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NdFe10.7TiB0.3Nx 및 NdFe10.7 TiMo0.3Nx의 자기특성
김윤배(Y.B. Kim),김희태(H.T. Kim),김창석(C.S. Kim),김택기(T.K. Kim) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.3
It has been found that B is very effective for the increase of magnetization and Curie temperature in NdFe₁₁TiNx-type compounds having ThMn₁₂-type structure. Experimental results have shown that magnetization and Curie temperature of NdFe_(10.7)TiB_(0.3)Nx are 148 A㎡/㎏ and 560℃, respectively, by about 20 A㎡/㎏ and 90℃ higher than those of NdFe_(10.7)Ti_(1.3)N)x. On the other hand, Mo is effective for the increase of anisotropy field, and it seems to strongly inhibit the formation of α-Fe phase during the nitrification treatement. The anisotropy field of NdFe_(10.7)TiMo_(0.3)Nx is about 7960 ㎄/m (l00 kOe) which is about 1590 ㎄/m (20 kOe) higher than that of NdFe_(10.7)Ti_(1.3)Nx.
고특성 Nd₁₂Fe80B6(Nb, M) (M=Ti / Cu / Ga)급속응고리본의 자기특성
김윤배(Y. B. Kim),김창석(C. S. Kim),김동환(D. H. Kim),이갑호(K. H. Lee),김택기(T. K. Kim) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.1
Magnetic properties and microstructures of Nd₁₂Fe_(80)B_6(Nb, M) (M=Ti/Cu/Ga) melt-spun ribbons prepared by single wheel technique have been studied. The results of microstructural study have shown that Ga is effective for the orientation of c-axis normal to the ribbon plane. The Ga-added melt-spun ribbon, Nd₁₂Fe_(80)B_6(Nb, Ga), quenched at Vs=17.9 ㎧ was mostly composed of fine grains of about 30 ㎚ in size with the textured free-side surface. The powder of this ribbon aligned in magnetic field showd a high remanence of 0.87 T which was about 5% higher than that of ribbon itself. It is believed that there is a possibility to fabricate a new type of HIREM melt-spun ribbon with highly textured free-side surface.
ThMn₁₂ 형 Sm - Fe - Ti 급냉응고리본의 미세구조 및 자기특성
김윤배(Y.B.Kim),유권상(K.S.Ryu),김동환(D.H.Kim),김창석(C.S.Kim) 한국자기학회 1991 韓國磁氣學會誌 Vol.1 No.1
It has been found that the as-quenched ribbons of Sm_xFe_(100-x-y)Ti_y(3.8 ≤ x ≤ 11.5, 3.8 ≤ y ≤ 19.2) are composed of metastable TboCu_7-type structure, α-(Fe, Ti), Fe₂Ti and an unknown phase accompanying strong diffraction line at d=2.l4 Å. The metastable TbCu_7-type phase, which was formed by rapid quenching, did not transform fully to the stable phases after annealing at 850℃ for 45 minutes except the one existed in SmFe₁₁Ti melt-spun ribbon. The SmFe₁₁Ti melt-spun ribbon, annealed at 850℃ for 45 minutes in vacuum, was found to be composed of ThMn₁₂, α-(Fe, Ti) and Fe₂Ti phases. The formation of α-(Fe, Ti) and Fe₂Ti phases in this melt-spun ribbon was due to the evaporation of Sm atoms during the high temperature annealing. The atomic ratios for the surface and the inside of SmFe₁₁Ti melt-spun ribbon annealed in vacuum were SmFe_(25.8)Ti_(2.6) and SmFe_(11.7)Ti_(1.0) respectively. It is thought to be that much of α-(Fe, Ti) and Fe₂Ti phases exist on the surface of ribbon.
로봇 팔의 뇌 신호로부터 유도된 3D 좌표 추적을 위한 Guidance Law 적용에 관한 연구
김윤재,박성우,김원식,염홍기,서한길,이용우,방문석,정천기,오병모,김준식,김유단,김성완,Kim, Y.J.,Park, S.W.,Kim, W.S.,Yeom, H.G.,Seo, H.G.,Lee, Y.W.,Bang, M.S.,Chung, C.K.,Oh, B.M.,Kim, J.S.,Kim, Y.,Kim, S. 대한의용생체공학회 2014 의공학회지 Vol.35 No.3
It is being tried to control robot arm using brain signal in the field of brain-machine interface (BMI). This study is focused on applying guidance laws for efficient robot arm control using 3D coordinates obtained from Magnetoencephalography (MEG) signal which represents movement of upper limb. The 3D coordinates obtained from brain signal is inappropriate to be used directly because of the spatial difference between human upper limb and robot arm's end-effector. The spatial difference makes the robot arm to be controlled from a third-person point of view with assist of visual feedback. To resolve this inconvenience, guidance laws which are frequently used for tactical ballistic missile are applied. It could be applied for the users to control robot arm from a first-person point of view which is expected to be more comfortable. The algorithm which enables robot arm to trace MEG signal is provided in this study. The algorithm is simulated and applied to 6-DOF robot arm for verification. The result was satisfactory and demonstrated a possibility in decreasing the training period and increasing the rate of success for certain tasks such as gripping object.