According to these concepts,two mathematical models on the shortedge rule are set up.

This paper proposes an algorithm combining statistics with rules,called the priority merger algorithm,which merges phrases by calculating the relationship of words,checks phrases by using phrase rules and a semantic dictionary in grammar and semantics,and recognizes Chinese phrases by the means of hierarchic analysis.

A new point-to-chord distance accumulation for searching negative curvature minimum points of the parts contour curve was proposed, and the contour was decomposed by the negative curvature minimum points combined the short-cut rule.

An Algorithms For Parameters of an Image Irregular Boundary Cir cle;

A new algorithms for parameters of an image irregular boundary circle parameters is presented, which is based on Curve-Approximate Method .

A 2D horizontal mathematical model is established for sediment transport, in which a partial-cell parameter is introduced to treat irregular boundary, the ADI algorithm is used to solve the depth average turbulence equations, the method of spliting operators is used in calculating equations of sediment transport.

With the engineering of a deep foundation pit with irregular perimeter,and considering the problems from many ways such as the environment of existing project,the condition of construction site,the geology of pit and the features of water-beating layers,the paper provides the design thought of control for free stagnant water and porous confined water.