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Magnetization Behavior of Co Nanodot Array
Joonyeon Chang,B. A. Gribkov,HyungJun Kim,Hyuncheol Koo,Suk Hee Han,V. L. Mironov,A. A. Fraerman 한국자기학회 2007 Journal of Magnetics Vol.12 No.1
We performed magnetic force microscopy (MFM) observation on array of Co dots in order to understand magnetic state and magnetization behavior of submicron sized Co dots patterned on GaMnAs bridge. MFM observations showed the magnetization reversal and processes of local magnetization of individual ferromagnetic Co nanodots. Magnetic state of Co dots either single domain or vortex is dependent on geometrical size and thickness. Transition from single domain to vortex state can be realized with MFM tip assisted local field. Magnetization reversal process takes place through sequential reversal of individual dots. Localized inhomogeneous magnetic field can be manipulated by controlling magnetic state of individual Co dot in the array structure.
Magnetic Force Microscopy (MFM) Study of Remagnetization Effects in Patterned Ferromagnetic Nanodots
Joonyeon Chang,A. A. Fraerman,Suk Hee Han,Hi Jung Kim,S. A. Gusev,V. L. Mironov 한국자기학회 2005 Journal of Magnetics Vol.10 No.2
Periodic magnetic nanodot arrays were successfully produced on glass substrates by interference laser lithography and electron beam lithography methods. Magnetic force microscopy (MFM) observation was carried out on fabricated nanodot arrays. MFM tip induced magnetization effects were clearly observed in ferromagnetic elliptical nanodots varying in material and aspect ratio. Fe-Cr dots with a high aspect ratio show reversible switching of the single domain magnetization state. At the same time, Co nanomagnets with a low aspect ratio exhibit tip induced transitions between the single domain and the vortex state of magnetization. The simple nanolithography is potentially an efficient method for fabrication of patterned magnetic arrays.
Park, Ben Joonyeon,Jang, Taekjin,Choi, Jong Woo,Kim, Namkug Hindawi Publishing Corporation 2016 Computational and mathematical methods in medicine Vol.2016 No.-
<P>We developed a contactless interface that exploits hand gestures to effectively control medical images in the operating room. We developed an in-house program called GestureHook that exploits message hooking techniques to convert gestures into specific functions. For quantitative evaluation of this program, we used gestures to control images of a dynamic biliary CT study and compared the results with those of a mouse (8.54 ± 1.77 s to 5.29 ± 1.00 s; <I>p</I> < 0.001) and measured the recognition rates of specific gestures and the success rates of tasks based on clinical scenarios. For clinical applications, this program was set up in the operating room to browse images for plastic surgery. A surgeon browsed images from three different programs: CT images from a PACS program, volume-rendered images from a 3D PACS program, and surgical planning photographs from a basic image viewing program. All programs could be seamlessly controlled by gestures and motions. This approach can control all operating room programs without source code modification and provide surgeons with a new way to safely browse through images and easily switch applications during surgical procedures.</P>
알파인 스키 레이싱 회전종목에서 오픈기문과 헤어핀 기문의 구간별 회전전략
김주년 ( Kim Joonyeon ),윤석훈 ( Yoon Sukhoon ) 한국체육대학교 체육과학연구소 2021 스포츠사이언스 Vol.39 No.1
본 연구의 목적은 회전 경기의 급경사에 설정되어 있는 헤어핀 컴비네이션의 구간별 회전기술과 오픈 기문 회전기술의 운동학적 차이를 규명하는데 있다. 국내 알파인 스키 선수 14명이 본 연구에 참여하였고, 7개의 관성센서를 사용하여 바깥 다리의 발목·무릎·엉덩관절의 3차원 각도를 산출하였다. 오픈 기문, 헤어핀 이전 기문, 헤어핀 첫 번째 기문, 그리고 헤어핀 두 번째 기문에서 나타나는 스킹소요시간 및 관절각도의 최대값과 최소값을 비교분석 하였다. 스킹소요시간에서 유의한 차이를 나타냈고, 엉덩관절의 최소 굴곡, 최대 외전, 최대 내회전 각도 및 무릎관절의 최소 굴곡 각도에서 유의한 차이를 나타냈다. 연구결과에 따라 스킹소요시간의 차이에 의해 오픈기문, 헤어핀 이전 기문, 헤어핀 두 번째 기문, 헤어핀 첫 번째 기문 순으로 관절의 움직임이 간소화 되었다. The purpose of this study was to investigate the kinematic differences between the turning techniques of the hair-pin combination and of the open gate in the alpine ski slalom. Fourteen Korean alpine ski racers were participated in this study. The three-dimensional angles of the ankle, knee, and hip joints of the outer-leg were calculated using 7 inertial measurement units. The skiing duration and the maximum and minimum values of joint angles were analized in the open-gate, previous gate of hair-pin, 1st gate of hair-pin and 2nd gate of hair-pin. There was a significant difference in the skiing duration, and there were significant differences in the minimum flexion, the maximum abduction, the maximum internal rotation angle of the hip joint, and the minimum flexion angle of the knee joint. Based on the results of this study, the movement of the joints was simplified in the order of the open gate, previous gate of hair-pin, the second gates of hairpin, and the first gate of hair-pin.