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韓國 齒科界에서 使用되고 있는 齒科用 鑄造金合金에 대한 調査 : A Study of Dental Casting Gold Alloys Used in Korea
禹亨植,全永男 大韓齒科器材學會 1967 대한치과재료학회지 Vol.2 No.2
A survey concerned with dental gold alloys used in Korea has made by questionnaires in order to ascerain whether Korean dentists are using the correct type of casting gold allays comparing with A.D.A. Specification #5. The questionnaires were as below. 1. Classification of the dental gold alloys. a. Use any commercial casting gold alloys? b. Otherwise, how do you get the casting gold alloys? 2. Constitutional formula of dental casting gold alloys? 3. Heat treatment method. The tesults were as follows. 1. Majority of answerers were making the dental casting gold alloys by themselves. 2. Less gold in constitution of the dental casting gold alloys were found from many answerers. 3. Excessive or less cupper in constitution were detected several clinics 4. Around 15 percent of silver contained alloys from the consititutional formula of dental gold alloys were adopted by many clinicians, however, none silver contained alloys were also found. 5. Excessive platinum was added for hard gold alloys. 6. Paladium, Zinc and Nickel was combined for dental casting glod alloys by few dentists. 7. Improper heat treatment methods were adopted by many dentists.
전영남,채종성 조선대학교 환경연구소 1995 環境公害硏究 Vol.12 No.-
Numerical simulation was performed for the 3-dimensional flow filed of gas and particle phase for cyclone dust collector. FVM(Finite Volume Method) was employed for gas phase. The flow was solved using the k-ε turbulence model. The particle exit at the bottom of the cone was treated as a solid wall in this model because the gas flow through the effective dust exit is usually insignificant. The major parameters considered in this study was vortex finder diameter, effective dust exit diameter, vortex finder length, inlet type for dimension performance. Particle trajectory calculations were made for three different particle sizes of 1, 25 and 50 ㎛. The results obtained from this study give some physical insight of dust particle collection mechanism together with the indication of the collection efficiency. The simulation results were in generally good agreement with empirical knowledge. The application of this kind of computer program looks promising as a potential tool for the design of cyclone and determination of optimum operating Condition.
Steam Plasma Reforming of Biogas by Non-Thermal Pulsed Discharge
전영남,김시욱,송형운 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.3
The purpose of this study was to develop technology that can convert biogas to synthesis gas (SynGas),a low emission substituted energy, using a non-thermal pulsed plasma method. To investigate the characteristics ofthe SynGas production from simulated biogas, the reforming characteristics were studied about the variations of pulsefrequency, biogas component ratio (C3H8/CO2), vapor flow ratio (H2O/TFR), biogas velocity and pulse power. Amaximum conversion rate of 49.1% was achieved for the biogas when the above parameters were 500 Hz, 1.5, 0.52,0.32 m/s and 657 W, respectively. Under the above-mentioned reference conditions, the dry basis concentrations ofthe SynGas were, H2 64.5%, CH4 8.1%, C2H2 6.7%, C3H6 4.9%, CO 0.8% and C2H4 0.4%. The ratio of hydrogen tothe other intermediates in the SynGas (H2/ITMs) was 3.1.