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고압 가스 분무법을 이용한 Fe-Hf-B-Nb-P-C 연자성 분말 제조 및 특성 평가
정재원,양동열,김기봉,이준홍,김영자,임태수,양상선,이민하,김휘준,김용진,Jeong, Jae Won,Yang, Dong-Yeol,Kim, Ki Bong,Lee, Junhong,Kim, Young Ja,Lim, Tae-Soo,Yang, Sangsun,Lee, Min Ha,Kim, Hwi Jun,Kim, Yong-Jin 한국분말야금학회 2016 한국분말재료학회지 (KPMI) Vol.23 No.5
In this study, ultra-fine soft-magnetic micro-powders are prepared by high-pressure gas atomization of an Fe-based alloy, Fe-Hf-B-Nb-P-C. Spherical powders are successfully obtained by disintegration of the alloy melts under high-pressure He or $N_2$ gas. The mean particle diameter of the obtained powders is $25.7{\mu}m$ and $42.1{\mu}m$ for He and $N_2$ gas, respectively. Their crystallographic structure is confirmed to be amorphous throughout the interior when the particle diameter is less than $45{\mu}m$. The prepared powders show excellent soft magnetic properties with a saturation magnetization of 164.5 emu/g and a coercivity of 9.0 Oe. Finally, a toroidal core is fabricated for measuring the magnetic permeability, and a ${\mu}_r$ of up to 78.5 is obtained. It is strongly believed that soft magnetic powders prepared by gas atomization will be beneficial in the fabrication of high-performance devices, including inductors and motors.
농업회사법인과 영농조합법인 경영성과에 영향을 미치는 요인 분석
정재원,이인규,김성섭,Jeong, Jae Won,Lee, In Kyu,Kim, Seongsup 한국농촌계획학회 2018 농촌계획 Vol.24 No.3
This study analyze factors influencing business performance by types of agricultural corporation for improving performance. The number of agricultural corporations have been increasing but their profitability has been decreasing. In this situation, it is important to analyze factors influencing business performance for improving their profitability. We estimate a model including financial indexes and corporation's characters using ordinary least square. We use agricultural corporations survey data for 10years(2005~2014) of Statistics Korea. This study analyze bookkeeping recorded agricultural corporations for the same period. As a result, we find factors to influence Return on Assets(ROA). Additionally, we calculate optimized current ratio and debt ratio for ROA maximization. Operation period and the number of full-time workers also have a positive effect on ROA. Agricultural production, processing and distribution variables by business types have a positive effect on ROA, but some of their interaction terms have a negative effect on ROA. We expect that this result will help for improving corporation's business performance.
정재원,김수현,곽윤근,Jeong, Jae-Won,Kim, Soo-Hyun,Kwak, Yoon-Keun 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.12
This paper presents the Wire Parallel Mechanism for robot pose measurement which can be used to robot calibration. It is constructed with six parallel links using wire. The position and orientation of the end effector of a robot are calculated from the wire length that measured by the encoder. The unique solution is obtained from a Newton-Raphson method and geometric configuration of the mechanism, also the method to estimate a measuring space is presented. Through the simulations, it is verified that the proposed mechanism can measure a robot pose, and has a large measuring space. In conclusion, it can be used effectively in a robot pose measurement with little cost and effort.
정재원,김진성,Jeong, Jae-Won,Kim, Jin-Seong 한국방위산업진흥회 1997 國防과 技術 Vol.- No.226
이 글에서는 화포의 필요성과 성능향상 한계에 대하여 설명하고, 그 한계를 극복하기 위하여 전기포가 연구되고 있음을 소개하였다. 전기포의 현재 기술수준과 무기체계화를 고려할 때 전열화학포가 가장 유력한 기술임을 제시하였으며 전열화학포의 원리, 종류, 특징, 장단점, 세부 소요기술과 그 발전방향을 종합정리학, 선진국의 연구동향을 정리하여 제시하였다.
정재원,김진성,Jeong, Jae-Won,Kim, Jin-Seong 한국방위산업진흥회 1997 國防과 技術 Vol.- No.225
이 글에서는 화포의 필요성과 성능향상 한계에 대하여 설명하고, 그 한계를 극복하기 위하여 전기포가 연구되고 있음을 소개하였다. 전기포의 현재 기술수준과 무기체계화를 고려할 때 전열화학포가 가장 유력한 기술임을 제시하였으며 전열화학포의 원리, 종류, 특징, 장단점, 세부소요기술과 그 발전방향을 종합정리하고, 선진국의 연구동향을 정리하여 제시하였다.