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알칼리 전해액의 상호작용에 의한 Stainless Steel 주성분의 변화 분석
변창섭,임수곤,김수곤,최호상,신훈규,Byun, Chang-Sub,Lim, Soo-Gon,Kim, Su-Kon,Choi, Ho-Sang,Shin, Hoon-Kyu 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.7
In this paper, We studied the change of surface and variation of elements on both electrodes of hydrogen generator of alkaline electrolysis in use of FE-SEM and SIMS. We used the stainless steel 316(600 ${\mu}m$) as electrode in condition of 25%KOH, $60^{\circ}C$ Temperature. The results show that the intensity of elements (C, Si, P, S, Ti, Cr, Mn, Fe, Ni, Mo) of Positive Electrode are decreased as much as about $10^1{\sim}10^3 $than the original electrode. Thickness of Positive Electrode is decreased about 40 ${\mu}m$ after chemical reaction. The negative electrode, however, shows a slight variation in the intensity of elements (C, Si, P, Fe, Ni, Mn, Mo) but Change of thickness and surface' shape of electrode show nothing after chemical reaction. The change in thickness and variation of Stainless Steel 316 cause the lifetime of electrode to be shorted. We also observed hydrogen, oxygen, potassium in both electrodes. Especially, The potassium is increased in proportional with depth of positive electrode. this means the concentration of alkali solutions is changed. and so we have to supply alkaline solution to generator in order to produce same quantity of hydrogen gas continuously. we hope that this study gives a foundation to develop the electrode for hydrogen generator of alkaline electrolysis.
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변창섭,임수곤,김수곤,신훈규,Byun, Chang-Sub,Lim, Soo-Gon,Kim, Su-Kon,Shin, Hoon-Kyu 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.7
We investigated the variation of anion exchange membrane of hydrogen generator of alkaline electrolysis. We detected the variation of elements and change of anion exchange membrane using EDS and FE-SEM. We detected two different sites of membrane because of different structure of membrane. $Sp_1$ shows that the distribution ratio of C, O, Al is 98% very higher than $Sp_2$ of 78%. Especially, the main elements of STS316 which is P, S, Fe, Ni were more detected at $Sp_2$ than $Sp_1$. We think that this result depends on the structure of membrane. This also affect the resistance, lifetime of membrane and decrease the efficiency of hydrogen production. We hope that this article is a foundation of developing of hydrogen production technology.
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Hitachi 7600-110ⓡ 에 의한 Lipoprotein(a) 정량검사의 평가
차경호 ( Kyung Ho Cha ),김승희 ( Sung Hee Kim ),이인숙 ( In Suk Lee ),변창섭 ( Chang Sub Byun ),김덕진 ( Duk Jin Kim ) 대한임상검사과학회 2001 대한임상검사과학회지(KJCLS) Vol.33 No.2
Background : The Lipoprotein(a), [Lp(a)] is one of the atherogenic lipoproteins and it is known to be the independent risk factor on premature atherosclerosis and cardiovascular disease(CHD). It is an atherogenic lipoprotein that is assembled from a Low density lipoprotein(LDL). Traditional methods for measuring Lp(a) are ELISA and immuno electrophoresis. However these method have slow reaction and no easy work measurement for Lp(a). Recent1y, the development of specific and sensitive assays for Lp(a) using specific polyclonal antibodies for Lp(a) were done, including radioI1llmunoassay, nephelometric assay(NA), and turbidimetric I1llmunoassay(TIA). We evaluated the Hitachi76OO-1 1O (Hitachi Co., Japan) using the TIA [TAC-3 Test Lp(a) (MBL Co., Japan) ] in the measurement of LP(a) and compared. Its results to those of the one-step sandwich ELISA (IMMUNOZYM Lp(a): Immuno GMBH.Co., Germany) using nephelometer in order to replace the Hitachi 7600-110 for quantitative analysis of Lp(a). Methods : Lp(a) were measured by the Hitachi 7600-110 using TIA and the one-step sandwich ELISA using nephelometer in the sera from 60 patients. πle performance characteristics were evaluated, linearity, in comparison with one-step sandwich ELISA. A1so, precision were evaluated, three level pooled serum throughput following NCCLS evaluation protocols (EPlO-A).The reference range was determined by Hitachi 7600-110 from 120 hea1thy subjects. Results : When the Lp(a) value of 20.l514.91(mean, SD)mg/dL by the Hitachi7600-1 1O was compared with that of 26.31 19.01 (mean, SD)mg/dL by ELISA, coefficients of correlation of 0.9858 was obtained. The regression equation was Y(Hitachi76OO-1 1O)= 0.773x (ELISA)-O.l89(r=0.9858, n=6O). CVs of Lp(a) measured by Hitachi 7600-110 was 2.97% at 10. 85mgldL, 1.15% at 35.53mg.dL, and 1.32% at 68.l3mgldL. The precision was excellent in each group. The linearity was acceptable. The reference range in this study was 0-28.9mgldL Lp(a). a Conclusions πle Hitachi 76OO-1 1OVY using TIA compared with the one-step sandwich ELISA using Nephelometer, showed good coefficient of correlation and precision. Therefore the Hitachi 76OO-1 1O@ can replace the one-step sandwich ELISA for quantitative analysis of Lp(a)
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