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中文摘要：
在基本BA无标度网络模型的基础上，提出了双向演化模型，其演化机制中既有新边增加又有旧边删除．理论证明此改进模型的度分布服从幂律分布且幂指数为1〈Y〈3，拓宽了模型的应用范围．数值仿真验证了理论分析的正确性．而且与基本BA模型相比，双向演化模型生成网络的平均路径长度较小，聚类系数较大，较符合实际网络．
英文摘要：
Based on the BA scale-free network model, the two-way evolution model of a BA scale-free network is given, which considers both new edges increasing and old edges removing. Theoretical deduc- tion suggests that the model obeys power distribution and the power exponent is between 1 and 3, which broaden the range of application. With three essential statistical values＇ computer simulations of the algo- rithm, the characteristics of the real network are emerged in the model including small world characteris- tics and small average path length, by contrast of the basic BA model.
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