船員のワークロードに関する研究-I : 海難と生体リズムの関係

概要

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A workload is the concept for synthesizing a stress and a strain, which contains watch-keepers' performance connected with casualties caused by human errors. This report explains analyses on the relationship between casualties and stress in an aspect of biological characteristics. One of data for these analyses is the time-related frequencies of domestic vessels' casualties (n=1,005 vessels). The second data is the number of watch-keepers engaged in the job for every hour (n=4,725 days). The third data is an oral temperature, a critical flickering frequency (CFF), and subjective feelings for a fatigue and a sleepiness from the field research on board (n=59 days). Analyses based on maximizing entropy method make clear that powerspectrums have peaks of power in around a half day and about a leastsquares methods make clear approximate cyclicalfunctions that temperature at 0:30 p.m., CFF at 1:40 p.m., fatigue at 1:00 a.m., and sleepiness at 0:30 a.m. These analyses suggest that the increasing casualty in midnight and early morning is related to a circadian rhythm in biological function rather than traffic conditions. It is important to prevent casualties that we investigate a workload under influence of environmental stress, task demand, physiological and psychological response, and performance for task, and so on.
社団法人日本航海学会の論文
1995-09-25