Field Factor in the Sea Traffic Related Human Factors
This study clarifies the field factor at sea both in the daytime and at night using the distance (unit in nm: nautical mile) of the first visual perception. The field factor is defined as the luminance ratio between the luminance difference threshold and the luminance difference of the target as compared with the background luminance.The field factor in the road traffic is adjusted to 4～6 based on the result of the experimental study by Roper & Howard in 1938. However there is no study regarding the field factor in the sea traffic.In this study, the field factor in the sea traffic is based on the results in the daytime from the casualty judgement reports by the Japanese Marine Accidents Inquiry Agency (MAIA), and also the results of at night by comparing with the reports mentioned and the experimental study on the measurement of the ships stem light.These studies are based on the investigation of the casualty reports about ships collision and of the visibility level while examining a psychological factor necessary for the proper lookout from the navigation bridge of the ship.Finally, the field factor in the sea traffic is 2～3 whether it is in the daytime or at night.
Field factor Visibility level luminance difference threshold Lookout Sea traffic
FURUSHO Masao KUM Serdar FUCHI Masaki
Kobe University, Faculty of Maritime Sciences, JAPAN Graduate School of Science and Technology, Kobe University, JAPAN
国际会议
26th Session of the CIE(国际照明委员会（CIE）第26届大会)
北京
英文
738-741
2007-07-04（万方平台首次上网日期，不代表论文的发表时间）