Construction method of decision tree in the dynamic data environment;

Based on the brief introduction on underwater acoustic warfare and its simulation inner & outer China,this paper suggests that is a sound foundation when empiristic model and database of living ocean and propagation,reverberation and noise model which based on underwater acoustic propagation were founded.

The traditional environmental data acquisition system on single-point measurement is unable to provide precise data within the monitored region, and unable to meet accurate measurement requirements.

This thesis was about the application of chemical pattern recognition to acquirement of Chinese traditional medicine fingerprint identification, to estimate of default in environmental data and to searching the environmental polluted sources.

Integrating the status quo of Environmental data sharing in china,the target,frame and major content of SEDC(State Environmental Data Center)Construction have been discussed in this dissertation.

Increase data environment to form programming;

Building CIMS data environment for enterprises group

As for the issue of the foundation of data environment, a method has been established from the viewpoints of information engineer, information resource management and data administration, and the method of IRP.