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Hangil Park,Jae-Hwan Choi,Kyeong Woo Bae,문성용 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-
Galactotriose (G3), which is contained in a crude galacto-oligosaccharides (GOS) mixture coming fromenzymatic transgalactosylation reactions, is known to have potential as a high-grade prebiotic ingredient. This has aroused an interest in the high-purity recovery of G3 from a crude GOS mixture, which includedmonosaccharides (galactose and glucose), disaccharides (G2), and GOS components with differentdegrees of polymerization (G3, G4, and G5). To settle this problem, we aimed to develop an efficientsimulated-moving-bed (SMB) process for high-purity recovery of G3 from the crude GOS mixture. Itwas found first that the appropriate column temperature and ionic form of the adopted adsorbent in considerationof both G3-G2 and G3-G4 resolutions were 65 C and K+ form respectively. Under such adsorbentconditions, the equilibrium constants and mass-transfer parameters of the crude mixturecomponents were determined and then exploited in the design of the G3-recovery SMB, which was carriedout with a priority focus on the stable maintenance of high purity for G3 product throughout the SMBoperation. The separation performance of such designed SMB was verified on the bases of the columnprofiles from simulations and the outlet-concentration data from the relevant SMB experiment. Overall, it was confirmed that the designed SMB could recover G3 from the crude GOS mixture in a continuousmode with a purity of more than 98.9% while keeping the overall loss of G3 below 7.3%.
Development of an Upper Limb Muscle Synergy Training Interface
Hangil Lee(이한길),Jeong-Ho Park(박정호),Hyung-Soon Park(박형순) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Recent studies show that stroke survivors often exhibit abnormal muscle synergy activation patterns. Restoring impaired muscle synergies may help rehabilitate impaired upper limb function. The objective of this study was to develop an upper limb muscle synergy training interface and test the feasibility of training new muscle synergies on healthy participants. A game was interfaced with a robot that can guide isokinetic movement while measuring endpoint force applied on a handle in six directions. A previously developed model estimated the endpoint force vector of a desired muscle synergy activation and was displayed on a monitor to provide an intuitive visual cue for training. Two healthy participants were trained to activate three muscle synergy patterns when reaching in each direction. Results confirmed the feasibility of training unfamiliar muscle synergy activations for healthy participants and provided insights for applying the training interface to the rehabilitation of impaired muscle synergies for stroke survivors.
Confirmation of the coexistence of two tautomers of 2-mercaptothiazoline on the Ge(100) surface
Park, Youngchan,Yang, Sena,Lee, Myungjin,Lim, Heeseon,Kim, Yaewon,Kim, Sehun,Lee, Hangil The Royal Society of Chemistry 2013 Physical chemistry chemical physics Vol.15 No.39
<P>We confirmed the coverage dependent variation of tautomers of 2-mercaptothiazoline (the thiolate and thione forms) adsorbed on the Ge(100) surface under UHV conditions by using HRXPS measurements in conjunction with the DFT calculation method, which was studied before only in aqueous systems. The C 1s, S 2p, and N 1s core-level spectra obtained using HRXPS revealed the simultaneous presence of two distinct adsorption structures in different proportions at both low (0.15 ML) and high (0.65 ML) coverages. Moreover, we modelled the adsorption structures and geometric configurations of the bond states of 2-mercaptothiazoline on the Ge(100) surface by using the DFT calculation method, and found that the S dative bonded structure is the most stable adsorption structure for the thione form of 2-mercaptothiazoline and that the S–H dissociated-N dative bonded structure is the most stable adsorption structure for the thiolate form.</P> <P>Graphic Abstract</P><P>We confirmed the coverage dependent variation of tautomers of 2-mercaptothiazoline (the thiolate and thione forms) adsorbed on the Ge(100) surface under UHV conditions by using HRXPS measurements in conjunction with the DFT calculation method, which was studied before only in aqueous systems. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cp52760c'> </P>
Park, Youngchan,Lee, Myungjin,Lee, Hangil WILEY‐VCH Verlag 2013 CHEMPHYSCHEM -WEINHEIM- Vol.14 No.11
<P><B>Abstract</B></P><P>We investigated the adsorption mechanism of homocysteine (HSCH<SUB>2</SUB>CH<SUB>2</SUB>CH(NH<SUB>2</SUB>)COOH) on the Ge(100) surface along with its electronic structures and adsorption geometries to determine the sequence of adsorption of this amino acid′s functional groups using core‐level photoemission spectroscopy (CLPES) in conjunction with density functional theory (DFT) calculations. We found that the “SH‐dissociated OH‐dissociated N‐dative‐bonded structure” and the “SH‐dissociated OH‐dissociation‐bonded structure” were preferred at a monolayer (ML) coverage of 0.30 (lower coverage) and 0.60 (higher coverage), respectively. The “SH‐dissociated OH‐dissociated N‐dative‐bonded structure” was the most stable structure. Moreover, we systematically confirmed the sequence of adsorption of the functional groups of the homocysteine molecule on the Ge(100) surface, which is thiol group (SH), carboxyl group (COOH), and amine group (NH<SUB>2</SUB>).</P>