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주용완(Ju, Young-Wan),김유정(Kim, Yoo-Jung),조찬형(Cho, Chang-Hyung) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.12
본 연구에서는 사회경제적 특성에 따라 인터넷 접근, 인터넷 이용 정도 및 인터넷 서비스 이용 상의 디지털 격차가 어떻게 달라지는가를 체계적으로 규명하고자 하였다. 이를 위해 본 연구에서는 한국인터넷진흥원의 인터넷이 용자실태조사 데이터를 이용하여 사회경제적 특성에 따른 인터넷 접근과 인터넷 이용(양적 이용 정도, 인터넷 서비스 이용)의 디지털 격차를 로지스틱 회귀분석방법으로 검증하였다. 분석결과, 인터넷 접속(가정에서의 인터넷 접속, 초고 속 인터넷 접속)과 인터넷 이용정도(적극적 이용, 정기적 이용, 비정기적 이용)는 연령, 성별, 교육수준, 고용상태, 소 득수준, 인터넷 접속 유형 등에 따라 디지털 격차가 존재하는 것으로 나타났다. 인터넷 서비스 이용(정보 활용, 커뮤 니케이션 및 커뮤니티, 전자상거래, 인터넷 뱅킹)의 경우 고학력자 및 고소득층이며, 학생이고 젊은 연령층일수록 인 터넷 서비스를 많이 활용하는 것으로 나타나 사회경제적 특성에 따른 인터넷 서비스 활용 격차가 존재하는 것으로 검증되었다. The purpose of this paper is to better understand the socio-economic differentials of Internet access and use. Data from '2008 Korean Internet usage behavior' were used to conduct logistic regression analysis. The findings show that there are significant socio-economic(age, gender, educational attainment, employment situation, and Internet access type) disparity in Internet access(Internet access at home, broadband Internet access). Also socio-economic variables enter in as statistically significant in most specifications for Internet use intensity (Intensive internet use, frequent internet use, less frequent internet use). The gender, household income and education attainment explanations for large differential in Internet use intensity are generally very similar. It is shown that age, education attainment and household income level cause a large digital divide on Internet service use(information use, communication and community use, e-commerce use, Internet banking use).
주용완(Young-Wan Ju) 한국세라믹학회 2021 세라미스트 Vol.24 No.4
Solid oxide fuel cells (SOFCs) have been attracting much attention as alternative energy conversion devices due to their high energy conversion efficiency and fuel flexibility. In current SOFCs, Ni-based Cermet anode, solid oxide electrolyte and ceramic cathode have been used. Since all components are ceramic-based materials, there is a problem in that mechanical strength and durability against thermal shock. In order to solve this problem, metal-supported solid oxide fuel cells have designed. Metal-supported solid oxide fuel cells provide significant advantages such as low materials cost, ruggedness, and tolerance to rapid thermal cycling and redox cycling. This paper review the types of metal supports used in metal-based solid oxide fuel cells and the advantages and disadvantages of each metal support.
Preparation of Electrode of MWCNT/PAN-Based Carbon Nanofiber Web Coated PPy for a Supercapacitor
Ju, Young-Wan,Choi, Gyoung-Rin,Jung, Hong-Ryun,Kim, Chan,Yang, Kap-Seung,Lee, Wan-Jin 한국공업화학회 2005 응용화학 Vol.9 No.1
At first, the mixed solution of both polyacrylonitrile (PAN) in N,N-dimethylformamide (DMF) and multi-walled carbon nanotube (MWCNT) was electrospun so as to make PAN-based nanocomposite fiber web. The electrospun PAN-based carbon nanofiber web was prepared by stabilizing at 280℃, and by activating at 800℃ in stea m atmosphere. Finally, the polypyrrole/MWCNT-carbon nanofiber composite web was prepared by polymerizing pyrrole to use Fecl₃.6H₂O as an oxidant on the carbon-MWCNT nanofiber. The electrodes of (1) bared carbon (2) MWCNT-carbon (3) PPy/carbon (4) PPy/CNT-carbon were prepared for a supercapacitor. Out of the electrodes, the electrochemical performance of 20 wt% polypyrrole /carbon-MWCNT composite nanofiber web electrode was the best as a value of 333F/g. This is because of the synergic effect of non-faradaic and faradaic mechanism.
Preparation of Manganese/PAN-based Carbon Nanofiber Web by Co-electrospinning
Choi, Gyoung-Rin,Ju, Young-Wan,Jung, Hong-Ryun,Kim, Chan,Yang, Kap-Seung,Lee, Wan-Jin 한국공업화학회 2005 응용화학 Vol.9 No.1
We, in this study, fabricated and applicated MnO₂/carbon fiber nanocomposite web as electrode for supercapacitors prepared by co-electrospinning technique. At first, the PAN-Mn₃O₄ fiber web was prepared by an electrospinning technique to use the mixed solution of both polyacrylonitrile (PAN) in N,N-dimethylformamide (DMF) and 5 ~ 20 wt.% manganese oxide hydrate (Mn₃O₄). The electrospun PAN-Mn₃O₄ fiber web was stabilized at 280℃, and then carbon-Mn₃O₄ nanofiber web was carbonized at 1000℃ in the nitrogen atmosphere. The activated carbon/Mn0₂ electrospun fiber web was synthesized by activating at 800℃ in steam atmosphere. The structure of manganese oxide was changed that Mn₃0₄ was changed Mn0₂ during the carbonization and activation of nanocomposite web. The specific capacitance is increased with increasing Mn₃O₄ contents was 15 wt.%. But the specific capacitance is decreased at 20 wt.% Mn₃O₄/carbon nanofiber. The specific capacitances of 5 wt.% Mn₃O₄/carbon, 10 wt.% Mn₃O₄/carbon, 15 wt.% Mn₃O₄/carbon, 20 wt.% Mn₃O₄/carbon and activated carbon nanofiber or nanofiber composite electrode are 170, 230, 260, 175, 140 F/g, respectively at lmA/Cm². In the case of Mn₃O₄ addition, the specific capacitance is improved due to the synergic effect of pseudocapacitance. But the diameter of carbon fiber increased with the contents of Mn₃O₄ is increased. So the electro double layer capacitance is decreased.
Choi, Gyoung-Rin,Ju, Young-Wan,Jung, Hong-Ryun,Kim, Chan,Yang, Kap-Seung,Lee, Wan-Jin 한국공업화학회 2005 응용화학 Vol.9 No.1
The RuO₂/carbon fiber nanocomposite webs were prepared by a co-electrospinning technique in order to use as electrodes of supercapacitor. At first, the PAN-RuO2 fiber web was prepared by an electrospinning technique to use the mixed solution of both polyacrylonitrile (PAN) in N,N-dimethylformamide (DMF) and 10 to 20 wt.% ruthenium oxide hydrate (RuO₂). The electrospun PAN-RuO₂ fiber web was stabilized at 280C, and then carbon-RuO₂ nanofiber web was synthesized by activating at 800 C in the steam atmosphere. The specific capacitance is increased with increasing RuO2 contents. But the specific capacitance is decreased at 20 wt.% RuO₂/carbon fiber nanofiber. The specific capacitance of 10 wt.% RuO₂/carbon, 15 wt.% RuO₂/carbon, 20 wt.% RuO₂/carbon and activated carbon nanofiber or nanofiber composite electrode are 365, 461, 390, 140 Fig, respectively at lmA/Cm2. In the case of RuO₂ addition, the specific capacitance is improved due to the synergic effect of pseudocapacitance.