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결석을 동반한 담낭염 환자에게서 발견된 이중관 총담관 기형
민경선 ( Kyung Sun Min ),박진석 ( Jin Seok Park ),정은선 ( Eun Seon Jeong ),한지영 ( Jee Young Han ),이만종 ( Man Jong Lee ),김정수 ( Jeong Soo Kim ),정석 ( Seok Jeong ) 대한내과학회 2011 대한내과학회지 Vol.80 No.2
Anatomical variation in the bile duct system is relatively common. Nevertheless, a double common bile duct is an extremely rare asymptomatic variant. Recognition of this anomaly is important clinically, because it can lead to complications, including choledocholithiasis, cholangitis, pancreatitis, and upper gastrointestinal malignancies. A correct diagnosis of this rare anomaly is also important because complications can occur in surgery if the anomaly is not recognized preoperatively. Recently, we encountered a very rare case of a double common bile duct associated with gallstone cholecystitis. A 33-year-old female was admitted to our hospital complaining of epigastric pain after meals. She had single biliary drainage from double common bile ducts with communicating channels. We report the case and review the literature on double common bile ducts. (Korean J Med 2011;80:208-211)
김정수 ( Jung Soo Kim ),민경선 ( Kyung Sun Min ),최석진 ( Seok Jin Choi ),남해성 ( Hae Sung Nam ),조재화 ( Jae Hwa Cho ),정은선 ( Eun Seon Jeong ),주고운 ( Ko Woon Joo ) 대한내과학회 2010 대한내과학회지 Vol.79 No.6
Primary pulmonary lymphoma is a rare disease, and non-B cell lymphomas (T-cell and natural killer cell lymphomas) involving the lung parenchyma are uncommonly reported. The most common radiological feature of pulmonary parenchymal lymphoma is a single mass or nodule. A 49-year-old woman with dyspnea was referred with suspicion of severe pneumonia. A chest radiograph showed diffuse nodular infiltration in both lungs. Acute respiratory failure was severe and rapidly progressive, so she was managed with a mechanical ventilator under the impression of acute respiratory distress syndrome (ARDS). A bronchoalveolar lavage and lung biopsy by video-assisted thoracic surgery revealed NK-T cell lymphoma. We report a case of extranodal NK-T cell lymphoma presenting as ARDS. (Korean J Med 79:697-700, 2010)
셀룰로오스 나노섬유의 제조 및 응용: 고강도 나노종이와 고분자복합필름
이선영 ( Sun Young Lee ),전상진 ( Sang Jin Chun ),도금현 ( Geum Hyun Doh ),이수 ( Soo Lee ),김병훈 ( Byung Hoon Kim ),민경선 ( Kyung Seon Min ),김승찬 ( Seung Chan Kim ),허윤식 ( Yoon Seok Huh ) 한국목재공학회 2011 목재공학 Vol.39 No.3
Cellulose nanofibrils (CNF) with 50~100 nm diameter were manufactured from micro-size cellulose by an application of a high-pressure homogenizer at 1,400 bar. High strength nanopapers were prepared over a filter paper by a vacuum filtration from CNF suspension. After reinforcing and dispersing CNF suspension, hydroxypropyl cellulose (HPC) and polyvinyl alcohol (PVA)-based composites were tailored by solven- and film-casting methods, respectively. After 2, 4, 6 and 8 passes through high-pressure homogenizer, the tensile strength of the nanopapers were extremely high and increased linearly depending upon the pass number. Chemical modification of 1H, 1H, 2H, 2H-perfluorodecyl-triethoxysilane (PFDTES) on the nanopapers significantly increased the mechanical strength and water repellency. The reinforcement of 1, 3, and 5 wt% CNF to HPC and PVA resins also improved the mechanical properties of the both composites.
AISI 321 스테인리스강의 크리프-피로 상호작용에 미치는 TiC 및 Cr_23C_6 입계탄화물의 영향
閔敬善,南壽祐,李守燦 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.10
In order to investigate the effects of TiC and Cr_23C_6 carbides on the creep-fatigue behaviors, total strain range controlled creep-fatigue tests were conducted at 600℃ in the TiC and Cr_23C_6 aged AISI 321 stainless steels with various carbide densities at grain boundary. It is observed that creep-fatigue lives of small TiC and TiC aged alloys are longer than that of Cr_23C_6 aged alloy in the same test conditions. To verify differences of creep-fatigue life between TiC and Cr_23C_6 aged alloys, microstructural observations are conducted by scanning electron microscope(SEM) and transmission electron microscope(TEM). It is expected that cavitation resistance of TiC aged alloy is stronger than that of Cr_23C_6 aged alloy. From the microstructural observations, it is verified that formation and growth of grain boundary cavities in TiC carbides are more retarded than in Cr_23C_6 carbides. Therefore, it is suggested that the types of carbides are a more prominent factor than the density of carbides for grain boundary cavitation in austenitic stainless steels.
316L 스테인리스강의 크리프-피로 상호 작용시 보론 및 질소의 첨가량의 차이에 따른 크리프-피로 수명의 특성 연구
남수우,류우석,민경선 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.7
The effect of boron and nitrogen on the low cycle fatigue and creep-fatigue behavior of 316L stainless steel was investigated at 873K. Under low cycle continuous fatigue conditions, 316LN (i.e., nitrogen-alloyed steel) had longer fatigue lives than 316L+B (i.e., boron-alloyed steel). Because 316LN has higher ductility and lower strength at 873K than 316L+B due to the nitrogen addition, 316LN shows better fatigue resistance than 316L+B. When the creep deformation was introduced by imposing tensile hold time, 316L+B had longer creep-fatigue lives than 316LN. From the result of microstructure observation and the fact that the experimental life is in good agreement with the predicted life from the life prediction model which is based on the grain boundary cavitational damage under creep-fatigue condition, the major damaging mechanism is the cavitation for the two alloys. In addition, from observation of the fractured surface and the cavity nucleation factor (P'), which is regarded as a new material constant, 316L+B as a lower grain boundary carbide density than 316LN, which has been known to provide a beneficial site for cavity nucleation. Therefore, the reason for the longer creep-fatigue life of 316L+B than 316LN can be explained by the fact that as the addition of boron significantly retards carbide nucleation and growth near the grain boundary, 316L+B has a lower grain boundary carbide density, which results in a lower cavity nucleation.