In order to obtain the availability of roads and bridges after earthquake, a real-time monitoring system is build by wireless sensor networks. And a new key management scheme is proposed to protect the safety of the system. The scheme is based on the polynomial and the Chinese Remainder Theorem, divided into three stages which are system initialization, key establishment, node join and revocation. Analysis shows that the new scheme greatly reduces the storage space and the energy consumption of calculation and communication of node. It is suitable for post-disaster road monitoring system.

In the practical application of developmental internet, often synchronizing Oracle database tables, the establishment of a reliable remote database synchronization scheme is necessary. The paper uses the EXP/IMP logical backup tool of oracle, tuning of EXP/IMP, and combined with shell command, to implement a remote database synchronization scheme. In addition, this program implements the timing of the Oracle database synchronization.