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국내 석탄 화력발전소 배출 바닥재의 중금속 용출 가능성 평가
박동원,최한나,우남칠,김휘중,정다위,Park, Dongwon,Choi, Hanna,Woo, Nam C.,Kim, Heejoung,Chung, David 한국지하수토양환경학회 2013 지하수토양환경 Vol.18 No.7
This study was objected to evaluate the potential impact on the groundwater environment of the coal bottom ash used as fill materials on the land surface. From four coal-fired power plants, bottom-ashes were collected and analyzed through sequential extraction and column leaching tests following the meteoric water mobility procedure. The column tests shown leaching heavy metals including Pb, As, B, Cu, Zn, Mn, Ni, Ba, Sr, Sb, V, Cr, Mo, and Hg. The relatively high concentrations of B, Sr, Ba, and V in leachate were attributed to both the higher concentrations in the bottom ash and the relatively higher portion of leachable state, sorbed state, of metals. Bottom-ash samples from the D-plant only show high leaching potential of sulfate ($SO_4$), probably originated from the coal-combustion process, called the Fluidized Bed Combustion. Consequently, to manage recycling bottom ashes as fill materials, an evaluation system should be implemented to test the leaching potentials of metals from the ashes considering the absolute amount of metals and their state of existence in ashes, and the coal-combustion process.
Kim Youlim,Lee Hyun,Park Yeonkyung,정성준,Yeo Yoomi,Park Tai Sun,박동원,김상헌,Kim Tae-Hyung,손장원,윤호주,Moon Ji-Yong 대한천식알레르기학회 2021 Allergy, Asthma & Immunology Research Vol.13 No.5
Besides obesity, there are limited studies regarding the relationship between the individual components of metabolic syndrome and wheezing. It is largely unknown whether the co-existence of other metabolic syndrome components has additive effects on wheezing in the adult population. The association between the individual components of metabolic syndrome and current wheezing was evaluated in adults using data from the Korea National Health and Nutrition Examination Survey from 2008 to 2012. Subjects with metabolic syndrome more frequently had wheezing during the past 12 months (current wheezing) (adjusted odds ratio [aOR] = 1.56; 95% confidence interval [CI] = 1.37–1.77) and wheezing during exercise in the past 12 months (aOR = 1.59; 95% CI = 1.37–1.84). Of the individual metabolic syndrome components, central obesity (aOR = 1.48; 95% CI = 1.31–1.66) and low high-density lipoprotein (HDL) cholesterol (aOR = 1.18; 95% CI = 1.05–1.34) were significantly associated with current wheezing. There were no significant associations between the other components of metabolic syndrome (high triglyceride level, blood pressure, and fasting plasma glucose level) and the presence of current wheezing. In addition, the association was much higher when both central obesity and low HDL cholesterol were present together compared to when either of the conditions was present alone (aOR = 1.67; 95% CI = 1.44–1.94). There is a significant association between metabolic syndrome and current wheezing in Korean adults. Of the components of metabolic syndrome, low HDL cholesterol and central obesity are independently and additively associated with the increased rate of current wheezing.
초청 총설 : 리튬 전지에서 산소, 황의 물리화학적 거동
박동원 ( Dong Won Park ),김진원 ( Jin Won Kim ),김종원 ( Jong Won Kim ),이재영 ( Jae Young Lee ) 한국공업화학회 2012 공업화학 Vol.23 No.3
전기자동차, 하이브리드 자동차의 필요성과 스마트 IT 기기의 급속한 발전으로 인한 고용량 고출력 전지의 수요가 급증하고 있다. 현재 상용화 된 리튬 이온전지는 기술적 문제에 의해 제한된 에너지 밀도만이 이용되고 있어서 보다 높은 에너지 밀도를 갖는 리튬-황 및 리튬-공기전지 개발이 주목 받고 있다. 새로운 Li 배터리 시스템의 양극물질인 황과 산소는 유사한 물리화학적 특성을 갖고 풍부한 자원 매장량으로 상용화가 어렵지 않을 것으로 전망한다. 따라서 본 총설에서는 리튬-황 및 리튬-공기 전지 시스템의 다 공성 구조 양극개발, 양극과 전해질의 계면반응 최적화 및 높은 내구성이 있는 리튬음극 개발과 같은 공통 이슈를 해결하고자 하는 비전을 제시하고자 한다. Of late, the development of advanced batteries with high power density and capacity has been indispensible for pushing ahead with much wider applications to electric vehicles and smart IT devices. However, a conventional Li-ion battery contains a limited energy density due to various technological challenges such that other types of Li batteries including Li-S and Li-air have been extensively studied due to their interestingly high energy capacities. Sulfur and oxygen, of which both are cathode materials, showing similar physicochemical characteristics have widely been available which may also contribute to the commercialization of these batteries. In this review, we introduce some perspectives in improving these advanced Li batteries through several approaches such as the provision of porous cathode structures, the optimization of cathode-electrolyte interfaces and the modification of Li anodes.
승용차용 Steam Powered Co-generation System 차량 해석 모델 개발
박동원(Dongwon Park),김광연(Gwangyeon Kim),이기형(Kihyoung Lee),최경욱(Kyoungwook Choi),김기범(Kibum Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this paper, steam powered co-generation system was developed for recycling exhaust energies of the vehicle. The system has two loops, HT(high temperature) loop recirculating exhaust gas thermal energy and LT(low temperature) loop recuperating engine coolant thermal energy. System layout consideration, vehicle installation and feasibility test were undertaken in this paper.
ZnO 나노와이어를 이용한 FET 소자 제작 및 특성 평가
김경원(K.W. Kim),오원석(W.S. Oh),장건익(G.E. Jang),박동원(D.W. Park),이정오(J.O. Lee),김범수(B.S. Kim) 한국표면공학회 2008 한국표면공학회지 Vol.41 No.1
The zinc oxide(ZnO) nanowires were deposited on Si(001) substrates by thermal chemical vapour deposition without any catalysts. SEM data suggested that the grown nanostructures were the well-aligned ZnO single crystals with preferential orientation. Back-gate ZnO nanowire field effect transistors(FET) were successfully fabricated using a photolithography process. The fabricated nanowire FET exhibits good contact between the ZnO nonowire and Au metal electrodes. Based on I-V characteristics it was found out that the ZnO nonowire revealed a characteristic of n-type field effect transistor. The drain current increases with increasing drain voltage, and the slopes of the Ids-Vds curves are dependent on the gate voltage.