Performance Comparison of Real-Time Yard Crane Dispatching Strategies at Nontransshipment Container Terminals

Table 3

Experimental results of four YC dispatching strategies under two stacking strategies with two vessel schedules.

Vessel calls	Stacking strategy	YC dispatching strategy		GCR
			(¥)	(lifts/h)	(min)	(min)	(min)	(min)	(times)	(min)	(min)	(min)	(min)	(min)	(min)
More (36)	Separate stacking	Nearest truck	119.75	35.70	1.52	0.04	2.20	0.65	385	2.83	5.02	6.02	3.38	2.87	13.91
		Earliest truck	128.83	36.02	1.53	0.02	2.20	0.76	370	2.83	5.15	5.86	3.38	3.69	14.70
		Nearest YT	123.19	36.44	1.51	0.02	2.20	0.66	390	2.83	4.38	6.45	3.38	4.08	14.91
		Earliest YT	129.07	36.66	1.51	0.02	2.20	0.74	380	2.83	4.40	6.39	3.38	4.53	15.32
	Scattered stacking	Nearest truck	119.35	33.78	1.57	0.06	2.21	0.62	-	2.83	6.34	5.24	3.38	3.09	14.67
		Earliest truck	130.10	33.84	1.61	0.02	2.21	0.75	-	2.82	6.46	5.24	3.38	3.95	15.65
		Nearest YT	123.61	35.41	1.53	0.04	2.21	0.64	-	2.83	5.32	5.78	3.38	4.81	15.91
		Earliest YT	130.09	35.43	1.54	0.02	2.21	0.73	-	2.82	5.21	5.90	3.38	5.15	16.26
Less (24)	Separate stacking	Nearest truck	113.37	36.50	1.51	0.03	2.21	0.61	190	2.83	3.92	6.86	3.38	1.60	12.38
		Earliest truck	119.20	36.86	1.51	0.02	2.21	0.69	185	2.83	3.98	6.78	3.38	2.10	12.85
		Nearest YT	114.57	37.09	1.50	0.01	2.21	0.63	165	2.83	3.40	7.24	3.38	1.90	12.54
		Earliest YT	116.92	36.92	1.50	0.02	2.21	0.66	160	2.84	3.56	7.11	3.38	2.08	12.75
	Scattered stacking	Nearest truck	113.50	35.67	1.52	0.03	2.22	0.60	-	2.82	4.89	6.17	3.38	1.82	12.88
		Earliest truck	117.90	35.82	1.53	0.01	2.22	0.67	-	2.83	4.75	6.26	3.38	1.97	12.97
		Nearest YT	114.99	36.61	1.51	0.02	2.22	0.62	-	2.83	4.26	6.55	3.38	2.31	13.11
		Earliest YT	117.66	36.50	1.52	0.01	2.22	0.66	-	2.82	4.18	6.64	3.38	2.35	13.17

GCR: gross crane rate (the total number of QC lifts made/the total number of QC hours beside a busy berth).