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김도현,박무인,유찬희,김규종,문원,박선자,장희경 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.2
저자들은 65세 남자 환자의 위 중부체부 대만부 전벽에 발생한 점막하 종양에 대하여 3년간 추적관찰 중 크기증가소견으로 쐐기 절재술을 시행하였으며, 조직검사 및 면역 조직 화학 검사에서 위 신경초종으로 진단한 1예를 경험하였기에 보고하는 바이다. Gastric schwannoma is a very rare gastrointestinal benign tumor, which represents only 0.2% of all gastric tumors and 4% of all benign gastric tumors. We report a case of gastric schwannoma with enlargement of size through serial endoscopic examination. Endoscopic examination showed a hard mass of 4 x 3 cm in size with normal overlying gastric mucosa on the great curvature of the mid-body of stomach. The pathological finding revealed a picture of spindle cell tumor. Immunohistochemical stain was strongly positive for S-100 protein and non-reactive for CD34, C-kit and smooth muscle actin, thus leading to the diagnosis of gastric schwannoma.
Kyung-Seun Yoo,Jong-In Dong,Jung-Ho Hwang,Hwa-Young Lee,Kyoon-Duk Yoon,Min-Seop Eom 한국대기환경학회 2007 한국대기환경학회 학술대회논문집 Vol.- No.-
Pyrolysis characteristics of various municipal wastes such as biomass and sewage sludge have been investigated in a fluidized bed reactor (0.1m I.D.×1.0m height). This study was performed to determine the effect of operating parameters such as temperature and U<SUB>o</SUB>/U<SUB>mf</SUB> on the generation of pyrolytic products. The optimum temperature for collecting bio-oil which can use renewable energy and valuable chemicals was 400℃. And the optimum U<SUB>o</SUB>/U<SUB>mf</SUB> conditions were 3.0 and 4.0. In optimum conditions, the maximum yield of bio-oil were collected from Quercus Acutissima, Larix Leptolepis and sewage sludge were 55wt%, 58wt% and 56wt%, respectively. Identified chemical components of bio-oil derived from biomass such as Quercus Acutissima and Larix Leptolepis were carbohydrates, furans, phenols, guaiacol and syringols. Lignin content of biomass affected the generation of guaiacol and syringol in bio-oil.
Effects of Particle Size and Gas Velocity on Bulk Sulfation of Al₂O₃ Support in CuO/γ-Al₂O₃ Sorbent
Yoo, Kyung Seun,Kang, Soon Kook,Kim, Sang Done 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.6
The effects of particle size and gas velocity on sulfation of alumina support of CuO/ γ-A1₂0₃sorbent have been determined in a thermogravimetric analyzer (TGA). Sulfation rate of alumina support of CuO/ γ?-A1₂0₃ increases with increasing gas velocity up to 0.2 m/s and then decreases with a further increase in gas velocity. The bulk sulfation rate of alumina support decreases with decreasing particle size and sample weight. The slight increase of gas velocity enhances the sulfation rate via reduction of gas film resistance but the outward diffusion rate of SO3 also increases. As a result maximum rate of bulk sulfation appears at about 0.2 m/s. The concentration of SO3 in pores of CuO/γ?-A1₂0₃ pellet and bulk sulfation rate of alumina support decrease with decreasing particle size.