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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>
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.
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.
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.
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.
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.
Molecular phylogeny of the plant bugs (Heteroptera: Miridae with evolution of the feeding habits
Sunghoon Jung,Seunghwan Lee 한국응용곤충학회 2010 한국응용곤충학회 학술대회논문집 Vol.2010 No.10
We present the first comprehensive cladistic analysis of Miridae, the plant bugs, based on analysis of 3935 base pairs of mitochondrial (16S, COI) and nuclear (18S, 28SD3) DNA for 91 taxa in seven subfamilies. We analyzed the data using maximum likelihood (ML), maximum parsimony (MP), and Bayesian inference (BI) phylogenetic frameworks. A Bayesian relaxed molecular clock was used to examine divergence times, and ancestral feeding habits were reconstructed using parsimony and a Bayesian approach. Clades recovered in all analyses are as follows: Cimicomorpha, Miroidea, and Miridae; Bryocorinae: Bryocorini; Stenodemini; Mirinae; Deraeocorinae (Clevinemini + Deraeocorini); Cylapinae; Isometopinae; Bryocorinae: Dicyphini; Orthotylini; Phylinae (Phylini + Pilophorini), and Phylinae is sister-group to all the remaining mirid taxa. These results are largely congruent with former hypotheses based on morphological data with respect to the monophyly of various subfamilies and tribes however, our results indicate that the subfamily Bryocorinae is not a monophyletic group as the two tribes, Dicypini and Bryocorini, were separated in our phylogeny. Ancestral feeding state reconstructions based on Bayesian and parsimony inference were largely congruent and both reconstructed phytophagy at the root of the Miridae.
Sunghoon Jeon,Jaeyoung Jang,Gahyun Lee,Seungjo Park,Sang-kwon Lee,Hyunwook Kim,최지혜 대한수의학회 2020 Journal of Veterinary Science Vol.21 No.1
Blood perfusion of skeletal muscle and callus was evaluated using contrast-enhanced ultrasonography (CEUS) in a canine osteotomy model to determine the applicability of CEUS in the assessment of neovascularization during fracture healing and to compare the vascular signals on CEUS between external skeletal fixation and cast-applied dogs. In 6 Beagle dogs, a simple transverse osteotomy was performed at the left tibial shaft and external skeletal fixation (n = 3) or a cast (n = 3) was applied. Radiography, power Doppler ultrasonography (power Doppler), and CEUS were performed until complete union was achieved. On CEUS, vascular changes were quantitatively evaluated by measuring peak intensity (PI) and time to PI in the soft tissue and callus and by counting the vascular signals. Vascular signals from the soft tissue were detected on power Doppler and CEUS on day 2. Significantly more vascular signals were detected by CEUS than by power Doppler. On CEUS, PI in the surrounding soft tissue was markedly increased after the fracture line appeared indistinctively changed on radiography in all dogs. In the cast-applied dogs, vascular signals from the periosteal and endosteal callus were detected on CEUS before mineralized callus was observed on radiography. CEUS was useful in assessing the vascularity of soft tissue and callus, particularly in indirect fracture healing, and provided indications of a normally healing fracture.
Lee, Minji,Kim, Jong Hyun,Yoon, Ina,Lee, Chulho,Fallahi Sichani, Mohammad,Kang, Jong Soon,Kang, Jeonghyun,Guo, Min,Lee, Kang Young,Han, Gyoonhee,Kim, Sunghoon,Han, Jung Min National Academy of Sciences 2018 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.115 No.23
<P>A protein synthesis enzyme, leucyl-tRNA synthetase (LRS), serves as a leucine sensor for the mechanistic target of rapamycin complex 1 (mTORC1), which is a central effector for protein synthesis, metabolism, autophagy, and cell growth. However, its significance in mTORC1 signaling and cancer growth and its functional relationship with other suggested leucine signal mediators are not well-understood. Here we show the kinetics of the Rag GTPase cycle during leucine signaling and that LRS serves as an initiating 'ON' switch via GTP hydrolysis of RagD that drives the entire Rag GTPase cycle, whereas Sestrin2 functions as an 'OFF' switch by controlling GTP hydrolysis of RagB in the Rag GTPase-mTORC1 axis. The LRS-RagD axis showed a positive correlation with mTORC1 activity in cancer tissues and cells. The GTP-GDP cycle of the RagD-RagB pair, rather than the RagC-RagA pair, is critical for leucine-induced mTORC1 activation. The active RagD-RagB pair can overcome the absence of the RagC-RagA pair, but the opposite is not the case. This work suggests that the GTPase cycle of RagD-RagB coordinated by LRS and Sestrin2 is critical for controlling mTORC1 activation, and thus will extend the current understanding of the amino acidsensing mechanism.</P>