At the same time,we should standardize PPCC’s circles plot,strengthen its committee’s circles consciousness,consolidate its contingent construction and supervision.

Focusing on the default that in the clustering algorithm based on density the objects are processed from high-density area to low-density area,thereby,the objects with low density can not be identified,a novel clustering algorithm based on boundary identification is proposed through discussing the boundary identification existed in clustering process.

For sake of decreasing classification complexity,a decomposed chunking approach was proposed: first,chunk boundary identification,and then chunk type identification.

A boundary identification problem, i.

Current judgement index of torsional irregularity for building structure—the ratio of floors maximum elastic displacement to average displacement of two ends of the floor can not reflect structure torsional irregularity exactly.