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A Case of Transient Central Diabetes Insipidus after Aorto-Coronary Bypass Operation
유청훈,Jang-Hee Cho,Hee-Yeon Jung,Jeong-Hoon Lim,Mi-Kyung Jin,Owen Kwon,Kyung-Deuk Hong,최지영,윤세희,김찬덕,김용림,Gun-Jik Kim,박선희 대한의학회 2012 Journal of Korean medical science Vol.27 No.9
Diabetes insipidus (DI) is characterized by excessive urination and thirst. This disease results from inadequate output of antidiuretic hormone (ADH) from the pituitary gland or the absence of the normal response to ADH in the kidney. We present a case of transient central DI in a patient who underwent a cardiopulmonary bypass (CPB) for coronary artery bypass grafting (CABG). A 44-yr-old male underwent a CABG operation. An hour after the operation, the patient developed polyuria and was diagnosed with central DI. The patient responded to desmopressin and completely recovered five days after surgery. It is probable that transient cerebral ischemia resulted in the dysfunction of osmotic receptors in the hypothalamus or hypothalamus-pituitary axis during CPB. It is also possible that cardiac standstill altered the left atrial non-osmotic receptor function and suppressed ADH release. Therefore, we suggest that central DI is a possible cause of polyuria after CPB.
선박 추진용 25kW급 고분자전해질 연료전지 시스템 개발
한인수,정지훈,고백균,최청훈,유성주,신현길 한국수소및신에너지학회 2014 한국수소 및 신에너지학회논문집 Vol.25 No.3
A 25kW-class polymer electrolyte membrane (PEM) fuel cell system has been developed for thepropulsion of a leisure boat. The fuel cell system was designed to satisfy various performance requirements, suchas resistance to shock, stability under rolling and pitching oscillations, and durability under salinity condition, forits marine applications. Then, the major components including a 30kW-class PEM fuel cell stack, a DC-DCconverter, a seawater cooling system, secondary battery packs, and balance of plants were developed for the fuelcell system. The PEM fuel cell stack employs a unique design structure called an anodic cascade-type stack designin which the anodic cells are divided into several blocks to maximize the fuel utilization without hydrogenrecirculation devices. The performance evaluation results showed that the stack generated a maximum power of31.0kW while maintaining a higher fuel utilization of 99.5% and an electrical efficiency of 56.1%. Combiningthe 30-kW stack with other components, the 25kW-class fuel cell system boat was fabricated for a leisure. Asa result of testing, the fuel cell system reached an electrical efficiency of 48.0% at the maximum power of 25.6kWwith stable operability. In the near future, two PEM fuel cell systems will be installed in a 20-m long leisureboat to supply electrical power up to 50kW for propelling the boat and for powering the auxiliary equipments.