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NO 환원반응을 위한 V₂O?/TiO₂계 촉매필터의 MnO₂ 조촉매 효과
신해중(Hae Joong Shin),최재호(Jae Ho Choi),송영환(Young Hwan Song),이주영(Ju Young Lee),장성철(Sung Cheol Jang),최주홍(Joo Hong Choi) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
Nitrogen oxides (NO, NO₂ and N₂O) have been controlled effectively by the SCR catalysts coated on monolith or honeycomb in commercial sites with ammonia as reductant at high temperature range 300~400℃. However, the catalytic filter has much merit on the point of controlling the particles and nitrogen oxides simultaneously. It will be more advanced-system if the catalytic working temperature is reduced to the normal filtration temperature of under 200℃. This study has focus on the development of the catalytic filter working at the low temperature. So the additive effect of the components such as Pt and Mn (which are known the catalytic component of V₂O5/TiO₂ was investigated. The V₂O?-WO₃ catalytic filter exhibited high activity and selectivity at 250~320℃ showing more than 95% NO conversion for the treatment of 600 ppm NO at face velocity 2 cm/s. The Pt-V₂O?-WO₃ catalytic filter shifted the optimum working temperature towards the lower temperature (170~200℃). And NO conversion was 100% and higher than that of V₂O?-WO₃ catalyst at 250~320℃. The MnOX-V₂O?-WO₃ catalytic filter showed the wide temperature range of 220~330℃ for more than 95% NO conversion. This is a remarkable advantage when considered the MnOX catalytic filter presents the maximum activity at 150~250℃ and V₂O?-WO₃ catalytic filter shows the maximum activity at 250~320℃.
이주영(Ju Young Lee),송영환(Young Hwan Song),신해중(Hae Jong Shin),최재호(Jae Ho Choi),장성철(Sung Cheol Jang),윤강로(Kang Ro Yun),이용희(Yong Hee Lee) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
This study is an inorganic foaming ceramic by sol-gel reaction in order to overcome weak point of insulator using in construction equipment. We shall be able to confirm as the existing product substitute is possible result of this study. The solution where the silicate, the ceramic powder and the additive are included which makes foaming ceramic slurry, then the insulator made by used CO₂ Sol-Gel reaction. There being will be able to manufacture the insulator where the economical efficiency is excellent confirmed at the start product which is completed. The recording gel time decreases when the silicate will increase. Uses the hydrogen peroxide and fe make foam, when additionally surface preparation the fluorine resin, the water tolerance increases and will be able to complement the weak point of the silicate which omits in the water. The case which will use the loess powder with the research method which sees specially was environment-friendly product and according to appearing, the physical properties of nonflammability.
악성 전이 소견을 보인 양측 난소에 발생한 Sertoli-Leydig Cell Tumor 1예
박건호,김현희,윤혜진,최재호,윤민선,백승삼,호정규,김경태 대한부인종양 콜포스코피학회 2003 Journal of Gynecologic Oncology Vol.14 No.1
Sertoli-Leydig cell tumor는 드문 성색간질성 종양으로 양측성의 소견은 1% 미만으로 드물고 low grade malignancy에 속한다. 재발은 드물다고 알려져 있는데, 2/3가 초기 치료 후 1년 이내에 발생되고 복강내부와 후복막 림프절이 재발의 호발부위이다. 조직학적 분화도가 나쁘고 retiform pattern과 tumor rupture인 경우 악성화의빈도가 높다고 알려져 있다. 치료는 젊은 여성의 경우 병기 I일 때에는 자궁과 임신기능을 보존하는 편측 난소난관절제술을 시행한다. 1기보다 높은 병기일 경우 전자궁적출술 및 양측난소난관절제술, 골반림프절 곽청술을 시행하고 항암화학요법을 시행하기도 한다. 저자 등은 악성전이를 한 양측성 Sertoli-Leydig cell tumor를 경험하였기에 간단한 문헌 고찰과 함께 보고하는 바이다. The Sertoli-Leydig cell tumor is a rare sex cord stromal tumor that has low grade malignancy and low bilateral occurrence rate. About two third of recurrence appears within 1 year after the initial treatment and most common recurrence sites are intraperitoneal cavity and retroperitoneal lymph nodes. The frequency of malignant transformation is high in the poor differentiated cell type, retiform pattern, and tumor rupture. In young women with stage I, unilateral salpingo-oophorectomy is performed to preserve uterus and reproductive function. In more advanced stages, hysterectomy, bilateral salpingo-oophorectomy, and pelvic lymph node dissection are performed and occasionally chemotherapy can be combined. We experienced a rare case of malignant metastasis in Sertoli-Leydig cell tumor, and presented with a brief review of literature.