Stefan Ruzika

According to our database, Stefan Ruzika authored at least 70 papers between 2006 and 2024.

Collaborative distances:

• Dijkstra number of four.
• Erdős number of three.

2024

Harnessing large language models to develop research-based learning assistants for formative feedback.

Steffen Steinert, Karina E. Avila, Stefan Ruzika, Jochen Kuhn, Stefan Küchemann

Smart Learn. Environ., December, 2024

The Weighted p-Norm Weight Set Decomposition for Multiobjective Discrete Optimization Problems.

Stephan Helfrich, Kathrin Prinz, Stefan Ruzika

J. Optim. Theory Appl., September, 2024

Using scalarizations for the approximation of multiobjective optimization problems: towards a general theory.

Stephan Helfrich, Arne Herzel, Stefan Ruzika, Clemens Thielen

Math. Methods Oper. Res., August, 2024

Approximating multiobjective optimization problems: How exact can you be?

Cristina Bazgan, Arne Herzel, Stefan Ruzika, Clemens Thielen, Daniel Vanderpooten

Math. Methods Oper. Res., August, 2024

Real-time Prediction of Students' Math Difficulties using Raw Data from Eye Tracking and Neural Networks.

Kathrin Kennel, Stefan Ruzika

Proc. ACM Hum. Comput. Interact., 2024

Parametric matroid interdiction.

Nils Hausbrandt, Oliver Bachtler, Stefan Ruzika, Luca E. Schäfer

Discret. Optim., 2024

Lessons Learned from Designing an Open-Source Automated Feedback System for STEM Education.

Steffen Steinert, Lars Krupp, Karina E. Avila, Anke S. Janssen, Verena Ruf, David Dzsotjan, Christian de Schryver, Jakob Karolus, Stefan Ruzika, Karen Joisten, Paul Lukowicz, Jochen Kuhn, Norbert Wehn, Stefan Küchemann

CoRR, 2024

2023

Approximating biobjective minimization problems using general ordering cones.

Arne Herzel, Stephan Helfrich, Stefan Ruzika, Clemens Thielen

J. Glob. Optim., June, 2023

Analysis of the weighted Tchebycheff weight set decomposition for multiobjective discrete optimization problems.

Stephan Helfrich, Tyler A. Perini, Pascal Halffmann, Natashia Boland, Stefan Ruzika

J. Glob. Optim., June, 2023

p-median location interdiction on trees.

Lena Leiß, Till Heller, Luca E. Schäfer, Manuel Streicher, Stefan Ruzika

CoRR, 2023

Automated Detection of Geometric Structures in Gaze Data.

Lynn Knippertz, Anna L. Münz, Stefan Ruzika

Proceedings of the 2023 Symposium on Eye Tracking Research and Applications, 2023

2022

Multi-criteria optimization in industry.

Karl-Heinz Küfer, Kaisa Miettinen, Stefan Ruzika, Serpil Sayin

OR Spectr., 2022

The Power of the Weighted Sum Scalarization for Approximating Multiobjective Optimization Problems.

Cristina Bazgan, Stefan Ruzika, Clemens Thielen, Daniel Vanderpooten

Theory Comput. Syst., 2022

An approximation algorithm for a general class of multi-parametric optimization problems.

Stephan Helfrich, Arne Herzel, Stefan Ruzika, Clemens Thielen

J. Comb. Optim., 2022

An approximation algorithm for a general class of parametric optimization problems.

Cristina Bazgan, Arne Herzel, Stefan Ruzika, Clemens Thielen, Daniel Vanderpooten

J. Comb. Optim., 2022

A machine learning based algorithm selection method to solve the minimum cost flow problem.

Philipp Herrmann, Anna Meyer, Stefan Ruzika, Luca E. Schäfer, Fabian von der Warth

CoRR, 2022

Teaching Mathematical Modeling with Computing Technology: Presentation of a Course based on Evacuations.

André Greubel, Hans-Stefan Siller, Stefan Ruzika, Lynn Knippertz

Proceedings of the WiPSCE '22: The 17th Workshop in Primary and Secondary Computing Education, Morschach, Switzerland, 31 October 2022, 2022

2021

On the hardness of covering-interdiction problems.

Nicolas Fröhlich, Stefan Ruzika

Theor. Comput. Sci., 2021

One-exact approximate Pareto sets.

Arne Herzel, Cristina Bazgan, Stefan Ruzika, Clemens Thielen, Daniel Vanderpooten

J. Glob. Optim., 2021

Approximation Methods for Multiobjective Optimization Problems: A Survey.

Arne Herzel, Stefan Ruzika, Clemens Thielen

INFORMS J. Comput., 2021

The binary knapsack problem with qualitative levels.

Luca E. Schäfer, Tobias Dietz, Maria Barbati, José Rui Figueira, Salvatore Greco, Stefan Ruzika

Eur. J. Oper. Res., 2021

2020

A Reduced-Complexity Projection Algorithm for ADMM-Based LP Decoding.

Florian Gensheimer, Tobias Dietz, Kira Kraft, Stefan Ruzika, Norbert Wehn

IEEE Trans. Inf. Theory, 2020

On the rectangular knapsack problem: approximation of a specific quadratic knapsack problem.

Britta Schulze, Michael Stiglmayr, Luís Paquete, Carlos M. Fonseca, David Willems, Stefan Ruzika

Math. Methods Oper. Res., 2020

An inner approximation method to compute the weight set decomposition of a triobjective mixed-integer problem.

Pascal Halffmann, Tobias Dietz, Anthony Przybylski, Stefan Ruzika

J. Glob. Optim., 2020

Shortest paths with ordinal weights.

Luca E. Schäfer, Tobias Dietz, Nicolas Fröhlich, Stefan Ruzika, José Rui Figueira

Eur. J. Oper. Res., 2020

Introducing multiobjective complex systems.

Tobias Dietz, Kathrin Klamroth, Konstantin Kraus, Stefan Ruzika, Luca E. Schäfer, Britta Schulze, Michael Stiglmayr, Margaret M. Wiecek

Eur. J. Oper. Res., 2020

On the Bicriterion Maximum Flow Network Interdiction Problem.

Luca E. Schäfer, Stefan Ruzika, Sven O. Krumke, Carlos M. Fonseca

CoRR, 2020

The two player shortest path network interdiction problem.

Simon Busan, Luca E. Schäfer, Stefan Ruzika

CoRR, 2020

The {0, 1}-knapsack problem with qualitative levels.

Luca E. Schäfer, Tobias Dietz, Maria Barbati, José Rui Figueira, Salvatore Greco, Stefan Ruzika

CoRR, 2020

On the <i>p</i>-hub interdiction problem.

Thomas Ullmert, Stefan Ruzika, Anita Schöbel

Comput. Oper. Res., 2020

Sparsifying parity-check matrices.

Luís M. S. Russo, Tobias Dietz, José Rui Figueira, Alexandre P. Francisco, Stefan Ruzika

Appl. Soft Comput., 2020

2019

On the Universal Near-Shortest Simple Paths Problem.

Luca E. Schäfer, Andrea Maier, Stefan Ruzika

CoRR, 2019

The Bicriterion Maximum Flow Network Interdiction Problem in <i>s</i>-<i>t</i>-Planar Graphs.

Luca E. Schäfer, Tobias Dietz, Marco V. Natale, Stefan Ruzika, Sven O. Krumke, Carlos M. Fonseca

Proceedings of the Operations Research Proceedings 2019, 2019

An FPTAS for a General Class of Parametric Optimization Problems.

Cristina Bazgan, Arne Herzel, Stefan Ruzika, Clemens Thielen, Daniel Vanderpooten

Proceedings of the Computing and Combinatorics - 25th International Conference, 2019

2018

A Low-Complexity Projection Algorithm for ADMM-Based LP Decoding.

Florian Gensheimer, Tobias Dietz, Stefan Ruzika, Kira Kraft, Norbert Wehn

Proceedings of the 10th IEEE International Symposium on Turbo Codes & Iterative Information Processing, 2018

Improved Maximum-Likelihood Decoding Using Sparse Parity-Check Matrices.

Florian Gensheimer, Tobias Dietz, Stefan Ruzika, Kira Kraft, Norbert Wehn

Proceedings of the 25th International Conference on Telecommunications, 2018

2017

A general approximation method for bicriteria minimization problems.

Pascal Halffmann, Stefan Ruzika, Clemens Thielen, David Willems

Theor. Comput. Sci., 2017

Shortest Paths with Shortest Detours - A Biobjective Routing Problem.

Carolin Torchiani, Jan Ohst, David Willems, Stefan Ruzika

J. Optim. Theory Appl., 2017

A coverage-based Box-Algorithm to compute a representation for optimization problems with three objective functions.

Tobias Kuhn, Stefan Ruzika

J. Glob. Optim., 2017

Approximation schemes for the parametric knapsack problem.

Alberto Giudici, Pascal Halffmann, Stefan Ruzika, Clemens Thielen

Inf. Process. Lett., 2017

On a Technique for Finding Running Tracks of Specific Length in a Road Network.

David Willems, Oliver Zehner, Stefan Ruzika

Proceedings of the Operations Research Proceedings 2017, 2017

2016

Evacuation modeling: a case study on linear and nonlinear network flow models.

Simone Göttlich, Sebastian Kühn, Jan Peter Ohst, Stefan Ruzika

EURO J. Comput. Optim., 2016

Hypervolume Subset Selection in Two Dimensions: Formulations and Algorithms.

Tobias Kuhn, Carlos M. Fonseca, Luís Paquete, Stefan Ruzika, Miguel Duarte, José Rui Figueira

Evol. Comput., 2016

ADMM versus simplex algorithm for LP decoding.

Florian Gensheimer, Stefan Ruzika, Stefan Scholl, Norbert Wehn

Proceedings of the 9th International Symposium on Turbo Codes and Iterative Information Processing, 2016

2014

A simplex algorithm for LP decoding hardware.

Florian Gensheimer, Stefan Ruzika, Stefan Scholl, Norbert Wehn

Proceedings of the 25th IEEE Annual International Symposium on Personal, 2014

Efficient maximum-likelihood decoding of linear block codes on binary memoryless channels.

Michael Helmling, Eirik Rosnes, Stefan Ruzika, Stefan Scholl

Proceedings of the 2014 IEEE International Symposium on Information Theory, Honolulu, HI, USA, June 29, 2014

2013

Towards An Exact Combinatorial Algorithm for LP Decoding of Turbo Codes

Michael Helmling, Stefan Ruzika

CoRR, 2013

Multiple objective branch and bound for mixed 0-1 linear programming: Corrections and improvements for the biobjective case.

Thomas Vincent, Florian Seipp, Stefan Ruzika, Anthony Przybylski, Xavier Gandibleux

Comput. Oper. Res., 2013

Towards combinatorial LP turbo decoding.

Michael Helmling, Stefan Ruzika

Proceedings of the 2013 IEEE International Symposium on Information Theory, 2013

2012

Mathematical Programming Decoding of Binary Linear Codes: Theory and Algorithms.

Michael Helmling, Stefan Ruzika, Akin Tanatmis

IEEE Trans. Inf. Theory, 2012

Generalized multiple objective bottleneck problems.

Jochen Gorski, Kathrin Klamroth, Stefan Ruzika

Oper. Res. Lett., 2012

Min-Max quickest path problems.

Stefan Ruzika, Markus Thiemann

Networks, 2012

Committee selection under weight constraints.

Christian Klamler, Ulrich Pferschy, Stefan Ruzika

Math. Soc. Sci., 2012

ML vs. BP decoding of binary and non-binary LDPC codes.

Stefan Scholl, Frank Kienle, Michael Helmling, Stefan Ruzika

Proceedings of the 7th International Symposium on Turbo Codes and Iterative Information Processing, 2012

2011

Evacuation dynamics influenced by spreading hazardous material.

Simone Göttlich, Sebastian Kühn, Jan Peter Ohst, Stefan Ruzika, Markus Thiemann

Networks Heterog. Media, 2011

Earliest arrival flows on series-parallel graphs.

Stefan Ruzika, Heike Sperber, Mechthild Steiner

Networks, 2011

Connectedness of Efficient Solutions in Multiple Objective Combinatorial Optimization.

Jochen Gorski, Kathrin Klamroth, Stefan Ruzika

J. Optim. Theory Appl., 2011

Mathematical Programming Decoding of Binary Linear Codes: Theory and Algorithm

Michael Helmling, Stefan Ruzika, Akin Tanatmis

CoRR, 2011

Reliable and Restricted Quickest Path Problems.

Stefan Ruzika, Markus Thiemann

Proceedings of the Network Optimization - 5th International Conference, 2011

Quickest Cluster Flow Problems on Tree Networks.

Kathrin Leiner, Stefan Ruzika

Proceedings of the Network Optimization - 5th International Conference, 2011

2010

A separation algorithm for improved LP-decoding of linear block codes.

Akin Tanatmis, Stefan Ruzika, Horst W. Hamacher, Mayur Punekar, Frank Kienle, Norbert Wehn

IEEE Trans. Inf. Theory, 2010

Numerical Comparison of IP Formulations as ML Decoders.

Akin Tanatmis, Stefan Ruzika, Mayur Punekar, Frank Kienle

Proceedings of IEEE International Conference on Communications, 2010

2009

On k-max-optimization.

Jochen Gorski, Stefan Ruzika

Oper. Res. Lett., 2009

Valid inequalities for binary linear codes.

Stefan Ruzika, Akin Tanatmis, Frank Kienle, Horst W. Hamacher, Norbert Wehn, Mayur Punekar

Proceedings of the IEEE International Symposium on Information Theory, 2009

A Survey on Multiple Objective Minimum Spanning Tree Problems.

Stefan Ruzika, Horst W. Hamacher

Proceedings of the Algorithmics of Large and Complex Networks - Design, 2009

Committee Selection with a Weight Constraint Based on Lexicographic Rankings of Individuals.

Christian Klamler, Ulrich Pferschy, Stefan Ruzika

Proceedings of the Algorithmic Decision Theory, First International Conference, 2009

2007

Finding representative systems for discrete bicriterion optimization problems.

Horst W. Hamacher, Christian Roed Pedersen, Stefan Ruzika

Oper. Res. Lett., 2007

Multiple objective minimum cost flow problems: A review.

Horst W. Hamacher, Christian Roed Pedersen, Stefan Ruzika

Eur. J. Oper. Res., 2007

2006

An Exact Algorithm for Solving Weight-Constrained Combinatorial Optimization Problems.

Stefan Ruzika

Electron. Notes Discret. Math., 2006

Algorithms for time-dependent bicriteria shortest path problems.

Horst W. Hamacher, Stefan Ruzika, Stevanus A. Tjandra

Discret. Optim., 2006