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Mayte Sánchez van Kammen,Jacoba P. Greving,Satoshi Kuroda,Daina Kashiwazaki,Akio Morita,Yoshiaki Shiokawa,Toshikazu Kimura,Christophe Cognard,Anne C. Januel,Antti Lindgren,Timo Koivisto,Juha E. Jääske 대한뇌졸중학회 2019 Journal of stroke Vol.21 No.3
Background and purpose Prediction of intracranial aneurysm growth risk can assist physicians in planning of follow-up imaging of conservatively managed unruptured intracranial aneurysms. We therefore aimed to externally validate the ELAPSS (Earlier subarachnoid hemorrhage, aneurysm Location, Age, Population, aneurysm Size and Shape) score for prediction of the risk of unruptured intracranial aneurysm growth. Methods From 11 international cohorts of patients ≥18 years with ≥1 unruptured intracranial aneurysm and ≥6 months of radiological follow-up, we collected data on the predictors of the ELAPSS score, and calculated 3- and 5-year absolute growth risks according to the score. Model performance was assessed in terms of calibration (predicted versus observed risk) and discrimination (c-statistic). Results We included 1,072 patients with a total of 1,452 aneurysms. During 4,268 aneurysm-years of follow-up, 199 (14%) aneurysms enlarged. Calibration was comparable to that of the followdevelopment cohort with the overall observed risks within the range of the expected risks. The c-statistic was 0.69 (95% confidence interval [CI], 0.64 to 0.73) at 3 years, compared to 0.72 (95% CI, 0.68 to 0.76) in the development cohort. At 5 years, the c-statistic was 0.68 (95% CI, 0.64 to 0.72), compared to 0.72 (95% CI, 0.68 to 0.75) in the development cohort. Conclusions The ELAPSS score showed accurate calibration for 3- and 5-year risks of aneurysm growth and modest discrimination in our external validation cohort. This indicates that the score is externally valid and could assist patients and physicians in predicting growth of unruptured intracranial aneurysms and plan follow-up imaging accordingly.
Park, J.W.,Lee, S.S.,So, B.S.,Jung, Y.H.,Kawasegi, N.,Morita, N.,Lee, D.W. Elsevier 2007 Journal of materials processing technology Vol. No.
<P><B>Abstract</B></P><P>Nanoscale fabrication of silicon substrate based on the use of atomic force microscopy (AFM) followed by chemical etching was demonstrated. A specially designed cantilever with a diamond tip, allowing the formation of damaged layer on silicon substrate by a simple scratching process, has been applied instead of conventional silicon cantilever for scanning. A thin damaged layer forms in the substrate at the diamond tip–sample junction along scanning path of the tip, which was found to be a low crystallized amorphous silicon layer. Hence, these sequential processes, called tribo-nanolithography, TNL, can fabricate 2D or 3D microstructures in nanometer range. Diamond tip fabrication processes for TNL follow the micro-patterning, wet chemical etching and CVD based on MEMS processes. The developed TNL tools show outstanding machinability against single crystal silicon wafer. Hence, they are expected to have a possibility for industrial applications as a micro-to-nano-machining tool. In our previous work, is has been clearly known that the damaged layer withstands against aqueous potassium hydroxide solution, while it dissolves in diluted hydro fluoric solution. This study demonstrates the effect of various machining parameters on mask layer, followed by wet chemical etching in potassium hydroxide and hydro fluoric solution.</P>
Bending Strength of Textured Alumina Prepared by Slip Casting in a Strong Magnetic Field
Suzuki Tohru S.,Uchikoshi Tetsuo,Morita Koji,Hirage Keijiro,Sakka Yoshio 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The mechanical properties of ceramics materials can be tailored by designing their microstructures. We have reported that development of texture can be controlled by slip casting in a strong magnetic field followed by heating even for diamagnetic ceramics such as alumina. A strong magnetic field of 12T was applied to the suspension indcuding alumina powder to rotate each particle during slip casting. The sintering was conducted at the desired temperature in air without a magnetic field. C-axis of alumina was parallel to the magnetic field. Bending strength of textured alumina depended on the direction of oriented microstructure.
Y.Uchihori,Y.Kawamura,S.Morita,A.Kojina,J.M.Sun,Y.J.Kim,T.Izumi,M.Nakaoka 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
This paper presents a novel prototype of a new concepttonal electromagnetic induction fluid heating appliance with eddy current-based flow-through thin metallic heater assembly, which is composed of the voltage source-fed type phase-shifted PWM series-load resonant high-frequency inverter using IGBT modules and thek driver modules in addition to a temperature sensor, and an auto-tuning PID gain controller for precise and stable temperature regulation scheme.<br/> In particular, the efficient series capacitor-compensated load resonant high-frequency inverter system with a power factor correction and active sinewave line current shaping functions is introduced as this induction-heated fluid heating appliance in pipeline used for industrial, medical, chemical, consumer power processing apphca-tions.<br/> Its operating characteristics in steady-state are illustrated and evaluated in experiment and its computer simulation results. The promising cost effective applications of this induction-heated fluid-heating appliance are mentioned from a practical point of view.
X. L. Huang,E. H. Wang,C. F. Dong,S. Morita,T. Oishi,I. Murakami,M. Goto 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.8
The radial profiles of the FeXVII 3s-2p and 3d-2p transitions emitted in the wavelength range of 15− 17 °A have been observed in the Large Helical Device (LHD). The chord-integrated radial profilesare converted into radial emissivity profiles by means of Abel inversion. The emissivity ratiosamong FeXVII n = 3-2 transitions calculated from the radial emissivity profiles are comparedwith calculations based on a collisional-radiative (CR) model developed for Fe ions. The resultreasonably confirms the effect of electron temperature and density on the emissivity ratio. However,the emissivity of the 3C (2p53d 1P1 ! 2p6) transition is obviously lower than the prediction fromthe CR model. This discrepancy is consistent with measurements in the solar corona and otherlaboratory plasmas.