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Questions tagged [logistics]

Logistics refers to the overall process of managing how resources are acquired, stored, and transported to their final destination.

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During a disaster response, operating cost of temporary logistics facilities should be how many times the step up cost of these facilities?

I am optimizing a multi-stage optimization model for disaster response relief delivery. In this regard, I want to know the realistic values of cost parameters related to the operating and setup costs ...
0 votes
0 answers

Determine (in 2 iterations)

A company following the reorder level policy has the following costs associated with a given product: ordering cost of 100 monetary units (u.m.) per order; stock holding cost of 12 u.m. per unit per ...
2 votes
0 answers

Multi Commodity VRP Time Windows Paper

I have been wondering is there any paper that who discuss multi commodity with four index/indices like this formulation below: $$ \begin{gathered} \sum_{k} \sum_{c} F_{j, j, c, k}=1 \quad \forall j \\ ...
2 votes
0 answers

Preprocessing Time Windows Width in Vehicle Routing Problem (VRP)

I think my model takes much time because the time windows width given the problem i want to solve. Here is the time matrix: ...
3 votes
0 answers

How to compute the time required to transport one unit of flow on a given path?

My question is related to freight transportation, but I am stuck on the logic. So, I am considering a path between two points $(a, b)$ where I am sending $n$ trucks where the capacity/truck is $k$. ...
-3 votes
1 answer

What is dynamic facility location problem ans how to formulate the same? Please help [closed]

Please explain how the problem solution looks like. basically I want model to dynamically give me multiple facility locations for a given demand.
4 votes
1 answer

VRP book recommendations

I am looking for a book recommendation on the VRP and variants. I am encountering VRP-like problems more and more in my work and would appreciate a reference.
26 votes
5 answers

What's the current status of the Vehicle Routing Problem in the logistics industry?

After a bit of reading I think I've been able to conclude that state-of-the-art VRP can get solutions for 100~500 stops. My question is around how this actually affects logistics (like Amazon for ...
13 votes
2 answers

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

Different kinds of problems involve transporting an amount $x$ from A to B which results in a cost $c(x)$ in the objective function. Traditionally, often linearized costs are used to get an easy, ...