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This paper has been withdrawn by the author(s), due to the existence of a much better paper in http://arxiv.org/abs/cs.CR/0207027

This paper has been withdrawn by the author due to a errors in figure 3,4

This paper has been withdrawn by the authors.

This paper has been retracted.

This paper has been withdrawn

This paper has been withdrawn by the author.

This paper has been withdrawn by the author due to a crucial error in one of equation in (3).

This paper has been withdrawn by the author(s), due a crucial sign error in conclusion .

This paper has been withdrawn by the authors due to new experimental results.

This paper has been withdrawn by the author due to a crucial sign error.

This paper has been withdrawn by the author due to a crucial errors.

This paper has been withdrawn by the author due to an error.

This paper has been withdrawn because the Editor of Electronical Journal of Statistics declined the paper.

This paper has been withdrawn by the author.

The paper has been withdrawn.

This paper has been withdrawn.

This paper has been withdrawn by the author [arXiv admin].

This paper has been withdrawn by the author.

This paper has been withdrawn by the author.

This paper has been withdrawn by the authors because the paper is largely revised and improved, and to appear in Mechanics Research Communications.