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Self-organized criticality(SOC) was introduced by Per Bak in
1988. When thesystem reaches the critical state by SOC process,
any minor perturbation might cause catastrophe. Bak proposed
sandpile model to illustrate theidea of SOC. He used height
difference to be a basic quantity. In this paper,we used height
to be a basic quantity and compared to the results of
experiments. The data demonstrates that randomness is a prime
factor toform the power law.
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