Search Results for author: Patrick De Causmaecker

Found 9 papers, 3 papers with code

Features for the 0-1 knapsack problem based on inclusionwise maximal solutions

1 code implementation16 Nov 2022 Jorik Jooken, Pieter Leyman, Patrick De Causmaecker

We show that the proposed features contain important information related to the empirical hardness of a problem instance that was missing in earlier features from the literature by training machine learning models that can accurately predict the empirical hardness of a wide variety of 0-1 knapsack problem instances.

A prediction-based approach for online dynamic patient scheduling: a case study in radiotherapy treatment

no code implementations16 Dec 2021 Tu-San Pham, Antoine Legrain, Patrick De Causmaecker, Louis-Martin Rousseau

When our prediction-based approach is compared to flat-reservation policies, it does a better job of preventing overdue treatments for emergency patients, while also maintaining comparable waiting times for the other patients.

regression Scheduling

Neural Networked Assisted Tree Search for the Personnel Rostering Problem

no code implementations24 Oct 2020 Ziyi Chen, Patrick De Causmaecker, Yajie Dou

The personnel rostering problem is the problem of finding an optimal way to assign employees to shifts, subject to a set of hard constraints which all valid solutions must follow, and a set of soft constraints which define the relative quality of valid solutions.

valid

Exploring search space trees using an adapted version of Monte Carlo tree search for combinatorial optimization problems

2 code implementations22 Oct 2020 Jorik Jooken, Pieter Leyman, Tony Wauters, Patrick De Causmaecker

The algorithm is based on Monte Carlo tree search, a popular algorithm in game playing that is used to explore game trees and represents the state-of-the-art algorithm for a number of games.

Combinatorial Optimization Scheduling

Evolving test instances of the Hamiltonian completion problem

1 code implementation5 Oct 2020 Thibault Lechien, Jorik Jooken, Patrick De Causmaecker

Predicting and comparing algorithm performance on graph instances is challenging for multiple reasons.

Solving the Steiner Tree Problem in graphs with Variable Neighborhood Descent

no code implementations13 Jun 2018 Matthieu De Laere, San Tu Pham, Patrick De Causmaecker

The Steiner Tree Problem (STP) in graphs is an important problem with various applications in many areas such as design of integrated circuits, evolution theory, networking, etc.

Steiner Tree Problem

A MIP Backend for the IDP System

no code implementations2 Sep 2016 San Pham, Jo Devriendt, Maurice Bruynooghe, Patrick De Causmaecker

The IDP knowledge base system currently uses MiniSAT(ID) as its backend Constraint Programming (CP) solver.

Characterization of neighborhood behaviours in a multi-neighborhood local search algorithm

no code implementations12 Mar 2016 Nguyen Thi Thanh Dang, Patrick De Causmaecker

In this work, we propose a systematic method to characterize each neighborhood's behaviours, representing them as a feature vector, and using cluster analysis to form similar groups of neighborhoods.

SMAC+

Second International Nurse Rostering Competition (INRC-II) --- Problem Description and Rules ---

no code implementations17 Jan 2015 Sara Ceschia, Nguyen Thi Thanh Dang, Patrick De Causmaecker, Stefaan Haspeslagh, Andrea Schaerf

In this paper, we provide all information to participate to the Second International Nurse Rostering Competition (INRC-II).

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