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Stability of a Silica Membrane in the HI-$H_2O$ Gaseous Mixture
황갑진,박주식,이상호,최호상,HWANG Gab-Jin,PARK Chu-Sik,LEE Sang-Ho,Choi Ho-Sang The Membrane Society of Korea 2004 멤브레인 Vol.14 No.3
The stability of the prepared silica membrane by chemical vapor deposition (CVD) method in the HI-$H_2O$ gaseous mixture was evaluated aiming at the application for hydrogen iodide decomposition in the thermochemical IS process. Porous $\alpha$-alumina having pore size of 100 nm was modified by the different CVD temperature using tetraethoxysilane as the Si source. The CVD temperature was $700^{\circ}C$, $650^{\circ}C$, and $600^{\circ}C$. The $H_2$/H$_2$ selectivities of the modified membranes which were measured by single-component permeation experiment showed 43.2, 12.6, and 8.7 at $600^{\circ}C$ for the M1 (CVD temperature was $700^{\circ}C$), M2 (CVD temperature was $650^{\circ}C$) and M3 membranes (CVD temperature was $600^{\circ}C$), respectively. Stability experiment in the HI-$H_2O$ gaseous mixture was carried out at $450^{\circ}C$. The prepared silica membrane at $600^{\circ}C$ of CVD temperature was more stable than that at the other CVD temperature. 열화학적 IS 공정에서 요오드화수소의 분해에 적용하기 위하여 화학증착법(CVD)으로 제조된 silica 막의 안정성을 HI-$H_2O$ 기상 혼합물에서 평가하였다. Si 원천으로 tetraethoxysilane을 사용하여 서로 다른 CVD 온도로 기공크기가 100 nm인 $\alpha$-alumina를 처리하였다. CVD온도는 $700^{\circ}C$, $650^{\circ}C$, $600^{\circ}C$이었다. $600^{\circ}C$에서 수행한 단일 성분의 투과 실험에서 측정한 막의 $H_2$/$N_2$ 선택도는 CVD 온도 $700^{\circ}C$의 M1 막은 43.2, $650^{\circ}C$의 M2 막은 12.6, $600^{\circ}C$의 M3 막은 8.7을 나타내었다. HI-$H_2O$ 기상 혼합물에서 안정성 실험은 $450^{\circ}C$에서 수행하였는데, CVD 온도 $650^{\circ}C$에서 처리된 막이 다른 온도에서 처리된 막보다 더 안정성이 더 좋은 결과를 얻었다.
학생의 학교불신 원인에 관한 연구 - 민주화시기에 가정 및 학교 요인을 중심으로 -
황갑진 ( Kap Jin Hwang ) 한국사회과교육학회 2002 시민교육연구 Vol.34 No.2
The study aims to investigate to what extent students are satisfied with their school services and what factors cause their discontents. To fulfil the research purpose, this researcher distributed questionnaires to the secondary students enrolled in middle schools and high schools located in Jinju city. The analysis of the survey data revealed that, first, secondary students in Jinju city are very much dissatisfied with their schools` program designated to resolve their problems. Further, students perceive teachers and staffs` role as rather a watcher than a counsellor. Second, students` socio-economic background turned out to have no significant influence in increasing or decreasing discontent with the school service. Instead of the social class, the way of communication with parents have relatively stronger effects in dissolving discontent. Third, the most influential factor of explaining students` discontent with the school service is the failure of school system. While the social democratization since the 1990s has levelled up students expectation to the school education, especially in the way teachers and staffs manner of treating students, school culture is still tied up in the old tradition based on hierarchical relationship between faculties and students. The results of this study are somewhat different from the traditional explanation of students discontent of the school. According to the traditional perspective, student from families of the low social class are more likely to have discontent with the school system. However, this study focused on Korean students provides an alternative explanation that schools` organizational failure if adjusting to the social change is more important in explaining students discontent with the school education.
황갑진(Gab Jin Hwang),최호상(Ho Sang Choi),강안수(An Soo Kang),김종원(Jong Won Kim),소관훈(Kaoru Onuki) 한국공업화학회 2002 공업화학 Vol.13 No.6
원자력 발전의 고온 가스로(high temperature gas-cooled reactor, HTGR)의 냉각제로 사용되는 He가스의 폐열에너지를 이용하여 물을 분해해서 수소를 생산하는 열화학적 수소제조 IS프로세스에 대한 특성을 정리하였다. 폐사이클 연속 수소 생산 기술, 분리막 기술에 의한 프로세스 개선, 플랜트 설계를 위한 구성 재료에 관한 연구를 중점으로 정리하였다. 고온 원자력 열에너지를 열화학적 수소 제조법은 실현 가능한 단계까지 왔다고 생각되며, 아직 연구 개발 과제가 많이 남아 있지만, 미래의 청정 에너지 중의 하나인 수소를 대량 생산할 수 있는 가능성을 갖고 있다. This study summarized the properties of thermochemical water-splitting iodine-sulfur process for hydrogen production using the waste heat from the High Temperature Gas-Cooled Reactor (HTGR), recycling the heat of nuclear power. The summary was based on the research findings on closed-cycle contrinuous hydrogen productin techniques, the improvements of process with membrane separation techniques and studies on materials of plant construction. Although there still remain some problems to be resolved, the thermochemical water-splitting hydrogen production method using the high temperature nuclear thermal energy can be relaized in the near future. Thus, it is foreseeable that mass-production of hydrogen can be obtained and utilized as one of the clean energy sources in the future.
Supercapacitor용 이온성 액체 전해질의 전기화학적 특성
김상길,황갑진,김재철,유철휘,Kim, Sang-Gil,Hwang, Gab-Jin,Kim, Jae-Chul,Ryu, Cheol-Hwi 한국전기화학회 2011 한국전기화학회지 Vol.14 No.4
수퍼커패시터는 다양한 응용범위를 갖는 유망한 에너지 저장장치로서 활발히 연구되고 있으며, 에너지 밀도 향상을 위하여 이온성 액체의 적용이 필요하다. 본 연구에서는 4급화 반응과 음이온 교환반응을 거쳐 4급 imidazolium 염을 생성하는 반응으로 두 종류의 EMI-$BF_4$를 합성하였다. $^1H$-NMR을 통하여 EMI-$BF_4$의 합성을 확인하였고 TGA를 통하여 열적안정성을 확인하였으며, 이때 합성된 이온성 액체를 열처리한 경우 열적 안정성이 향상되었다. LSV를 통하여 본 연구에서 합성한 EMI-$BF_4$가 4 V 이상의 넓은 전위창을 가지고 있어, 기존의 전해질 대비 우수한 전기화학적 안정성을 가지고 있음을 확인하였다. 충방전 실험 결과 본 실험에서 합성한 이온성 액체를 상용화 제품과 비교한 경우 용량은 각각 0.067 F 및 0.073 F로 측정되었다. Supercapacitor has been studied actively as one of the most promising electrochemical energy storage system for a wide range of applications. To increase the energy density of supercapacitor, the introduction of ionic liquids is required. In this study, two types of EMI-$BF_4$ based on quaternary imidazolium salt were prepared with quaternary reaction and anion exchange. The structural characterization and thermal stability were analyzed by nuclear magnetic resonance($^1H$-NMR) and thermogravimetric analysis(TGA), respectively. Thermal stability of the EMI-$BF_4$ using TGA confirmed that, after heat treatment, the decomposition temperature of EMI-$BF_4$ was increased. Supercapacitors were fabricated with synthesized and commercial ionic liquids, and charge/discharge characteristics were also investigated. The capacity of supercapacitor, for synthesized and commercial EMI-$BF_4$ were determined to be 0.067 F and 0.073 F respectively, by means of charge/discharge test.
박주왕,유철휘,황갑진,Park, Joo-Wang,Ryu, Cheol-Hwi,Hwang, Gab-Jin 한국막학회 2021 멤브레인 Vol.31 No.4
알칼리 수전해용 격막으로 사용가능성을 평가하기 위해 5종류의 상용 음이온교환막의 열적안정성, 이온전도도, 내구성을 평가하였다. TGA (thermo-gravimetric analysis)로 분석한 열적안정성은 FAAM-PK-75와 FAAM-40 막이 다른 3종류의 AEM, AHO, AHA 막과 비교하여 좋은 성능을 보였다. 25℃와 80℃, 7 M KOH 수용액에서의 이온전도도는 AEM막이 다른 막과 비교하여 약 4~17배 높은 값을 보였다. 25℃, 7 M KOH 수용액에서 측정한 내구성은 FAAM-PK-75막이 다른 막과 비교하여 안정하였다. To evaluate the possibility as a separator in alkaline water electrolysis, the thermal stability, ion conductivity and durability of 5 commercially available anion exchange membranes were tested. The thermal stability of FAAM-PK-75 and FAAM-40 membrane analyzed by thermo-gravimetric analysis (TGA) showed good performance compared to the other three types of AEM, AHO, and AHA membrane. The ion conductivity of AEM membrane measured in 7 M KOH solution at 25℃ and 80℃ had a higher value of about 4~17 times compared to the other membranes. The durability of FAAM-PK-75 tested in 7 M KOH solution at 25℃ was high compared to the other membranes.
고온 수전해 전해질 막의 제막조건에 따른 미세구조 분석
최호상,손효석,황갑진,배기광,Choi, Ho-Sang,Son, Hyo-Seok,Hwang, Gab-Jin,Bae, Ki-Kwang 한국수소및신에너지학회 2006 한국수소 및 신에너지학회논문집 Vol.17 No.2
This study was carried out to analyze the microstructure characteristics of electrolyte membrane through XRD, SEM and AC impedance measurement for using in high temperature steam electrolysis(HTE). It was investigated that thermal stability and electric characteristics by sintering condition using dry and wet process, and confirmed growth of particle and density change by sintering temperature. The sintering temperature and behavior had an effect on the relative density of the ceramic and the average grain size. The more amount of dispersant in organic compound increase, the more the density increased. But the binder was shown opposite phenomenon. It was analyzed that electrolyte resistance and electrical characteristics using AC impedance. The electrical properties of YSZ grain boundary changed with the sintering temperature.