1.224 Recitation #5 Transit crew scheduling. Agenda ‧ HASTUS ‧ Set partitioning ‧ Column generation ‧ Athena

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Presentation transcript:

1.224 Recitation #5 Transit crew scheduling

Agenda ‧ HASTUS ‧ Set partitioning ‧ Column generation ‧ Athena

HASTUS Decomposition – HASTUS-BUS – HASTUS-MACRO – HASTUS-MICRO

HASTUS-Macro Input : blocks Relaxations: Fractional drivers, 30 minute partitioning Neglect travel time (to and from relief points) HASTUS-Macro List of pieces that provide Cheap way of covering blocks

HASTUS-Micro Input : output from HASTUS-Macro 3 steps: 1) Partition vehicle blocks close to macro solution 2) Hook the pieces together (as seen in class) 3) Marginal improvement phase HASTUS-Micro Good workable crew schedule

Micro, step 2 Pieces are nodes…

Adding tripper runs

Compare HASTUS to HW Where does column generation fit in? What is column generation???

ATHENA ‧ Source.path file ‧ Cutting and pasting into emacs ‧ Use loqo if it takes too long ‧ IF and AND finally get to be used in EXCEL!