| Summary: | 碩士 === 國立臺北科技大學 === 電腦與通訊研究所 === 94 === This thesis mainly takes the factory demand as a starting point. It proposes a safety system which integrates environmental monitoring. The equipment of environmental sensor of front end was placed on the fixed position in need of monitoring. It also has capability of short-range wireless communication. The wireless sensor network (WSN) technique is used to make our system more adaptive to the environment of factory. With WSN technique the sensed environmental parameter is transmitted to the data sink via multi-hop relay. The data is then uploaded to the data central server by Internet for environmental monitoring and data management. A power-saving “E-MAC” protocol is used to upload data to sink node to prevent frequent replacement of batteries for wireless environmental sensor nodes which could cause inconvenience to system administrators. Also because of the neighboring nodes, also know as 1-Hop neighbor, may exchange data frequently, we use an edge to represent the path between these two nodes. The edge includes both Down-Link path and Up-Link path. However, the execution of the edge is scheduled by a scheduler assuming that all nodes are synchronized. The sink node determines the schedule for exchanging data in specific time slots to achieve the purpose of power saving.
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