In this study an indoor positioning system available in factories or shipyards was developed using the Bluetooth technology. By evaluating the influence of metals, human bodies and human postures quantitatively and carrying out suitable compensation, position detection was able to be performed in the accuracy of ±2m.

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In order to clarify the effect of high-speed turning for micro-parts, we have performed the experiments on turning of carbon steel (drill rod), free machining brass, pure aluminum and copper, using the micro-shaft of maximum rotating speed 20×10^4rpm. On the turning of drill rod surface roughness Ra in feed direction decreased from 300 to 50nm with increasing cutting speed 50 to 250m/min. On the other kinds of materials, Ra improved remarkably with increasing cutting speed. The validity of high-speed-turning at micro-parts production becomes clear from the experiments.

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An automatic electric power generator that utilizes self-excited rotation has been investigated as a power supply for information devices. By the approximate analysis with the dynamic model and the numerical simulation, the conditions that the self-exited rotation takes place are clarified. In order to create self-excited rotation, a system that increases the angular speed is suggested. When increasing the rotational speed, the motor is used as an actuator rather than a generator. The experimental results show that generating output increases from 10μW to 380μW by the system. The input voltage and time was optimized to reduce energy loss. A system that increases the rotational speed till self-excited rotation occurs in order to lessen the influence of the initial mass position and angular speed is proposed.

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In the sports monitoring system which measures a heart rate and displays the heart rate value on a watch, we have developed the new system in which the heart rate monitor unit and other system units can separately communicate with a wrist watch by using a short range radio communication. The system enables to use plural units including PC data communication simultaneously without any mutual interference.

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The tool is expected to monitor the living body information without feeling strange in daily life. Although the pulse rate is the important information of the living body, it was difficult to measure pulse rate correctly during motion, because the pulse rate have much influenced of the body motion. We developed pulse rate measurement technology to reduce influence of motion by sensor and signal processing.

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