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방전플라즈마 소결법으로 제조된 Ta-Cu의 미세조직 및 전기접점 특성
주원,김영도,심재진,최상훈,현승균,임경묵,박경태,Ju, Won,Kim, Young Do,Sim, Jae Jin,Choi, Sang-Hoon,Hyun, Soong Keun,Lim, Kyoung Mook,Park, Kyoung-Tae 한국분말야금학회 2017 한국분말재료학회지 (KPMI) Vol.24 No.5
Microstructure, electric, and thermal properties of the Ta-Cu composite is evaluated for the application in electric contact materials. This material has the potential to be used in a medium for a high current range of current conditions, replacing Ag-MO, W, and WC containing materials. The optimized SPS process conditions are a temperature of $900^{\circ}C$ for a 5 min holding time under a 30 MPa mechanical pressure. Comparative research is carried out for the calculated and actual values of the thermal and electric properties. The range of actual thermal and electric properties of the Ta-Cu composite are 50~300 W/mk and 10~90 %IACS, respectively, according to the compositional change of the 90 to 10 wt% Ta-Cu system. The results related to the electric contact properties, suggest that less than 50 wt% of Ta compositions are possible in applications of electric contact materials.
원예특작분야 품종육성 연구개발의 비용편익 및 파급효과 분석
주원 ( Won Ju ),박정관 ( Jeong Gwan Park ),이주량 ( Joo Ryang Lee ) 한국생산성학회 2013 生産性論集 Vol.27 No.3
horticulture, breeding R&D, cost-benefit and spillover
바이오 경제시대 대응 시나리오에 따른 산업연관효과 추정
주원 ( Won Ju ),정윤정 ( Yoon Jung Jung ),이주량 ( Joor Yang Lee ) 한국생산성학회 2012 生産性論集 Vol.26 No.2
Biotechnology offers technological solutions for the issues: the limited availability of fossil fuel in the future, the overdependence on oil-exporting countries, and the reduction of greenhouse gas(GHG) emissions. The application of biotechnology could result in an emerging "bioeconomy" where biotechnology contributes to a significant share of economic output. Adaption and implementation of biotechnologies will greatly affect and change the way people live. For the successful bioeconomy era, considerable uncertainties facing both public and private sectors in our economies will need to be throughly discussed. So, this study estimated and evaluated the impact of the bioeconomy by input-output table. It turns out that the production inducement coefficients is 1.8687p with bio-industry. Comparing to 1.8445p without bio-industry, 0.0242p is increased. Consequently, if bio-industry is not promoted, local productive capacity will be spilled with dependence on overseas bio-industry. It is induced growth potential of bio-industry deteriorated. To capture and to enhance the benefits of the bio-industry, positive support is required.
마이크로리액터를 이용한 전구체 유속에 따른 CdSe/ZnS 양자점의 광학특성
박지영,정다운,주원,서한욱,좌용호,김범성,Park, Ji Young,Jeong, Da-Woon,Ju, Won,Seo, Han Wook,Cho, Yong-Ho,Kim, Bum Sung 한국분말야금학회 2016 한국분말재료학회지 (KPMI) Vol.23 No.2
High-quality colloidal CdSe/ZnS (core/shell) is synthesized using a continuous microreactor. The particle size of the synthesized quantum dots (QDs) is a function of the precursor flow rate; as the precursor flow rate increases, the size of the QDs decreases and the band gap energy increases. The photoluminescence properties are found to depend strongly on the flow rate of the CdSe precursor owing to the change in the core size. In addition, a gradual shift in the maximum luminescent wave (${\lambda}_{max}$) to shorter wavelengths (blue shift) is found owing to the decrease in the QD size in accordance with the quantum confinement effect. The ZnS shell decreases the surface defect concentration of CdSe. It also lowers the thermal energy dissipation by increasing the concentration of recombination. Thus, a relatively high emission and quantum yield occur because of an increase in the optical energy emitted at equal concentration. In addition, the maximum quantum yield is derived for process conditions of 0.35 ml/min and is related to the optimum thickness of the shell material.
유한요소법을 이용한 다양한 피질골 두께에서 6종의 골내임플랜트에 대한 수치적 연구
이용찬(Yong Chan Lee),조병욱(Byoung Ouck Cho),박영주(Young Ju Park),이영규(Young Kyoo Lee),최재봉(Jae Bong Choi),주원(Won Joo),최귀원(Kui Won Choi) 대한구강악안면외과학회 1999 대한구강악안면외과학회지 Vol.25 No.1
Dental implant is increasingly used to rehabilitate the masticatory function of missing teeth. Several types of dental implant have been desiened to give an optimal stress distribution to the surrounding bone, In this study, six types of implant were investigated using finite element methods 1) how the variation of cortical bone thickness affects the stress distribution in bony regions depending upon implant types, and 2) which type gives the best characteristics in the sense of stress distribution and stability. The hybrid-type implant with tapered cylinder and screw gave the optimum properties in view of stability and response due to variation of cortical bone thickness.
비담지 촉매를 이용한 NaBH<sub>4</sub> 가수분해반응에서 부산물의 특성
이혜리 ( Hye-ri Lee ),박대한 ( Dae-han Park ),주원 ( Won Ju ),나일채 ( Il-chai Na ),박권필 ( Kwon-pil Park ) 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.1
Sodium borohydride, NaBH4, shows a number of advantages as hydrogen source for UAV PEMFC (Unmaned Aerial Vehicle Proton Exchange Membrane Fuel Cells). In order to use for UAV, the weight and volume of byproduct should be small after NaBH4 hydrolysis reaction. Therefore, the weight and volume of byproduct were studied after NaBH<sub>4</sub> hydrolysis reaction using unsupported catalyst. The effect of catalyst type, concentra-tion of NaBH<sub>4</sub>, concentration of NaOH and thickness of catalyst pack on the weight and volume of byproduct were studied. Most of byproduct was NaB(OH)<sub>4</sub> and superficial volume of byproduct increased due to foam evolved from byproduct. The weight and volume of byproduct were not affected by concentration of NaOH used stabilizer. The weight of byproduct decreased as con-centration of NaBH<sub>4</sub> solution increased, but maximum volume of byproduct obtained at 23 wt% of NaBH<sub>4</sub>. Suitable defoaming agent reduced the volume of byproduct.