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A solution method for the large scale production of multiwall carbon nanotubes
Dae-Sup So,Haiwon Lee,김우식,Bong Geun Choi,방신영,Heon Ham,심광보 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.2
Large scale production of multiwall carbon nanotubes (MWCNTs) has been achieved by a solution method. A heated bubble chamber is used as a hydrocarbon source from liquid n-hexane, and a Fe catalyst precursor is prepared by Fe(CO)5 which is dissolved into the n-hexane. The temperature and dissolved Fe concentration in the n-hexane have influences on the synthesis of MWCNTs. The synthesized MWNTs are collected by an electromagnet. SEM shows the diameters of MWNTs are in the range of 20-60 nm and are several micrometres in length.
Continuous mass production system of carbon nanotubes synthesis and processing
Dae-Sup So,Heon Ham,최봉근,심광보,김우식,방신영,이해원 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.1
High purity multiwall carbon nanotubes (MWCNTs) were synthesized by a continuous mass production apparatus using a catalyst vapor deposition method. The continuous mass production apparatus consisted of a moving heater and a gas decomposer, and this continuous mass production apparatus of carbon nanotubes shows the possibility of industrial scale production of carbon nanotubes. The MWNTs have lengths of several micrometres and diameters in the range of 20 to 60 nm with over 90% purity, a straight and smooth structure. Their Raman spectrum shows two strong peaks at 1569 and 1334 cm−1.
Ban, Jung Ok,Kim, Dae Hwan,Lee, Hee Pom,Hwang, Chul Ju,Shim, Jung-Hyun,Kim, Dae Joong,Kim, Tae Myoung,Jeong, Heon-Sang,Nah, Seong Su,Chen, Hanyong,Dong, Zigang,Ham, Young Wan,Kim, Youngsoo,Han, Sang-B Wiley (Blackwell Publishing) 2014 British journal of pharmacology Vol.171 No.11
<P>Products of Maillard reactions between aminoacids and reducing sugars are known to have anti-inflammatory properties. Here we have assessed the anti-arthritis effects of (E)-2,4-bis(p-hydroxyphenyl)-2-butenal and its possible mechanisms of action.</P>
김동준(Kim, Dong Jun),함대헌(Ham, Dae Heon),최종수(Choi, Jong Soo),이정민(Lee, Jung Min),이정호(Lee Jung Ho) 한국방재학회 2020 한국방재학회논문집 Vol.20 No.6
일정 규모 이상의 공공건축물에 대하여 빗물저류조의 설치는 의무화 되어있으나, 빗물저류조의 용량 결정에 관한 기준은부처별, 기관별로 상이하고, 동일 기관 내에서도 통일되지 않은 다양한 기준이 적용되는 경우가 많다. 또한, 빗물저류조는일반적으로 Benefit-Cost ratio (B/C)가 낮게 산정되어 경제성 측면에서는 부정적인 평가를 받고 있다. 따라서 본 연구에서는빗물저류조에 대한 기존의 비표준적인 용량 기준 문제를 개선하고, 보다 효율적인 용량 결정 방안을 제시하고자 하였다. 이를 위해 본 연구에서는 빗물저류조의 실사용 측면에서의 효용성을 고려하고자 물수지 분석을 통한 편익 산정 및 저류조용량 결정 방안을 제시하였다. 실증 분석은 토지주택연구원 내 빗물저류조를 대상으로 하였으며, 대전광역시의 2019년 실제강우 자료를 바탕으로 물수지 분석을 수행하였다. 그리고 빗물저류조의 편익 평가요소들로는 우수유출 저감, 폭염 저감, 미세먼지 저감, 조경 용수 사용 등을 선정하였다. 또한, 편익 분석은 저류조 용량 및 집수면적별로 이루어졌으며, 이에 따른빗물저류조 최적 용량 결정을 위한 가이드를 제시하였다. The installation of rainwater storage facilities is mandatory for public buildings over a certain size. However, the standards for determining the capacity of rainwater storage facilities vary by ministries and agencies. Even within the same institution, various unifying standards are often applied. In addition, rainwater storage facilities generally have a low B/C (Benefit-Cost ratio), which is negatively evaluated in terms of economy. Therefore, this study sought to improve the existing non-standard capacity reference problem for rainwater storage facilities and to suggest more efficient capacity determination measures. To this end, the study proposed a plan for calculating the benefits and determining the capacity of the reservoir through the analysis of the water balance in order to take into account the utility of the rainwater reservoir in terms of actual use. The empirical analysis was conducted on rainwater storage facilities in the Korea Land and Housing Institute, and the water balance analysis was conducted based on the actual rainfall data of 2019 by Daejeon Metropolitan City. Among the factors to evaluate the benefit and cost of rainwater storage facilities were the reduction of rainwater runoff, reduction of heat waves, reduction of fine dust, and use of landscaping water. In addition, the benefit analysis was conducted by the reservoir capacity and collection area, and the guide for determining the optimum capacity of the rainwater reservoir was presented accordingly.
황석환,함대헌,Hwang. Seok Hwan,Ham. Dae Heon 한국방재학회 2013 한국방재학회논문집 Vol.13 No.5
본 연구에서는 기상청 관측망을 대상으로 지역별 정량적 관측망 취약성 분석을 실시하였다. 이를 위해 기상청 관측망 만을 이용하여 생산한 격자 자료 GRD(K)와 기상청과 국토교통부 관측망을 모두 사용하여 생산한 격자자료 GRD(A)의 강수량 차이를 비교하여 보았다. 격자자료 산정은 다중이차내삽법(Multi-quadric interpolation method; MQI)을 사용하였다. 도식적 분석으로 관측밀도와 정량적 분석으로 유역평균 강수량을 비교하였다. 비교 결과, 상대편차(GRD(A)의 중권역별 유역평균 강수량 대비 GRD(K)의 중권역별 유역평균 강수량 비)가 큰 지역들은 대략 동쪽의 주왕산에서 가야산, 덕유산, 내장산을 거쳐 서쪽의 월출산에 이르는 축을 기준으로 남쪽에 위치하고 있었고, 중심부의 덕유산에서 지리산에 이르는 남북축을 기준으로 평균적으로 GRD(K)가 GRD(A)보다 크게 산정되는 서쪽 지역과 GRD(K)가 GRD(A)보다 작게 산정되는 동쪽 지역으로 구분되었다. 즉, 소백산맥과 노령산맥 주변 및 이남지역이 GRD(K)와 GRD(A)의 차이가 큰 것으로 나타나 기상청 관측망 만을 이용할 경우 취약지역으로 평가되었다. This research was conducted to analyze the quantitative vulnerability of spatial estimation of precipitation for precipitation observation network of Korea Meteorological Administration (KMA). We compared the amount of precipitation of GRD(K) which were gridded data only using KMA`s observation network and GRD(A) which were gridded data using both KMA and Ministry of Land, Infrastructure and Transport (MLIT)`s observation network. we used a multi-quadric interpolation method(MQI) to make a gridded data. We compared the observation densities as a schematic analysis and areal precipitation as a quantitative analysis. As a result, regions where the relative deviations (GRD(K) compared to GRD(A)) are large were located at south of the axis which lines across from Mt. Juwang, Gaya, Deokyu and Mt. Naejang at east to Mt. Wolchool at west. In addition, based on north and south axis which lines across Mt. Deokyu at mid region of South Korea to Mt. Jiri, areas were separated into west regions where GRD(K) were estimated to be bigger than GRD(A) and east regions where GRD(K) were estimated to be smaller than GRD(A). In other words, GDR(K) and GRD(A) showed the biggest gap in regions near or southern the Sobaek mountain range and the Noryung mountain range. Thus, these areas were evaluated as the most vulnerable in case of using KMA`s observation network only.