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오영상,이은우,정종혁,문승원,김수현,김동한,양혁승,박정환,박경옥,강성수,이영직 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.2
Tracheobronchopathia osteoplastica is a rare disorder of unknown cause characterized by the projection of numerous bony or cartilaginous submucosal nodules into the tracheobronchial lumen with sparing of the posterior membranous portion of tracheobronchial tree. In the past, most of the cases were diagnosed as secondary finding at autopsy. Nowaday, the key component of the evaluation is flexible fiberoptic laryngoscopy and bronchoscopy, which typically demonstrates irregular spicules of subrnucosal bone and cartilage projecting into the tracheobronchial lumen and causing various degrees of airway obstruction. A 45 years old man was visited Sunchon St. Carollo hospital due to discomfort on throat. We saw several nodules just below vocal cord via laryngoscope. The computed tomography revealed multiple small calcified nqdules on trachea and both main bronchi. Pathologic finding of bronchoscopic biopsy showed abnormal proliferation of bony and cartilagious nodules in the tracheal submucosa. These fingdings were consistent with tracheobronchopathia osteoplastica. We report here on a case of tracheobronchopathia osteoplastica with review of literature.
( Dong Hyeok Yang ),( Seong Ill Woo ),( Dae Hyeok Kim ),( Sang Don Park ),( Ji Hun Jang ),( Jun Kwan ),( Sung Hee Shin ) 대한내과학회 2013 The Korean Journal of Internal Medicine Vol.28 No.6
Coronary stent dislodgement is a rare complication of percutaneous coronary intervention. We report a rare case of dislodgement of two intracoronary stents. On withdrawal of two balloon catheters, one with a guide wire was mechanically distorted from the left main (LM) to the proximal left anterior descending artery (LAD) while the other was dislodged from the LM to the ostial left circumflex ar-tery. The stent in the LAD could not be retrieved into the guide catheter using a Goose neck snare, because it was caught on a previously deployed stent at the mid LAD. A new stent was quickly deployed from the LM to the proximal LAD, be-cause the patient developed cardiogenic shock. Both stents, including a distorted and elongated stent, were crushed to the LM wall. Stent deployment and crushing may be a good alternative technique to retrieving a dislodged stent.
모야모야병에서 두개절제술 시행 후 광배근 유리 피판술을 이용한 치료 1례
양성혁(Seong Hyeok Yang),한상철(Sang Chul Han),김정태(Jung Tae Kim),김연환(Youn Hwan Kim) 대한두개저학회 2011 대한두개저학회지 Vol.6 No.1
Moyamoya disease is a cerebrovascular disease of unknown etiology, which leads to a narrowing or occlusion of both internal carotid arteries in the presence of an abnormal hemangiomatosis vascular network at the base of the brain. The efficacy of encephalo-myosynangiosis (EMS) using muscle free flap was evaluated for the treatment of ischemic cerebrovascular disease in adult patients. A 36-year-old man presented right side motor weakness and mental change. The neurological examination and image work up revealed intracranial hemorrhage with moyamoya disease. In this case, latissimus dorsi muscular free flap were used for increased perfusion of the ischemic cortical region by indirect anastomosis. Cerebral blood flow study disclosed postoperative improvement of perfusion reserve capacity in all sides. EMS using muscle free flap is a possible procedure in selected patients with impaired cerebral perfusion reserve capacity due to multiple stenosis or occlusion of cerebral arteries including moyamoya disease.
Yang, Jin Hyeok,Hwang, Seong Ju,Chun, Seung Kyu,Kim, Ki Jae The Korean Electrochemical Society 2022 Journal of electrochemical science and technology Vol.13 No.2
In this paper, we report the effects of temperature on the deterioration of graphite-based negative electrodes during the longterm cycling of lithium-ion batteries (LIBs). After cycling 75 Ah pouch-type LIB full cells at temperatures of 45℃ (45-Cell) and 25℃ (25-Cell) until their end of life, we expected to observe changes in the negative electrode according to the temperature. The thickness of the negative electrode of the cell was greater after cycling; that of the electrode of 45-Cell (144 ㎛) was greater than that of the electrode of 25-Cell (109 ㎛). Cross-sectional scanning electron microscopy analysis confirmed that by-products caused this increase in the thickness of the negative electrode. The by-products that formed on the surface of the negative electrode during cycling increased the surface resistance and decreased the electrical conductivity. Voltage profiles showed that the negative electrode of 25-Cell exhibited an 84.7% retention of the initial capacity, whereas that of 45-Cell showed only a 70.3% retention. The results of this study are expected to be relevant to future analyses of the deterioration characteristics of the negative electrode and battery deterioration mechanisms, and are also expected to provide basic data for advanced battery design.
Kwon, Hyeok-Chan,Yang, Wooseok,Lee, Daehee,Ahn, Jihoon,Lee, Eunsong,Ma, Sunihl,Kim, Kyungmi,Yun, Seong-Cheol,Moon, Jooho American Chemical Society 2018 ACS NANO Vol.12 No.5
<P>Organometal halide perovskite materials have become an exciting research topic as manifested by intense development of thin film solar cells. Although high-performance solar-cell-based planar and mesoscopic configurations have been reported, one-dimensional (1-D) nanostructured perovskite solar cells are rarely investigated despite their expected promising optoelectrical properties, such as enhanced charge transport/extraction. Herein, we have analyzed the 1-D nanostructure effects of organometal halide perovskite (CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3-<I>x</I></SUB>Cl<SUB><I>x</I></SUB>) on recombination and charge carrier dynamics by utilizing a nanoporous anodized alumina oxide scaffold to fabricate a vertically aligned 1-D nanopillared array with controllable diameters. It was observed that the 1-D perovskite exhibits faster charge transport/extraction characteristics, lower defect density, and lower bulk resistance than the planar counterpart. As the aspect ratio increases in the 1-D structures, in addition, the charge transport/extraction rate is enhanced and the resistance further decreases. However, when the aspect ratio reaches 6.67 (diameter ∼30 nm), the recombination rate is aggravated due to high interface-to-volume ratio-induced defect generation. To obtain the full benefits of 1-D perovskite nanostructuring, our study provides a design rule to choose the appropriate aspect ratio of 1-D perovskite structures for improved photovoltaic and other optoelectrical applications.</P> [FIG OMISSION]</BR>
만성활동성 간염과 간경변증 환자에서 혈청 4형 교원질의 의의
이양일(Yang Il Lee),최성곤(Seong Kon Choi),금민수(Min Soo Keum),김영탁(Young Tak Kim),권혁만(Hyeok Man Kweon),김대현(Dae Hyun Kim),최영환(Young Hwan Choi),김성국(Sung Kook Kim),권영오(Young Oh Kweon),최용환(Yong Hwan Choi),정준모(Joo 대한소화기학회 1997 대한소화기학회지 Vol.29 No.1
N/A Background/Aims: Liver biosy is usually used to assess the expect of hepatic fibrosis, however, it is limited hecause serious complications have been reperted accasionally and frequent examinations are not adequate, Recently, the serum level of type IV collagen-7S domain is known to reflect the activity of collagen synthesis in the process of fibrosis. We evaluate the clinical usefulness of serum type IV collagen as an indicator of hepatic fibrosis. Methods: Serurn levels of type IV collagen 7S domain were evaluated in 88 subjects including 20 healthy persons, 40 patients with chronic active hepatitis confirmed by liver biopsy and 28 patients with liver cirrhosis. The patients with chronic active hepatitis were classified as mild(18 cases), moderate(11 cases) and severe degree(11 cases) according to the histologic findings and the patients with liver cirrhosis were classified as Child A(10 cases), B(10 cases), C(8 cases) according to modified Childs classification. Serum level of type IV collagen-7S domain was measured by radioimmunoassay (RJA). Results: Serum type IV collagen-7S domain concentrations in patients with chronic active hepatitis and liver cirrhosis were significantly higher than those in healthy persons(p<0.05). And significant correlations between the patients with chronic active hepatitis and with liver cirrhosis were also found(p<0.05). When chronic active hepatitis was divided into mild, moderate and severe degree there was a statistical significances(p<0.05). And significant correlations were found between the serum type IV collagen and the grade of the modified Childs classification(p<0.05). Conclusions: These results suggest that the measurement of serum type IV co]lagen may be a simple, noninvasive method and sensitive rnarker of hepatic fibrosis and also may reflect tbe status of progression in cirrhosis. (Korean J Gastroenterol 1997; 29:65 - 73)