Median model
Using multiobjective program or linear objective integer program
to set up P disposal nodes in order to minimize the total
distance between demands and disposal nodes, e.g., Church and
Velle (1974) proposed that the efficiency of a disposal node is determined
by the average distance from the demand to this very node;
ReVelle refined the P-center model to either maximize the number
of customers a disposal node could handle or maximize profits. This
model is applicable to integer program or moderate-scaled locating
cases.
2.2.2. Covering location model
This model could be mainly divided into two directions: (1)
when it is guaranteed that the given demand range is covered, how
to configure the location and number of disposal nodes to minimize
the cost (Schilling et al., 1993; White and Case, 1974); (2) when the
resource is limited, how to configure the given number of disposal
nodes to maximize the demand range (White and Case, 1974; Li
et al., 2013).
2.2.3. Center location model
On the basis of covering location model, in the condition of
limited resource and uncertainty of distance that can be handled,
how to locate to cover all the demand range and simultaneously
minimize the total distanc
Median modelUsing multiobjective program or linear objective integer programto set up P disposal nodes in order to minimize the totaldistance between demands and disposal nodes, e.g., Church andVelle (1974) proposed that the efficiency of a disposal node is determinedby the average distance from the demand to this very node;ReVelle refined the P-center model to either maximize the numberof customers a disposal node could handle or maximize profits. Thismodel is applicable to integer program or moderate-scaled locatingcases.2.2.2. Covering location modelThis model could be mainly divided into two directions: (1)when it is guaranteed that the given demand range is covered, howto configure the location and number of disposal nodes to minimizethe cost (Schilling et al., 1993; White and Case, 1974); (2) when theresource is limited, how to configure the given number of disposalnodes to maximize the demand range (White and Case, 1974; Liet al., 2013).2.2.3. Center location modelOn the basis of covering location model, in the condition oflimited resource and uncertainty of distance that can be handled,how to locate to cover all the demand range and simultaneouslyminimize the total distanc
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