http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
증례 : 소화기 ; 결석을 동반한 담낭염 환자에게서 발견된 이중관 총담관 기형 1예
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
간담도계는 해부학적 기형과 변형이 비교적 흔한 편이나 총담관의 기형은 매우 드물다. 총담관의 기형은 수술 시 담관의 손상을 일으킬 수 있으며, 상부위장관의 종양을 비롯하여 담도결석 등 여러 가지 합병증을 일으킬 수 있어서 임상적으로 매우 중요하다. 저자들은 결석을 동반한 담낭염 환자에게서 이중관 총담관 기형 중 type Vb를 발견하여 이에 문헌고찰과 함께 보고한다. 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)
증례 : 호흡기 ; 급성호흡곤란증후군으로 나타난 NK-T 세포 림프종
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
양측성 폐침윤을 보인 49세 여자에서 항생제 복합투여에도 상태가 더욱 악화되고 급성호흡곤란증후군으로 진행하였다. 폐병변의 원인을 밝히기 위하여 기관지 폐포 세척 및 폐생검을 시행하였고, NK-T 세포 림프종을 진단하여 보고하는 바이다. 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
본 연구에서는 마이크로 입자의 셀룰로오스를 1.400 bar의 압력에서 고압 호모지나이저(high-pressure ho-mogenizer)를 이용하여 직경이 약 50~100 nm의 셀룰로오스 나노섬유를 제조하였다. 나노섬유 현탁액을 감압 여과하여 고강도 나노종이를 제조하였다. 용매 및 필름캐스팅법을 이용하여 나노섬유를 hydroxypropyl cellu-lose(HPC) 와 Polyvinyl alcohol (PVA) 수지에 보강 및 분산시켜 복합필름을 제조하였다. 고압 호모지나이저 통과 횟수를 2. 4. 6. 8까지 점점 증가시켰을 때. 나노종이의 인장강도가 매우 높았으며 통과횟수가 증가할수록 직선적으로 크게 향상되었다. IH, IH. 2H, 2H-perfluorodecyl-triethoxysilane (PFDTES)로 나노종이를 화학적 개질한 결과. 나노종이의 기계적 강도와 내수성이 크게 향상되었다. 셀룰로오스 나노섬유를 HPC와 PVA 수지에 중량대비 l. 3 및 5% 로 보강시켰을 때. HPC와 PVA 복합필름의 기계적 강도가 크게 향상되었다. 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.