This paper presents basic concept of feature extraction of handwritten Chinese character, and proposes a new feature extraction named superposition mesh weighting factors strokes extracting algorithm to obtain feature of small set handwritten Chinese character.

Investigation and enhancement of cut-paste algorithm in overlapping grid;

To solve the problem in generation of multi-element airfoil grids,the main characteristics and basic flow of the newly emerged cut-paste algorithm which generates overlapping grids by cutting and pasting hole fronts were investigated.

By the use of the overlapping grid technique and symmetric TVD scheme,the laminar flow N-S equation was solved and the flow field of lateral jet interaction for a missile-like wing-body configuration was simulated.

Among this ways, the overlap grid technology is a vive research aspect.

The spoiler moving relative to a stationary airfoil is treated by a dynamic overset grid method.

Then the overset relationship graph is brought forward to control the com-munication order of multi-level overset grids problem.

This technique simplifies the construction of computational grids about complex geometries and allows relative motion between embedded grids.

The flowfield for a rotor a blade in hover was computed using an improved dual time method by numerically solving the compressible Euler and Navier Stokes equations on embedded grids.

Based on the two main functions of GIS, the spatial interpolation and the raster overlay(algebra algorithms), a method has been developed to generate types and distribution of surface sediments automatically from results of the in-door grain-size analyses, and the Cao-Fei-Dian coast has been taken as a case .