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긴 유경성의 Gastritis Cystica Profunda 1 예
이중기,이덕현,권범찬,백효종,박진석,신경순 대한소화기내시경학회 1999 Clinical Endoscopy Vol.19 No.1
Gastritis cystica profunda (GCP) is a rare disease which is mainly observed at the site of gastroenterostomy. However, it may occur in the stomach without a previous history of surgery. Under histologic examination GCP shows hyperplastic and cystic dilatation of the pseudopyloric glands with submucosal invasion. GCP with sessile polypoid pro-trusion is most commonly found but, submucosal tumors, giant gastric mucosal folds and pedunculated forms are occasionally found. We present the case of GCP showing a large sized polyp (3 2.5 2.5 cm) with a long pendulous pedicle that had developed in the fundus of the stomach without previous surgical history. Endoscopic polypectomy was performed for confirmation.
김진범(Jin-Bum Kim),권기영(Ki-Yeoung Kweon),이학성(Hahk-Sung Lee) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
High-voltage auto-expansion circuit breakers utilize the ablation of polytetrafluoroethylene(PTFE) nozzle to produce adequate conditions for arc quenching at current zero. The high-current simulation provides information about the mixing process of the hot PTFE cloud with the SF? gas which is difficult to access for measurement. But it is also difficult to simulate flow phenomenon because the flow in interrupter with high current and SF?-PTFE mixture vapor, complex physical behavior including radiation. Using the PC based PHOENICS, a commercial computational fluid dynamics(CFD) package, the conservation equation for the gas and temperature, velocity and electric fields within breaker can be visualized and thermal interruption capability predicted. These numerical results will reduce the number of costly short-circuit test.
PTFE 용삭을 고려한 초고압 복합소호 차단기의 열챔버 압력 특성 평가
김진범(Jin-Bum Kim),권기영(Ki-Yeoung Kweon),이학성(Hahk-Sung Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Self-blast circuit breakers utilize the energy dissipated by the arc itself to create the required conditions for arc quenching during the current zero. During the arcing period, high pressure, temperature and radiation of the arc could burn in pure SF6 gas and PTFE nozzle. Ablated nozzle shape and SF6-PTFE mixture vapor affect the performance of an self-blast circuit breaker. But it is hard to simulate the behavior of hot gas, prediction because of complex physical behavior including radiation, calculation of electric field. Using computational fluid dynamics, the conservation equation for the gas and temperature, velocity and electric fields within breaker can be solved. Performance of ablated nozzle shape are compared with original model.
김진범(Jin-Bum Kim),여창호(Chang-Ho Yeo),서경보(Kyoung-Bo Seo),권기영(Ki-Yeoung Kweon),이학성(Hahk-Sung Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Self-blast circuit breakers utilize the energy dissipated by the arc itself to create the required conditions for arc quenching during the current zero. The high-current simulation provides information about the mixing process of the hot PTFE cloud with SF? gas which is difficult to access for measurement. But it is also hard to simulate flow phenomenon because the flow in interrupter with high current, SF?-PTFE mixture vapor and complex physical behavior including radiation, calculation of electric field. Using a commercial computational fluid dynamics(CFD) package, the conservation equation for the gas and temperature, velocity and electric fields within breaker can be solved. Results show good agreement between the predicted and measured pressure rise in the thermal chamber.