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S. KAJIWARA 한국자동차공학회 2014 International journal of automotive technology Vol.15 No.1
The purpose of this study was to evaluate the mental workload of increasing driving speed, from 60 km/h to180 km/h, when operating a driving simulator. The evaluation, based on changes in facial temperature and electrodermalactivity, showed that the difference between nose and forehead temperature increased, that the skin potential level decreased,and that the skin conductance level increased. Monitoring facial temperature and electrodermal activity were both found to beeffective in evaluating the mental workload involved.
Kwon, E.P.,Sato, S.,Fujieda, S.,Shinoda, K.,Kajiwara, K.,Sato, M.,Suzuki, S. Elsevier Sequoia 2013 Materials science & engineering. properties, micro Vol.570 No.-
Microscopic residual stress evolution in different austenite (γ) grains during shape memory process in an Fe@?Mn@?Si@?Cr alloy was investigated using the white X-ray microbeam diffraction technique. The use of high-energy white X-ray microbeam with small beam size allowed us to measure the microscopic residual stress in coarse γ grains with specific orientation. After tensile deformation large compressive residual stress was evolved in γ grains due to the formation of stress-induced ε martensite, but upon recovery heating it almost disappeared as a result of reverse transformation of martensite. The magnitude of compressive residual stress was higher in grains with orientations close to <144> and <233> orientations than in a grain with near <001> orientation. Analysis of the microstructure of each grain using electron backscattering diffraction suggested that the difference in the magnitude of compressive residual stress could be attributed to different martensitic transformation characteristics in the grains.
Kwon, E.P.,Sato, S.,Fujieda, S.,Shinoda, K.,Kajiwara, K.,Sato, M.,Suzuki, S. Elsevier 2017 Materials science & engineering. properties, micro Vol.705 No.-
<P><B>Abstract</B></P> <P>In this study, <I>in situ</I> white X-ray microbeam diffraction experiments were conducted to investigate the microscopic deformation behavior of a Cu-Al-Mn superelastic alloy during tensile testing. Local deformation both at a grain scale and an intragranular scale was revealed by analyzing Laue spot streaking that occurred within a grain and in some grains with different orientations. The streaking measured within a grain under tensile load showed inhomogeneous behavior because of an inhomogeneous martensitic transformation. Moreover, the effect was dependent on grain orientation. In a grain with a high Schmid factor, a large dispersion in the 2θ diffraction angle of Laue spots was observed due to significant Laue spot streaking, which can be attributed to that grain's favored martensitic transformation.</P>