Mental fatigue is inevitable in the workplace. Since mental fatigue can lead to decreased efficiency and critical accidents, it is important to manage mental fatigue from the viewpoint of accident prevention. An experiment was performed to evaluate mental fatigue using the formant frequency analysis of human voices. The experimental task was to mentally add or subtract two one-digit numbers. After completing the tasks with four different levels of mental fatigue, subjects were asked to read Korean vowels and their voices were recorded. Five vowel sounds of “아”, “어”, “오”, “우”, and “이” from the voice recorded were then used to extract formant 1 frequency. Results of separate ANOVAs showed significant main effects of mental fatigue on formant 1 frequencies of all five vowels concerned. However, post-hoc comparisons revealed that formant 1 frequencies of “아” and “어” were most sensitive to mental fatigue level employed in this experiment. Formant 1 frequencies of “아” and “어” significantly decrease as the mental fatigue accumulates. The formant frequency extracted from human voice would be potentially applicable for detecting mental fatigue induced during industrial tasks.

해양운송분야에서 인적 오류의 비중 및 피해가 막대하지만, 선박운항자 관점에서의 안전성 평가를 위한 구체적인 수단이나 기술의 개발은 미흡하며, 해양사고의 예방을 위한 인간공학적 시험평가 기법 및 항해장비와의 인터페이스 설계를 위한 관련 연구가 미흡하다. 즉, 해상교통 안전성 평가를 위한 선박운항 시뮬레이터의 활용도와 신뢰성을 높이기 위한 정량적 지표의 개발이 시급히 요구되고 있다. 본 논문에서는 해상교통 안전성 평가를 위한 인간공학적 실험평가 기