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Jee, S.C.,Lee, H.J. North-Holland 2016 Fuzzy sets and systems Vol.297 No.-
<P>A direct discrete-time design methodology for the sampled-data fault detection and isolation (FDI) problem is proposed for a nonlinear system in Takagi-Sugeno form. The generalized observer scheme is adopted, accompanied by a bank of the sensors' number of observers. A sufficient condition to find observer and residual gains, based on an accessible approximate-rather than unavailable exact-discrete-time model is proposed in terms of matrix inequalities so that it exhibits H-/H-infinity performance and asymptotic stability. An algorithm involving a convex optimization is presented using the cone complementary linearization technique. We show that the FDI observer ensures (modified) H-/H-infinity performance and Lagrange stability, when it is connected to the actual nonlinear system. (C) 2015 Elsevier B. V. All rights reserved.</P>
Cloning, characterization and tissue expression of disk abalone (Haliotis discus discus) catalase
Ekanayake, P.M.,De Zoysa, M.,Kang, H.S.,Wan, Q.,Jee, Y.,Lee, Y.H.,Kim, S.J.,Lee, J. Academic Press 2008 FISH AND SHELLFISH IMMUNOLOGY Vol.24 No.3
Catalase is an antioxidant enzyme that plays a significant role in protection against oxidative stress by detoxification of hydrogen peroxide (H<SUB>2</SUB>O<SUB>2</SUB>). A gene coding for a putative catalase was isolated from the disk abalone (Haliotis discus discus) cDNA library and denoted as Ab-catalase. The full-length (2864bp) Ab-catalase cDNA contained 1,503bp open reading frame (ORF), encoding 501 amino acid residues with 56kDa predicted molecular weight. The deduced amino acid sequence of Ab-catalase has characteristic features of catalase family such as catalytic site motif (<SUP>61</SUP>FNRERIPERVVHAKGAG<SUP>77</SUP>), heme-ligand signature motif (<SUP>351</SUP>RLYSYSDT<SUP>358</SUP>), NADPH and heme binding residues. Phylogenetic and pairwise identity results indicated that Ab-catalase is more similar to scallop (Chlamys farreri) catalase with 80% amino acid identity except for other reported disk abalone catalase sequences. Constitutive Ab-catalase expression was detected in gill, mantle, gonad, hemocytes, abductor muscle and digestive tract in tissue specific manner. Ab-catalase mRNA was up-regulated in gill and digestive tract tissues for the first 3h post injection of H<SUB>2</SUB>O<SUB>2</SUB>, showing the inducible ability of abalone catalase against oxidative stress generated by H<SUB>2</SUB>O<SUB>2</SUB>. The purified recombinant catalase showed 30,000U/mg enzymatic activity against H<SUB>2</SUB>O<SUB>2</SUB> and biochemical properties of higher thermal stability and broad spectrum of pH. Our results suggest that abalone catalase may play an important role in regulating oxidative stress by scavenging H<SUB>2</SUB>O<SUB>2</SUB>.
Jee, J.E.,Kwak, C.H. Elsevier 2013 Inorganic Chemistry Communications Vol.33 No.-
A dimeric complex of [(tren)Ni(μ-Cl)<SUB>2</SUB>Ni(tren)](ClO<SUB>4</SUB>)<SUB>2</SUB> (1) and a polymeric complex of {[Fe(CN)<SUB>6</SUB>][Ni(tren)]<SUB>2</SUB>[Ni(tren)(H<SUB>2</SUB>O)]<SUB>2</SUB>}Cl<SUB>2</SUB>(ClO<SUB>4</SUB>)<SUB>2</SUB>.4H<SUB>2</SUB>O (2), are isolated from the reaction of potassium ferricyanide, nickel chloride and tren and their X-ray structures and magnetic properties were characterized. Two [Ni(tren)]<SUP>2+</SUP> units are linked through bis μ-Cl ligands forming dimeric structure of 1. In complex 2, there are two kinds of Ni(II) unit, terminal ([Ni(tren)(H<SUB>2</SUB>O)]<SUP>2+</SUP>) and bridged ([Ni(tren)]<SUP>2+</SUP>), and this bridged [Ni(tren)]<SUP>2+</SUP> units are linked with two different Fe(II) ions through μ-NC ligands forming one-dimensional polymeric rectangular chain. 1 shows a weak ferromagnetic coupling between two Ni(II) ions and 2 shows spin crossover in Fe(II) ion.
Transformation of dissolved organic matter by oxidative polymerization with horseradish peroxidase
Jee, S. H.,Kim, Y. J.,Ko, S. O. IWA Publishing 2010 Water Science & Technology Vol.62 No.2
<P>Dissolved organic matter (DOM) has significant influence on the transport and fate of contaminants in multiple phases and it has potential hazard by acting as a precursor of disinfection by-products in water supply. The changes in DOM characteristics, especially by oxidative polymerization might result in different behaviour in the interaction with many contaminants. The aim of this work was to verify the catalytic effects of peroxidase on oxidative polymerization of humic and fulvic substances by examination of the structural characteristics. Transformation of humic acid (HA) and fulvic acid (FA) by oxidative polymerization catalyzed by horseradish peroxidase and hydrogen peroxide were investigated. Size exclusion chromatography, excitation-emission matrices spectra (EEMs), synchronous fluorescence spectra, and infrared spectroscopy was used to evaluate the structural transformation of HA and FA. Molecular weight of HA and FA was continuously changed and their weight-average molecular weight (MWw) reached maximum after 8 h. The MWw of HA and FA were proportionally increased with a dosage of horseradish peroxidase and hydrogen peroxide, indicating that HA and FA was transformed into larger and complex molecules. Spectroscopic results indicated that HA and FA structure contains strong polycyclic aromatic structures with more aromatic rings and a higher degree of conjugation.</P>
Photoelectrochemical water splitting employing a tapered silicon nanohole array
Jung, J. Y.,Choi, M.,Zhou, K.,Li, X.,Jee, S. W.,Um, H. D.,Park, M. J.,Park, K. T.,Bang, J.,Lee, J. H. Royal Society of Chemistry 2014 Journal of Materials Chemistry A Vol.2 No.3
An effective photocathode adopting a tapered Si nanohole (SiNH) array has been developed for photoelectrochemical water splitting. The tapered feature of SiNH photocathodes resulted in a gradation of the refractive indices between Si and air, such that the mismatching of optical impedance was alleviated and light absorption was enhanced. Adjusting the depth of the SiNHs successfully simulated the number of dielectric layers, optimizing the destructive interference for an antireflective coating (ARC). Only a 200 nm-thin NH array was required to absorb similar to 96% of solar spectral irradiance for photoelectrochemical applications. This thickness also minimized the undesirable surface recombination loss. When compared to a similar system using a planar technology, the formation of NHs was observed to cause an increase in the optical bandgap. This could generate a surface-passivation effect, resulting in a lowering of dark current and an increase in photovoltage, which could be utilized for an anodic shift of the onset voltage. Due to the addition of tapered SiNHs, the photogenerated current was improved by similar to 30% (similar to 33 mA cm(-2)) compared to a planar counterpart (similar to 25 mA cm(-2)), while the overpotential required for H-2 evolution was reduced.
재생 불량성 빈혈 및 골수 이형성군 환자의 요중 Erythropoietin 활성도의 Bioassay
이봉휘,정문성,지영구,남홍우,송형운,한창순,한치화,박종원,김춘추,--,김창규 대한내과학회 1990 대한내과학회지 Vol.38 No.5
Erythropoietin, a glycoprotein hormone, has an important and well-established role in regulating the developement of RBCs from committed erythropoietic precussor. Its activity can be measured by bioassay or RIA. Recently, we investigated urinary erythropoietin activity in A. A. patients and MDS patients by bioassay and RIA. In bioassay, we used as 3H-thymidine incorperation method to BACB-C mouse spleen cell. Thereafter we compared urinary Epo. acitivity in each disease group and like to find out prognostic significance to be influenced. The results were summarized as follows; 1. The urinary Epo. activities of the A.A. and MDS groups were higher than those of the normal control gorup. and the urinary Epo. activities of the A.A. group showed a marked increase over those of the MDS group (105.5±81.6 vs 1.7±1.5). But the after immune modulation therapyu, urinary Epo. acitivities of the A.A. group markedly decreased to the normal value (105.5±81.6 vs 1.8±1.7, p<0.001). 2. Age and sex differences were not related with urinary Epo. activities in each goup. 3. The hematocrits of the A.A. group did not correlate with any the urinary Epo. acitivities, but an inverse correlation was found in the MDS group. 4. The urinary Epo. activities measured by RIA were higher than those measured by bioassay, but there was a close corrlation between the two methods(R=0. 8, p< 0.001).