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Seo, Yong Won,Hong, Woo Hi,Hong, Tae Hee 한국화학공학회 1999 Korean Journal of Chemical Engineering Vol.16 No.5
In this study, the feasibility of recovery. of lactic acid by batch reactive distillation using cation exchange resin as a catalyst was investigated. For the recovery of lactic acid, two reactions, esterification and hydrolysis, are involved and hence, an apparatus with two distillation columns was developed and operated in a batch mode to ensure enough residence time in the reboiler and column. The effects of operation variables such as catalyst loading, reactant mole ratio, feed concentration, type of alcohols and partial condenser temperature on the yield were studied. In this study, the reaction products of the esterification (methyl lactate and water) were distilled to the hydrolysis part to be recovered into pure lactic acid. The yield of lactic acid increased as catalyst loading in the esterification part increased and reactant mole ratio and feed lactic acid concentration decreased. Methanol as a reactant gave higher yield than any other alcohols. The yield of recovered lactic acid was as high as 90%. The yield of lactic acid was closely related to the boiling temperature of the reaction mixture in the esterification part.
A Study of Ergonomic Vehicle Design by DFSS Considering Driver Body Types
Tae Hyun Choi,Sang Yeol Seo,Jun Youb Shim,Won Seok Jeong 대한인간공학회 2011 대한인간공학회 학술대회논문집 Vol.2011 No.5
Objective: The aim of this study is to suggest ergonomic vehicle design method through optimization of driver's space about various driver body types (tall, middle, short) Background: Recently, many drivers consistently demand ergonomic factors as well as driving performance when they choose their vehicle. So, there have been a lot of efforts to improve habitability and comfortability through optimizing vehicle interior in advanced design stage. Method: The procedure of this study is as follows. (1)VOC: Driver's needs of vehicle interior system are collected to select the factors which determine driving posture. (2)QFD: The VOC is converted to engineering words to optimize driving posture in QFD stage. (3)Pugh: The pugh matrix is used to determine optimal concept based on the priority about vehicle interior items. (4)Robust Design: The robust design method is used to select the most compromised group of design factors to minimize discomfort level that is simulated by RAMSIS. And vehicle interior items are optimized to satisfy various body types in this process. Results: The result of optimization from robust design satisfy DFSS target except extremely tall body type (German man 95percentile). Conclusion: It is reasonable to use DFSS in package design stage for ergonomic vehicle. Application: The results of the vehicle design considering driver's body types can help to determine composition of vehicle interior systems and develop new vehicle.
Ruptured Aneurysm of the Ophthalmic Artery
Seo, Won-Duck,Hong, Dae-Young,Kim, Young-Don,Yeo, Hyung-Tae The Korean Neurosurgical Society 2006 Journal of Korean neurosurgical society Vol.40 No.2
Aneurysms arising from the ophthalmic artery itself are very rare compared with aneurysms originating from the bifurcation of the ophthalmic artery and carotid artery. There was only one reported case of a ruptured aneurysm of the ophthalmic artery itself. We discuss clinical significance of an aneurysm at this site, as well as the role of three dimentional image of multislice computed tomography angiogram[3D-image of MCTA] in determining the cause of subarachnoid hemorrhage[SAH].
Fatigue Crack Growth and Fracture behavior of Rail Steels
Seo, Jung Won,Kwon, Seok Jin,Lee, Dong Hyeong,Kwon, Sung Tae,Choi, Ha Yong The Korean Society for Railway 2012 International Journal of Railway Vol.5 No.3
Contact fatigue damages on the rail surface, such as head checks and squats are a growing problem. The fatigue cracks forming on the contact surface grow according to load and lubricating conditions and may end up breaking the rail. Rail fracture can be avoided by preventing the cracks from reaching the critical length. Therefore, the crack growth rate needs to be estimated precisely according to the conditions of the track and load to develop a maintenance plan against rail damages. Therefore, it is important to understand the mechanism of cracks initiation and growth on a rail due to repetitive rolling contact. In this study, we have investigated the crack growth behavior on the rail surface by using the twin-disc tests and the finite element analysis.
Superplastic Deformation of Defect-Free Au Nanowires via Coherent Twin Propagation
Seo, Jong-Hyun,Yoo, Youngdong,Park, Na-Young,Yoon, Sang-Won,Lee, Hyoban,Han, Sol,Lee, Seok-Woo,Seong, Tae-Yeon,Lee, Seung-Cheol,Lee, Kon-Bae,Cha, Pil-Ryung,Park, Harold S.,Kim, Bongsoo,Ahn, Jae-Pyoung American Chemical Society 2011 NANO LETTERS Vol.11 No.8
<P>We report that defect-free Au nanowires show superplasticity on tensile deformation. Evidences from high-resolution electron microscopes indicated that the plastic deformation proceeds layer-by-layer in an atomically coherent fashion to a long distance. Furthermore, the stress–strain curve provides full interpretation of the deformation. After initial superelastic deformation, the nanowire shows superplastic deformation induced by coherent twin propagation, completely reorientating the crystal from <110> to <100>. Uniquely well-disciplined and long-propagating atomic movements deduced here are ascribed to the superb crystallinity as well as the radial confinement of the Au nanowires.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2011/nalefd.2011.11.issue-8/nl2022306/production/images/medium/nl-2011-022306_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl2022306'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl2022306'>ACS Electronic Supporting Info</A></P>
Review on Molecular Biological Approaches to Investigate the Effect of Endurance Training
( Tae Beom Seo ),( Young Soo Kim ),( Sung Won Youn ),( Myung Jin Oh ),( Jin Hee Seo ),( Hae Chan Park ) 한국스포츠정책과학원(구 한국스포츠개발원) 2014 International Journal of Applied Sports Sciences Vol.26 No.2
The purpose of this study is to examine details of domestic and foreign papers that verified the effect of endurance training using molecular biological approaches and to investigate the directivity of molecular biological study, analytical technology and analytical factors for the analysis of training effects. Existing domestic and foreign papers on endurance training that investigated the effect of training based on molecular biological analysis of human beings were reviewed. In order to increase reliability of the selected papers and their compatibility with the purpose of this study, the papers were reclassified by a group of experts that consisted of physical education professors and doctors of exercise physiology. The final papers selected were studied for the change in hormones and enzymes through blood and muscular tissues based on study topic and trend analysis from a macroscopic perspective. Analytical methods used include western blot, RT-PCR, ELISA and immunohistochemistry of molecular biology. Analytical variables investigated / analyzed were ACE, ACTN, PPARs, UCP, mitochondrial DNA variant, creatine kinase, renin-angiotensin, AMPK for blood and COX, myosin binding protein C fast-type, glycogen phosphorylase, pyruvate kinase, GLUT, PPARs, and AMPK for muscle. Such molecular biological analytical techniques and variables should be widely used to provide 1) conditioning of professional athletes and life sports athletes, 2) analysis of training effect, and 3) scientific and future-oriented methods for health enhancement.
Modeling and Scheduling of Cyclic Shops with Time Window Constraints
Seo, Jeong-Won,Lee, Tae-Eog 한국경영과학회 2000 한국경영과학회 학술대회논문집 Vol.- No.2
A cyclic shop is a production system that repeatedly produces identical sets of jobs, called minimal part sets, in the same loading and processing sequence. We consider a version of cyclic shop where the operations are processed and unloaded within time limits, so called a time window. We model the shop using an event graph model, a class of Petri nets. To represent the time window constraint, we introduce places with negative time delays. From the shop modeling graph, we develop a linear system model based on the max- plus algebra and characterize the conditions on the existence of a stable schedule.
Seo, Se Won,Park, Sangbaek,Jeong, Hui-Yun,Kim, Sang Hyeon,Sim, Uk,Lee, Chan Woo,Nam, Ki Tae,Hong, Kug Sun The Royal Society of Chemistry 2012 Chemical communications Vol.48 No.84
<P>Photocatalytic activity of NaTaO<SUB>3</SUB> was significantly improved by using a molecular co-catalyst [Mo<SUB>3</SUB>S<SUB>4</SUB>]<SUP>4+</SUP>. Its hydrogen production rate is 28 times higher than pure NaTaO<SUB>3</SUB>. This study presents the potential of bioinspired molecular metal clusters as efficient co-catalysts.</P> <P>Graphic Abstract</P><P>Molecular co-catalyst [Mo<SUB>3</SUB>S<SUB>4</SUB>]<SUP>4+</SUP> loaded NaTaO<SUB>3</SUB> were developed by a facile impregnation method and its photocatalytic water splitting performance significantly increased. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc36216c'> </P>