An Optimal Hierarchical Decision Model for a Regional Logistics Network with Environmental Impact Consideration

Figure 2

Network representation of the regional logistics system.

(a) Logistics user demand network 𝐺_𝑑=(𝑁_𝑑,𝐴_𝑑)

(b) Logistics service network 𝐺_𝑠=(𝑁_𝑠,𝐴_𝑠)

(c) Logistics service route

(d) Logistics physical network 𝐺_𝑝=(𝑁_𝑝,𝐴_𝑝)