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Tutorial 9 - Solutions (Operations Scheduling)
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Operations Management, Supply Chain Management
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UniversitätsprofessorDr.-Ing. Bernd Hellingrath
Lehrstuhl für Wirtschaftsinformatik
und Logistik
Leonardo-Campus 3
48149 Münster
Tel. +49 251 83-38000
Fax +49 251 83-38009
Hellingrath@ercis.de
Tutorial Operations Management
Operations Scheduling (Part 1)
Solution
Note: Please round to four digits after the decimal point.
Task 1: Order planning (one station)
a)
Sequences (FCFS-Rule)
Processing Time Due Date Starting Time Completion Time Tardiness
No. [h] [h] [h] [h] [h]
1 14 41 0 14 0
2 21 31 14 35 4
3 10 48 35 45 0
4 15 51 45 60 9
5 20 114 60 80 0
6 30 83 80 110 27
57,33
, 2
Gantt-Diagram (FCFS):
Average completion time:
1 N 1
N i1
Ci 14 35 45 60 80 110 57,33[h]
6
Maximum tardiness: 27 [h] (Job 6)
Number of delayed jobs: 3
Costs of tardiness: 3 250[€] 5[€ / h] (4 9 27)[h] 950[€]
b)
Sequences (SPT-Rule)
Processing Time Due Date Starting Time Completion Time Tardiness
No. [h] [h] [h] [h] [h]
3 10 48 0 10 0
1 14 41 10 24 0
4 15 51 24 39 0
5 20 114 39 59 0
2 21 31 59 80 49
6 30 83 80 110 27
53,67
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