常记新理念地理教学莫落后

虽然新的课程改革已经吹响了号角，但是地理学科还是没有被彻底拯救出来，没有得到解放，和其他学科相比，处于劣势地位。作为初中地理教师，我们应该以大局为重，以祖国的未来为重，以人才的含金量为重，摆正观念，更新思想，把地理教学不折不扣地当成一项主科来对待，千万不要荒废。

The Design and Implementation of Wireless Navigation System Based on WMN in Coal Mines

Underground staff always be threatened with flood, gas explosions, hazardous gas leaking and other accidents. For the purpose of facilitating the work of searching and rescuing personnel in the event of an accident, they often need to be equipped with navigation system. However, the existed navigation system based primarily on the earth, neglecting the complicated underground environment, so the general positioning and navigation system is no longer applicable. According to underground radio channel environment and Mesh network protocol, a suitable underground positioning and navigation system is designed. The system combined the received signal strength of the device and the basic service set identiifer of the network access point device （MAP）, positioning the workers. Using eSuperMap development platform and WinCE embedded operating system, complement the navigation of underground workers on the basis of positioning. It also includes an electronic map operations, information, path analysis and navigation functions. Featured presentations on the S3C2400 which simulated the underground environment. Basically achieve the desired functionality, make convenience for location and navigation.