alerera
  • Member for 2 years, 7 months
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Well-known parent/child pairs in the field of OR
23 votes

Another father-daughter pair is Matteo Fischetti of U. of Padova and his daughter Martina Fischetti who recently completed her Ph.D. at DTU with David Pisinger. Are we still waiting for mother-child ...

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Why is the programming code of many algorithms not public in the OR community?
23 votes

All answers to this question are opinions. So I will add another one. If you are a researcher and you are good at implementation, you may be able to produce a sequence of papers and results quickly ...

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What is the difference between integer programming and constraint programming?
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16 votes

You have asked a broad question, so I will provide a broad answer. Integer programming typically refers to integer linear programming which is a mathematical modeling and solution paradigm. Decisions ...

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What is the connection of Operations Research and Reinforcement Learning?
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16 votes

In the operations research community, many study dynamic programming models and solution approaches. Since many interesting dynamic programming problems attempt to model information uncertainty over ...

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Are Python and Julia used for optimization in industry?
13 votes

My answer will be focused on teaching, and I'll give you my perspective from Georgia Tech ISyE. Yes, you should teach your students optimization using Python. For simple models, one simple open-...

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Is there a fixed worst-case error bound for farthest-insertion?
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8 votes

To my knowledge, there is yet no known constant worst-case error bound $\eta$ for farthest insertion nor a proof that no constant bound exists. The results you mention here require symmetric TSP ...

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Three newsvendor functions, three optimal solutions—which is correct?
7 votes

This question provides a good example about a common problem we have when teaching newsvendor concepts. In some of the most useful problem settings, it can be tricky for students to properly specify ...

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Sensible and realistic way to model truck based transport costs depending on amount
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6 votes

In my experience, there are two types of logistics modeling questions that require truck transportation costs. In the first, a shipper will operate a fleet of its own vehicles and would like to ...

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Units in the EOQ problem
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6 votes

In the EOQ setting, the total cost incurred during one order cycle is: $$TC = K + \frac{hQ^2}{2 \lambda} \;\;,$$ where the units of $K$ must be only \$ and $Q$ measures the inventory count in items ...

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A variant of the Multiple Traveling Salesman Problem
5 votes

I'd like to add a few more ideas that could be important for solving this problem. I agree that a multiple-vehicle integer programming formulation may be a reasonable approach. In an arc-based model, ...

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splittable multicommodity problem with CPLEX
Accepted answer
3 votes

I think that there might be a straightforward approach here that requires only solving a linear program. Consider the LP arc-flow formulation of multi-commodity network flow; I won't repeat it here ...

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Normal demand and normal lead time; is lead-time demand normal?
3 votes

I've thought about this for a bit, and I now believe that leadtime demand in most common situations is not normally distributed, although it may be as usual a good approximation. Of course, we know ...

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