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인클라인드 채널을 적용한 고분자 전해질막 연료전지의 성능 향상에 관한 연구
신동규(Dong Kyu Shin),강동균(Dong Gyun Kang),김민수(Min Soo Kim) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
In this study, novel flow channel which has a tapered depth from inlet to outlet is suggested to improve the performance of polymer electrolyte membrane fuel cell (PEMFC) by reducing concentration losses at high current density area. We designed three types of inclined channel which have the same inlet depth but different outlet depth. Then, the characteristics of performance of PEMFC were investigated with different types of channel shape. The performance of PEMFC was evaluated at temperature of 60 degree Celsius. As we compared polarization curves and power density curves, we could verify that PEMFCs with inclined channel showed better performance than that with conventional channel. Moreover, electrochemical impedance spectroscopy (EIS) was also used to figure out the factors that make fuel cell performance improved. Furthermore, a numerical analysis was conducted to investigate the effect of inclined channel on the performance of PEMFC from the perspective of oxygen depletion and flooding.
소득재분배정책이 양극화와 소득불평등 완화에 미치는 영향에 관한 국가간 비교연구
신동규 ( Dong Gyun Shin ),장지연 ( Ji Yeun Chang ) 한국사회보장학회 2010 사회보장연구 Vol.26 No.4
Based on the idea that bi-polarization of income is different from economic inequality measured by Gini coefficient, we examine the effects of taxation and public transfer on income bi-polarization. Our analysis based on the LIS(Luxembourg Income Study) data reveals that redistributive effects of policies vary to the type of welfare states. In the market-oriented English-speaking countries, redistribution policies do not work quite well for resolving bi-polarization, while those policies contribute to reduce bi-polarization as well as income inequality in the western and the northern Europe. We observe that public transfer has greater effects than taxation in the most of the OECD countries. Public transfer focusing on the poorest poor is not very effective, while universalism covering middle class people is an important feature for effective redistribution policies.