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      • KCI등재

        Corrosion Behavior of Hastelloy C-276 for Carbon-anode-based Oxide Reduction Applications

        Min,Ku,Jeon,Sung-Wook,Kim,Eun-Young,Choi 한국방사성폐기물학회 2020 방사성폐기물학회지 Vol.18 No.3

        The corrosion behavior of Hastelloy C-276 was investigated to identify its applicability for carbon-anode-based oxide reduction (OR), in which Cl2 and O2 are simultaneously evolved at the anode. Under a 30 mL·min-1 Cl2 + 170 mL·min-1 Ar flow, the corrosion rate was less than 1 g·m-2·h-1 up to 500℃, whereas the rate increased exponentially from 500 to 700℃. The effects of the Cl2-O2 composition on the corrosion rate at flow rates of 30 mL·min-1 Cl2, 20 mL·min-1 Cl2 + 10 mL·min-1 O2, and 10 mL·min-1 Cl2 + 20 mL·min-1 O2 with a constant 170 mL·min-1 Ar flow rate at 600℃ was analyzed. Based on the data from an 8 h reaction, the fastest corrosion rate was observed for the 20 mL·min-1 Cl2 + 10 mL·min-1 O2 case, followed by 30 mL·min-1 Cl2 and 10 mL·min-1 Cl2 + 20 mL·min-1 O2. The effects of the chlorine flow rate on the corrosion rate were negligible within the 5–30 mL·min-1 range. A surface morphology analysis revealed the formation of vertical scratches in specimens that reacted under the Cl2-O2 mixed gas condition.

      • KCI등재

        Corrosion Behavior of Hastelloy C-276 for Carbon-anode-based Oxide Reduction Applications

        Jeon,,Min,Ku,Kim,,Sung-Wook,Choi,,Eun-Young Korean Radioactive Waste Society 2020 방사성폐기물학회지 Vol.18 No.3

        The corrosion behavior of Hastelloy C-276 was investigated to identify its applicability for carbon-anode-based oxide reduction (OR), in which Cl<sub>2</sub> and O<sub>2</sub> are simultaneously evolved at the anode. Under a 30 mL·min<sup>-1</sup> Cl<sub>2</sub> + 170 mL·min<sup>-1</sup> Ar flow, the corrosion rate was less than 1 g·m<sup>-2</sup>·h<sup>-1</sup> up to 500℃, whereas the rate increased exponentially from 500 to 700℃. The effects of the Cl<sub>2</sub>-O<sub>2</sub> composition on the corrosion rate at flow rates of 30 mL·min<sup>-1</sup> Cl<sub>2</sub>, 20 mL·min<sup>-1</sup> Cl<sub>2</sub> + 10 mL·min<sup>-1</sup> O<sub>2</sub>, and 10 mL·min<sup>-1</sup> Cl<sub>2</sub> + 20 mL·min<sup>-1</sup> O<sub>2</sub> with a constant 170 mL·min<sup>-1</sup> Ar flow rate at 600℃ was analyzed. Based on the data from an 8 h reaction, the fastest corrosion rate was observed for the 20 mL·min<sup>-1</sup> Cl<sub>2</sub> + 10 mL·min<sup>-1</sup> O<sub>2</sub> case, followed by 30 mL·min<sup>-1</sup> Cl<sub>2</sub> and 10 mL·min<sup>-1</sup> Cl<sub>2</sub> + 20 mL·min<sup>-1</sup> O<sub>2</sub>. The effects of the chlorine flow rate on the corrosion rate were negligible within the 5-30 mL·min<sup>-1</sup> range. A surface morphology analysis revealed the formation of vertical scratches in specimens that reacted under the Cl<sub>2</sub>-O<sub>2</sub> mixed gas condition.

      • SCOPUSKCI등재

        Ultrasonic Degradation of Endocrine Disrupting Compounds in Seawater and Brackish Water

        So,Young,Park,Jong,Sung,Park,Ha,Yoon,Lee,Ji,Yong,Heo,Yeo,Min,Yoon,Kyung,Ho,Choi,Nam,Guk,Her 대한환경공학회 2011 Environmental Engineering Research Vol.16 No.3

        In this study, a series of experiments was conducted on the relative degradation of commonly known endocrine-disrupting compounds such as bisphenol A (BPA) and 17α-ethinyl estradiol (Ee₂) in a single-component aqueous solution using 28 and 580 kHz ultrasonic reactors. The experiments were conducted with three different types of model water: deionized water (DI), synthetic brackish water (SBW), and synthetic seawater (SSW) at pH 4, 7.5, and 11 in the presence of inert glass beads and humic acids. Significantly higher sonochemical degradation (93-97% for BPA) occurred at 580 kHz than at 28 kHz (43-61% for BPA), regardless of water type. A slightly higher degradation was observed for Ee₂ compared to that of BPA. The degradation rate of BPA and Ee₂ in DI water, SBW, and SSW after 30 min of ultrasound irradiation at 580 kHz increased slightly with the increase in pH from 4 (0.073-0.091 min-1 for BPA and 0.081-0.094 min-1 for Ee₂) to 7.5 (0.087-0.114 min-1 for BPA and 0.092?0.124 min-1 for Ee₂). In contrast, significant degradation was observed at pH 11 (0.149-0.221 min-1 for BPA and 0.147-0.228 min-1 for Ee₂). For the given frequencies of 28 and 580 kHz, the degradation rate increased in the presence of glass beads (0.1 mm and 25 g) for both BPA and Ee₂: 0.018-0.107 min-1 without beads and 0.052-0.142 min-1 with beads for BPA; 0.021-0.111 min-1 without beads and 0.054-0.136 min-1 with beads for Ee₂. A slight increase in degradation of both BPA and Ee₂ was found as the concentration of dissolved organic carbon (DOC, humic acids) increased in both SBW and SSW: 0.107-0.115 min-1 in SBW and 0.087-0.101 min-1 in SSW for BPA; 0.111-0.111 min-1 in SWB and 0.092-0.105 min-1 in SSW for Ee₂. After 30 min of sonicating the humic acid solution, DOC removal varied depending on the water type: 27% (3 mg L-1) and 7% (10 mg L-1) in SBW and 7% (3 mg L-1) and 4% (10 mg L-1) in SSW.

      • SCOPUSKCI등재

        Ultrasonic Degradation of Endocrine Disrupting Compounds in Seawater and Brackish Water

        Park,,So-Young,Park,,Jong-Sung,Lee,,Ha-Yoon,Heo,,Ji-Yong,Yoon,,Yeo-Min,Choi,,Kyung-Ho,Her,,Nam-Guk Korean Society of Environmental Engineers 2011 Environmental Engineering Research Vol.16 No.3

        In this study, a series of experiments was conducted on the relative degradation of commonly known endocrine-disrupting compounds such as bisphenol A (BPA) and $17{\alpha}$-ethinyl estradiol (EE2) in a single-component aqueous solution using 28 and 580 kHz ultrasonic reactors. The experiments were conducted with three different types of model water: deionized water (DI), synthetic brackish water (SBW), and synthetic seawater (SSW) at pH 4, 7.5, and 11 in the presence of inert glass beads and humic acids. Significantly higher sonochemical degradation (93-97% for BPA) occurred at 580 kHz than at 28 kHz (43-61% for BPA), regardless of water type. A slightly higher degradation was observed for EE2 compared to that of BPA. The degradation rate of BPA and EE2 in DI water, SBW, and SSW after 30 min of ultrasound irradiation at 580 kHz increased slightly with the increase in pH from 4 (0.073-0.091 $min^{-1}$ for BPA and 0.081-0.094 $min^{-1}$ for EE2) to 7.5 (0.087-0.114 $min^{-1}$ for BPA and 0.092-0.124 $min^{-1}$ for EE2). In contrast, significant degradation was observed at pH 11 (0.149-0.221 $min^{-1}$ for BPA and 0.147-0.228 $min^{-1}$ for EE2). For the given frequencies of 28 and 580 kHz, the degradation rate increased in the presence of glass beads (0.1 mm and 25 g) for both BPA and EE2: 0.018-0.107 $min^{-1}$ without beads and 0.052-0.142 $min^{-1}$ with beads for BPA; 0.021-0.111 $min^{-1}$ without beads and 0.054-0.136 $min^{-1}$ with beads for EE2. A slight increase in degradation of both BPA and EE2 was found as the concentration of dissolved organic carbon (DOC, humic acids) increased in both SBW and SSW: 0.107-0.115 $min^{-1}$ in SBW and 0.087-0.101 $min^{-1}$ in SSW for BPA; 0.111-0.111 $min^{-1}$ in SWB and 0.092-0.105 $min^{-1}$ in SSW for EE2. After 30 min of sonicating the humic acid solution, DOC removal varied depending on the water type: 27% (3 mg $L^{-1}$) and 7% (10 mg $L^{-1}$) in SBW and 7% (3 mg $L^{-1}$) and 4% (10 mg $L^{-1}$) in SSW.

      • KCI등재

        신기능과 혈색소의 관계

        우학 ( Hak Woo ), 신민호 ( Min Ho Shin ), 김옥기 ( Ok Ki Kim ), 배우균 ( Woo Kyun Bae ), 조영욱 ( Young Wook Cho ), 이연경 ( Youn Kyoung Lee ), 마성권 ( Seong Kwon Ma ), 김수완 ( Soo Wan Kim ), 김남호 ( Nam Ho Kim ), 최기철 ( Ki Chul Choi) 대한내과학회 2007 대한내과학회지 Vol.72 No.2

        목적: 빈혈은 만성신질환 환자들에서 좌심실비대 등 건강에 여러 가지 악영향을 미치는 중요한 합병증 중의 하나이다. 기저질환에 관계없이 신기능의 악화에 따른 빈혈의 발생빈도, 혈색소 농도와 적혈구용적률의 변화 및 성별에 따른 차이를 알아보기 위해 이 연구를 시행하였다. 방법: 전남대학교병원 내과에서 치료하고 있는 환자들 중 남성 157명, 여성 132명의 의무기록을 후향적으로 분석하였다. MDRD 등식에 따라 추정 사구체여과율을 측정하고, 사구체여과율(GFR)이 90 mL/min/1.73 m2 이상을 기준(정상)으로 하여, 추정 사구체여과율이 10 mL/min/1.73 m2씩 감소함에 따라 9개 군으로 분류하여 기준과 비교하여 평균 혈색소 농도와 적혈구용적률이 통계학적으로 유의하게 감소하는 신기능의 범위를 찾아서 남성과 여성을 각각 비교하였다. 결과: 모든 대상 환자들은 기준치(추정 사구체여과율≥90 mL/min/1.73 m2)에 비해 추정 사구체여과율 50≤GFR<60 mL/min/1.73 m2에서 평균 혈색소 농도는 0.8 g/dL(p=0.021), 적혈구용적률은 2.6%(p=0.011)가 감소하였고, 신기능이 감소함에 따라 평균 혈색소 농도와 적혈구용적률은 더욱 유의하게 감소하였다(Hgb.: r=0.635, Hct.: r=0.640, p<0.001). 남성은 기준치에 비해 추정 사구체여과율 40≤GFR<50 mL/min/1.73 m2에서 평균 혈색소 농도는 1.7 g/dL(p<0.01), 적혈구용적률은 4.4%(p<0.01)가 감소하였고, 신기능이 감소함에 따라 평균 혈색소 농도와 적혈구용적률은 더욱 유의하게 감소하였다(Hgb.: r=0.69 8, Hct.: r=0.689, p<0.001). 여성은 기준치에 비해 추정 사구체여과율 60≤GFR<70 mL/min/1.73 m2에서 평균 혈색소 농도는 0.9 g/dL(p<0.01), 적혈구용적률은 2.8%(p<0.01)가 감소하였고, 신기능이 감소함에 따라 평균 혈색소 농도와 적혈구용적률은 더욱 유의하게 감소하였다(Hgb.: r=0.672, Hct.: r=0.687, p<0.001). 결론: 만성신질환 환자들에서 혈색소 농도와 적혈구용적률은 신기능이 감소함에 따라 점차 감소하였고 이것은 경증 내지 중등도 신기능 감소부터 관찰되었다. Background: The goal of this study is to define the relationship between the decreased renal function and anemia, and also to determine whether this relationship is different in male and female patients. Methods: We conducted a retrospective study of 289 patients (male:female=157:132) who were followed at the department of internal medicine at Chonnam National University Hospital. General linear models were used to analyze the relationship between the hemoglobin concentration and Modification of Diet in the Renal Disease formula estimated Glomerular Filtration Rate (mL/min/1.73 m2). Results: Among all patients, the mean hemoglobin concentration and hematocrit of the men with a Glomerular Filtration Rate of 50~59 mL/min/1.73 m2 was an absolute change of 0.8 g/dL (p=0.021) and it was 2.6% (p=0.011) lower than those of the patients with a Glomerular Filtration Rate≥90 mL/min/1.73 m2 and continued to decrease further as the Glomerular Filtration Rate decreased, respectively (Hgb.: r=0.635, Hct.: r=0.640, all p<0.001). Among the male patients, the mean hemoglobin concentration and the hematocrit of men with a Glomerular Filtration Rate of 40~49 mL/min/1.73 m2 was an absolute change of 1.7 g/dL (p<0.01) and it was 4.4% (p<0.01) lower than those of the male patients with a Glomerular Filtration Rate≥90 mL/min/1.73 m2 and continued decrease as the Glomerular Filtration Rate decreased, respectively (Hgb.: r=0.698, Hct.: r=0.689, all p<0.001). Among the female patients, the mean hemoglobin concentration with a Glomerular Filtration Rate of 60~69 mL/min/1.73 m2 was an absolute change of 0.9 g/dL (p<0.01) and the mean hematocrit was 2.8% (p<0.01) lower than those of the female patients with a Glomerular Filtration Rate ≥90 mL/min/1.73 m2 and continued to decrease further as the Glomerular Filtration Rate decreased, respectively (Hgb.: r=0.672, Hct.: r=0.687, all p<0.001). Conclusions: A decrease in the hemoglobin concentration was statistically significant in the patients of both genders, along with a moderately decreased Glomerular Filtration Rate (≤60 mL/min/1.73 m2). (Korean J Med 72:191-199, 2007)

      • KCI등재

        NMP로부터 제조된 Melt-blown흑연섬유의 안정화조건에 따른 미세구조와 전기화학적 특성

        김찬,양갑승,고장면,박상희,박호철,김영민,Kim,Chan,Yang,Kap,Seung,Ko,Jang,Myoun,Park,Sang,Hee,Park,Ho,Chul,Kim,Young-Min 한국전기화학회 2001 한국전기화학회지 Vol.4 No.3

        용융분사법으로 나프탈렌계 메조페이스 피치(mP)를 방사하여 산화안정화 속도를 변화시켜 흑연화 섬유의 모폴러지를 제어하였으며, 흑연화 섬유를 이용하여 Li-ion 이차전지 부극을 제조하여 충$\cdot$방전 거동 및 용량을 측정하였다. 용융분사조건에 따라 제조된 피치섬유의 직경은 $4{\mu}m$로부터 $16{\mu}m$까지 다양하였다 이중에서 직경 $10{\mu}m$인 피치섬유를 선택하여 세가지 승온속도 조건 $2^{\circ}C/min,\;5^{\circ}C/min,\;10^{\circ}/min$에서 산화안정화 후 $1000^{\circ}C$에서 탄소화하여 $2650^{\circ}C$에서 흑연화 한 결과, 섬유 단면이 산화안정화 조건 $2^{\circ}C/min$의 경우는 라디알 구조, $5^{\circ}C/min$의 것은 라디알-랜덤 구조, $10^{\circ}C/min$의 경우는 skin-core 구조를 형성하였고, 승온속도가 큰 경우일수록 이흑연화성이 컷다. 이것은 큰 승온속도에서는 탄소화$\cdot$흑연화 과정에서 섬유표면에서만 산화안정화가 일어나고, 내부에서는 피치분자가 유동성이 커 승온과정에서 고결정성의 흑연구조가 발달한 것으로 추측된다. 따라서 이흑연화성이 큰 $10^{\circ}C/min$에서 산화안정화 한 것이 충전방전 용량이 $2^{\circ}C/min$의 경우에 비해서 1.3배로 약 400mAh/g, 충방전 효율도 $96.8\%$로 가장 우수한 특성을 나타냈다. Naphthalene derived mesophase pitch WP) was spun into short fibers by using melt-blown technology. The pitch fibers oxidative stabilization were carried out heating rates of $2^{\circ}C/min,\;5^{\circ}C/min\;and\; 10^{\circ}/min$. The heating rate was a key factor to maximate the capacity of the Li-ion secondary battery through controlling the morphology of the graphitized fiber. The diameters of the melt-blown fibers prepared were in the range of $4{\mu}m\~16{\mu}m$ with functions of air jet speed, air temperature and the temperature of the nozzle. The graphitized fibers of $10{\mu}m$ diameters showed various morphological structure with heating rate of the stabilization. Radial, radial-random and skin-core cross-sectional structure of the fibers were observed at the respective heating rate of $2^{\circ}C/min\;5^{\circ}C/min\;and\;10^{\circ}C/min$. Most crystalline structure of graphite was obtained from the fiber stabilized at heating rate of $10^{\circ}C/min$ exhibiting the best anode performance with 400 mAh/g of capacitance and $96.8\%$ of charge/discharge efficiency.

      • KCI등재후보

        Original Paper : Effect of the supplementation of fructose and taurine on energy metabolism during exercise

        ( Young Min Kim ), ( Myoung Jei Chang ), ( Sung Keun Choi ) 한국운동영양학회 2012 Journal of exercise nutrition & biochemistry Vol.16 No.2

        The purpose of this thesis is to investigate whether taurine supplementation in combination with fructose improves both energy metabolism and exercise capacity. Eight collegiate female subjects were recruited for the study. Each subject went through threecross-over designs: control (fluid), fructose, and taurine plus fructose supplementation trials. Subjects received taurine supplementation 100 mg/kg a day for two weeks. After the supplementation, all subjects take 10% fructose at 15 min prior to exercise, immediately before exercise, and every 15 min during exercise. Subjects received 150 ml fluid as placebo during the same procedure. The subjects performed submaximal exercise at the exercise intensity of 60% for 45 min and then 80% of maximal oxygen uptake (VO2max) until exhaustion time, A 10ml blood sample was taken for measuring the level of glucose, ammonia, lactate, free fatty acids, and insulin every 15 min during exercise at 60% of VO2max. The blood glucose levels was significantly higher at 45 min and 50 min exercise after supplementation of fructose, and immediately before exercise and 50 min exercise after taurine plus fructose compared to the placebo trial. However, the values tended to be lower in taurine plus fructose supplementation compared to the fructose trial. The levels of both lactate and ammonia were significantly lower compared to the placebo, while the exhaustion time was significantly increased. The level of free-fatty acids was significantly lower at 30, 45, and 50 min after fructoseand fructose plus taurine supplementation compared to the placebo trial, The level of glucagon was significantly lower at 15, 30, 45, and 50 min after fructose and fructose plus taurine supplementation compared to the placebo trial, There was no differences in insulin concentration among three treatments. This thesis concludes that combined taurine and fructose supplementation prior to exercise may improve exercise tolerance time and energy metabolism, lowering the muscle fatigue factors such as lactate and ammonia.

      • KCI등재

        Corrosion Behavior of Inconel X-750 for Carbon Anode Oxide Reduction Application

        Min,Ku,Jeon,Sung-Wook,Kim,Sang-Kwon,Lee,Eun-Young,Choi 한국방사성폐기물학회 2020 방사성폐기물학회지 Vol.18 No.3

        The corrosion behavior of the Inconel X-750 alloy was investigated for its potential application under a Cl2-O2 mixed gas flow in an Ar atmosphere. The corrosion rate was found to be negligible at temperatures up to 400℃ under a flow rate of 30 mL·min-1 Cl2 + 170 mL·min-1 Ar, whereas an exponential increase was observed in the corrosion rate at temperatures greater than 500℃. The suppression of the corrosion reaction due to the presence of O2 was verified experimentally at flow rates of 30 mL·min-1 Cl2 (4.96 g·m-2·h-1), 20 mL·min-1 Cl2 + 10 mL·min-1 O2 (2.02 g·m-2·h-1), and 10 mL·min-1 Cl2 + 20 mL·min-1 O2 (1.34 g·m-2·h-1) under a constant Ar flow rate of 170 mL·min-1 at 600℃ for 8 h. The surface morphology analysis results revealed that porous surfaces with tunnel-type holes were produced under the Cl2-O2 mixed-gas condition. Furthermore, the effects of the Cl2 flow rate on the corrosion rate were investigated, indicating that its impact was negligible within the range of 5–30 mL·min-1 Cl2 at 600℃.

      • KCI등재

        Corrosion Behavior of Stainless Steel 316 for Carbon Anode Oxide Reduction Application

        Min,Ku,Jeon,Sung-Wook,Kim,Eun-Young,Choi 한국방사성폐기물학회 2020 방사성폐기물학회지 Vol.18 No.2

        Here, the stability of stainless steel 316 (SS-316) was investigated to identify its applicability in the oxide reduction process, as a component in related equipment, to produce a complicated gas mixture composed of O2 and Cl2 under an argon (Ar) atmosphere. The effects of the mixed gas composition were investigated at flow rates of 30 mL/min O2, 20 mL/min O2 + 10 mL/min Cl2, 10 mL/min O2 + 20 mL/ min Cl2, and 30 mL/min Cl2, each at 600℃, during a constant argon flow rate of 170 mL/min. It was found that the corrosion of SS-316 by the chlorine gas was suppressed by the presence of oxygen, while the reaction proceeded linearly with the reaction time regardless of gas composition. Surface observation results revealed an uneven surface with circular pits in the samples that were fed mixed gases. Thermodynamic calculations proposed the combination of Fe and Ni chlorination reactions as an explanation for this pit formation phenomenon. An exponential increase in the corrosion rate was observed with an increase in the reaction temperature in a range of 300 ~ 600℃ under a flow of 30 mL/min Cl2 + 170 mL/min Ar.

      • KCI등재

        Corrosion Behavior of Stainless Steel 316 for Carbon Anode Oxide Reduction Application

        Jeon,,Min,Ku,Kim,,Sung-Wook,Choi,,Eun-Young Korean Radioactive Waste Society 2020 방사성폐기물학회지 Vol.18 No.2

        Here, the stability of stainless steel 316 (SS-316) was investigated to identify its applicability in the oxide reduction process, as a component in related equipment, to produce a complicated gas mixture composed of O<sub>2</sub> and Cl<sub>2</sub> under an argon (Ar) atmosphere. The effects of the mixed gas composition were investigated at flow rates of 30 mL/min O<sub>2</sub>, 20 mL/min O<sub>2</sub> + 10 mL/min Cl<sub>2</sub>, 10 mL/min O<sub>2</sub> + 20 mL/min Cl<sub>2</sub>, and 30 mL/min Cl<sub>2</sub>, each at 600℃, during a constant argon flow rate of 170 mL/min. It was found that the corrosion of SS-316 by the chlorine gas was suppressed by the presence of oxygen, while the reaction proceeded linearly with the reaction time regardless of gas composition. Surface observation results revealed an uneven surface with circular pits in the samples that were fed mixed gases. Thermodynamic calculations proposed the combination of Fe and Ni chlorination reactions as an explanation for this pit formation phenomenon. An exponential increase in the corrosion rate was observed with an increase in the reaction temperature in a range of 300 ~ 600℃ under a flow of 30 mL/min Cl<sub>2</sub> + 170 mL/min Ar.

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