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연료전지 축전지 하이브리드 동력원에서 축전지의 동특성 해석
이봉도(Bong-Do Lee),정두환(Doo-Hwan Jung),고영호(Young-Ho Ko) 한국정보기술학회 2004 한국정보기술학회논문지 Vol.2 No.1
This research was carried out to develop direct methanol fuel cell(DMFC)/battery hybrid power sources used in portable applications. For portable power system, DMFC was applied for main power source at average load and battery, for sub power at overload. Connection apparatus between DMFC and battery was set and investigated in the real system. Voltages and currents of load, battery and DMFC were measured according to fuel, air and load change. The relationship between load share characteristic and battery capacity was surveyed. Correspondence in abnormal operation was also studied. A 40W DMFC stack was manufactured for this experiment. The results of this study can be applied to design the interface module of the fuel cell/battery hybrid system and to determine the design requirement in the fuel cell stack for hybrid power sources.
대장 절제술 후 발생한 회장 정맥류 출혈을 캡슐 내시경으로 진단한 1예
박창준 ( Chang Joon Park ),이봉은 ( Bong Eun Lee ),전혜경 ( Hye Kyung Jeon ),김광하 ( Gwang Ha Kim ),송근암 ( Geun Am Song ),고상화 ( Sang Hwa Ko ),이소정 ( So Jeong Lee ),박도윤 ( Do Youn Park ) 대한소화기학회 2018 대한소화기학회지 Vol.71 No.6
We report a case of bleeding ileal varices associated with intra-abdominal adhesions after colectomy which was successfully diagnosed using capsule endoscopy. A 77-year-old woman visited the emergency department for several episodes of melena. She had a medical history of neoadjuvant chemo-radiation therapy and subsequent surgery for rectal cancer 6 years previously. Conventional diagnostic examinations including upper endoscopy, colonoscopy, and abdominal computed tomography could not detect any bleeding focus, however, following capsule endoscopy revealed venous dilatations with some fresh blood in the distal ileum, indicating bleeding ileal varices. The patient underwent exploratory laparotomy and the affected ileum was successfully resected. No further gastrointestinal bleeding occurred during the 6 months follow-up. Small intestinal varices are important differential for obscure gastrointestinal bleeding especially in patients with a history of abdominal surgery in the absence of liver cirrhosis, and capsule endoscopy can be a good option for diagnosing small intestinal varices. (Korean J Gastroenterol 2018;71:349-353)