基于改进BA模型的城市废弃物资源化共生网络动态演化研究

Dynamic Evolution on Urban Waste Recycling Symbiosis Networks Based on Improved BA Model

发展城市废弃物资源化共生网络,是建设"无废城市"的重要举措。基于对BA模型增长与择优连接规则的修正,构建共生网络结构模型;采用平均场方法,推导共生网络的度分布与幂指数;通过Matlab数值分析,探讨相关因素对共生网络结构形成的影响,从而解释并揭示共生网络的演化机理。研究结果表明:择优连接规则考虑"资源匹配度、节点适应度"等因素作用,能很好地模拟共生网络演化过程;节点连接较高的"机会成本",是导致共生网络具有低幂指数、为亚标度网络的重要原因;区域废弃物相关信息的有效性,对网络结构有着重要影响;并进一步明晰共生网络主要是围绕核心节点所形成的网络。

Promoting the development of urban waste recycling symbiosis networks is an important measure to realize"zero waste city".Based on the modification of the growth and preferential connection rules of BA model,the structure model of symbiosis networks was established;the degree distribution and power exponent of the network were derived by applying the mean field method;through the Matlab numerical analysis,the influence of relevant factors on the evolution of symbiosis networks was discussed to explain and further reveal the law of network evolution.The results show that the evolution process of symbiosis networks can be well simulated when the preferential connection rule take into account such factors as"resource matching and node fitness";the high"opportunity cost"of node connections is the key reason that the network has a low power index and is a sub-scale network;the validity of regional waste information has an important impact on the symbiosis network structure;it is further clarified that the symbiosis networks are mainly formed around the core nodes.