http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
M. Shimizu,Y. Ohsawa,H. Yoda,S. Shirotori,B. Altansargai,N. Shimomura,Y. Kato,S. Oikawa,H. Sugiyama,T. Inokuchi,K. Koi,M. Ishikawa,K. Ikegami,A. Kurobe Korean Magnetics Society 2018 Journal of Magnetics Vol.23 No.4
A voltage-control spintronics memory (VoCSM) which has a potential of low energy consumption uses the spin-Hall effect (SHE) and the voltage-controlled magnetic anisotropy (VCMA) effect for its write operation. In this work, the relationship between the critical switching current (Icsw) and the SHE electrode thickness (tN) is investigated in the range of 5 nm < tN < 8 nm. In the fabrication process, we develop highly-selective patterning process to stop MTJ etching precisely on the surface of the SHE electrode. Using the technique, Icsw is reduced by half as tN is varied from 8 nm to 5 nm, and Icsw of 112 mA at 20 ns write current pulse is obtained for MTJ size of 50 × 150 nm2 on Ta(2 nm)/TaB (3 nm) electrode. The results indicate that the decrease in the SHE electrode thickness is a promised method to reduce Icsw, which leads VoCSM to a low-energy-consumption device.
Good Scalability of Study of Spin Torque Transfer MRAMs with Perpendicular Magnetization MTJs
H. Yoda,T. Kishi,T. Nagase,M. Yoshikawa,E. Kitagawa,T. Daibou,K. Nishiyama,T. Kai,N. Shimomura,M. Nakayama,M. Amano,H. Aikawa,S. Takahashi,S. Ikegawa,M. Nagamine,J. Ozeki,S. Yuasa,Y. Nakatani,M. Oogan 한국자기학회 2008 한국자기학회 학술연구발표회 논문개요집 Vol.- No.-
H. Yoda,Y. Ohsawa,Y. Kato,N. Shimomura,M. Shimizu,K. Koi,S. Shirotori,T. Inokuchi,H. Sugiyama,S. Oikawa,B. Altansargai,M. Ishikawa,A. Kurobe 한국자기학회 2019 Journal of Magnetics Vol.24 No.1
We designed a voltage-control spintronics memory unit-cell, VoCSM, with high write-efficiency to prove a potential to reduce writing energy per bit. By optimizing a self-aligned structure, the cell has the critical switching current (Icsw) smaller than 50 μA at 20 nsec. for designed MTJ size of about 50 × 150 ㎚². The value is much smaller than that for mature STT-MRAM with the similar dimension. VoCSM also was proved to have unlimited endurance. Finally, with an empirical equation of Icsw further reduction of Icsw is estimated to clarify that VoCSM has a potential to reduce Icsw down to several μA.
Haruhiko Machida,Keiko Yoda,Yasuko Arai,Suguru Nishida,Ai Masukawa,Masayasu Asanuma,Toshiyuki Yuhara,Satoru Morita,Kazufumi Suzuki,Eiko Ueno,John M Sabol 대한영상의학회 2010 Korean Journal of Radiology Vol.11 No.3
Objective: To investigate the clinical feasibility of dual energy subtraction (DES) imaging to improve the delineation of the vocal cord and diagnostic accuracy of vocal cord paralysis as compared with the anterior-posterior view of flat panel detector (FPD) neck radiography. Materials and Methods: For 122 consecutive patients who underwent both a flexible laryngoscopy and conventional/DES FPD radiography, three blinded readers retrospectively graded the radiographs during phonation and inspiration on a scale of 1 (poor) to 5 (excellent) for the delineation of the vocal cord, and in consensus, reviewed the diagnostic accuracy of vocal cord paralysis employing the laryngoscopy as the reference. We compared vocal cord delineation scores and accuracy of vocal cord paralysis diagnosis by both conventional and DES techniques using κstatistics and assessing the area under the receiver operating characteristic curve (AUC). Results: Vocal cord delineation scores by DES (mean, 4.2 ± 0.4) were significantly higher than those by conventional imaging (mean, 3.3 ± 0.5) (p < 0.0001). Sensitivity for diagnosing vocal cord paralysis by the conventional technique was 25%, whereas the specificity was 94%. Sensitivity by DES was 75%, whereas the specificity was 96%. The diagnostic accuracy by DES was significantly superior (κ= 0.60, AUC = 0.909) to that by conventional technique (κ= 0.18, AUC = 0.852) (p = 0.038). Conclusion: Dual energy subtraction is a superior method compared to the conventional FPD radiography for delineating the vocal cord and accurately diagnosing vocal cord paralysis. Objective: To investigate the clinical feasibility of dual energy subtraction (DES) imaging to improve the delineation of the vocal cord and diagnostic accuracy of vocal cord paralysis as compared with the anterior-posterior view of flat panel detector (FPD) neck radiography. Materials and Methods: For 122 consecutive patients who underwent both a flexible laryngoscopy and conventional/DES FPD radiography, three blinded readers retrospectively graded the radiographs during phonation and inspiration on a scale of 1 (poor) to 5 (excellent) for the delineation of the vocal cord, and in consensus, reviewed the diagnostic accuracy of vocal cord paralysis employing the laryngoscopy as the reference. We compared vocal cord delineation scores and accuracy of vocal cord paralysis diagnosis by both conventional and DES techniques using κstatistics and assessing the area under the receiver operating characteristic curve (AUC). Results: Vocal cord delineation scores by DES (mean, 4.2 ± 0.4) were significantly higher than those by conventional imaging (mean, 3.3 ± 0.5) (p < 0.0001). Sensitivity for diagnosing vocal cord paralysis by the conventional technique was 25%, whereas the specificity was 94%. Sensitivity by DES was 75%, whereas the specificity was 96%. The diagnostic accuracy by DES was significantly superior (κ= 0.60, AUC = 0.909) to that by conventional technique (κ= 0.18, AUC = 0.852) (p = 0.038). Conclusion: Dual energy subtraction is a superior method compared to the conventional FPD radiography for delineating the vocal cord and accurately diagnosing vocal cord paralysis.
Effect of heat treatment on microstructure of BaTiO3 solidified by aerodynamic levitator
이치훈,이기주,김형균,임성환,M.S. Vijaya Kumar,Shinichi Yoda,조원승 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.2
BaTiO3 was solidified using an aerodynamic levitator. The effect of heat treatment on microstructure of BaTiO3 wasinvestigated. Domain walls with a width of ~ 400 nm were observed in the BaTiO3 grains. The composition shift fromstoichiometric BaTiO3 to a Ti- or TiO2-rich composition was attributed to the evaporation of BaO. Ti-rich Ba6Ti17O40 wasformed by a reaction with excess TiO2 and BaTiO3 during heat treatment at 1000 oC. A diffuse-interface was observed,indicating that Ba6Ti17O40 had formed by atomic diffusion.