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Effects of Polyphenol on Visual Fatigue Caused by VDT Work

Yoshihara A., Yamanaka K., Kawakami M.

International Journal of Occupational Safety and Ergonomics

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2009

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Vol. 15, No. 3

339--343

EN

Visual fatigue of VDT (visual display terminal) operators poses a serious problem for corporations where VDT work is a major part of operations. In this study, an investigation in a corporation was carried out to examine the effect of polyphenol on recovery from visual fatigue of the visual function caused by working at a VDT. Three kinds of parameters were used for evaluating the effect of polyphenol. As a subjective evaluation, the first was a questionnaire to ascertain subjective feelings of fatigue. As aspects of a physiological evaluation, the second and third parameters were the accommodative function and the flicker value.

2

Convenient Evaluation of Mental Stress With Pupil Diameter

Yamanaka K., Kawakami M.

International Journal of Occupational Safety and Ergonomics

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2009

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Vol. 15, No. 4

447--450

EN

This study proposes a convenient method of evaluating mental stress. The potential of monitoring changes in pupil diameter as a measure of human reliability while operating human–machine systems was examined experimentally. An experiment was carried out to clarify the relation between changes in pupil diameter and autonomic nervous activity by measuring an electrocardiogram and pupil diameter when 10 subjects completed a time-sensitive task. The electrocardiogram was measured using a multitelemeter system and pupil diameter was measured using an eye-mark recorder. Several relationships between changes in pupil diameter and autonomic nervous activity were revealed and indicated that measurement of pupil diameter was an effective indicator of autonomic nervous activity. Therefore, it may be possible to develop a monitoring system that measures changes in pupil diameter as an indicator of the mental state of workers operating human–machine systems.

3

Fluorescence Studies on Benzene and Benzene Aqueous Solution in Mesoporous Silica

Okada T., Yamanaka K., Goto Y., Inagaki S.

Polish Journal of Chemistry

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2008

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Vol. 82, nr 4

729-739

EN

We have measured fluorescence spectra as well as fluorescence decay curves of highly ordered mesoporous silica, SBA-15 and FSM-16 including benzene or benzene aqueous solution as a function of temperature. An efficient energy transfer from benzene excited singlet state to a defect in the wall of mesoporous silica emitted at about 300 nm was found. On the basis of the decay analysis, it was suggested strongly that many of the benzene molecules exist in the proximity to the surface of porewallowing to the strong molecular interactions between benzene and silica wall. It is noted that the defects in the silica wall seem to play an important role in understanding of the luminescence characteristics of chromophores embedded in mesopores.