| Wireless Sensor Network technology is currently mainly used for regional environment monitoring. it is in order to achieve real-time monitoring of sensing region through the management and processing of sensing data. Users only care about the sensing data itself rather than the sensing networks. Based on this, the data management technology has become the core technology of wireless sensor network. So currently how reasonably storing, transmitting and processing the sensing data has become the mainly research on Wireless Sensor Network. A reasonable data management technology can be achieved not only the physical implementation of data and network separation, but also can reduce the transmission of sensory data, reduce network energy consumption, thus extending the life of the network, improve network performance.According to the developing of monitoring system for dangerous goods'transport, this article designed a centralized data query system model based on Publish\Subscribe mechanism. Main jobs are completed as follows:(1)Abandoning the traditional data query technology, designed a sensor network data query technology based on message model.(2)Improving the traditional Publish\Subscribe message exchange pattern, made it more suitable for sensor network querying system and achieve full transparency for the client; Using subscribing mechanism, made up the data overloading shortcomings of traditional centralized querying system, achieved the sensing data transmission based on the users' requirements, reducing the energy consumption of communication.(3)To resolve the problem of duplicated subscribing, designed a subscribing message restructuring algorithm. Detailed introduced the subscribed agent,the management of subscribing message, the communication server and the gateway communication and data processing in the querying system.(4)Combined the monitoring system for dangerous goods'transport, realized some functions of the querying system model and tested them. |
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