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보문 : 청하향초(Tagetes minuta) 꽃과 줄기 추출물의 미백, 항주름 효과 및 항산화 활성
심성민 ( Sung Min Shim ),서수정 ( Soo Jung Seo ),김남우 ( Nam Woo Kim ) 대한미용학회(구 대한미용과학회) 2014 대한미용학회지 Vol.10 No.3
Tagetes minuta L., belonging to the Chrysanthemum family has anti-inflammatory, antibacterial or antimicrobial effect. It has been used as not only an ornamental plant but also for flavoring, coloring or as medical plants in foreign countries since a long time ago. This study was carried out to investigate effects of whitening and anti-wrinkling and antioxidant activities of flower and stem extracts of Tagetes minuta with water and ethanol. In the contents of total polyphenol and flavonoid compounds, ethanolic extract of flower (FRE) was the highest as 426.42 mg/g and 61.11 mg/g, respectively. In the electron donating ability, the water extract of flower (FRW) and water extract of stem (SRW) were 93.26% and 92.91%, respectively, at the concentration of 1.0 mg/mL. In the superoxide dismutase (SOD)-like activity, ethanolic extract of stem (SRE) was the highest as 62.53% and water extract of flower (FRW) was 61.92% at 1.0 mg/mL. In the nitrate scavenging ability, FRW was the highest as 93.18% and the SRW was 92.27% at pH 1.2 and 1.0 mg/mL. The tyrosinase inhibition activity of SRW was 25.45% and the collagenase inhibition activity of SRE was 45% at 1.0 mg/mL. The elastase inhibition activity of SRE was 46.73% at 1.0 mg/mL. These results suggest that the extract of T. minuta flower and stem could be used as anti-wrinkling agent and antioxidant resources for functional foodstuff, cosmetics and beauty industrial materials.
직접 가열방식의 가열로내 소재(Slab)의 온도 해석에 관한 연구
심성민(Sung-Min Shim),김영득(Young-Deuk Kim),강덕홍(Deok-Hong Kang),김우승(Woo-Seung Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In this study, numerical simulation has been performed by considering the convective and radiative heat transfer to predict the transient thermal behavior of the plate in directly-fired reheating furnace. The temperature profiles in the slab are determined by solving the transient one-dimensional heat conduction equation. The validity of the present results obtained from the transient analysis is verified by comparing the present results with the experimental data. Additionally, parametric investigations are performed to examine how the thermal behavior of the slab is affected by residence time, charging temperature and different slab materials.
디젤 배기 후처리에 대한 NH₃-SCR의 DeNOx 특성 해석
심성민(Sung-Min Shim),정희찬(Hee-Chan Jeong),김영득(Young-Deuk Kim),정수진(Soo-Jin Jeong),김우승(Woo-Seung Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In this study, the numerical investigation on the DeNOx characteristics of NH₃-SCR catalyst is performed. The various chemical reactions such as the standard-, NH₃ oxidation and NH₃ adsorption/desorption have been considered. The mathematical and chemical reaction kinetics models are also investigated to predict the performance of the selective catalytic reduction of NOx with ammonia over a vanadium-based SCR catalyst. In order to account for transport effects, the kinetics is coupled with a fully transient two-phase 1D+1D monolith channel model. The chemical reaction kinetics models are adopted to describe the unsteady- and steady-state kinetic behavior of the vanadium-based SCR catalyst. The reaction rate expressions are based on previously published literature and are modified to provide the best fits to experimental data. The mathematical and reaction kinetics models used in this study have been validated extensively with the experimental data over a wide range of reaction temperatures and operating conditions.
LNT의 기하학적 형상이 NOx 전환 효율에 미치는 영향에 대한 수치적 연구
심성민(Sung-Min Shim),김영득(Young-Deuk Kim),정수진(Soo-Jin Jeong),김우승(Woo-Seong Kim) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The lean NOx trap (LNT) is one of the promising technologies for the NOx reduction of gasoline lean bum and diesel engines to meet more stringent future emission regulations such as EURO 5 or 6. The adsorption sites in the wash coat take up NOx from engine exhaust gas during the lean condition and store NOx as nitrates. After running at the lean condition for a period of time, LNT is operated under the rich condition for a few seconds. Therefore, adsorbed NOx is released from the BaO sites and then reduced on the Pt sites. In this paper, a one-dimensional two-phase model of an adsorptive catalytic monolith reactor has been used to predict the performance of LNT in terms of NOx and CO conversion efficiency. The parametric investigations are numerically performed to examine the effect of the volume of LNT with various lengths and cross-sectional areas, GHSV(Gas Hourly Space Velocity), and geometric parameters such as cell density and wall thickness on the performance of LNT. An increase of GHSV decreases the NOx and CO conversion efficiency.
디젤엔진의 NO<SUB>x</SUB> 저감을 위한 SCR DeNO<SUB>x</SUB> 촉매의 정상 및 비정상 성능해석
김영득(Young-Deuk Kim),심성민(Sung-Min Shim),정수진(Soo-Jin Jeong),김우승(Woo-Seung Kim) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The steady- and unsteady-state kinetics of the selective catalytic reduction (SCR) of NOx with NH₃ has been investigated over a commercial V₂O?/TiO₂ catalyst. In order to account for the influence of transport effects the kinetics are coupled with a fully transient two-phase 1D+1D monolith channel model. The Langmuir-Hinshelwood (L-H) and Modified Redox (MR) mechanisms are adopted to describe the steady-state kinetic behavior of the V₂O?/TiO₂ catalyst, and their results are compared with each other. A Temkin-type kinetics is used to describe the ammonia adsorption/desorption rate. The reaction rate expressions are based on previously reported papers and are modified to fit the experimental data. The steady-state chemical reaction schemes used in the present mathematical model have been validated extensively with experimental data over a wide range of reaction temperatures.
슬랩의 균열도 향상과 연료 절감을 위한 직접가열식 가열로 내 온도 분포의 최적 설계
정의수(Eui-soo Jeong),심성민(Sung-Min Shim),김영득(Young-Deuk Kim),강덕홍(Deok-Hong Kang),김우승(Woo-Seung Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Since the reheating furnace consumes a large amount of energy to heat up the slabs, it is very important to find an optimal temperature patterns in the furnace for energy saving as well as uniform target temperature at the exit of the furnace. In this study, the temperature profiles in the slab are determined by solving the transient two-dimensional heat conduction equation in conjunction with boundary conditions with total heat exchange factors. The design of optimal temperature patterns is performed by using three optimization algorithms, which consist of a micro genetic algorithm (μ-GA), conjugated gradient method (CGM) and sequential linear programming (SLP), to identify the optimal results obtained from each algorithm. It can be seen that the consistent optimal results for each optimization algorithm are produced with the uniform target temperature of the slab and energy saving.
바나듐 계열 촉매를 통한 NOx의 NH₃-SCR에 관한 실험적 연구
정희찬(Hee-Chan Jeong),심성민(Sung-Min Shim),김영득(Young-Deuk Kim),정수진(Soo-Jin Jeong),김우승(Woo-Seung Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The deNOx characteristics of NH₃-SCR of NOx over a V-based catalyst are experimentally examined over a wide range of operating conditions, i.e., 170-590℃ and 30,000-50,000 h?¹, with a simulated diesel exhaust containing NH₃, NO, NO₂, O₂, H₂O, and N₂. The influence of the space velocity and oxygen concentration on the standard-SCR reaction is studied by varying these parameters from 30,000 to 50,000 h?¹ and from 2 to 10%, respectively. Low space velocity and high oxygen concentration promote the SCR activity by ammonia. The best deNOx efficiency is observed with a NO₂/NOx feed ratio of 0.5 because of an enhanced chemical activity induced by the fast-SCR reaction, while at the NO₂/NOx feed ratios above 0.5 the deNOx activity decreases due to the slow-SCR reaction. The oxidation of ammonia begins to take place at about 300℃ and the reaction products, such as N₂, NO, NO₂, N₂O, and H₂O, are produced by the undesirable oxidation reactions of ammonia, particularly in the high reaction temperature region above 450℃. Also, NO₂ decomposes to NO and O₂ at temperatures above 240℃. Therefore, NO₂ decomposition and ammonia oxidation reactions deteriorate significantly the SCR catalytic activity at high temperatures. To investigate the effect of water on the SCR reactions, the SCR catalyst has been examined under wet condition with water. In comparison to the dry condition without water, the presence of water in the feed gas decreases deNOx efficiency at low temperatures, while the NOx conversion at relatively high temperatures improves due to the effect of the competitive adsorption of water and ammonia over the catalyst.
직접 가열식 가열로 내 최적 분위기온도 분포 해석에 관한 연구
정의수(Eui-soo Jeong),심성민(Sung-Min Shim),김영득(Young-Deuk Kim),강덕홍(Deok-Hong Kang),김우승(Woo-Seung Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Because the reheating furnace consumes a large amount of energy to heat up the slabs, it is very important to find an optimal temperature patterns in the furnace for energy saving as well as uniform target temperature at the exit of the furnace. In this study, the temperature profiles in the slab are determined by solving the transient one-dimensional heat conduction equation in conjunction with boundary conditions with total heat exchange factors. The optimal temperature patterns are obtained to minimize the fuel consumption with satisfying the predetermined constraint conditions. The design optimization is performed by using a genetic algorithm and the optimal results are validated with results obtained from the PIDO tool, called as P.I.A.n.O.