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이규준(Kyujoon Lee),정치훈(Chihoon Jung),안동찬(Dongchan Ahn) 한국추진공학회 2016 한국추진공학회지 Vol.21 No.1
본 논문은 볼트 체결 강성이 추력 시험대에 미치는 영향을 연구한 것이다. 추력 시험대는 추진기관의 추력 성능을 평가하는 장비로 추력, 피치력, 요력(3 분력) 작용선에 대응하는 3 분력 계측선간의 평행도와 3 분력 계측선의 상호 직각도가 다분력 추력시험대의 성능을 좌우한다. 따라서 시험대의 초기형상을 작동 상태에서 유지시키는 것이 추력 시험대의 핵심 기능이다. 본 논문에서는 추력 시험대의 볼트 체결과 로드셀 트레인의 나사 체결의 공차 정확도가 추력 시험대에 미치는 현상을 규명하고 이를 극복하는 방안을 제시하였다. This paper is studied on the effect of the bolt joint stiffness on the Thrust Measurement Stand(TMS). TMS is a test stand for thrust performance of the propulsion system, which depends on two factors: The 1<SUP>st</SUP> is the parallel degree between directions of the thrust vector and action lines of the corresponding measuring load cells for the vector, and the 2<SUP>nd</SUP> is the orthogonality between action lines of the measuring load cells. Therefore, it is essential to maintain the original shape of the TMS under operating conditions. In this paper, it is examined how the geometric tolerance of the bolt joints and threads of the load cell trains affect the performance of the TMS. Also, some techniques to overcome related problems are proposed.
이규준(Kyujoon Lee),정치훈(Chihoon Jung),안동찬(Dongchan Ahn) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.11
본 논문은 볼트 체결 강성이 추력 시험대에 미치는 영향을 연구한 것이다. 추력 시험대는 추진기관의 추력 성능을 평가하는 장비로 추력, 피치력, 요력(3 분력) 작용선에 대응하는 3 분력 계측선간의 평행도와 3 분력 계측선의 상호 직각도가 다분력 추력시험대의 성능을 좌우한다. 따라서 시험대의 초기형상을 작동 상태에서 유지시키는 것이 추력 시험대의 핵심 기능이다. 본 논문에서는 추력 시험대의 볼트 체결과 로드셀 트레인의 나사 체결의 공차 정확도가 추력 시험대에 미치는 현상을 규명하고 이를 극복하는 방안을 제시하였다. This paper is studied on the effect of the bolt joint stiffness on the Thrust Measurement Stand(TMS). TMS is a test stand for thrust performance of the propulsion system, which depends on two factors: The 1<SUP>st</SUP> is the parallel degree between directions of the thrust vector and action lines of the corresponding measuring load cells for the vector, and the 2<SUP>nd</SUP> is the orthogonality between action lines of the measuring load cells. Therefore, it is essential to maintain the original shape of the TMS under operating conditions. In this paper, it is examined how the geometric tolerance of the bolt joints and threads of the load cell trains affect the performance of the TMS. Also, some techniques to overcome related problems are provided.
Oscillatory Interlayer Exchange Coupling in Amorphous CoSiB/Pt/CoSiB Structure
Choi, Youngha,Lee, Kyujoon,Kim, Youngkwang,Kang, Seung Ku,Kim, Taewan,You, Chun-Yeol,Jung, Myung-Hwa IEEE 2015 IEEE transactions on magnetics Vol.51 No.11
<P>Oscillatory interlayer exchange coupling (IEC) is found in amorphous CoSiB(1.5 nm)/Pt( <TEX>$t_{\rm {Pt}})$</TEX>/CoSiB(1.5 nm) structure as a function of the Pt layer thickness, <TEX>$t_{\rm {Pt}}$</TEX>, which is varied from 1.4 to 3.0 nm. We prepared the samples using dc magnetron sputtering method, and measured anomalous Hall resistance and magnetization hysteresis loops. All the samples show out-of-plane easy axes with perpendicular magnetic anisotropy energies. Surprisingly, strong antiferromagnetic IEC is found when <TEX>$t_{\rm {Pt}}=2.2-2.7$</TEX> nm, otherwise they are simple ferromagnets like multilayer systems of Co/Pt and Fe/Pt. The Pt layer is known as near ferromagnet, because it is easily polarized with an adjacent ferromagnetic layer or by a small amount of ferromagnetic impurities. The interlayer coupling via Pt has always been observed to be ferromagnetic so far. We report the antiferromagnetic IEC in amorphous CoSiB/Pt/CoSiB trilayer structure and propose its possible physical origin based on quantum well theory and negative spin polarization of Pt layer.</P>
Observation of strong bulk spin-orbit torques in the van der Waals ferromagnet Fe₃GeTe₂
Franziska Martin,Kyujoon Lee,Maurice Schmitt,Anna Liedtke,Aga Shahee,Haakon Thømt Simensen,Tanja Scholz,Tom G. Saunderson,Dongwook Go,Martin Gradhand,Yuriy Mokrousov,Thibaud Denneulin,Andras Kovacs,Be 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
The recent emergence of magnetic van der Waals materials allows for the investigation of current induced magnetization manipulation in two dimensional materials. Uniquely, Fe<sub>3</sub>GeTe<sub>2</sub> has a crystalline structure that allows for the presence of bulk spin-orbit torques (SOTs), that we quantify in a Fe<sub>3</sub>GeTe<sub>2</sub> flake. From the symmetry of the measured torques, we identify the current induced effective fields using harmonic analysis and find dominant bulk SOTs, which arise from the symmetry in the crystal structure. Our results show that Fe<sub>3</sub>GeTe<sub>2</sub> uniquely can exhibit bulk SOTs in addition to the conventional interfacial SOTs enabling magnetization modification even in thick single layers without the need for complex multilayer engineering.
Chang, Jaewan,Lee, Kyujoon,Jung, Myung Hwa,Kwon, Ji-Hwan,Kim, Miyoung,Kim, Sang-Koog American Chemical Society 2011 Chemistry of materials Vol.23 No.11
<P>Ordered double perovskite Sr<SUB>2</SUB>FeRuO<SUB>6</SUB> thin films were artificially fabricated by alternating growths of SrRuO<SUB>3</SUB> and SrFeO<SUB>3</SUB> unit atomic layers on atomically flat Ti<SUP>4+</SUP>-terminated SrTiO<SUB>3</SUB> (111) substrates, thereby realizing ferromagnetism (or ferrimagnetism) of 390 K magnetic transition temperature (<I>T</I><SUB>C</SUB>), which is nonexistent in disordered double perovskite Sr<SUB>2</SUB>FeRuO<SUB>6</SUB>, known as spin glass.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2011/cmatex.2011.23.issue-11/cm200454z/production/images/medium/cm-2011-00454z_0002.gif'></P>