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하악골 절제술 및 비골유리피판을 시행한 성장기 환자에서 임플란트를 이용한 고정성 보철 수복 증례
이학영,김지환,Lee, Hag-Young,Kim, Jee-Hwan 대한치과보철학회 2020 대한치과보철학회지 Vol.58 No.3
구강암 등의 병소로 인해 하악골의 절제를 시행한 환자는 구강악안면계의 재건을 통한 기능적, 심미적 회복이 중요하다. 하악골의 재건에 많이 사용되는 비골유리피판은 임플란트 식립을 동반한 보철적 수복에 있어 용이하다. 그러나 성장기 환자는 비골의 크기가 작고 잔여 성장이 남아있을 수 있어 임플란트를 이용한 치료 시 어려움이 존재한다. 본 증례는 골육종으로 하악골 절제술 및 비골유리피판을 이용해 하악골의 재건을 시행한 11세 여성 환자로, 임플란트 지지 고정성 보철물을 이용한 보철적 수복을 통해 기능적, 심미적 회복을 도모하였다. 임플란트의 식립 부위 및 개수, 보철물의 형태적 고려를 하였으며, 성장기인 13세에 임플란트 지지 고정성 보철 수복을 완료하였고, 추가로 1년간의 경과 관찰을 시행한 바 안정적인 결과를 얻었기에 보고하고자 한다. 그러나, 이후의 추가적인 검진을 통해 악안면계의 변화를 관찰하는 것이 필요하겠다. Functional and esthetic recovery through reconstruction of the oral and maxillofacial system is important for patients who underwent mandibulectomy due to lesions such as oral cancer. The fibula free flap, which is frequently used in the reconstruction of the mandible, is easy to prosthetic restoration with implant placement. However, patients with growing periods have difficulty in treatment with implants when the size of the fibula is small and residual growth remains. This case is an 11-year-old female patient who underwent mandibulectomy due to osteosarcoma and reconstruction of the mandible using a fibular free flap. Functional and esthetic recovery were obtained through prosthetic restoration using implant-supported fixed prostheses. Implantation site, number of implants, and type of prostheses were considered. Implant-supported fixed prostheses were delivered at 13 years old, and after an additional 1 year observation, stable results were obtained. However, observing changes in the maxillofacial system through further examinations is necessary.
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김미수(Mi Soo Kim),이학영(Hag Young Lee) 한국수소및신에너지학회 1997 한국수소 및 신에너지학회논문집 Vol.8 No.3
Aromatic primary amines were prepared by the catalytic hydrogenation of aromatic nitro compounds in a benzene solution over 50 ㎎ of 10 % palladium on charcoal at a room temperature under 45 psi. This paper describes a study on the catalytic hydrogenation of nitrobenzene-d_5, <sup>15</sup>N-labelled nitrobenzene, and 4`-nitrobenzo-15-crown-5, respectively. The infrared absorption spectra exhibited a characteristic N-H stretching vibrations at 3450 and 3350 ㎝<sup>-1</sup>. The results suggest that the non-readily available aromatic amines would be commercially produced by catalytic hydrogenation because of its good yield and little by-product formation.
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박종웅,권기홍,박상철,유호원,이학영 경산대학교(대구한의과대학) 1998 環境硏究 Vol.3 No.1
This study aims to investigate generation and physicochemical characteristics of Municipal Solid Wastes(MSW) generated from different sources in Kyungju. The source are apartments(low, high-rise), single family houses(centra1, outer), traditional market, office(city hall), factory, school, Park. The unit waste discharge rate of residential MSW excluding recyclable solid wastes was 0.47 kg/(capita . day). The maximum coefficients of variation for month and season were 1.23, 1.17, respectively. The bulk density of solid wastes was largely different for each sampling site, and the bulk densities of apartment district, single family house district and public area were 232㎏/m, 247kg/m, 170kg/m, respectively. The load factory of vehicle was 457kg/m. The percentage of combustible material to solid wastes was 86.5%. The physical compositions of solid wastes were food of 36.2%, Paper of 32.3%, plastic of 11.9%, glass of 6.5%, metal of 4.6%, textile of 3.0%, rubber of 1.8% and wood of 1.3%. The proximate analysis results of solid wastes showed moisture of 45.7%, volatile solids of 45.2%, and ash of 9.1%. In case of moisture content, the maximum value showed 66.7% in high-rise apartment district and the minimum value 14.0% in school district. Carbon, hydrogen, oxygen, nitrogen, sulfur and chlorine contents of combustible solid wastes were 48.4%, 7.0%, 25.9%, 1.3%, 0.2% and 0.4%, respectively. The low heating values of combustible solid wastes were 1,365 ~ 2,896kca1/kg (average 1,892kca1/kg) in residential area and 1,200∼3,878kca1/kg (average 2,178kca1/kg) in public area. Especially, the generation rate and the moisture content of residential MSW separating food wastes decreased 2.7 and 1.7 times and the low heating increased 2.1 times in apartment district.
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홍석인,박승두,이학영 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.3
본 연구에서는 고체 전해질셀의 금속산화물 촉매전극상에서 NEMCA(non-faradaic electrochemical modification of catalytic activity) 현상을 살펴보았다. YSZ에 코팅된 V₂O_5 촉매전극은 고체 전해질셀(CO, O₂, V₂O_5 /YSZ/Ag, O₂) 상에서 전극과 촉매의 두 가지 역할을 동시에 수행한다. 전류를 가하지 않을 때 V₂O_5촉매전극은 일반적인 CO 산화촉매로의 역할을 수행하였다. 그러나 전류를 가함으로써 개회로에 비해 V₂O_5의 촉매활성도를 크게 할 수 있었다. CO 분압이 3.2㎪일 때 가해지는 50㎂의 전류에 의해서 개회로와 비교하여 7.7×10^(-9) g-atoms/s의 반응속도의 증가가 일어났다. 그리고 이때 계산된 향상인자(A)는 28.9였다. 이와 같은 현상은 가해진 전류가 V₂O_5와 흡착제간의 결합력을 약화시킴으로 이해될 수 있었다. The phenomena of NEMCA(non-faradaic electrochemical modification of catalytic activity) has been studied on metal oxide catalyst electrode in a solid electrolyte cell. The V₂O_5 catalyst electrode doped on YSZ(yttria stabilized zirconia) served both as a catalyst and as an electrode of the solid electrolyte cell; CO, O₂, V₂O_5 /YSZ/Ag, O₂. The V₂O_5 catalyst electrode under open circuit condition played a role of the regular CO oxidation catalyst. Applying current to this system, the catalytic activity of V₂O_5 catalyst was much higher than under open circuit. When CO partial pressure was 3.2 ㎪ and current of 50 ㎂ was applied, the reaction rate was enhanced to 7.7×10^(-9) g-atoms/s and the enhancement factor (A) was 28.2. It seems that the decrease in the covalent bond strength between V₂O_5 and adsobates, resulted from the applyed current, enhanced the reaction rate.
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