About Léa, Ph.D.
Articles written by Léa, Ph.D.
How The Grain solves production scheduling problems in minutes with Hexaly October 21, 2024
The Grain is a software company expert in solving production scheduling problems for various industries. They build solutions to provide businesses with real-time insights and actionable recommendations, helping them reach their operational goals. The Grain switched to Hexaly in 2 days and now delivers optimal scheduling in minutes to their clients. Various production scheduling problems…
Hexaly, Gurobi, OR-Tools on the Resource-Constrained Project Scheduling Problem (RCPSP) August 22, 2024
In the Resource-Constrained Project Scheduling Problem (RCPSP), a project consists of a set of tasks that have to be scheduled. Each task has a given duration and cannot be interrupted. There are precedence constraints between the tasks: each task must end before any of its successors can start. There are a set of renewable resources.…
Hexaly, CP Optimizer, OR-Tools, Gurobi, Cplex on very large-scale instances of the Job Shop Scheduling Problem (JSSP) August 21, 2024
In the Job Shop Scheduling Problem (JSSP), a set of jobs has to be processed on every machine in the shop. Each job consists of an ordered sequence of tasks, called activities, each representing the processing of the job by one of the machines. Each job has one activity per machine. Each activity can start…
Hexaly, Gurobi, CP Optimizer on the Simple Assembly Line Balancing Problem (SALBP) August 20, 2024
The Simple Assembly Line Balancing Problem (SALBP) is defined as follows. A set of tasks must be gathered in groups called workstations. Each task requires some time to be processed. For each station, the sum of tasks’ processing times must not exceed a given limit, namely the cycle time. In addition, tasks should be processed according to…
Hexaly holds new records for the Inventory Routing Problem (IRP) August 17, 2024
The Inventory Routing Problem (IRP) is a variant of the Vehicle Routing Problem (VRP) with inventory management. A product, generally liquid or fluid, has to be shipped from a supplier to several customers over a given time horizon. Each customer defines a maximum inventory level. The supplier monitors each customer’s inventory and determines its replenishment…
Hexaly vs Gurobi on the Bin Packing Problem (BPP) August 16, 2024
The Bin Packing Problem is defined as follows. You have to assign items with known weights to bins with uniform capacity. The sum of weights of items assigned to each bin must be lower than its capacity. The objective is to minimize the number of bins used to place all items. On the Bin Packing Problem (BPP),…
How Veolia helps farmers make the soil 8% more fertile with simulation optimization August 15, 2024
Veolia is a French transnational company whose activities include the management, treatment, and disposal of waste, as well as the recycling, reclamation, and re-use of waste products, including compost. Veolia chose Hexaly Optimizer to help them develop a simulation optimization tool to help farmers transition toward smart and sustainable agriculture via organic fertilization. Indeed, selecting…
Hexaly breaks records for the Resource-Constrained Project Scheduling Problem (RCPSP) August 12, 2024
In the Resource-Constrained Project Scheduling Problem (RCPSP), a project consists of a set of tasks that have to be scheduled. Each task has a given duration and cannot be interrupted. There are precedence constraints between the tasks: each task must end before any of its successors can start. There are a set of renewable resources.…
How Les Restos du Cœur solve food distribution problems with Hexaly July 29, 2024
Les Restaurants du Cœur, or Les Restos du Cœur for short (literally Restaurants of the Heart but meaning Restaurants of Love), counting around 75,000 volunteers, is one of the biggest charities in France. The organization targets both homeless and low-income people (single families, elderly people with low pensions, young adults, etc.), helps people find housing,…
How Keolis Santé improves patient transport efficiency with Hexaly June 10, 2024
Keolis Santé is a French company specializing in patient transport. It aims at tackling the challenges of medical transportation in France and innovating in the service of patient mobility. Keolis Santé is part of the Keolis Group, one of the leaders in the shared mobility market around the world. Medical transport is increasingly important in…