00420862

open access

Version of Record

ブリッジチーム員間の心的負荷評価を目指して

Towards the Evaluation of Mental Workload among Bridge Teammates

Japanese (日本語)

Review of the Faculty of Maritime Sciences, Kobe University

1

51-56

神戸大学海事科学部

2004-07

2006-07-25

本文ファイルは、国立情報学研究所CiNiiより提供されたものです。

On entering and leaving ports, a captain needs so many operations of a rudder and engine control, that he/she gives orders for bridge teammates in a short time. Moreover, a ship's course control is difficult at a low speed as it is easily affected by wind and current. On Entering/leaving port, navigation is hard work in navigational watch keeping, and cooperation among bridge teammates is most important for safe navigation. Also, its importance is common knowledge in the world. However, its evaluation depends on a seafarer's experiences, not a quantitative index. The purpose of this paper is to evaluate the mental workload of bridge teammates on entering/leaving ports with heart rate variability. The experiment is carried out at three ports with our training ship. The bridge teammates are a Captain, a Deck officer and a Quartermaster, and we measure their R-R interval at the same time. Here, R-R interval means a time from R peak to the next R of heartbeats. We calculate the SNS value (LF/HF) with frequency components of R-R intervals, LF is 0.04 to 0.15 Hz and HF is 0.15 to 0.40 Hz. LF is reflected by the sympathetic nervous system and parasympathetic nervous system and HF is reflected by the parasympathetic nervous system. The SNS value is able to evaluate an activity of the sympathetic nervous system and parasympathetic nervous system at the same time. This index is used to evaluate the mental workload in many research fields. As a result, we can confirm the transition of the bridge teammates' mental workload with the SNS value when the captain makes a decision to change course and the deck officer and the quartermaster receive his/her orders.

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