著者

佐川 貢一 煤孫 光俊 大瀧 保明 猪岡 光

出版者

公益社団法人 計測自動制御学会

雑誌

計測自動制御学会論文集 (ISSN:04534654)

巻号頁・発行日

vol.40, no.6, pp.635-641, 2004-06-30 (Released:2009-03-27)

参考文献数

8

被引用文献数

2 4

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Non-restricted estimate of three-dimensional (3D) walk trajectory during indoor locomotion is discussed. The walk trajectory is derived by the integration of the 3D acceleration of subject's foot. A sensor system is composed of an 3D accelerometer, three gyroscops, and one geomagnetic sensor and is attached on the tiptoe. Integral errors of the acceleration and the angular velocity are modified to keep the continuity of the velocity and the posture of the sensor system between the swing phase and the stance phase. Six subjects performed walk experiments including level walk, ascending, and descending in an office building to verify the proposed method. The experimental results show that the estimation error of 3D location to the actual walk distance is less than 10 [%] and the application of the proposed method improves the precise measurement of 3D walk trajectory.

著者

大瀧 保明 鈴木 明宏 張 秀敏 佐川 貢一 永富 良一 猪岡 光

出版者

一般社団法人日本機械学会

雑誌

IIP情報・知能・精密機器部門講演会講演論文集

巻号頁・発行日

vol.2005, pp.341-344, 2005-03-21

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Main objective of this study is to evaluate physical activity by means of a portable device utilizing accelerometers and a barometer. A simple and effective algorithm was proposed to classify physical activities including vertical movements such as stair climbing, and estimates its exercise intensities. The propose method performed successful classifications and feasible estimation of the energy consumption in the experimental study comparing with the measured values of the expiratory gas monitoring system. The result suggested that the correct evaluation of vertical movements made an improvement in the estimation of energy consumptions, which provides better assessment in physical therapies.