本論文主要是僅利用一個加速度計來擷取使用者的活動訊號，並藉由這些身體活動的加速度特徵來辨別使用者當下的姿態，其功能可以分成兩大項，第一項是步態活動的偵測，包含步數計算以及步態分類，步態分類上我們提供了三種步態的分類，類別有上樓、下樓與平地的走路，第二項是健身活動的偵測，在這個項目中，我們提供伏地挺身、仰臥起坐，另外也偵測站坐轉換的站坐姿勢，我們將會探討裝置在身體的幾個配戴位置上的使用成效如何，主要目的是希望在這健康以及健身流行的時代，提供使用者一個方便配帶與使用且能準確監控身體活動的穿戴式裝置且配合智慧行動裝置作顯示。本篇論文中僅使用單顆三軸加速度計，直接藉由加速度的波形特徵來辨別使用者姿態，且做與該動作相對應的計數偵測，而我們也會探討使用者身體上便於配戴的四個位置(分別為領口、後領、胸前與腰部)在準確度上的表現。

In this paper, we used a single accelerometer to capture user's activity signal and to distinguish the posture of user immediately. There are two main discrimination functions as follow. The first one is gait detection, including step count and gait types classification. There are three types of gait which are going upstairs, going downstairs, and walk. The second function is body build-up activity detection, containing push-up and sit-up. In addition, we also detected the transition from stand to sit of a user and the other way round. We put the propose device at multiple positions of body and to evaluate the performance of each position. The purpose of this paper is to develop a simple, lightweight, and easy-wearing device with multiple functions to monitor the physical activity of user. The detected results were transmitted to the ios mobile phone for display. In this paper, we used a single 3-axis accelerometer to identify user's posture directly based on diagnosing the waveform feature of acceleration data. We placed the proposed device on the user's body at four positions (neckline, back neckline, chest, and waist) respectively and to discuss the performance of each part.

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