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Raman Scattering Study of Relaxor Ferroelectric Pb(Sc1/2Nb1/2)O3 Crystals
Kohei Suzuki,SeijiKojima,Muhtar Ahart,Yonghong Bing,Zuo-Guang Ye 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.8
The effects of B-site ordering and vacancies were studied in the relaxor ferroelectric Pb(Sc1/2Nb1/2)O3 (PSN) family by using Raman scattering spectroscopy. Differences with Raman spectra and the depolarization ratios were clearly observed among B-site disordered PSN (PSN-D),B-site ordered with lead/oxygen vacancies PSN (PSN-OV ), and 0.7Pb(Sc1/2Nb1/2)O3-0.3PbTiO3(PSN-30PT) single crystals. The temperature dependence of the depolarization ratio of PSN-30PT was also studied to clarify the ferroelectric phase transitions and the polarization fluctuations in the polar nanoregions.
Magnetostatic Spin Wave in a Very Thin CoFeB Film Grown on an Amorphous FeZr Buffer Layer
김동석,Kohei Nawaoka,Shinji Miwa,박승영,Yoichi Shiota,유천열,조재훈,이병찬,Yoshishige Suzuki,이긍원 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.5
The transmission of a magnetostatic spin wave in a very thin CoFeB film (2.3 nm) grown on an amorphous paramagnetic FeZr layer was demonstrated for the first time by using an antenna method with coplanar waveguides. The attenuation length, determined by using the difference in intensities due to a change in the distance between the antennas, was estimated to be 0.7 μm. We discuss why we are able to observe spin-wave propagation in such a thin magnetic layer, taking the low damping constant ( = 0.0027) of the CoFeB films grown on the amorphous FeZr layer and the estimated large group velocity in the CoFeB films into account.
Stem cell-based therapy for inflammatory bowel disease
Hiromichi Shimizu,Kohei Suzuki,Mamoru Watanabe,Ryuichi Okamoto 대한장연구학회 2019 Intestinal Research Vol.17 No.3
Inflammatory bowel disease (IBD) is an idiopathic, multi-etiological disease characterized by inflammation and mucosal destruction of the gastrointestinal tract. Despite the remarkable advance in immunomodulating therapies, there still remains a certain population of patients who are refractory to conventional as well as biologic therapies and fail to achieve mucosal healing. To improve the prognosis of those patients, at least 2 types of stem cells have been tested for their potential therapeutic use. Transplantation of hematopoietic stem cells or mesenchymal stem cells have been tested in several clinical studies, but their beneficial effect still remains controversial. In this review, we would like to overview the recent clinical challenges of stem cell-based therapies in IBD and also introduce our new therapeutic plan of intestinal stem cell transplantation for IBD, based on our ex vivo intestinal organoid culture technique.
Correlation between Charge Asphericity and Dzyaloshinskii-Moriya Interaction
Sanghoon Kim,Kohei Ueda,Gyungchoon Go,Peong-Hwa Jang,Kyung-Jin Lee,Abderrezak Belabbes,Aurelien Manchon,Motohiro Suzuki,Yoshinori Kotani,Tetsuya Nakamura,Kohji Nakamura,Tomohiro Koyama,Daichi Chiba,Ki 한국자기학회 2018 한국자기학회 학술연구발표회 논문개요집 Vol.2018 No.3
Yoshitaka Takahashi,Nobuyuki Shimizu,Kohei Suzuki 대한기계학회 2005 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.19 No.1S
Accurate seismic analyses of large deformable moving structures are still unsolved problems In the field of earthquake engineering In order to analyze these problems, the nonlinear finite element method formulated by the absolute nodal coordinate approach is noticed Because, this formulation has several advantages over the standard procedures on mass matrix, elastic forces and damping forces In the case of large displacement problems But, It has not been fully studied to build frame structure models by using beam elements In the absolute nodal coordinate formulation In this paper, we propose the connecting method of the beam elements formulated by the absolute nodal coordinate The coordinate transformation matrix of this element is Introduced into the frame structure This beam element has the characteristic that the mass matrix and bending stiffiness matrix are constant even If m the case of large displacement problems, and this characteristic is being kept after the transformation In order to verify the proposed method, we show the numerical simulation results of frame structures for a vibration problem and a large displacement problem<br/>