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임수진(Lim, Soo-Jin),박구곤(Park, Gu-Gon),박진수(Park, Jin-Soo),박석희(Park, Seok-Hee),윤영기(Yoon, Young-Gi),이원용(Lee, Won-Yong),임태원(Lim, Tae-Won),이영무(Lee, Young-Moo),김창수(Kim, Chang-Soo) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
고분자전해질연료전지 시스템이 영하 조건에 노출될 경우, 셀의 성능 및 내구성에 미치는 영향을 실험적으로 확인해 보았다. -30 ?C{sim}70 ?C 조건을 반복 경험시키며, 성능저하 정도를 살펴보았다. 일반적인 운전조건과 동결/해동에 의한 성능저하 요인을 분리하여 확인하기 위해, 30 ?C{sim}70 ?C 범위의 사이클을 진행한 경우에 대해, 위와 통일한 분석을 통하여 성능 및 각종 물성 값의 변화를 비교하였다. 동결조건에서 셀의 성능저하는 형성된 얼음의 물리적 부피팽창으로 인한 계면저항의 증가가 주요 원인임을 밝힐 수 있었다.
동결/해동 열사이클이 PEFC의 GDL/MEA에 미치는 영향
임남윤(Lim, Nam-Yun),박구곤(Park, Gu-Gon),박진수(Park, Jin-Soo),윤영기(Yoon, Young-Gi),이원용(Lee, Won-Yong),임태원(Lim, Tae-Won),김창수(Kim, Chang-Soo) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06
Proper water management is vital to achieve high performance and durability of PEFC (Polymer Electrolyte Fuel Cell). The effects of the residual water from PEFC after purge in shut-down processes on GDL/MEAs were investigated with freeze/thaw cycles Freeze/thaw cycle tests were conducted with single cells which were designed from transparent acryl plates. Single cells which contain several amount of residual water were cycles from 80?C to -28?C. The resistance changes of the single cells which have various amount of residual water were evaluated by ac-impedance analysis with 24 times of freeze/thaw cycles. Also, after the freeze/thaw cycles, the property changes were characterized by visual methods such as SEM, EPMA. Though it was difficult to observe noticeable property changes in the visual characterizations, the resistance of cells dramatically increased with the amount of remained water.
송승언 ( Seung Eon Song ),임태원 ( Tae Won Lim ),이광재 ( Kwang Jae Lee ),조아라 ( A Ra Jo ),채병도 ( Byung Do Chae ),고명주 ( Myung Ju Ko ),이채원 ( Chae Won Lee ) 영남대학교 의과대학 2015 Yeungnam University Journal of Medicine Vol.32 No.2
Rosai-Dorfman disease (RDD) is a benign proliferative histiocytic disorder of unknown etiology, which typically manifests as lymphadenopathy and systemic symptoms. Lymph node involvement is typical, but soft tissue RDD without nodal or systemic involvement is extremely rare. We report on a case of soft tissue RDD in a 16-year-old girl with a palpable mass on her buttock. It was firm, mobile, and discrete without tenderness. Excisional biopsy was performed, then RDD was confirmed histologically. RDD is a non-neoplastic disease that should be considered in the differential diagnosis of other soft tissue tumors. While the optimal treatment for extranodal RDD remains controversial, surgical excision is typically curative.