For reducing the spaces of rule database and facilitating users to query,the minimal prediction set is used and mined using maximum frequent item sets which are found by a set-enumeration tree.

This paper improves the methods of observation reduction in non-deterministic planning(NDP) in three aspects:in finding MOS(minimal observation set);in finding out the optimal observation set(OOS) when observations have different costs;and in finding fault-tolerant OOS.

Forecasting geotechnical engineering distortion with least square error forecasting method;

A Simple and Practical Formula of Least Square Forecast;