Job Shop scheduling - Priority Rules Machine Scheduling
23 important questions on Job Shop scheduling - Priority Rules Machine Scheduling
What is job shop?
What is the definition of exact and heuristic?
Algorithm guaranteed to find the optimal solution
Heuristic
Algorithm without guarantee to find an optimal solution
Why do we use heuristics for machine scheduling problems?
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What are the heuristics for the machine scheduling problem? [3] (also add the subproblem)
- Constructive
- priority rule scheduling
- Make feasible
- Improve feasible
- local search
Priority rule scheduling, does SPT lead to an optimal solution can this be proven?
Priority rule scheduling, what is WSPT and explain?
Wij/pij
Priority rule scheduling, what is MS and explain
Priority rule scheduling, MS, How is the slack computed?
IMPORTANT THE SLACK IS RECOMPUTED IN EVERY STEP
Priority rule scheduling, what is SST and explain
Priority is determined by the amount of setup time required.
Priority rule scheduling, what is LNS and explain?
Priority is determined by the number of successors an operation has.
Priority rule scheduling, what is SQNO and explain?
Priority is determined by the queue length of the machine on which the succeeding operation needs to be performed.
Priority rule scheduling, With what should a priority rule comply?
Priority rule scheduling, What priority rule is used when due date performance is important?
Priority rule scheduling, What are composite priority rules, why do we use these?
Priority rule scheduling, What is ATC?
Priority rule scheduling, What rules does ATC combine?
Generation schemes, what are generation schemes?
Generation schemes, What are generation schemes for the machine scheduling problem?
Generation schemes, What are generation schemes for the vehicle routing problem?
route-first cluster-second vs cluster-first route-second
Generation scheme-machine scheduling serial
From what set is an operation added and how?
Priority rule scheduling, Why is a classification rule useful?
Priority rule schedule what is static and what is dynamic, give examples? [2]
The priority value of operations do not change during the execution of the priority rule (EDD, LNS)
Dynamic
The priority value of operations may change during the execution of the priority rule (SST, SQNO)
Priority rule schedule, what is local [2] and what is global [1], give examples.
Only information available about the current operation and machine on which this operation is processed (EDD, SST)
Global
Uses information on other operations or machines (SQNO)
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