10 votes

What is the difference bewteen CP and MILP approaches in Job Shop Scheduling?

CP is not a subset of MILP. They are separate modeling/solving paradigms whose domains of application overlap. Both can solve for optimal solutions (in CP's case, by incorporating a constraint that ...
  • 33.8k
3 votes

Transportation problem with consolidation within path

If your demands are per source-destination pairs, then you are very likely dealing with a variation of the multi-commodity flow problem, where each source-destination pair is a commodity. The ...
  • 11.2k
3 votes

What is a transport order in supply chain management?

According to a colleague in supply chain management (who is not 100% confident in his answer), the phrase "transport order" frequently (usually?) means an order to move stock from one ...
  • 33.8k
3 votes

Improving Customer First Fulfillment Rate

Before asking if demand and lead time have a specific distribution (normal or other), you might want to ask whether they have stationary distributions or exhibit trend and/or seasonality. If the ...
  • 33.8k
3 votes

What is the difference bewteen CP and MILP approaches in Job Shop Scheduling?

Google has a very nice library called OR Tools. One of those tools is a CP-SAT solver. Even though their solver works only on integer valued variables it is not that hard to convert MILP models to ...
  • 331
3 votes

WIP Inventory Level Constraint?

What you are trying to do sounds like an MRP (material requirement planning) system. For this, you already need to define the component's precedence relations as a directed graph and apply the stages ...
  • 6,500
2 votes

WIP Inventory Level Constraint?

I assume this is a multiperiod problem. Create a variable $I_{k,t}$ for the inventory of category of category $k$ material available to the second stage at the end of time period $t$. Production ...
  • 33.8k
1 vote

Transportation problem with consolidation within path

I see it more like a variation of Travelling salesman Problem (TSP) with a limit to intervening/transhipment nodes. Gurobi has a solution to that here The formulation goes like this: A,B are src-dest ...
  • 632
1 vote
Accepted

Where to download SISCO-simulator for integrated supply chain operations

The author of this software replied to my inquiry, but unfortunately, the author said he didn't make it freely available. It is a bit old and was developed on Windows XP. It is likely not going to run ...
  • 173
1 vote

Supply Chain shortage drug Public Data Repository

Try plugging "drug shortage" and similar phrases into Google's dataset search engine.
  • 33.8k
1 vote

Improving Customer First Fulfillment Rate

Be careful about using the Normal distribution. It allows for negative values. Lead times are never < 0. Demand is almost never < 0 ( only if product returns > product sales). An obvious ...

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