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Questions tagged [supply-chain]

For questions related to Operations Research approaches for modeling, managing, or optimizing supply chains, systems designed to move goods from where they are produced to where they are consumed.

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Priority based demand fulfilment in Linear Constraint

Say I have 3 sources. D1, D2, D3. their capacity is 100, 200, 400. I want to create some constraints such that First D1 is depleted then D2 and then D3. But the catch is you cant use min or max ...
kunal chakraborty's user avatar
1 vote
0 answers
14 views

Open-Source DES for perishable goods

Can anybody point to examples of using open-source discrete event simulation packages (simpy, salabim, ...
Ralph Asher's user avatar
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0 answers
42 views

Formulation for data insight

There is an interesting data insight question that I want to solve using mathematical programming. I aim to find the combination of features that has the highest impact on the target indicators. We ...
Ying's user avatar
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2 votes
3 answers
113 views

An easy-to-read and engaging book to learn supply chain modelling problems

I recently came across a book on Abstract Algebra by Charles Pinter. I am surprised by its simplicity to explain the concepts. I am very interested in OR problems in supply chain management. I can ...
pg2455's user avatar
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2 votes
0 answers
46 views

Monte Carlo simulation of (potentially) correlated multiple time series

I am seeking help on how to perform Monte Carlo simulations on (potentially) correlated time series. I have a single product (e.g., men's wallets) that are sold out of seven stores in the same city. ...
Ralph Asher's user avatar
3 votes
3 answers
723 views

An efficient method for zoning bins in a warehouse

Let's assume a warehouse with multiple areas, each including either ground or shelf bins. I want to zone bins in this warehouse such that all bins in a zone are as close as possible. Considering that ...
mdslt's user avatar
  • 615
0 votes
2 answers
71 views

What is the official terminology concerning different types of racks?

Thanks to a previous question, I know about this PDF file, containing a lot of terms concerning supply chain management. This list is quite elaborated, but I'm now more specifically looking for ...
Dominique's user avatar
0 votes
0 answers
67 views

Gurobi-Python, unmet demand of customers

I would like to capture the unmet demand by modeling the following constraint with two decision variables. where $QU_{wc}$ is the unmet demand and $QW_{wc}$ the shipped amount of products. I model the ...
Abde's user avatar
  • 81
0 votes
2 answers
197 views

Modelling with Gurobi-Python a Supply Chain Problem

I would like to write the following simple model in GurobiPy, which is part of many terms that's belongs to the objective function, I assumed that I have three suppliers are selected and three ...
Abde's user avatar
  • 81
3 votes
1 answer
96 views

Robust Optimization and Supplier Selection

I would like to incorporate a constraint to my model, this constraint is related to supplier quality or/ reliability selection with respect to efficiency, furthermore, I would like to make the ...
Abde's user avatar
  • 81
1 vote
1 answer
137 views

Pulp: optimization

Given the input data: Stock[pl,p][t] where pl is plant, p is product, ...
user avatar
3 votes
2 answers
127 views

Transportation problem with consolidation within path

There's a supply network design problem that I'm trying to solve, which is as follows: A certain amount of goods need to be transported from point A to B, and can have stoppages in between with a ...
J. Alan's user avatar
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2 votes
1 answer
112 views

What is a transport order in supply chain management?

I arrived at this site as a result of this question. Last week, two colleagues were having a discussion about the term "Transport Order" in supply chain management. (Is it a recursive ...
Dominique's user avatar
2 votes
0 answers
97 views

Supply chain simulation is not working. Any help please?

I am trying to simulate a supply chain scenario. Demand is random (e.g. between 100-400 units) and lead time vary 2 to 4 days for each supply. The holding cost(h), penalty cost (p) for lost_sales, ...
Roger's user avatar
  • 21
2 votes
0 answers
61 views

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: ...
overboxed's user avatar
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3 votes
2 answers
656 views

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

My understanding is Constraint programming (CP) is a sub-set of MILP but in MILP we not only try to find a feasible solution (like CP) but also we should optimize an objective function. I do have a ...
Optimization team's user avatar
2 votes
2 answers
85 views

WIP Inventory Level Constraint?

I'm modeling a continuous-time, two-stage manufacturing process with an MIP. There are about 100 finished-goods SKUs, and each of those belongs to about 25 different semi-finished categories in a ...
Ralph Asher's user avatar
-1 votes
1 answer
45 views

Supply Chain shortage drug Public Data Repository [closed]

I don't know if I'm in the right place but I have a relevant problem. I need a dataset on drug supply shortages because I need it in my graduation thesis. PS: I looked everywhere but couldn't find ...
Lorain M's user avatar
1 vote
2 answers
72 views

Improving Customer First Fulfillment Rate

Data Available: Historical Weekly Demand Total SKU's = ~ 2500 Historical Lead times (Most Suppliers' Shipping from Asia to the US) Problem to solve: Improve First Fulfillment Rate to the Customer ...
Vivek's user avatar
  • 19
1 vote
1 answer
90 views

Where to download SISCO-simulator for integrated supply chain operations

I am trying to find the software called SISCO (Simulator For Integrated Supply Chain Operations). It is developed by Chatfield et al. (2006)1. However, it seemed that the authors did not include the ...
Jayyu's user avatar
  • 173
2 votes
1 answer
137 views

Advanced Transportation optimization problem

I'm trying to explore OR problems and wanted to know what algorithm fits here. Consider fuel stations with lithium ion battery that service replacing battery at each refuel ( you replace your batters ...
themlchic's user avatar
12 votes
4 answers
871 views

Recommendations for OM blogs

Could someone suggest good blogs to follow for researchers in Operations Management/ Supply Chain Management /Operations Research?
Sreekz's user avatar
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5 votes
2 answers
175 views

Procurement and supply management: model-oriented undergradute textbook

I look for an undergraduate-level textbook on procurement and supply management that is largely organized around (reasonably simple) mathematical models. The texts I have reviewed so far are all ...
tvk's user avatar
  • 153
4 votes
1 answer
82 views

Is Multidisciplinary Design Optimization / Collaborative Optimization used anywhere outside of the Mechanical Engineering context?

I recently stumbled across the concept of Multidisciplinary Design Optimization (MDO), sometimes referred to as Multi-Disciplinary Optimization or Multidisciplinary Systems Design Optimization (MSDO), ...
Skander H.'s user avatar
  • 2,139
11 votes
2 answers
208 views

Is a "multistep" or "multiphase" Newsvendor model possible?

I'm trying to address the question of how many times should I order a product from my supplier, assuming highly stochastic demand. In my mind there would be something like the Newsvendor model, but ...
Skander H.'s user avatar
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8 votes
2 answers
123 views

Buyback policy in a supply chain

Consider a three level supply chain consisting of a manufacturer, a wholesaler and a retailer. Suppose I wish to include a buyback contract to this network. Then am I right when I say that wholesaler ...
Harry's user avatar
  • 281
10 votes
3 answers
3k views

Holding cost vs carrying cost vs storage cost

I was reading an article on supply chain management and encountered a number of inventory costs like ordering, carrying, shortage, holding, storage costs. I cannot understand the difference between ...
Harry's user avatar
  • 281
10 votes
1 answer
186 views

Approaches for choosing a "risk" factor in an Inventory Optimization problem?

I'm working on an Inventory Optimization (Allocation) problem. The decision variable is the amount of inventory budget to allocate for each product, from a set of products. My objective is to ...
Skander H.'s user avatar
  • 2,139
14 votes
4 answers
1k views

Good distribution assumptions for customer demand in a supply chain

Why do we normally assume normal distribution/Poisson distribution for customer demand in a supply chain? Are there other good distribution assumptions?
Yinan's user avatar
  • 379
13 votes
2 answers
6k views

Supply Chain Public Data Repository

I was wondering if there is any repository of datasets for supply chain problems. For example, the UC Irvine Machine Learning Repository contains datasets for ML, and MIPLIB is used as a benchmark for ...
Afshin Oroojlooy's user avatar