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- 저자 : Lee Sunghoon (검색결과 766 건)
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Lee, Sunghoon,Binns, Michael,Lee, Jung Hyun,Moon, Jong-Ho,Yeo, Jeong-gu,Yeo, Yeong-Koo,Lee, Young Moo,Kim, Jin-Kuk Elsevier 2017 Journal of membrane science Vol.541 No.-
<P><B>Abstract</B></P> <P>Numerous membrane models have been developed and tested for the simulation of membrane processes. However, these models are often either simplified or only validated with a narrow range of experimental data. For the model-based process design of membrane systems it is necessary to have a validated and accurate model which is accurate for the range of possible operating conditions under consideration. Hence, in this study a modeling framework is developed for hollow fiber membranes which can be adjusted systematically to accurately predict the performance of a given membrane. Mixed-gas (CO<SUB>2</SUB>/O<SUB>2</SUB>/N<SUB>2</SUB> and CO<SUB>2</SUB>/N<SUB>2</SUB>) separation experiments are carried out over a range of different feed conditions to evaluate membrane performance and to provide reliable measurements of gas permeance. In particular the feed pressure (1–4bar), permeate pressure (0.1–0.5bar) and feed flow rates (0.096–0.4Nm<SUP>3</SUP>/h) are varied in these experiments (the ranges specified in brackets). Interpolation of these measured permeance allows for the accurate prediction of membrane performance at any conditions inside the measured range. A tanks-in-series modeling approach is employed here where the number of tanks (used to represent the membrane behavior in a numerical formulation) can be adjusted to calibrate and fit the membrane model to experimental results. For the membranes tested in this study it is found that using a relatively small number of tanks both minimizes the difference between model and experimental results and reduces the numerical complexity in the membrane model.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Experimental results of TR and XTR membrane modules. </LI> <LI> Effective membrane modeling via tuning the number of tanks in tanks-in-series model. </LI> <LI> Regression of membrane permeance data for accurate fitting of experimental results. </LI> <LI> Validation of the model through comparison with experimental results. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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요소수의 분무 특성과 관내 분무 거동에 관한 실험적 연구
이정구 ( Jungkoo Lee ),이창기 ( Changki Lee ),우승철 ( Seungchul Woo ),백승주 ( Seungju Beak ),이수홍 ( Soohong Lee ),박성훈 ( Sunghoon Park ),이기형 ( Kihyung Lee ) 한국액체미립화학회 2018 한국액체미립화학회 학술강연회 논문집 Vol.2018 No.-
As a method of reducing NOx in a diesel vehicle, lean NOx trap (LNT) and selective catalytic reduction (SCR) are mainly used. The Urea-SCR system has been evaluated as the best method of reducing NOx. In the Urea-SCR system, the urea water solution is injected at the upstream of the SCR catalyst. At this time, the urea water solution is hydrolyzed and decomposed into ammonia gas. The ammonia gas reacts with NOx in the SCR catalyst and NOx is converted to water and nitrogen. In order to improve the reduction efficiency, the SCR system should be optimized so that the urea water solution is completely converted to ammonia gas and has a high uniformity distribution. In this study, spray characteristics of urea water solution were analyzed through visualization using high speed camera under various test conditions. In addition, urea water solution was sprayed into a transparent exhaust pipe made with Pyrex tube to analyze spray behavior and wall-wetting phenomenon. In order to observe the influence of the exhaust pipe and the mixer shape, three types of transparent exhaust pipes and two types of SCR mixers were used.
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이일권(ILkwon Lee),국창호(Changho Kook),이정호(JeongHo Lee),함성훈(SungHoon Ham),이영숙(YoungSuk Lee),이승용(Seung Yong Lee) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
This paper is to study and analyze the change factor including with combustion engine to electric car. In recent, the fossil fuel that a great part of the energy source existence in the earth was brought on the global warming phenomenon endangering the survial of mankind. It was been at the end of one’s rope that a mankind had to change with the electric car for decreasing a CO2 from the emission gas in the vehicle. But for changing a electric car, the every nations in the world must devicefully resolve the reduced work problem and the derivation problem causing with decline of the petroleum consumption. Resulting do a survey for purchase reason of a electric car, the cost of fuel was investigated in the highest ratio of 56.5% in the survey. This is the most important factor for economical aspect like fuel expense reduction. To increase the electric car, the charge expense will be maintained with low price continuously. In the questionnaire survey analysis for the supply expansion of electric car, a charging station secure was investigated in the highest ratio of 44.7% in the survey. This can forecast to think more important the practical convience than the electric vehicle price and environmentfriendly awareness. The prospect of electric vehicle marcket is predicted that the car makers to live in heavy competition must quickly read the market situation and sales strategy in the world because of discrepancy reduction of technical between the conventional and new car makers.
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Sora Kim,Wonhoon Lee,Sunghoon Jung,Bong-Kyu Byun,Bong-Woo Lee,Seunghwan Lee 한국응용곤충학회 2010 한국응용곤충학회 학술대회논문집 Vol.2010 No.10
Systematic studies within the family Pterophoridae have been determined by external morpholgical characteristics (Yano 1963, Spuler 1910, Meyrick 1910). However, it is sometimes to be the result of species misplacement by the variation, depending on geographic isolation and genetic drift (Moran, 1986; Shufran et al., 2000; Anstead et al., 2002; Margaritopoulos et al., 2006). The genus Platyptilia Hübner [1925] is one of the largest genera of the family comprising more than 100 species according to the World’s Catalog by Gielis (2003) mainly distributed from Palaearctic and Afrotropical regions. Within the genus, Platyptilia ignifera has been suspected as very differentiated from other congeneric species in the morphological characters. In this study, to ascertain a placement of the species, we performed molecular analysis with one mitochondrial gene, COI and one nuclear gene, 28S, and morphometric analysis based on six ratios characters using principal components analysis (PCA). The sequences of the two genes, COI, 28S, implied that Platyptilia ignifera separated from Platyptilia spp. In addition, P. ignifera exhibited morphological characteristics distinct from other congeneric species. Based on these results, we propose that Neoplatyptilia gen. nov., for Platyptilia ignifera.
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Soybean molecular breeding platform based on variation blocks
Yul-Ho Kim,Hyang-Mi Park,Sunghoon Lee,Yu-Young Lee,Su Jeong Kim,Whang-Bae Sohn,Su-Young Hong,Jeong-Hwan Nam,Kibum Kweon,Jin-Cheol Jeong 한국육종학회 2015 한국육종학회 심포지엄 Vol.2015 No.07
Much effort has been expended to find agronomically important QTLs for improving soybean yield. However, the complexity of genome, such as genome duplication, limits the utility of genome-wide association studies and linkage analyses to identify genes controlling yield traits. We propose the variation block method, a three-step process for recombination block detection and comparison. The first step is to detect variations by comparing short-read DNA sequences of the cultivar to a reference genome of the target crop. Next, sequence blocks with variation patterns are examined and defined. The boundaries between the variation-containing sequence blocks are regarded as recombination sites. All the assumed recombination sites in the cultivar set are used to split the genomes, and the resulting sequence regions are named as variation blocks. The practicality of this approach was demonstrated by the identification of a putative locus determining soybean hilum color and known genes such as flower color gene. We suggest that the variation block method is an efficient genomics method for recombination block-level comparison of crop genomes. We expect that this method holds the prospect of developing crop genomics by bringing genomics technology to the field of crop breeding.
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Lee, Sunghoon,Binns, Michael,Kim, Jin-Kuk Elsevier 2018 Journal of membrane science Vol.563 No.-
<P><B>Abstract</B></P> <P>A systematic optimization framework is proposed with the aim to automate the design of multi-stage membrane processes for CO<SUB>2</SUB> capture from flue gas of a coal-fired power plant. This framework utilizes a superstructure approach to determine the optimal configuration of membrane systems and identify the most appropriate operating conditions in a holistic manner. Certain design specifications are satisfied through the use of penalty functions which are used in a Genetic Algorithm (GA) optimization method employed to identify design solutions at or near to the global optimal point. Sensitivity analysis is used to analyze multi-stage membrane designs to understand the effects of different structural and operating parameters on the economics of membrane-based carbon capture. As part of a case study the proposed design framework is applied to design membrane processes for the capture of CO<SUB>2</SUB> from a 600 MW<SUB>e</SUB> coal-fired power plant. Fixed membrane permeance and selectivity values are used to analyze sensitivities with respect to costing and structural design parameters. Additionally, the Robeson upper bound correlation between CO<SUB>2</SUB> permeance and CO<SUB>2</SUB>/N<SUB>2</SUB> selectivity is used within this framework to identify the optimal membrane properties which give economical separation of CO<SUB>2</SUB> and N<SUB>2</SUB>. It is found that membranes having at least 4000 GPU CO<SUB>2</SUB> permeance and over 50 of CO<SUB>2</SUB>/N<SUB>2</SUB> selectivity with a commercial available module gave the optimal performance and would be a good guideline for future membrane material development. Also, if different membrane properties are used in each stage (in a multi-stage configuration) then using a higher CO<SUB>2</SUB> permeance for the first stage (e.g. 6000 GPU CO<SUB>2</SUB> permeance and CO<SUB>2</SUB>/N<SUB>2</SUB> selectivity of 40) and higher selectivity membranes are used for subsequent downstream membrane stages (e.g. 1334 GPU CO<SUB>2</SUB> permeance and CO<SUB>2</SUB>/N<SUB>2</SUB> selectivity of 72) helps to reduce the electricity consumption and product purity which can reduce the overall cost of CO<SUB>2</SUB> capture.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Systematic process design framework for multi-stage membrane process. </LI> <LI> Superstructure-based optimization using Genetic Algorithm (GA). </LI> <LI> Identification of optimal membrane performance for multi-stage membrane network. </LI> <LI> Sensitivity analysis of the main design variables for membrane processes. </LI> </UL> </P>
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Comparison study of image quality and effective dose in dual energy chest digital tomosynthesis
Lee, Donghoon,Choi, Sunghoon,Lee, Haenghwa,Kim, Dohyeon,Choi, Seungyeon,Kim, Hee-Joung Elsevier 2018 Radiation physics and chemistry Vol.148 No.-
<P>The present study aimed to introduce a recently developed digital tomosynthesis system for the chest and describe the procedure for acquiring dual energy bone decomposed tomosynthesis images. Various beam quality and reconstruction algorithms were evaluated for acquiring dual energy chest digital tomosynthesis (CDT) images and the effective dose was calculated with ion chamber and Monte Carlo simulations. The results demonstrated that dual energy CDT improved visualization of the lung field by eliminating the bony structures. In addition, qualitative and quantitative image quality of dual energy CDT using iterative reconstruction was better than that with filtered backprojection (FBP) algorithm. The contrast-to-noise ratio and figure of merit values of dual energy CDT acquired with iterative reconstruction were three times better than those acquired with FBP reconstruction. The difference in the image quality according to the acquisition conditions was not noticeable, but the effective dose was significantly affected by the acquisition condition. The high energy acquisition condition using 130 kVp recorded a relatively high effective dose. We conclude that dual energy CDT has the potential to compensate for major problems in CDT due to decomposed bony structures, which induce significant artifacts. Although there are many variables in the clinical practice, our results regarding reconstruction algorithms and acquisition conditions may be used as the basis for clinical use of dual energy CDT imaging.</P>
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The performance of bioinspired valveless piezoelectric micropump with respect to viscosity change
Lee, Seung Chul,Hur, Sunghoon,Kang, Dooho,Kim, Bo Heum,Lee, Sang Joon IOP Publishing 2016 Bioinspiration & biomimetics Vol.11 No.3
<P>This study investigated the effect of the serial connection of two pumping chambers on transport of liquid with increased viscosity. A serially connected valveless piezoelectric micropump was fabricated inspired by the liquid-feeding strategy of a female mosquito drinking liquid with a wide range of viscosities, from nectar to blood. The performance of the micropump was investigated by varying the viscosity of working liquid. Results showed that the optimal phase difference between the two chambers was 180 degrees out-of-phase for all viscosity conditions. The two chambers operating at 180 degrees out-of-phase exhibited higher pumping performance compared with the sum of each single chamber solely actuated, when viscosity increased. The flow patterns in the micropump showed that the rectification efficiency improved with the increase in viscosity. Results indicated that the serially connected valveless piezoelectric micropump is more robust to the increase of viscosity than a single-chamber piezoelectric micropump. This study would be helpful in the design of microfluidic devices for transporting liquids with a wide range of viscosities.</P>
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Sunghoon Choi,Jung Jae Lee,Eunhye Lee,Min Ho Lee 대한신경손상학회 2023 Korean Journal of Neurotrauma Vol.19 No.2
The authors analyzed the characteristics of pediatric patients who visited trauma center due to injuries sustained while riding scooters and suggested recommendations on our concerns about pediatric scooter use.
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