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Whang, Hyun-Seok,Choe, Sug-Bong JAPAN SOCIETY OF APPLIED PHYSICS 2018 Applied physics express Vol.11 No.4
<P>Here, we present an analytic formula for the domain-wall depinning current from artificial triangular notches driven by the spin-orbit torque combined with the Dzyaloshinskii-Moriya interaction. Interestingly, in contrast to the magnetic-field-driven depinning, the depinning current is governed solely by the notch slope angle, irrespective of the notch depth and wire width. An analytic formula is proposed to explain the present observation on the basis of the variational principle for minimum energy states. The validity of the formula is verified via micromagnetic simulation, confirming the detailed effects of the spin-orbit torque and Dzyaloshinskii-Moriya interaction strengths. (C) 2018 The Japan Society of Applied Physics</P>
황현석(Hyun-Seok Whang),김갑순(Gab-Soon Kim) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.2
In this study, we describe the mechanical design of the cylindrical workpiece inspection system which that can inspect the workpiece machined in the CNC lathe. The workpiece automatic measuring device is composed of a workpiece aligning mechanism, a workpiece diameter measuring mechanism, and a workpiece height measuring mechanism. If the workpiece machined on the CNC lathe is placed on the pedestal of the cylindrical workpiece inspection system, the workpiece aligning mechanism moves the workpiece to the diameter-measuring position and the height- measuring positions, and the diameter-measuring mechanism and the height- measuring mechanisms sequentially measure the diameter and the height of the workpiece. The cylindrical workpiece inspection system was designed and manufactured. The characteristic experiment was conducted to confirm the operation of the machine tool of the cylindrical workpiece inspection system. As a The result of the characteristic test shows that, the workpiece automatic measuring device operated safely.
Magnetic Domain-wall Tilting Mechanism during the Transition of Domain-wall Chiralilty
Jung-Hyun Park,Dae-Yun Kim,Yune-Seok Nam,Hyun-Seok Whang,Sug-Bong Choe 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
Spin structure inside domain wall (DW) has attracted great attention due to its potential application on data storage or logic memory. Among terms affecting chirality of DW, Dzyaloshinskii-Moriya interaction (DMI) has been investigated in magnetic thin layer with perpendicular magnetization anisotropy. Based on such platform, most of experimental schemes have measured the chirality change under application of external in-plane field. By changing in-plane field, the direction of magnetization inside DW is changed, resulting in modification of chirality, DW energy, DW dynamics, etc. But those schemes have an assumption that DW is straightly placed across wire and only one variable, direction of the magnetization inside DW, is changed. Here, we propose generalized equation of equilibrium chirality with not only the degree of freedom of DW chirality (Ψ), but also the DW tilting angle (θ). With coordinate system in fig. 1, we numerically calculated equilibrium angle of Ψ and θ, giving a result of DW tilting in the transition regime of DW chirality (fig. 2). This result is counterintuitive in a sense that DW would not be tilted in transition regime as its energy is maximum at Ψ=0. Tilting angle of DW is maximum when in-plane field is applied as much as effective DMI field. Interestingly, the transition regime is widened as both Ψ and θ contribute to reduction of DW energy when in-plane field is changed. Additionally, we analytically calculated the critical field at which the DW starts and ends tilting. This study provides more realistic understanding of chirality and tilting mechanism by considering both contribution to DW energy. 〈그림 본문참조〉
調胃升淸탕이 Alzheimer's disease 모델 白鼠의 학습과 기억에 미치는 影響
黃義完,박순권,李雄錫,김현택 慶熙大學校韓醫科大學韓醫學硏究所 1998 慶熙韓醫大論文集 Vol.21 No.1
The effects of Jowiseungchungtang on the enhancement of learning and memory of AD model rats were studied with Morris water maze and radial arm maze. Sample group was electrolytically lesioned on nbM, and then daily treated with the medicine for two months. Control group with nbM lesion, and sham group with the sham operation were treated the vehicle for same duration. The following results were observed. 1. As the learning trials of Morris water maze processed repeatedly, sham group achieved 200.21±35.28 seconds in 1st trial, 153.14±62.66 seconds in 2nd, 109.93±42.57 seconds in 3rd, 79.29±50.07 seconds in 4th, and 48.07±29.39 seconds in 5th. The control group achieved 224.85±26.94 in 1st trial, 191.77±67.97 seconds in 2nd, 178.46±65.06 seconds in 3rd, 137.46±76.32 seconds in 4th, and 108.92±90.12 seconds in 5th. The sample group achieved 202.00±33.53 seconds in 1st trial, 196.17±40.65 seconds in 2nd, 172.50±56.30 seconds in 3rd, 88.75±47.70 seconds in 4th, and 84.17±59.73 seconds in 5th. Therefore, these data shows that all three groups were improved in learning capacity as trials were repeated, but the sample group showed more prominent improvement in learning compared with the control group(p<0.05). 2. In memory retention test of Morris water maze that counts the staying time in the target area, sham group stayed for 15.36±5.39 seconds, the control group stayed for 5.54±5.64 seconds, and the sample group stayed for 10.08±5.45 seconds. The analysis of the memory retention data shows that the sample group marked more significant improvement statistically in memory retention compared with the control group(p<0.05). 3. In the learning of radial arm maze, the number and rate of animals that arrive the learning criteria amounted 9 out of 14, 64.29% in sham group, none out of 13.0% in the control group, and 3 out of 12, 25.00% in the sample group. So, the sample group shows better learning capacity significantly compared with the control group(p<0.05). With the experimental results above, Jowiseungchungtang can be supposed to have the improving effects on the learning and memory of AD rats induced by eletronical injury of nbM.
Develop the Successive Rearing Method of the Large Copper Butterfly, Lycaena dispar
Seong-hyun Kim,Namjung Kim,Hae-chul Park,Hwang-young Kim,Jeong-hwan Kim,Seok-jo Whang,Man-young Choi,Yeon-ho Je 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.05
In order to establish an indoor-rearing system for Copper butterflies; Large Copper butterfly, Lycaena dispar, the effect of temperature, photoperiod on larval development was investigated. As temperature increased, the developmental period was gradually reduced. The developmental periods of Large Copper larvae was 11.0 days and 28.5 days at 30℃ and 17.5℃, respectively. We investigated the sensitivity of stages to diapause induction. The experiment involved transfer of individuals from diapause averting (LD 16:8 h, 25℃) to diapause inducing condition (LD 8:16 h, 20℃) at various stages. Daipause was induced in 95.2% insect transferred at hatching larvae, in 15.6% of insects transferred at 2nd stadium molt, in 0% of insects transferred at after 3rd stadium molt. Percentage of diapause induction increased with the length of short days and low temperature. The main sensitive stage to photoperiodic and temperature induction of diapause determination was the early first larval instar. The diapause sensitivity began 14 days and ended 20 days after hatching larvae. The main stage sensitive to photoperiodic induction of diapause determination was the early first larval instar under low temperature and short day length. In relation to diapause termination, pupation was accelerated with cold treatment after diapausing 15 to 20 days and suitable chilling temperature was 8℃.