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갈륨액체금속 이온원과 인듐액체금속 이온원의 빔 특성에 대한 연구
현정우(Jeong Woo Hyun),임연찬(Youn Chan Yim),정강원(Kang Won Jung),정원희(Won Hee Jung),박철우(Cheol Woo Park),이종항(Jong Hang Lee),강승언(Seung Oun Kang) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.5
본 연구에서는 인듐 액체금속이온원을 제작하여 빔 특성에 대해 연구를 하였으며, 기존에 연구를 하였던 갈륨 액체금속이온원의 빔특성과 비교 분석 하였다. 빔특성 분석을 위해 빔 안정도, 전류-전압 특성곡선, 에너지 퍼짐을 측정하였다. 액체금속이온원에 사용되는 액체금속 저장소 및 바늘전극(tip)은 500㎛의 직경을 갖는 텅스턴을 사용하였으며, 국내에서 제작된 제품을 사용하였다. 액체금속 저장소의 구조는 이전에 구상하여 연구가 이루어진 6개의 pre-etching된 텅스텐 와이어(wire)가 묶여진 형태를 사용하였다.
고압주조한 Al-10% Mg 합금의 주조조직 및 기계적 성질에 관한 연구
정우현,정종연,이종남 ( Woo Hyon Jeong,Jong Yeon Jeong,Jong Nam Lee ) 한국주조공학회 1983 한국주조공학회지 Vol.3 No.1
In order to study the cast structure and mechanical properties of Al-10% Mg alloy solidified under the various high hydraulic pressure, ranging from O㎏f/㎠ to 2000㎏f/㎠ , the relationship between the cooling rate and the cast structure was observed, and also the mechanical test and the measurement of the specific gravity were carried out. From this experiment, results were summerized as follows; 1. The cooling rate of the alloy increased with increase of the applied pressure. 2. The formation of the piping and the porosity in the castings was surpressed by applying the high hydraulic pressure. 3. The dendrite arm spacing decreased with increase of the applied pressure. 4. Mechanical properties and specific gravity increased with the increase of the applied pressure.
정우현(Woohyeon Jeong),김주연(Jooyeon Kim) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
With the spread of electric vehicles, the market share of electric vehicles among global automobile sales is gradually increasing and it has continued to grow with a market share of 10% in 22. However, with the supply of electric vehicles, there are still problems to be solved, such as mileage problems depending on battery capacity, inconvenience in charging time and place, high vehicle prices compared to internal combustion engines due to battery prices, and uncertainties in subsidies. In the case of 4WD vehicles, there is driving stability due to road conditions and driving force distribution. Compared to internal combustion engines, electric vehicles have advantages such as spatial advantage and high output due to the application of two motors. Despite these advantages, 4WD electric vehicles need to improve efficiency due to their lower electricity ratio than 2WD. Among them, efficiency improvement through DAS application has been verified through various researches. Existing DAS simulations mainly focused on the simulation of vehicle perspectives using 1D simulation. In this research, a control simulator was developed to verify the behavioral characteristics during DAS engagement, and a multi-body dynamics analysis model was developed for precise verification of parts unit.