In this section of my web page you can find my publications in journals, technical reports, and conference contributions.

Publications in journals

Modeling realistic hybrid flexible flowshop scheduling problems
Rubén Ruiz, Funda Sivrikaya Serifoglu, Thijs Urlings
Computers & Operations Research, Volume 34, Issue 4, April 2008, Pages 1151-1175

Genetic algorithms with different representation schemes for complex hybrid flexible flow line problems
Thijs Urlings, Rubén Ruiz, Funda Sivrikaya Serifoglu
International Journal of Metaheuristics, Accepted April 2009

Shifting representation search for hybrid flexible flow line problems
Thijs Urlings, Rubén Ruiz, Thomas Stützle
European Journal of Operational Research, Submitted July 2009

Conference contributions

An evolutionary approach to realistic hybrid flexible flowshop scheduling problems
Rubén Ruiz, Funda Sivrikaya Serifoglu, Thijs Urlings
Tenth International Workshop on Project Management and Scheduling
Poznan, Poland; April 26 to 28, 2006

Secuenciación mediante algoritmos evolutivos en complejos talleres flexibles
Rubén Ruiz, Thijs Urlings, Funda Sivrikaya Serifoglu
XXIX Congreso Nacional de Estadística e Investigación Operativa
Tenerife, Spain; May 15 to 19, 2006

Heuristics for Higly Constrained Hybrid Flexible Flowshop Scheduling Problems
Thijs Urlings, Rubén Ruiz, Funda Sivrikaya Serifoglu
21st European Conference on Operational Research
Reykjavik, Iceland; July 2 to 5, 2006

Genetic algorithms for complex hybrid flexible flow line problems
Thijs Urlings, Rubén Ruiz, Funda Sivrikaya Serifoglu
Eighth Workshop on Models and Algorithms for Planning and Scheduling Problems
Istanbul, Turkey; July 2 to 6, 2007

Local Search in Complex Scheduling Problems
Thijs Urlings, Rubén Ruiz
First Engineering Stochastic Local Search Algorithms Workshop
Brussels, Belgium; September 6 to 8, 2007

Genetic algorithms for complex hybrid flexible flow line problems
Thijs Urlings, Rubén Ruiz, Funda Sivrikaya Serifoglu
Fourth OR Peripatetic Post-Graduate Programme
Guimarăes, Portugal; September 12 to 15, 2007

Local search engineering for highly constrained hybrid flow line problems
Thijs Urlings, Thomas Stützle, Rubén Ruiz
Eleventh International workshop on Project Management and Scheduling
Istanbul, Turkey; April 28 to 30, 2008

Búsqueda local avanzada para talleres de flujo híbridos altamente restringidos
Thijs Urlings, Rubén Ruiz
XXXI Congreso Nacional de Estadística e Investigación Operativa
Murcia, Spain; February 10 to 13, 2009

A new algorithm for multidimensional scheduling problems
Thijs Urlings, Rubén Ruiz
Nineth Workshop on Models and Algorithms for Planning and Scheduling Problems
Abbey Rolduc, The Netherlands; June 29 to July 3, 2009

A New Algorithm with Shifting Representation for Hybrid Flowline Problems
Thijs Urlings, Rubén Ruiz
23rd European Conference on Operational Research
Bonn, Germany; July 5 to 8, 2009

New Algorithms for the Unrelated Parallel Machine Scheduling Problem
Rubén Ruiz, Luis Fanjul Peyró, Thijs Urlings
23rd European Conference on Operational Research
Bonn, Germany; July 5 to 8, 2009

Data

Here you can download the instances used in all tests. The best found solution values for the small instances and for the large instances are also available here. Please let us know of any improvements on these values, we will mention your name if you can deliver the improved schedule.