Yasuhiko Izumi

Distribution and Identification of Airborne Fungi in Railway Stations in Tokyo, Japan

Distribution and Identification of Airborne Fungi in Railway Stations in Tokyo, Japan: Tamami Kawasaki, et al. Environmental Biotechnology Laboratory, Railway Technical Research Institute

Experimental Study on the Effects of Air Flow from Cross-Flow Fans on Thermal Comfort in Railway Vehicles

This study examines the effects of the periodic wind variations generated by cross-flow fans to offset the sensation of warmth under realistic conditions of occupant density and temperature change in commuter trains in Japan. Subjective experiments were performed in a stationary commuter vehicle at a rolling stock depot. The results of the study showed that (1) the temperature at which the subjects felt a neutral thermal sensation on average was 24.6 °C in the fan-off condition and 27.5 °C in the fan-on condition, (2) the temperature at which 20% of the subjects felt discomfort due to warmth was 24.3 °C in the fan-off condition and 27.6 °C in the fan-on condition, (3) the relations between air temperature and subjective evaluations under an occupant density of 0.3 m2 per person were almost the same as those under an occupant density of 0.2 m2 per person and (4) the draft risk model substantially overestimated the discomfort due to coldness at temperatures over 22 °C.

QUESTIONNAIRE SURVEY TO MEASUREMENT EXPERIENCER ON MEASUREMENT POSITION FOR HUMAN MOVEMENT VIBRATION IN BUILDINGS

This research examined measuring positions by using questionnaire survey with presenting a hypothetical measurement example of vibration induced by human moving in a room. Results obtained by the survey were the followings. (1) For the measurement of magnitude of vibration, many respondents select the center of the room and the middle of floor surrounded by large or small beams unless the positions are identified. (2) For the measurement of the floor resistance against human movement vibration, many respondents select the center of the room, and the middle between the center and each corner of the room.