Nowadays, downfall accidents of baby and infant are increasing. It is entertained that enlargement of the accidents, since high-rise apartment increase. Using effective monitoring system is necessary to prevent the accidents. However, baby and infant are exposed in electric field using ordinary wireless monitoring system. In this paper, LF band RFID(Radio Frequency Identification)is used as a marker and a sensor for monitoring. RFID is a sort of radio beacon system. In the system, signal sending time length from the marker is limited under approx. 10 ms. Helical sensor antenna is also used in the proposed system to prevent the exposure. However, detected distance of the marker is reduced in the condition, since it is difficult that the electric field of helical antenna is not extended in its outside. In this paper, enough distance is kept to realize suitable specification of marker antenna for baby and infant. Using the proposed system, baby and infant are protected from the unexpected accident in home.

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A device that can detect both DC and AC components of the bioelectric signal is proposed. The device consists of modified DC servo circuit and can measure the sympathetic skin response(SSR)noninvasively with plate electrodes. We conducted experiments for 5 subjects by stimulating the subjects with sound or electric stimulation to induce the SSR, and recorded the SSRs with the device from the forearm, palm, crus and sole. The results showed that the device could detect stable signal of both DC and AC components of SSR. Though duration of the SSR estimated from AC component has been reported to be around 5s, the recordings of DC component of the SSR revealed that SSR has 10 times longer duration. In addition, we calculated latency differences between forearm and palm, and also between crus and sole in order to derive the nerve's conduction velocity. The estimated nerve's conduction velocity was 0.76m/s on the average and this result agreed with physiological data of the conduction velocity of autonomic ganglia's fiber, 0. 3-1. 0m/s.

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The application of a magnetic field was investigated in order to prolong the service life of Metal-on-Metal artificial hip joint, in which the bearing material was Co-Cr-Mo alloy. It has been clarified that the magnetic field had a chemical effect on wear process in ferromagnetism materials; the chemical effect seemed to be acceleration of oxidizing the bearing surfaces. Pin-on-Plate and Sphere-on-Plate wear machines was used with test specimens, in which a permanent magnet was inserted. Each specimen was alternative of an artificial head or a socket. It was confirmed that the magnetic field dramatically reduced the wear of the Co-Cr-Mo alloy that was paramagnetic material. The inserted position of the magnet, which could expect the magnetic field, was limited. It was necessary that the magnetic flux in the space from the magnet to the rubbed point was not turbulence to reduce the wear.

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The purpose of this study was to evaluate the relaxation effects of odor and music on the human body through the change of physiological parameter after stress loading. Subjects were 6(3 males and 3 females, mean age: 30. 0years)healthy adults. We measured EEG, HR, SBP, DBP, RR as a physiological parameter. Profile of Mood States(POMS)was used for examining the psychological condition and Krapelin test was used for loading stress for 15 minutes. Lavender was used in the experiment, and a drop(0. 05ml)of essential oil was applied to the inside of the wrists on both arms. The relaxation music which is used for reducing stress was presented to the subjects for 5 minutes. EEG results indicated that the power value of a wave was expanded by the stimulus of odor and relaxation music. HR and SBP was significantly changed by both odor and relaxation music(P<0. 05). RR was significantly changed upon application of both odor and relaxation music(P<0. 01). No significant change was found both in DBP upon application of both odor and relaxation music. These results suggested that odor and relaxation music were effective on the human body in relaxation against stress.

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