192mg/l at S-1, 2.410mgA at S-2, 1.564mg/l at S-3, 15.146mg/l at S-4. The sample of S-4 was indicated the worst value to 1.233mg/l 2. NH₃, one of the representative odor materials, which was showed the highest value at S-1 in the water, showed the highest value at the S-4 in the air. It means that the cause of odor comes from the disintegration of sediment orgamisms, which has more important effect than the water pollution. 3. To control the odor materials, it is desirable to minimizes the inflow of sewage from pollutant source itself. One of the considering odor method is H₂O₂ or activated carbon input into the sewage, which has several advantages as chemical treatment of odor materials is to be desirable.

Investigate Fuel Property of Waste Plastics to Evaluate Potential Use as Solid Refuse Fuel

( Gyung-goo Choi ),( Jun-gu Kang ),( Younghyun Kwon ),( Youngjae Ko ),( Ha-nyoung Yoo ),( Youngjin Lee ),( Junhwa Kwon ),( Tae-wan Jeon ),( Sun-kyoung Shin ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 ISSE 초록집 Vol.2019 No.-

The use of solid refuse fuel (SRF) has recommended to encourage recycling of waste in South Korea. The SRF is produced from combustible wastes which mainly composed of municipal waste (exclude food waste), plastics, synthetic fibers, rubbers and tires. In South Korea, about 1.6 million tons of waste plastics, one of main law material for SRF production, were converted into SRF in 2017. Some waste plastics, however, contain hazardous compounds such as chlorine, sulfur and heavy metals. Therefore, selection process of the waste plastics is important to produce eco-friendly SRF production. Therefore, this study was conducted to evaluate the value of plastics as a fuel. For the purpose, fuel properties of the plastics were investigated by type. The plastic samples used in this study were PVC, PET, PE, PP, PS, LDPE and HDPE. The unclassified plastics were also investigated. The proximate and elemental analyses were performed to examine the fuel property. The metal content and lower heating value of the plastic samples were also detected. The analysis followed the Korean quality standards and methods for SRF. As a result, all plastic samples excluding PVC satisfied the SRF quality standards. The PVC samples had ash, chlorine and sulfur contents higher than the SRF quality standards. This study was supported by a grant the National Institute of Environmental Research (NIER), funded by the Ministry of Environment (MOE) of the Republic Korea (NIER-2018-01-01-048)

순산소 순환유동층에서 로내 탈황 및 탈질법 적용에 따른 오염물질 거동특성

최경구(Gyung-Goo Choi),나건수(Geon-Soo Na),신지훈(Ji-Hoon Shin),길상인(Sang-In Keel),이정규(Jung-Kyu Lee),허필우(Pil-Woo Heo),윤진한(Jin-Han Yun) 한국청정기술학회 2018 청정기술 Vol.24 No.3

순산소 연소기술은 화력발전에 적용 가능한 유망한 온실가스 감축 기술로 평가되고 있다. 본 연구는 환경적 관점에서 순환유동층을 활용한 순산소 연소조건에 로 내 탈황 및 탈질법을 적용하여 NO 및 SO₂의 거동을 살펴보는 한편, SO₃, NH₃, 그리고 N2O의 발생 경향도 관측하였다. 이를 위해, 연소로 내 석회석 및 요소수를 투입하였다. 로 내 탈황법은 연소가스 내 SO₂ 농도를 ~403에서 ~41 ppm까지 저감하였다. 또한 SO₃ 형성의 주원료인 SO₂가 저감되면서 연소가스 내 SO₃ 농도도 ~3.9에서~1.4 ppm까지 감소되었다. 그러나 석회석 내 CaCO₃가 NO의 발생을 촉진하는 현상도 관측되었다. 연소가스 내 NO 농도는로 내 탈질법을 적용하여 ~26 - 34 ppm까지 저감되었다. 요소수 투입량 증가에 따라 연소가스 내 NH₃ 농도가 증가하여 최대~1.8 ppm으로 나타났으며, N₂O의 농도도 ~61에서 ~156 ppm까지 증가하였다. N₂O 발생량 증가 현상은 요소수의 열분해 과정에서 생성된 HNCO가 N₂O로 전환되어 나타난다. 본 연구의 결과를 통해 로 내 연소가스 세정법을 적용할 경우 NOx 및 SOx의 저감뿐만 아니라, 다른 오염물질의 발생에 대한 주의가 필요할 것으로 보인다. Oxy-fuel combustion is considered as a promising greenhouse gas reduction technology in power plant. In this study, the behaviors of NO and SO₂ were investigated under the condition that in-furnace deNOx and deSOx methods are applied in oxy-fuel circulating fluidized bed combustion condition. In addition, the generation trends of SO₃, NH₃ and N2O were observed. For the purpose, limestone and urea solution were directly injected into the circulating fluidized bed combustor. The in-furnace deSOx method using limestone could reduce the SO₂ concentration in exhaust gas from ~403 to ~41 ppm. At the same experimental condition, the SO₃ concentration in exhaust gas was also reduced from ~3.9 to ~1.4 ppm. This trend is mainly due to the reduction of SO₂. The SO₂ is the main source of the formation of SO₃. The negative effect of CaCO₃ in limestone, however, was also appeared that it promotes the NO generation. The NO concentration in exhaust gas reduced to ~26 - 34 ppm by appling selective non-catalytic reduction method using urea solution. The NH₃ concentration in exhaust gas was appeared up to ~1.8 ppm during injection of urea solution. At the same time, the N₂O generation also increased with increase of urea solution injection. It seems that the HNCO generated from pyrolysis of urea converted into N₂O in combustion atmosphere. From the results in this study, the generation of other pollutants should be checked as the in-furnace deNOx and deSOx methods are applied.

탄소동위원소법을 활용한 고형연료제품 내 바이오매스 함량 측정방법

최경구(Gyung-Goo Choi),강준구(Jun-Gu Kang),김규연(KyuYeon Kim),권영현(YoungHyun Kwon),유하녕(Ha-Nyoung Yoo),이수영(SuYoung Lee),양원석(WonSeok Yang),이원석(WonSeok Lee),신선경(Sun-Kyoung Shin) 유기성자원학회 2019 유기성자원학회 학술발표대회논문집 Vol.2019 No.추계

고형연료제품이란 가연성 고형폐기물을 사용하여 품질기준에 적합하게 제조한 연료 용도의 재활용제품을 의미한다. 고형연료제품의 품질기준은 자원의 절약과 재활용 촉진에 관한 법률 시행규칙 별표 8(고형연료제품의 품질기준)에 의해 규정된다. 품질기준은 일반 고형연료제품과 바이오 고형연료제품으로 구분하여 제시하고 있다. 과거 고형연료제품의 바이오매스 함량은 바이오 고형연료제품에 한하여 측정하였다. 그러나 2019년 10월 1일부터 신재생에너지법에 의해 폐기물에너지가 생물기원 폐기물로부터 발생한 에너지로 한정됨에 따라 일반 고형연료제품도 바이오매스 함량을 측정하게 되었다. 그동안 고형연료제품 내 바이오매스 함량은 환경부고시 제 2014-135호에 따라 육안선별법과 용해선별법으로 측정하고 있었다. 육안선별법은 물질 특성 분류표에 따라 고형연료제품의 원료를 바이오매스와 비 바이오매스로 구분하고 바이오매스 함량을 결정하는 방법이다. 용해선별법은 황산 및 과산화수소에 고형연료제품 내 바이오매스를 용해시켜 그 양을 산정하는 방법이다. 그러나 육안선별법은 분석자의 주관이 결과에 영향을 줄 수 있는 여지가 있고, 용해선별법은 황산 및 과산화수소에 비 바이오매스 성분이 용해되어 바이오매스 함량이 과다 평가되는 한계가 있다. 때문에 국외의 경우에는 탄소동위원소법을 추가로 제시하여 분석의 정확도를 향상시키고 있다. 탄소동위원소법은 연료의 연소로 발생되는 이산화탄소 중 탄소동위원소를 분석 및 추적하여 연료 내바이오매스 함량을 산정하는 방법이다. 본 연구는 탄소동위원소법과 용해선별법을 이용하여 고형연료제품 내 바이오매스 함량을 측정하여 비교하였다. 이를 통해 보다 정확한 고형연료제품 내 바이오매스함량 분석 방법을 제시하고 탄소동위원소법의 국내 도입방안을 마련하고자 하였다.

요소수를 이용하는 SNCR과 SCR의 탈질 특성 비교 연구

최경구(Gyung-Goo Choi),길상인(Sang-In Keel),이정규(Jung-Kyu Lee),허필우(Pil-Woo Heo),윤진한(Jin-Han Yun) 한국에너지기후변화학회 2018 에너지기후변화학회지 Vol.13 No.2

This research examined the reduction of NO by applying SCR(selective catalytic reduction) and SNCR(selective non-catalytic reduction) methods in oxy-fuel circulating fluidized bed combustion. The SO₂ reduction was also investigated by applying the FGC(flue gas condenser) for the dry flue gas recirculation. Especially, the effects of furnace (~803–951°C) and SCR reactor (~250–351°C) temperatures on the NO reduction were observed. The SNCR method could reduce the NO concentration in flue gas from ~168–172 to ~18–51 ppm, and the optimal combustion temperature was ~854°C. As the combustion temperature was ~803°C, the NH₃ slip was occured to the SCR reactor and further reduction of NO in SCR reactor was appeared. Through this phenomenon, the possibility was confirmed that the induced NH₃ slip at SNCR method can be used in SCR reactor for NO reduction. So, the simultaneous application of the SNCR and SCR method can accomplish the reduction agent saving for NO<SUB>x</SUB> reduction. On the other hand, the FGC using only water showed excellent performance for SO₂ reduction. It could reduce the SO₂ concentration in flue gas from ~253–276 to ~0 ppm. The SCR method was able to reduce the NO concentration in flue gas from ~169–174 to ~25–38 ppm and the optimal SCR reactor temperature was ~302°C. The SCR method achived better NO reduction performance than SNCR method. At the condition that urea solution injected as NH₃/NO ratio of ~2, NO reduction effieicy of SCR method was calculated to ~20% better than SNCR method.

대량의 상부 위장관 출혈을 유발한 십이지장게실 1 예

최정호,김은영,김경원,박희욱,정규영,구영훈,박승근,옥종한 대한소화기내시경학회 2000 Clinical Endoscopy Vol.21 No.3

Duodenal diverticulum is well-known pathologic entity. The incidence of duodenal diverticulum varies from 5% to 23% in the general population. Most of diverticula are asymptomatic and have been incidentally observed in upper gastrointestinal series or upper gastrointestinal endoscopy. It usually occurs in the second portion and the medial side of duodenum. The complications of duodenal diverticulum are rare but often result in significant morbidity. They include obstruction, cholelithiasis, ascending cholangitis, ulcers, hemorrhage and perforation. Major gastrointestinal hemorrhage resulting from an inflamed or ulcerated duodenal diverticulum is an uncommon event and it can be treated endoscopically. We report a case of massive upper gastrointestinal bleeding from a duodenal diverticulum which was treated endoscopically.

Regulation of PDGF signalling and vascular remodelling by peroxiredoxin II

Choi, Min Hee,Lee, In Kyung,Kim, Gyung Whan,Kim, Bang Ul,Han, Ying-Hao,Yu, Dae-Yeul,Park, Hye Sun,Kim, Kyung Yong,Lee, Jong Seo,Choi, Chulhee,Bae, Yun Soo,Lee, Byung In,Rhee, Sue Goo,Kang, Sang Won Nature Publishing Group 2005 Nature Vol.435 No.7040

Platelet-derived growth factor (PDGF) is a potent mitogenic and migratory factor that regulates the tyrosine phosphorylation of a variety of signalling proteins via intracellular production of H<SUB>2</SUB>O<SUB>2</SUB> (refs 1, 2–3). Mammalian 2-Cys peroxiredoxin type II (Prx II; gene symbol Prdx2) is a cellular peroxidase that eliminates endogenous H<SUB>2</SUB>O<SUB>2</SUB> produced in response to growth factors such as PDGF and epidermal growth factor; however, its involvement in growth factor signalling is largely unknown. Here we show that Prx II is a negative regulator of PDGF signalling. Prx II deficiency results in increased production of H<SUB>2</SUB>O<SUB>2</SUB>, enhanced activation of PDGF receptor (PDGFR) and phospholipase Cγ1, and subsequently increased cell proliferation and migration in response to PDGF. These responses are suppressed by expression of wild-type Prx II, but not an inactive mutant. Notably, Prx II is recruited to PDGFR upon PDGF stimulation, and suppresses protein tyrosine phosphatase inactivation. Prx II also leads to the suppression of PDGFR activation in primary culture and a murine restenosis model, including PDGF-dependent neointimal thickening of vascular smooth muscle cells. These results demonstrate a localized role for endogenous H<SUB>2</SUB>O<SUB>2</SUB> in PDGF signalling, and indicate a biological function of Prx II in cardiovascular disease.

형광 지시약을 이용한 사과 과육 내 칼슘 분포의 실시간 분석

도경란(Gyung Ran Do),김정희(Jeong Hee Kim),이준구(Joon Goo Lee),신일섭(Il Sheob Shin),최인명(In Myung Choi),한점화(Jeom Hwa Han),조정건(Jung Gun Cho),손인창(In Chang Son) 한국원예학회 2011 한국원예학회 학술발표요지 Vol.2011 No.10

Korean Mistletoe Viscum album coloratum Induces Specific and Non-Specific Immune Responses in Japanese Eel Anguilla japonica

Sang-Hoon Choi(최상훈),Jin-Goo Rhow(노진구),Min-Soon Choi(최민순),Sung-Woo Park(박성우),Kwan-Ha Park(박관하),Jong-Man Yoon(윤종만),Gyung-Il Park(박경일) 한국수산과학회 양식분과 2009 韓國養殖學會誌 Vol.22 No.1

Molecular Imaging of Arthritis in the Angiogenic Vasculature Using A ¹²³I-Vascular Endothelial Growth Factor Receptor Antibody

Kim, Sung-Min,Choi, Na-Eun,Song, Young-Kyu,Cho, Gyung-Goo,Bang, Jeong-Kyu,Kim, Sang-Mi,Lee, Sang-Hoon,Ryu, Eun-Kyoung Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.6

Vascular endothelial growth factor (VEGF) and its receptor (VEGFR) have been implicated in the pathogenesis of rheumatoid arthritis, which is angiogenesis dependent. Antibody-based molecular imaging improves targeting, and antibody radiolabeling is useful for monitoring biological events $in$ $vivo$ $via$ PET or SPECT. We investigated the potential of molecular imaging to diagnose arthritis with VEGFR-2 $in$ $vivo$. The $^{123}I$-VEGFR-2 antibody was prepared by the iodogen tube method. The radioligand was injected into arthritic mice, and micro SPECT/CT was performed. The arthritic mice were examined by 4.7-T MRI and immunohistochemistry. The $^{123}I$-VEGFR-2 antibody showed high uptake in the arthritic region at 1 h postinjection on SPECT/CT but no uptake in the control animals after radioligand injection. In MR images, the arthritic tissue of the mice was correlated with regions labeled by the $^{123}I$-VEGFR-2 antibody. Immunohistochemical localization showed markedly increased expression of VEGFR-2 in the endothelial cells, fibroblasts, and macrophages of the arthritic mice.