無線感測網路中介平台之設計與實作─應用於動作感知

動作感知(Action-Aware)平台提供使用者以肢體移動的操作方式與系統進行互動，減少手指觸擊按鍵的使用。其原理運用三軸加速度感測器(Triaxial Accelerometer)感知人體活動之加速度訊號，即時傳送到接收設備並立即在螢幕上回饋相關訊息給使用者，為避免操作之不便性，感知設備訊號以無線的方式來傳遞，此類系統已逐漸用於遊戲、姿態操控與跌倒偵測等應用，然而卻產生軟體系統無法用於各式平台之問題。本論文建構一Action-Aware System (A2S)，提供相容於多種平台之動作感知應用，主要作法為實作中介系統於各式感知平台，並於本研究之中介平台建構姿態感知於操控家電與跌倒偵測應用。本研究實作之平台於(1)具加速度感知功能之智慧型手持式平台包括HTC Diamond與Openmoko，以及(2)無線感測器系統包括Intel iMote2、Crossbow與MoteIV Tmote，相容之嵌入式系統包括Windows Mobile、Google Android、.NET Micro Framework與TinyOS，並於無線感測器通訊實現相容的封包格式，使不同廠牌也能協同運作，增進中介平台使用者之便利性，無需限定無線感測器廠牌。本論文以兩種方法(1)固定式與(2)活動式實作跌倒偵測系統，固定式將感測器以限定方式裝置於身上，以角度判定跌倒，適用於無線感測器平台，活動式則允許使用者隨意方式放置感測器至口袋，以門檻值判定跌倒，此門檻值由5位受測者於實驗環境跌倒400次來建立，適用於智慧型手持式平台。

關鍵字

活動感知；跌倒偵測；無線感測網路；加速度計；中介平台

並列摘要

Action-Aware platform is employed that users interact with system by changing gestures, and to reduce pressing times of button. The principle uses accelerometers to sense signals of body activities and sends it to a receiving device, and then the device displays a feedback message instantly. To decrease an inconvenient control of accelerometer, the signal is transmitted through wireless. Such systems have been utilized for many applications such as games, motion commands, and fall detection, but the system has not compatibly many sensing platforms. This work proposes an Action-Aware System (A2S) which implements action-aware applications on multi-platform. The way is to build a middleware for many sensing hardware, and to develop many applications such as games, motion commands on household appliances, and fall-down detection on the middleware. A2S is achieved on intelligent devices which are embedded with the accelerometer such as HTC Diamond and Openmoko and wireless sensors which include Intel iMote2, Crossbow and MoteIV Tmote, and work compatibly with many embedded systems have Windows Mobile, Google Android, .NET Micro Framework and TinyOS. A2S also implements compatible packet format on wireless sensor communication of different brands, it not only satisfies coordination action between sensors of differential brand but also increases user convenience on the middleware. This research implements fall-down detection system in two ways restricted place and unrestricted place. The former way is to place a sensor in restricted place of body, and utility angle which is calculated by acceleration to detect fall-down, the way is suit for platforms of wireless sensor. The latter way is to place a sensor in unrestricted place such as pocket, and employs a specific threshold to recognize fall-down. Five volunteers were invited to simulate fall-down over 400 times to gather statistics and to build the fall-down acceleration threshold, this test way is fit for intelligence devices.

並列關鍵字

Action-Aware ； Fall Detection ； WSN ； Accelerometer ； Middleware

參考文獻

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無線感測網路中介平台之設計與實作─應用於動作感知

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