A Solution Approach to the Daily Dockworker Planning Problem at a Port Container Terminal

Table 1

The results obtained by both approaches.

Problem size (the number of ships)	Instance	Integrated approach		Sequential approach		Difference in total costs (%)
		G	Z [€] (1)	G	Z [€] (2)
10	1	25	21938.4	34	30470.4	28.00
	2	22	18457.8	30	26653.8	30.75
	3	24	20989.2	34	30469.2	31.11
	4	22	19085.4	30	27958.2	31.74
	5	20	17192.4	30	26116.2	34.17
11	6	22	18137.4	29	27160.2	33.22
	7	27	23799.6	36	32348.4	26.43
	8	25	21904.8	34	30453.6	28.07
	9	25	21902.4	34	29863.2	26.66
	10	24	20963.4	37	33305.4	37.06
12	11	27	23850.0	34	30486.0	21.77
	12	27	23807.4	33	29534.4	19.39
	13	27	23823.0	41	37113.0	35.81
	14	27	23815.2	38	34243.2	30.45
	15	23	20051.4	33	29411.4	31.82
13	16	29	25729.2	40	36157.2	28.84
	17	28	24791.4	37	33323.4	25.60
	18	27	23842.2	35	31450.2	24.19
	19	23	20023.2	36	32371.2	38.15
	20	25	21929.4	32	28883.4	24.08
14	21	28	24764.4	39	35192.4	29.63
	22	32	28572.0	41	37104.0	22.99
	23	32	28568.4	36	32384.4	11.78
	24	33	29511.0	44	39939.0	26.11
	25	33	29539.2	45	40915.2	27.80
15	26	34	30459.0	41	38991.0	21.88
	27	28	24781.2	36	32365.2	23.43
	28	28	24780.0	36	32364.0	23.43
	29	32	28574.4	44	39950.4	28.48
	30	31	27617.4	41	37097.4	25.55
16	31	34	30461.4	41	37097.4	17.89
	32	29	25721.4	36	31645.2	18.72
	33	31	27599.4	40	36131.4	23.61
	34	34	30451.2	41	37087.2	17.89
	35	29	25730.4	35	31598.4	18.57