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The influence of mental load upon the physiological functions was studied by measuring the urinary output of adrenaline and noradrenaline and by recording the heart rate continuously by cardiotachograph on 10 healthy adolescents (average 24 years) and 6 normal middle-aged men (average 52 years) during a continued arithmetical calculation test (Kraepelin-Uchida's test) lasting for 1 hour.

Among the recent problems in the fisheries in Japan, the development of fish farms is getting to be important. The breakwater for fish farms is required to have the functions of exchanging sea water and the preservation of fishing ground, as well as the outer facilities of finning ground.. Various types of breakwater to meet the requirements can be considered,the floating breakwater being one of them. When we limit the studies in the wave damping effect of a mobile breakwater, we can summarise that an effective floating breakwater should have sufficient draught under water surface and should have a comparatively large displaced water volume. In other words, the natural oscillation period of the floating body must be large enough as compared with that of the incident wave. (R. L.Wiegel '64) (K. Horikawa et al. '64) for practical purposes the studies on the shape and type must follow. However, if a floating breakwater is provided with a mechanism for attenuating wave, the above-mentioned criterion for the effectiveness must be largely changed.

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Experiments were performed to determine the effectiveness of signal rates on physiological functions and detection performance during a visual vigilance task.Experiment I employed a rate of 183 signals/ hr ; experiment II employed a rate of 35/hr.