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Magnetic Properties and Magnetoimpedance Effect in Mumetal Thin Films
Wan-Shik Cho,Tae-Sick Yoon,Heebok Lee,Chong-Oh Kim 한국자기학회 2001 Journal of Magnetics Vol.6 No.1
The dependence of the magnetoimpedance effect (MI) on magnetic properties has been investigated in mumetal thin films prepared by rf magnetron sputtering. Coercivity of thin films prepared at 400 W was about 0.4 Oe, and the magnetic anisotropy field of films deposited under a uniaxial magnetic field decreased with increasing film thickness. The saturation magnetization of mumetal films increased with rising input power and thickness, and was smaller than that of permalloy films. Transverse incremental Permeability (TPR) of films of 1 ㎛ thick increased with increasing effective permeability. The magneto impedance ratio (MIR) was proportional to TPR in films 1 ㎛ thick but in spite of lower effective permeability at higher thicknesses, MIR increased due to skin effect. The height of the double peaks in the MIR curves decreased with decreasing anisotropy and thickness. The maximum MIR value for a 4 ㎛ thick 75 % at 36.5 ㎒.
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절식에 따른 참전복, Haliotis discus hannai의 생존과 소화관의 조직학적 변화
강승완(Seung Wan Kang),이제봉(Jae Bong Lee),신현출(Hyun Chool Shin),조현서(Hyeon Seo Cho),곽인실(Inn Sil Kwak),이정식(Jung Sick Lee) 전남대학교 수산과학연구소 2006 수산과학연구소논문집 Vol.14 No.1
참전복, Haliotis discus hannai의 절식 및 재급식에 따른 소화관의 변화를 조직학적 방법을 이용하여 연구하였다. 28일간의 절식 후 절식 및 재급식에 따른 생존율의 변화는 없었다. 절식실험 결과 소화관 각 부위에 점막상피층의 두께, 점액세포의 면적은 절식 후 14일 이후부터 감소하였다. 점액세포의 성상은 절식 14일부터 중성에서 산성으로 차츰 전환되었다. 28일간의 절식후 재급식한 실험에서는 소화관의 구조는 7일 후 회복상태를 보였다. Effects of starving and re-fed on the histological changes of digestive tract of the abalone, Haliotis discus hannai were determined by using histological methods. After 28 days starvation survival rates were no differences between starved and re-fed group. The epithelial thickness and mucous cell area of digestive tract decreased with increase of staving period after 14days. The characteristic of mucus changed from neutral to acid after 14 days starving. In the experiment of re-feeding after 28 days starving, structures of digestive tract were recovered after 7 days.
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거풍지보단(祛風至寶丹)이 Mongolian Gerbil의 가역성 전뇌허혈 모델에 미치는 영향
정완우,박인식,신길조,이원철,정승현,Jeong, Wan-Woo,Park, In-Sick,Shin, Gil-Cho,Lee, Won-Chul,Jeong, Sung-Hyun 대한한방내과학회 2001 大韓韓方內科學會誌 Vol.22 No.2
Objectives : The purpose of this investigation is to evaluate the effect of Geupoongjibo-dan Extracts on Reversible Forebrain Ischemia in Mongolian Gerbils. Methods : The change rate of water content in cerebral tissues, the numercal change of the CA1 pyramidal neuron in the hippocampus, the change of delayed neuronal death(necrosis apoptosis) through light microscopy, the reactivity change of glycoprotein in neuronal membrane and the ultrastructural change of pyramidal neuron through electron microscopy caused by dalayed neuronal death were investigated. Results : 1. The change rate of water content in the normal group showed 78.90% on the third day, and 79.12% on the seventh day after an attack of ischemia. The rate in the control group showed 82.25% and 85.13%, respectively. The rate in the sample group showed a significant decrease: 81.72% and 83.66%. 2. Light microscopy revealed that the cells, continuous and systematic forms in the pyramidal cells of hippocampus, changed into discontinuous and unsystematic forms in the normal group when compared with the control group. The cells were less damaged in the sample group. 3. The mean of the numerical change of the CA1 pyramidal neurons in the hippocampus was 104 in the normal group. The mean of the control group was decreased to 27. The mean of the sample group was 44. 4. TUNEL staining examination reveals that the whole part of the hippocampus of the normal group had negative reactivity. As far as CA1 pyramidal neurons in the hippocampus, the control group had positive reactivity. The sample group was more positive than the control group. 5. Electron microscopy reveals that the ischemic injury of the control group had both necrotic and apoptotic morphology. The sample group was less necrotic, and more apoptotic morphology than the control group. 6. Lectin histochemisrical examination reveals that the normal group had positive reactivity to PNA and SBA in interneuron, and weak positive reactivity to WGA Con A LCA in intercelluar space. The reactivity to PNA and WGA decreased in the control group. The reactivity to PNA and WGA tended to increase in the sample group. Conclusions : The data shows that the effect of Geupoongjibo-dan Extracts on Reversible Forebrain Ischemia in MG is a significant result.
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Kazuhiro Nishikawa,Satoshi Ogata,Toshihiro Shoyama,Wan-Sick Cho,Tae-Sick Yoon,Masakiyo Tsunoda,Migaku Takahashi 한국자기학회 2002 Journal of Magnetics Vol.7 No.3
Three fabrication techniques for forming thin barrier layer with uniform thickness and large barrier height in magnetic tunnel junction (MTJ) are discussed. First, the effect of immiscible element addition to Cu layer, a high conducting layer generally placed under the MTJ, is investigated in order to reduce the surface roughness of the bottom ferromagnetic layer, on which the barrier is formed. The Ag addition to the Cu layer successfully realizes the smooth surface of the ferromagnetic layer because of the suppression of the grain growth of Cu. Second, a new plasma source, characterized as low electron energy of 1 eV and high density of 10¹² ㎝-³, is introduced to the Al oxidation process in MTJ fabrication in order to reduce damages to the barrier layer by the ion-bombardment. The magnetotransport properties of the MTJs are investigated as a function of the annealing temperature. As a peculiar feature, the monotonous decrease of resistance area product (RA) is observed with increasing the annealing temperature. The decrease of the RA is due to the decrease of the effective barrier width. Third, the influence of the mixed inert gas species for plasma oxidization process of metallic Al layer on the tunnel magnetoresistance (TMR) was investigated. By the use of Kr-O₂ plasma for Al oxidation process, a 58.8% of MR ratio was obtained at room temperature after annealing the junction at 300℃, while the achieved TMR ratio of the MTJ fabricated with usual Ar-O₂ plasma remained 48.4%. A faster oxidization rate of the Al layer by using Kr-O₂ plasma is a possible cause to prevent the over oxidization of Al layer and to realize a large magnetoresistance.
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