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한성엽(Han Sung-Yoeb),김강섭(Kim Kang-Seob),박민규(Park Min-Kyu),김시곤(Kim Si-Gon) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
The introduction of KTX (Korea Train eXpress) provided passengers with a much faster mode of transport, and KTX has become a model railway system. Express railway stations are emphasized as public transit transfer centers, but their service evaluations were not performed appropriately so far. It is possible to know the level of service by developing valuation criteria for their evaluations. The evaluation of transfer centers mainly consists of two parts; connective service with other travel modes, and transfer service inside transfer stations. Connection is defined as the inter-connection of multi-transportation vehicles, and transfer means that a passenger changes his travel mode to another. Such connective service and transfer service are evaluated by the level of service in terms of transfer facilities, the appropriateness of station layout and the quality of information throughout the facilities. We developed the service evaluation indicators of connective facilities and referred to the indicators of transfer facilities. We examined the 7 stations in Korea that are currently in operation and standardized the methodology of the evaluation process by applying the indicators suggested in this study.
금 나노입자를 회합시킨 수식된 흑연전극으로 NADH의 전기촉매 산화반응
차성극,한성엽,Cha, Seong-Keuck,Han, Sung-Yub 한국전기화학회 2007 한국전기화학회지 Vol.10 No.1
금 나노 입자를 회합시킨 흑연전극 표면에 mercaptopropionic acid(mpa)를 사용하여 자기조립 단층막(self-assembled monolayer: SAMs)을 생성시키고 이어서 도파민(dopa)과의 짝지움 반응을 통하여 Gr(Au)/mpa-dopa형의 수식된 전극을 제작하여 NADH의 전기촉매 산화반응에 적용하였다. 이 수식 전극이 전자전달반응속도와 반응과정에 대하여 연구하였다. 전극 표면에 고정된 도파민이 NADH와 이차반응 속도상수는 회전 전극법으로 0.1 M 인산염 완충용액(pH=7.0)에서 결정하였으며 그 값이 $5.06{\times}10^5M^{-1}s^{-1}$였고, $EC_{cat}$ 및 전자전달이 지배적인 과정이었다. 그러나 반응초기 즉, $10^{-3}s$ 이내에서는 이 전극에서 확산에 영향을 받으며 그 때 확산계수는 $4.64{\times}10^{-4}cm^2s^{-1}$이다. Mercaptopropionic acid(mpa) has been used to make self-assembled monolayer(SAMs) on the surface of graphite electrode incorporating gold nano particles, which are subsequently modified with dopamine(dopa). Such modified electrodes haying types of Gr(Au)/mpa-dopa were employed in the electrocatalytic oxidation of NADH. The responses of such modified electrodes were studied in terms of electron transfer kinetics and reaction procedure in the reaction. The reaction of the surface immobilized dopa with NADH was studied using the rotating disk electrode technique and a value of $5.06{\times}10^5M^{-1}s^{-1}$ was obtained for the second-order rate constant in 0.1 M phosphate buffer(pH=7.0), which was a $EC_{cat}$ and kinetic controlled procedure. But, the modified electrodes were diffusion controlled reaction having $4.64{\times}10^{-4}cm^2s^{-1}$ of the coefficient within $10^{-3}s$ after starting the reaction.