The Bak-Sneppen evolution model is generalized in terms of a new concept and quantity:interaction strength.Based on a quantitative definition,the interaction strength describes the strength of the interaction between the nearest-neighbour individuals in the model.Self-organized criticality is observed for the generalized model with ten different values of interactionstrength.The gap equation governing the self-organization is derived.It is also found that the self-organized threwshold depends on the value of the interaction strength.
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机译：The Three Models of China’s Agricultural Development: Strengths and Weaknesses of the Administrative, Laissez Faire, and Co-op Approaches (中国农业发展三大模式：行政、放任、与合作的利与弊)
