#ORMS

2025-06-09

Efficient jury empanelling: Respecting people's time

This article is inspired by a recent experience of being summoned for jury service. We describe a simulation model of the jury selection process. The goal is to explore how the needs of the justice system can be met while also respecting the time of people who report for jury service. Specifically, we want to see if the number of people summoned can be reduced while ensuring that sufficient people are available for the scheduled trials.

Jury service is an important civic duty, providing a way for people to directly participate in upholding the law and contribute to their community. But the jury service process, like much of the justice system, is designed around the needs of the system rather than the needs of the people it serves.

#orms #Python
solvermax.com/blog/efficient-j

Justitia, godless of justice
2025-05-25

Last week, the 2025 Edition of our “Current Data Science for Business Students Meet Alumni” Event took place at the Facultyof Economics and Business Administration (Ghent University). #ORMS #DataScience #DataAnalytics #Python #ApacheSpark #SQL

linkedin.com/pulse/current-ds4

Marco Lübbeckemluebbecke@mas.to
2025-05-23

final day of our 2025 school on column generation in Paris #orms

group of about 100 students on a staircase
2025-05-03

The muffin problem: A slice of recreational maths

In this article, we solve 'The Muffin Problem' which is a recreational maths puzzle that is simple to state but hard to solve in general.

The goal of the muffin problem is to divide a number of muffins equally between a number of students, maximizing the size of the smallest piece that any student receives. Some cases are trivial, while some others are easy. But once we have more than a few muffins and/or students, this becomes a difficult problem to solve.

We use a Mixed Integer Linear Program to solve the problem. Along the way we play with some parallel computing to substantially reduce the run time, and throw in some symmetry-breaking constraints and objective function bounds to help the solver.

#orms #Python
solvermax.com/blog/the-muffin-

A sliced chocolate muffin
2025-04-02

Pivot irrigators in a 100 acre field

We formulate a non-linear, non-convex model for optimizing the layout of centre-pivot irrigators in a field. Several free and commercial solvers fail to find good solutions. Then we try the MINLP-BB solver via NEOS using a multi-start technique.
Can it find an optimal solution?
#python #orms
solvermax.com/blog/pivot-irrig

Pivot irrigator
Braden Douglassbraidn@ruby.social
2025-03-30

I constantly see folks select ActiveRecord when going the #notRails route. I just don’t understand it when there are benchmarks like the following: ideia.me/benchmarking-ruby-orm

#postgres #performance #orms

Marco Lübbeckemluebbecke@mas.to
2025-03-27

Job opening at TU Graz: Full Professor Position for Computational Discrete Mathematics #orms

jobs.tugraz.at/en/jobs/dec7b34

2025-03-07

Locational marginal pricing of potatoes

We apply Locational Marginal Pricing (LMP) to the supply of potatoes. The article describes the model, calculation of LMPs, and scenarios for how the suppliers and contractors may respond to the price signals.
#orms #pyomo
solvermax.com/blog/locational-

Washed potatoes, ready for chopping into French Fries.
Bartolomeo Stellatobstellato
2025-02-26

🚀 Gave a talk at the EURO OSS Seminar Series on "Data-Driven Algorithm Design and Verification for Parametric Convex Optimization"!

🎥 Recording: euroorml.euro-online.org/

Big thanks to Dolores Romero Morales for the invitation! 🙌

Marco Lübbeckemluebbecke@mas.to
2025-02-14

Jacques Desrosiers delivered the sad news that an #orms giant has left us forever:

François Soumis passed away last night. The depot of this last vehicle tour is in heaven.

2025-02-07

Permission granted: A role mining model

We implement a recently published role mining model using both constraint programming and mixed integer linear programming, then compare their relative performance while solving several examples.
solvermax.com/blog/permission-
#orms #pyomo #ortools #python

Assigning a matrix of people to roles
2025-02-06

New item in our list of #orms resources:

Collection of videos from Associate Professor Alberto Del Pia, University of Wisconsin-Madison.
There are around 100 videos, collated into playlists relating to specific optimization papers taught at the university.
solvermax.com/resources/links/

Illustration of cutting plane in linear programming
2025-02-06

Today, we are at the 2025 Flanders Make Scientific Conference in Leuven. CVAMO also has several posters at the event. It’s a great event for scientific networking. #FlandersMake #ORMS #MANPROCAD #REMASC #CVAMO

Flanders Make Poster at the 2025 Scientific ConferenceFlanders Make Poster at the 2025 Scientific ConferenceFlanders Make Poster at the 2025 Scientific Conference
Marco Lübbeckemluebbecke@mas.to
2025-01-31
Michael Stiglmayrmstiglmayr@mathstodon.xyz
2025-01-27

Celebrating the 50th birthday of EURO - the Association of European Operational Research Societies. #orms

Marco Lübbeckemluebbecke@mas.to
2025-01-27

The Association of European Operational Research Societies (EURO) celebrates its 50th birthday today! #orms #ORawarenessDay #EURO50thbday

buff.ly/40w6fQu

Marco Lübbeckemluebbecke@mas.to
2025-01-08

one of my master's students displayed (wide and very long) heat maps in his thesis that always looked like knitting patterns to me; I suggested to him to make a scarf out of this.

well he did. thank you, Alex, for a very very nice gift! #orms

2025-01-07

Optimal rational approximation using SciPy

In this article we solve a non-linear curve fitting problem using the SciPy library. SciPy is especially well-suiting to solving this type of problem, as it includes a variety of functions for fitting and optimizing non-linear functions.

Along the way, we illustrate how to use SciPy's curve_fit and minimize functions for this type of task. In addition, we look at some good practices to apply when solving this type of problem.
#python #scipy #orms
solvermax.com/blog/optimal-rat

Statue of mathematician-astronomer Aryabhata
2024-12-07

Heading to Vancouver, BC (Canada) for the #NeurIPS Conference to represent Ghent University’s Data Science for Business Program @NeurIPSConf #GenAI #AI #GenerativeAI #orms #DataScience #DS4B #NeurIPS24

2024-12-05

Today’s Session of my Big Data Analytics Class is a guest lecture by Element61 professionals discussing ML projects in the real world. It has become a yearly tradition. #orms #DS4B #DataScience #DataAnalytics #Datalake #AzureDataFactory #orchestration tool #Azure

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