(0.0,1.2) ; (-0.02,0.025) – (0.0,0) – (0.02,0.025); (0.05,0.0) – (0.05,1.2) ; (0.0,-0.01) arc (180:360:0.05); (0.08,-0.025) – (0.1,0.0) – (0.12,-0.025); (0.1,0.0) – (0.1,1.2) ; (0.08,1.175) – (0.1,1.2) – (0.12,1.175); (0.15,0.0) – (0.15,1.2) ; (0.2,1.21) arc (0:180:0.05); (0.18,1.225) – (0.2,1.2) – (0.22,1.225); (0.2,0.0) – (0.2,1.2) ; (0.18,0.025) – (0.2,0) – (0.22,0.025); (0.25,0.0) – (0.25,1.2) ; (0.2,-0.01) arc (180:360:0.05); (0.28,-0.025) – (0.3,0.0) – (0.32,-0.025); (0.3,0.0) – (0.3,1.2) ; (0.28,1.175) – (0.3,1.2) – (0.32,1.175); (0.35,0.0) – (0.35,1.2) ; (0.4,1.21) arc (0:180:0.05); (0.38,1.225) – (0.4,1.2) – (0.42,1.225); (0.4,0.0) – (0.4,1.2) ; (0.38,0.025) – (0.4,0) – (0.42,0.025); (0.45,0.0) – (0.45,1.2) ; (0.4,-0.01) arc (180:360:0.05); (0.48,-0.025) – (0.5,0.0) – (0.52,-0.025); (0.5,0.0) – (0.5,1.2) ; (0.48,1.175) – (0.5,1.2) – (0.52,1.175); (0.9,0.45) – (0.9,-0.04) – (0.52,-0.04); (0.9,0.74) – (0.9,1.24) – (0.42,1.24); ;

Literature Review {#sec:lit}
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The scheduling of bucket wheel reclaimers in a coal terminal has some similarities to the scheduling of quay and yard cranes in container terminals. When a vessel arrives at a container terminal, import containers are taken off the vessel and mounted onto trucks by quay cranes and then unloaded by yard cranes at various locations in the yard for storage. In the reverse operation, export containers are loaded onto trucks by yard cranes 