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李南基 충주대학교 1970 한국교통대학교 논문집 Vol.3 No.-
These are much amounts if Ag dissolved in fixing solution use in developing the photograph. Ag is collected from the silver halide after using sensitizer, after developing photograph, tuned into the activated part black. It is fused by Na₂S₂O₃ in order to get rid of the rest silver halide. At present the most studios throughout the country abandon the fixing solution after using it. Through the experiments I am going to collect the abandoned Ag. I took an accurate measurement of the amount of the silver contains in the sensitized paper and of the maount of the silver left after completion of photograph. I realized that it is valuable to collect and use the certain amount of fixing solution. I put Na₂S solution in the collect fixing solution, seperated black precipitation of Ag₂S from Ag, and turned Ag into cyanide process. I could collect approximately one gram of silver out of one litre of abandoned fixing solution. If it is possible to collect over ten thousand litre every month, I think it stands comparison with administration.
악정형력 적용을 위한 골내 고정원으로서 미니플레이트 형상의 영향: 3차원 유한요소법적 연구
이남기,백승학,최동순,박영욱,김지혁,차봉근,Lee, Nam-Ki,Baek, Seung-Hak,Choi, Dong-Soon,Park, Young-Wook,Kim, Ji-Hyuck,Cha, Bong-Kuen 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.4
Purpose: This study was performed to evaluate the stress distribution in the bone and the displacement distribution of the miniscrew under orthopedic force with two different types of miniplate design as skeletal anchorage for orthopedic treatment. Materials and methods: Finite element models were made for 6-hole miniplate (0.8mm in thickness), which were designed in two different shapes-one is curvilinear shaped (C plate, Jeil Medical Co., Korea) and another, Y shaped (Y plate), fixed with 3 pieces of miniscrew 2mm-diameter and 6mm-long respectively. A traction force of 4 N was applied in $0^{\circ}$, $30^{\circ}$ and $60^{\circ}$ to imaginary axis connecting two unfixed distalmost holes of the miniplate. Results: The maximum von Mises stress in the bone was much greater in the cortical portion rather than in the cancellous portion. C plate showed greater maximum von Mises stress in the cortical bone than Y plate. The maximum displacement of the miniscrew was greater in C plate than Y plate. The more increased the angle of the applied orthopedic force, the greater maximum von Mises stress in the bone and maximum displacement of the miniscrew. It was observed that in C plate, the von Mises stress in the bone and displacement of the miniscrew were distributed around the distalmost screw-fixed area. Conclusions: The results suggest that Y plate should have the advantage over C plate and in the placement of the miniplate, its imaginary axis should be placed as parallel as possible to the direction of orthopedic force to obtain its primary stability.