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The TSC spectroscopy was applied to investigate an influence of structural change and interfacial state on the electrical noperties of epoxy composites cured with acid-anhydride. A addition of overaboundant hardener and inorganic filler separated a D peak near l0ECl into two peaks of P1(1OC) and P2('BO'c) and increased magnitude of TSC spectra between a and D peak, which would be closely related with the prccess of thermal oxidation and separation of hardener's phenyl group according to an introduction of interfacial deformation, an expansion of free volume and a reduction of structural paclung density. And the treatement of silane couphg agents on fder improved interfacial deformation to decrease the amplitude of TSC spectra

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As a result of investment in railway safety focusing on passenger safety, the train accident rate has been reduced by half domestically and we have reached a high level of safety compared to other countries and other transportation modes. However, accidents related to staff are still at a high ratio compared to other countries. There have been few studies on staff safety and no relevant systematic safety measures have been implemented. More than 90% of staff fatalities occurred from rolling stock in motion and electrification, which are representative railway accidents. In this study, causes of accidents, and current safety measures for staff are analyzed focusing on trains in motion. The results can be utilized for developing new safety measures

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