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운전 정지 시 보관방법이 고분자 전해질 연료전지의 열화에 미치는 영향 I. 잔류 수소 제거 방법의 영향
임상진,조은애,이상엽,김형준,임태훈,이관영,Lim, Sang-Jin,Cho, Eun-Ae,Lee, Sang-Yeop,Kim, Hyoung-Juhn,Lim, Tae-Hoon,Lee, Kwan-Young 한국전기화학회 2006 한국전기화학회지 Vol.9 No.3
반복적인 작동/멈춤에 의해 고분자전해질 연료전지의 성능 감소가 촉진되며, 이는 연료전지 자동차의 상용화를 위해 반드시 해결되야 한다. 고분자전해질 연료전지 스택의 운전을 정지했을 때 연료극 유로에는 수소가, 공기극 유로에는 공기가 남아 있어 연료전지가 열림회로 전위 상태에 한동안 유지되며 이로 인해 촉매의 소결이 촉진되고 과산화수소 라디칼이 형성되어 전해질를 분해시키는 것으로 보고되고 있다. 본 연구에서는 반복적인 작동/멈춤이 따라 고분자전해질 연료전지의 성능 감소와 막-전극 접합체의 특성에 미치는 영향을 조사하고, 운전 정지 시 잔존 수소를 제거함으로써 연료전지 스택의 내구성을 향상시키는 방법을 제안하였다. Degradation of polymer electrolyte membrane fuel cell (PEMFC) that is facilitated by on/off cycles is one of the most important issues for commercialization of fuel cell vehicles. When a PEMFC stack is shut down, residual hydrogen and induce high voltage equivalent to open circuit voltage to the cathode side that might cause sintering of Pt catalyst and facilitate formation of hydrogen peroxide at the anode side that might decompose $Nafionc\'{A}$ membrane. In this study, degradation of PEMFC exposed to repetitive on/off cycles was investigated by measuring i-V characteristics, ac impedance, cyclic voltammograms, gas leak, cross-sectional SEM images, and TEM images. To prevent degradation of PEMFC caused by the residual gases, hydrogen was removed from anode gas channel by gas-purging and by using a dummy resistance, that were found to be a very effective method.
임상진(Lim, Sang-Jin) 서울대학교 철학사상연구소 2010 철학사상 Vol.35 No.-
칸트의 미출간 저작 『최후유고』에는 경험의 가능성의 근거에 대한 상반되는 두 입장이 나타나 있다. 자기정립이론에서 칸트는 비판기의 입장을 견지하면서 경험의 가능성의 근거가 공간과 시간, 범주 등 주관의 형식적 요소라고 밝히지만, 반대로 이른바 이행이론에서는 그 근거가 에테르라는 질료적 요소라고 주장하고 있다. 그리하여 경험의 가능성의 근거는 주관 쪽에만 있는 것이 아니라 객관 쪽에도 있는 것처럼 보이고, 그래서 하나가 아니라 둘인 것처럼 보인다. 이 논문의 목적은 칸트의 경험의 가능성 개념을 살펴봄으로써 이러한 대립을 해소하는 데에 있다. In Kant’s unpublished work Opus Postumum, there are two opposite views about the bases of the possibility of experience. According to his self-positing theory, the bases of the possibility of experience are space, time, and categories, i. e. the formal elements of a subject. But according to his theory of transition, the basis is the material element which is called ‘ether’. Therefore, it seems that there are two bases of the possibility of experience: objective elements as well as subjective elements. The aim of this paper consists in solving this dilemma by looking into the concept of ‘the possibility of experience’.
급진성 치주염 환자에서 전신적 항생제 복용을 동반한 외과적 치주 치료 후 치주조직의 재생: 증례보고
임상진 ( Sang Jin Lim ),윤우혁 ( Woo Hyuk Yun ),피성희 ( Sung Hee Pi ),유형근 ( Hyung Keun You ) 조선대학교 구강생물학연구소 2011 Oral Biology Research (Oral Biol Res) Vol.35 No.2
The purpose of this study is to evaluate the feasibility of periodontal tissue regeneration in patients suffering from aggressive periodontitis who took systemic antibiotics as an adjunctive to periodontal treatment. Two patients with aggressive periodontitis were selected. Examination of clinical value and radiograph were performed. First, they took scaling and root-planing with systemic antibiotics. Appropriate surgical treatments were followed with selective alveolar bone graft. Patients visited regularly for postoperative clinical and radiographic evaluations. After periodontal treatment with an adjunctive antibiotics, improved clinical index such as increased clinical attachment level, decreased mobility and bleeding on probing were found in comparison with initial examination. Recovery of bone loss was observed in radiographic examination. This study suggests that periodontal treatment with systemic antibiotics is effective on prevention of disease and regeneration of periodontal tissue in patients with aggressive periodontitis.
임상진(Lim, Sang-Jin),김형준(Kim, Hyoung-Juhn),조은애(Cho, Eun-Ae),이상엽(Lee, Sang-Yeop),임태훈(Lim, Tae-Hoon) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
For commercialization of polymer electrolytemembrane fuel cell (PEMFC), durability of membrane electrode assemblies (MEAs) has to be improved. Especially, long-term stability of MEA is one of the most important issues for frequent shut-down and start-up processes of PEMFC. The degradation of MEA could be attributed to chemical attack of hydrogen peroxide radicals that are formed at high cell voltages without any special treatment to remove residual hydrogen from anode gas channel after shut-down of the fuel cell. In this study, we investigated the long-term stability of MEA under different on/off operation conditions. Residential hydrogen gas was removed from the anode flow channel by purging air or nitrogen. Also, a dummy resistance was applied to the fuel cell to exhaust residential hydrogen at the anode. In these cases, MEA showed much more stable durability. Electrochemical characteristics of the fuel cell were measured byrepeating the on/off cycles with the hydrogen removal processes. Also, degradation of MEA components was examined by SEM, TEM and XRD analyses.