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저위합류 담낭관을 가진 환자에서 잔여 담낭관석에 의해 발생한 Mirizzi syndrome의 내시경적 치료 1예
송치우 ( Chiwoo Song ),손병관 ( Byoung Kwan Son ),최재혁 ( Jea Hyuk Choi ),김동신 ( Dong Shin Kim ),김세종 ( Sae Jong Kim ),민향기 ( Hyang Ki Min ),김상혁 ( Sang Hyuk Kim ),이기영 ( Ki Young Lee ) 대한췌담도학회 2017 대한췌담도학회지 Vol.22 No.1
Mirizzi syndrome is a rare complication, resulting in bile duct obstruction and jaundice that usually arise from impacted gallstone in the cystic duct or neck of the gallbladder. It is vitally important to confirm underlying cystic duct anomaly in Mirizzi syndrome since it can produce surgical difficulty and higher complications. Generally, Mirizzi syndrome is treated surgically while endoscopic treatment is limited. Herein, we present Mirizzi syndrome with low lying cystic duct and remnant cyst duct calculi treated successfully by biliary stent and administration of choleretic agent, following by balloon dilatation on cystic duct and balloon extraction of the stone.
VRF 시스템의 고효율 부하대응 열교환기 가변유로 기술에 관한 연구
장지영(JiYoung Jang),송치우(ChiWoo Song),윤필현(PhilHyun Yoon),사용철(YongCheol Sa) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
In this study, the latest heat exchanger technology to improve the performance of the VRF system is introduced. The heat exchanger is a key component in VRF system performance and in order to respond effectively to various loads, a technology has been developed that divides the heat exchanger into three passages through valve control and realizes optimal load-response operation by changing the flow passage. This technology enables bypass operation to respond to a small load under heating overload conditions, and prevents freezing of the lower end of the heat exchanger to supply continuous heating operation. In addition, it was possible to increase the operating efficiency by about 20% by changing the heat exchanger flow path during cooling and heating operation.