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港口群内部具有高度复杂的系统结构,以环渤海区域港口群为例,其结构具有明显同质化的趋势,区域内已经形成了以天津港、大连港、青岛港为代表三个子港口群之间的激烈竞争关系的格局,因此,研究港口群的系统结构对于港口群的建设和发展具有重大意义。分形及关联维港口货物月吞吐量时间序列为{xi}(i=1,2,…,N),先对其重构相空间Xi=(xi,xi+τ,…,xi+(m-1)τ),其中,m为嵌入维,τ为延迟时间,n=N-(m-1)τ,由此得到
The port complex has a highly complex system structure. Taking the port group in the Bohai Rim as an example, the structure has obvious homogeneity trend. Within the area, there are three sub-port groups represented by Tianjin Port, Dalian Port and Qingdao Port Therefore, it is of great significance to study the system structure of port group for the construction and development of port group. The time series of the monthly throughput of the fractal and related dimension port goods is {xi} (i = 1,2, ..., N). The reconstruction phase space Xi = (xi, xi + τ, ..., xi + ) τ), where m is the embedding dimension, τ is the delay time, and n = N- (m-1) τ, resulting in