無線感測網路(Wireless Sensor Network, WSN)技術被認為是未來新興科技中最重要的一項關鍵技術，透過感測器取得環境的監控資料，並進一步對這些資料進行分析與彙整，以達到環境監控的目的，提供未來災害發生預測與防護等。然而，現行的感測網路所提供的資訊查詢方式僅能針對感測器所產生的觀測資料(raw data)進行條件式查詢，無法提供貼近於一般使用者角度的觀測資訊，該觀測資訊大多需要透過多個觀測值進行一連串的數學運算所產生。本論文提出一個以感測器為中心的資訊查詢機制，讓使用者自訂出所需求的感測元件來表達查詢指令，並產生使用者所感興趣的資訊，而此資訊如同網路服務，除了可透過網際網路被存取外，更可以以組合流程(composite service)的概念來組合更多網際服務以提供更宏觀的資訊。 This work is concerned with the application of wireless sensor network (WSN) technology to monitor physical or environmental conditions, such as temperature, vibration, water level, pressure. The event monitoring system needs to collect various real-time data from spatially distributed sensors and to obtain more information from real world events. In this work, we propose an information query mechanism which is developed based on Service-Oriented Architecture (SOA). It aims at generating more user-centric information by leveraging mathematical operations to compose and analyze those data gathered from each physical sensor.
