http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
황영기,방시욱 慶南大學校 附設 工業技術硏究所 1998 硏究論文集 Vol.15 No.3
Carmine-6B 아조염료 수용약을 양극산화시키는 전기분해반응에서 부반응이 없는 최소운전전압은 1.2V로, 산소발생에 따른 부가적인 산화작용을 고려한 최적운전전압은 20∼25V로 각각 조사되었다. 초기속도법으로 구한 분해반응치수는 0.68로 측정되었으며 반응속도는 전압상승에 따라 0.5승에 비례하였다. 물질전달계수는 pH에 무관하고 교반속도의 ⅓승에 비례 증가하였다. Decomposition of Carmine-6B azo dye has been performed by electrochemical oxidation. Minimum voltage for the reaction was found to be 1.2V. Oxygen evoluted on anode effected on the decomposition at the cell voltage as high as 20V or 25V. Initial reaction rate depended on both initial concentration with 0.68th order and cell voltage with 0.5th order. Mass transfer coefficient of azo dye was independent on pH of solution, but it was in proportion to its agitating speed by one third power .
Thermally driven homonuclear-stacking phase of MoS<sub>2</sub> through desulfurization
Hwang, Young Hun,Yun, Won Seok,Cha, Gi-Beom,Hong, Soon Cheol,Han, Sang Wook The Royal Society of Chemistry 2019 Nanoscale Vol.11 No.23
<P>Engineering phase transitions or finding new polymorphs offers tremendous opportunities for developing functional materials. We reveal that the thermally driven desulfurization of single-crystalline MoS2 samples improves transport properties by reducing the band gap and further induces metallization. Semi-desulfurization, <I>i.e.</I>, removal of the topmost S layer, results in the placement of the exposed Mo layers directly on top of the following sub-layers, together with the bottom S layer of the top layer. This homonuclear (AA) stacking derived from the AA′ stacking of the hexagonal (2H) phase is retained even after further desulfurization of the remaining bottom S layer, <I>i.e.</I>, full desulfurization of the top layer. Our findings fundamentally explain why the 2H phase of TMDs is characterized by AA′ stacking.</P>
( Wook Hyun Yeo ),( Eileen L. Yoon ),( Hyung Gi Bae ),( Yu Ri Hwang ),( Seong Eun Park ),( Jong Ho Lee ),( Ji Young Park ),( Jung Min Choi ),( Tae Joo Jeon ),( Won Chang Shin ),( Won-choong Choi ) 대한간학회 2016 춘·추계 학술대회 (KASL) Vol.2016 No.1
Aims: Prophylactic antibiotic use for spontaneous bacterial peritonitis or hepatic encephalopathy is common in decompensated cirrhotic patients with low level of ascitic protein and poor liver function. There is controversy whether prolonged antibiotic use is related with increased risk of bacterial infection other than SBP. We investigated whether the prophylactic use of rifaximin is associated with increased infection risk in cirrhotic patients. Methods: We reviewed the charts of 160 cirrhotic patients with acute variceal bleeding between 2009 and 2015 and compared the use rate of prophylactic rifaximin in infection group and non-infection group within 1, 3, and 6 months off-treatment. Results: Among 160 patients, 105 patients developed bacterial infection within a year follow-up. Ironically the rate of rifaximin use was higher in the infection group than non-infection group in 1, 3, 6 months off-treatment (p<0.001). MELD score were similar in both groups of patients. Prophylactic rifaximin was the only independent predictor of infection in 1 and 3 months off-treatment and odd ratios (OR) were 8.00/5.00 for 1month (p<0.001)/3months (p<0.001). Thrombocytopenia (OR 0.992, p=0.009) and rifaximin use (OR 2.963, p=0.002) were predictors of infection in 6 months off-treatment. However, types of infection were not significantly different between two groups. Conclusions: Prophylactic use of rifaximin after intravenous antibiotics in cirrhotic patients with acute variceal bleeding increased the risk of bacterial infections. Further study about gains & losses of prophylactic rifaximin are needed, especially in patients with various types of developed infection.
Molecular characterization of porcine <i>PGM1</i> gene associated with meat quality traits
Hwang, Jung Hye,Kwon, Seul Gi,Park, Da Hye,Kim, Tae Wan,Kang, Deok Gyeong,Ha, Jeongim,Kim, Sam Woong,Kim, Chul Wook Canadian Science Publishing 2015 Canadian journal of animal science Vol.95 No.1
<P> Hwang, J. H., Kwon, S. G., Park, D. H., Kim, T. W., Kang, D. G., Ha, J., Kim, S. W. and Kim, C. W. 2015. Molecular characterization of porcine PGM1 gene associated with meat quality traits. Can. J. Anim. Sci. 95: 31-36. The PGM1 gene from four porcine breeds (Berkshire, Duroc, Landrace, and Yorkshire) is highly expressed in liver tissue at the transcriptional level. Single nucleotide polymorphisms (SNPs) of PGM1 were examined to analyze association with increased expression of PGM1 gene in the Berkshire liver. A Leu525 synonymous SNP of Chr6:137174682A@@>@@G (c.1575A@@>@@G) was identified and showed significant (P@@<@@0.05) differences to backfat thickness, drip loss, protein content, fat content, Warner-Bratzler shear force, and post-mortem pH24h. Therefore, it is concluded that PGM1 synonymous SNP is an important factor regulating meat quality. </P>
Hwang, Tae-Yong,Lee, Jae-Wook,Lee, Sang-Min,Nam, Gi-Joon The Polymer Society of Korea 2009 Macromolecular Research Vol.17 No.2
The cure kinetics of the epoxy-layered, silicate nanocomposites were studied by differential scanning calorimetry under isothermal and dynamic conditions. The materials used in this study were o-cresol novolac epoxy resin and phenol novolac hardener, with organically modified layered silicates. Various kinetic parameters, including the reaction order, activation energy, and kinetic rate constants, were investigated, and the storage stability of the epoxy-layered silicate nanocomposites was measured. To synthesize the epoxy-layered silicate nanocomposites, the phenolic hardener underwent pre-intercalation by layered silicate. From the cure kinetics analyses, the organically modified layered silicate decreased the activation energy during cure reaction in the epoxy/phenolic hardener system. In addition, the storage stability of the nanocomposite with the pre-intercalated phenolic hardener was significantly increased compared to that of the nanocomposite with direct mixing of epoxy, phenolic hardener, and layered silicate. This was due to the protective effect of the reaction between onium ions and epoxide groups.
Gi-Un Seong,In-Wook Hwang,Shin-Kyo Chung 경북대학교 농업생명과학대학 2013 Current Research on Agriculture and Life Sciences Vol.31 No.4
To evaluate utilization of persimmon peels as novel bio-materials, the general composition and antioxidant activities of Daebong persimmon vinegar (DPV), Daebong persimmon peel vinegar (DPPV) and commercial persimmon vinegar (CPV) were investigated. The pH of DPPV had slightly higher than that of other vinegars. The titratable acidities of vinegars were 3.24% (DPV), 2.77% (DPPV) and 7.78% (CPV), respectively. The reducing sugar contents showed that DPV had slightly higher than that of other vinegars. The browning degree of DPV was lower than CPV in contrast to the turbidity. The results of Hunter’s color value have showed that overall values of CPV had significantly higher than DPPV and DPV. The total phenolic contents of DPV and CPV were 19.49 and 17.13 mg/100g GAE, respectively. The total flavonoid contents of DPPV (8.04 mg/100g CE) were two fold higher than that of DPV (3.85 mg/100g CE). The antioxidant activities, by DPPH and FRAP assays, of DPV showed stronger than those of other vinegars. Free sugars were mainly composed of fructose and glucose. Organic acids were presented in the order acetic acid, succinic acid, malic acid, tartaric acid, citric acid and oxalic acid. These results suggest that the Daebong persimmon peels could be utilized for vinegar production as a health-benefit material.
Hwang, Jung Hye,An, Sang Mi,Kwon, Seul Gi,Park, Da Hye,Kim, Tae Wan,Kang, Deok Gyung,Yu, Go Eun,Kim, Il-Suk,Park, Hwa Chun,Ha, Jeongim,Kim, Chul Wook Informa UK (TaylorFrancis) 2017 Animal biotechnology Vol.28 No.4
<P>Postmortem pH is a main factor influencing the meat quality in pigs. This study investigated the association of postmortem pH with single-nucleotide polymorphisms (SNPs) in the fourth member of the short-chain dehydrogenase/reductase family (DHRS4), the first member of serpin peptidase inhibitor, clade G (complement inhibitor) (SERPING1), and the apolipoprotein R precursor (APOR) genes in Berkshire pigs. The study included 437 pigs, and genotyping was conducted using the GoldenGate Assay (Illumina, San Diego, CA, USA). DHRS4, SERPING1, and APOR polymorphisms were significantly associated with pH(45) or pH(24) (p<0.05). SERPING1 was also statistically significantly associated with water holding capacity (p<0.05), which is closely associated with postmortem pH. These results suggest that SNPs in the DHRS4, SERPING1, and APOR genes have potential for use as genetic markers for the meat quality in pigs.</P>
Seong, Gi-Un,Hwang, In-Wook,Chung, Shin-Kyo Institute of Agricultural Science and Technology 2013 慶北大農學誌 Vol.31 No.4
To evaluate utilization of persimmon peels as novel bio-materials, the general composition and antioxidant activities of Daebong persimmon vinegar (DPV), Daebong persimmon peel vinegar (DPPV) and commercial persimmon vinegar (CPV) were investigated. The pH of DPPV had slightly higher than that of other vinegars. The titratable acidities of vinegars were 3.24% (DPV), 2.77% (DPPV) and 7.78% (CPV), respectively. The reducing sugar contents showed that DPV had slightly higher than that of other vinegars. The browning degree of DPV was lower than CPV in contrast to the turbidity. The results of Hunter's color value have showed that overall values of CPV had significantly higher than DPPV and DPV. The total phenolic contents of DPV and CPV were 19.49 and 17.13 mg/100g GAE, respectively. The total flavonoid contents of DPPV (8.04 mg/100g CE) were two fold higher than that of DPV (3.85 mg/100g CE). The antioxidant activities, by DPPH and FRAP assays, of DPV showed stronger than those of other vinegars. Free sugars were mainly composed of fructose and glucose. Organic acids were presented in the order acetic acid, succinic acid, malic acid, tartaric acid, citric acid and oxalic acid. These results suggest that the Daebong persimmon peels could be utilized for vinegar production as a health-benefit material.
Young Wook Hwang,Hyeon Gi Lee,원태영 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.10
In this paper, we report a theoretical study on the electrical-optical properties of phosphorescentorganic light-emitting diodes (PHOLEDs). Our simulation reveals that the refractive index of eachmaterial plays a crucial role in the emission characteristics and that the barrier height at the interfacesignificantly influences the behavior of charge transport as well as the generation of excitons. Thecalculated transient profiles indicate that the carrier recombination in the PHOLEDs takes placemainly at the interface between the emitting layer and the hole transport layer after 8 μs. In thecase of high index of refraction, the simulation result via modal analysis implies a possibility forimproving the light extraction by increasing the substrate mode. As the thickness of each layer hasbeen altered, we observe that the chromaticity of the device changes periodically.