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Magnetostatic Coupling Between two Nanowires of Different Width
Hanseok Lee,Seungho Kim,Youngwook Chang,Kyung-Hwa Yoo,J. Lee 한국자기학회 2009 Journal of Magnetics Vol.14 No.1
The magnetostatic interaction between the two magnetic nanowires was studied by using the longitudinal magneto-optical Kerr effect (MOKE). For this purpose two magnetic nanowires having different widths (400 ㎚, 800 ㎚) were fabricated on an Si substrate with electron beam lithography and the lift-off method. Magnetic hysteresis loops measured by MOKE showed double switching behavior, corresponding to the separated switching fields of each wire. The switching field of the narrow wire was greatly affected by the separation between the two wires. Based on how the switching field changes with decreasing separation, it is concluded that the magnetostatic field of the 800-㎚ wire strongly affects the switching of the 400-㎚ wire when the separation is less than 0.5 ㎛.
김도현(Dohyun Kim),노기한(Kihan Noh),손영욱(Youngwook Son),박기환(Kyihwan Park),유창희(Chang-hee Yoo) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
본 연구에서는 비접촉식 보조제동장치 개발을 위한 대상 시스템 및 차량 동역학 해석 모델을 개발하고, 시뮬레이션을 통해 제동 성능을 분석하였다. 동역학 해석 모델은 다물체동역학 해석 S/W인 ADAMS를 이용하여 개발하였으며, Simulink로 개발된 수학적 모델을 연동하여 ADAMS/Simulink co-simulation을 수행하였다. 제동시뮬레이션은 직진 주행시 제동과 오르막 및 내리막 주행시 제동 조건에서 수행하였으며, 내리막 및 오르막길은 경사각 10, 20, 30%의 조건을 적용하였다.
Lee, Hohyoung,Lee, Jeongbeom,Park, Gijung,Han, Yunseok,Lee, Youngwook,Cho, Gunhee,Kim, Hanam,Chang, Hongyoung,Min, Kyoungwook American Institute of Physics 2015 Review of scientific instruments Vol.86 No.8
<P>A high-speed impedance measurement system was developed, which enables the measurement of various characteristics of CW and pulsed plasmas with time resolution of less than a microsecond. For this system, a voltage and current sensor is implemented in a printed circuit board to sense the radio frequency signals. A digital board, which has a high-speed analog to digital converter and a field-programmable gate-array, is used to calculate the impedance of the signal. The final output of impedance is measured and stored with a maximum speed of 3 Msps. This sensor system was tested in a pulsed-plasma by applying it to the point between the matching box and the plasma chamber. The experimental equipment was constructed connecting the matching box, a 13.56 MHz generator, a 2 MHz generator that produced pulsed power, and a pulse-signal generator. From the temporal behavior of the measured impedance, we were able to determine the time intervals of transient states, especially of the initial active state. This information can be used to set the pulse frequency and duty for plasma processing.</P>
Preparation of large Cu3Sn single crystal by Czochralski method
Kong Minsik,Park Sang-Eon,Kim Hye Jung,Song Sehwan,Ryu Dong-Choon,Kang Baekjune,Sohn Changhee,Kim Hyun Jung,Kim Youngwook,Yoon Sangmoon,Go Ara,Jeen Hyoungjeen,Park Sungkyun,Jeong Se-Young,Kang Chang-J 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.7
Cu3Sn was recently predicted to host topological Dirac fermions, but related research is still in its infancy. The growth of large and high-quality Cu3Sn single crystals is, therefore, highly desired to investigate the possible topological properties. In this work, we report the single crystal growth of Cu3Sn by Czochralski (CZ) method. Crystal structure, chemical composition, and transport properties of Cu3Sn single crystals were analyzed to verify the crystal quality. Notably, compared to the mm-sized crystals from a molten Sn fux, the cm-sized crystals obtained by the CZ method are free from contamination from fux materials, paving the way for the follow-up works.