Location model problem began in 1909. Alfred Weberk considered
about how to select the location of a warehouse to minimize
the total distance from customers; on the ground of that, Hakimi
(1964) explored where to set up contact and help centers in the
highway system to minimize the total distance between people and
the nearest center. After him, the selection approach about static
center location is classified into three models: median model, covering
location model (Church and Velle, 1974) and center model
(Owen and Daskin, 1998)