Dr. Stephan Bütikofer

Projects

• Advancing 15-Minute Cities through Collaborative and Smart Urban Solutions / Deputy project leader / ongoing
• Intelligent Framework for Inclusive and Seamless Transport Infrastructure and Mobility Services / Team member / ongoing
• Optimal annual and daily timetables in SBB traffic management / Deputy project leader / ongoing
• Smart UMH: Smart urban multihub concept: Sustainable and liveable cities with low logistics visibility / Team member / ongoing
• Customer orientation in the Traffic Management System / Deputy project leader / completed
• SBB-Research Funds 'Automated Timetable Planning' / Co-project leader / completed
• Flight Network Simulation at Swiss International Air Lines / Project leader / completed
• Rail Transport Service Environment / Team member / completed
• Energy Optimization for Vessel Operations / Team member / completed
• Cooperational platform for urban logictis: An economically and ecologically efficient business model for the city of Zürich and other agglomerations / Team member / completed
• Development of a consistent approach for stock planning and allocation of Unit Load Devices (ULD) in international air transportation. / Project leader / completed
• Set up your ERP with a questionnaire and without manual / Team member / completed
• Planning and Optimization of marketing campaigns under dyanamical customer behavior / Team member / completed

Publications

Articles in scientific journal, peer-reviewed

• Wüst, R. M., Bütikofer, S., Ess, S., Gomez, C., Steiner, A., Laumanns, M., & Szabo, J. (2019). Maintenance timetable planning based on mesoscopic infrastructure and the transport service intention. Journal of Rail Transport Planning & Management, 11, 100146. https://doi.org/10.1016/j.jrtpm.2019.100146
• Wüst, R. M., Bütikofer, S., Spielberger, J., & Sigrist, J. (2015). Generation of interactive questionnaires using YAWL-based workflow models. Management Studies, 3(11-12), 273–280. https://doi.org/10.17265/2328-2185/2015.1112.002
• Bütikofer, S., Klatte, D., & Kummer, B. (2010). On second-order Taylor expansion of critical values. Kybernetika, 46(3), 472–487. http://www.kybernetika.cz/content/2010/3/472/paper.pdf
• Bütikofer, S., & Klatte, D. (2010). A nonsmooth Newton method with path search and its use in solving $C^{1,1}$ programs and semi-infinite problems. SIAM Journal on Optimization, 20(5), 2381–2412. https://doi.org/10.1137/090751025
• Bütikofer, S. (2008). Globalizing a nonsmooth Newton method via nonmonotone path search. Mathematical Methods of Operations Research, 68(2), 235–256. https://doi.org/10.1007/s00186-008-0219-8

Books, peer-reviewed

Bütikofer, S. (2008). Generalized Newton type methods for nonsmooth equations in optimization and complementarity problems [Doctoral dissertation, ETH Zurich]. https://doi.org/10.3929/ethz-a-005774093

Written conference contributions, peer-reviewed

• Muratori, C., De Martinis, V., & Bütikofer, S. (2025). Exploring demand-responsive transport suitability in rural Switzerland : a simulation approach for the Canton of Thurgau [Conference paper]. Transportation Research Procedia, 91, 544–551. https://doi.org/10.1016/j.trpro.2025.10.070
• Bütikofer, S., Wuest, R., & Zumkehr, M. (2025). Optimizing connections times in timetabling by using travel chain information (G. Voigt, M. Fliedner, K. Haase, W. Brüggemann, K. Hoberg, & J. Meissner, Eds.; pp. 177–183) [Conference paper]. Springer. https://doi.org/10.1007/978-3-031-58405-3_23
• Bütikofer, S., Fontana, D., Steiner, A., & Wüst, R. (2022, August 22). Efficient timetable stability analysis using a graph contraction procedure. Fifth International Conference on Railway Technology: Research, Development and Maintenance, Montpellier, France, 22-25 August 2022. https://doi.org/10.21256/zhaw-27165
• Gioia, S., Bütikofer, S., & Wüst, R. M. (2022). Generating timetables for a multi-linetype public transport offer based on a service intention including travel chains of customers [Conference paper]. 22nd Swiss Transport Research Conference (STRC), Ascona, Switzerland, 18-20 May 2022, 18. https://www.strc.ch/2022/Gioia_EtAl.pdf
• Gioia, S., De Martinis, V., Bütikofer, S., & Wüst, R. M. (2021). Evaluation of the delay management potential on a macroscopic level [Conference paper]. In R. W. de Doncker, N. Nießen, N. Friesen, & C. Schindler (Eds.), IRSA 2021 : Tagungsband (pp. 165–180). RWTH Aachen University. https://doi.org/10.18154/RWTH-2022-01700
• Bütikofer, S., Steiner, A., & Wüst, R. (2020). Periodic timetabling with flexibility based on a mesoscopic topology [Conference paper]. Operations Research Proceedings 2019, 789–795. https://doi.org/10.1007/978-3-030-48439-2_96
• Wüst, R. M., Bütikofer, S., Köchli, J., & Ess, S. (2019). Generation of the transport service offer with application to timetable planning considering constraints due to maintenance work [Conference paper]. Proceedings of the 2nd International Railway Symposium Aachen 2019, 226–244. https://doi.org/10.18154/RWTH-2019-11969
• Wüst, R., Bütikofer, S., Ess, S., Gomez, C., Steiner, A., Laumanns, M., & Szabo, J. (2019). Improvement of maintenance timetable stability based on iteratively assigning event flexibility in FPESP [Conference paper]. In A. Peterson, M. Joborn, & M. Bohlin (Eds.), RailNorrköping 2019 (pp. 1140–1157). Linköping University Electronic Press. https://doi.org/10.21256/zhaw-18282
• Wüst, R., Bütikofer, S., Ess, S., Gomez, C., Steiner, A., Laumanns, M., & Szabo, J. (2019). Periodic timetabling with ‘Track Choice’-PESP based on given line concepts and mesoscopic infrastructure [Conference paper]. Operations Research Proceedings 2018, 571–578. https://doi.org/10.1007/978-3-030-18500-8_71
• Bütikofer, S., & Steiner, A. (2016). Extension and application of a general pickup and delivery model for evaluating the impact of bundling goods in an urban environment [Conference paper]. Operations Research Proceedings 2014, 83–89. https://doi.org/10.1007/978-3-319-28697-6_13

Other publications

• Bütikofer, S., De Martinis, V., Gomez, C., & Steiner, A. (2023). Steigerung der ÖV-Attraktivität durch Optimierung der Anschlusse von Bus zu Bahn. ETR – Eisenbahntechnische Rundschau, 2023(11), 74–77.
• Bütikofer, S., Köchli, J., Frick, K., & Weber, C. (2019). Automatisierte Linienplanung im öffentlichen Verkehr. ETR – Eisenbahntechnische Rundschau, 19(4), 68–72. https://doi.org/10.21256/zhaw-17897
• Wüst, R., Gomez, C., Ess, S., Steiner, A., & Bütikofer, S. (2018). Development of a prototype for the automated generation of timetable scenarios specified by the transport service intention. SBB Forschungsfonds HSG. https://doi.org/10.21256/zhaw-18564
• Schmelzer, H., Hollenstein, L., Bütikofer, S., Steiner, A., Wüst, R. M., & Zuberbühler, I. (2017). Kooperationsplattform für die urbane Güterlogistik : Schlussbericht.
• Schmelzer, H., Bütikofer, S., & Hollenstein, L. (2016). Kooperieren? Ja! Aber wie? : Chancen und Herausforderungen bei der Entwicklung einer Kooperationsplattform für urbane Güterlogistik in der Stadt Zürich. Logistics Innovation, 2016(1), 16–19. https://doi.org/10.21256/zhaw-3864
• Heitz, C., Bütikofer, S., & Dettling, M. (2014). Customers as investment objects : a new perspective on marketing [Conference paper]. Conference Proceedings of the 13th International Science-to-Business Marketing Conference on Cross Organizational Value Creation, 257–271. https://doi.org/10.21256/zhaw-1888
• Bütikofer, S. (2008). Globalizing a nonsmooth Newton method via path search, invited presentation at ETH Zurich: Optimization and Applications Seminar, Zurich, 17 November 2008.
• Bütikofer, S. (2008). Globalizing a nonsmooth Newton method via path search, invited presentation at University of Graz : SFB Colloquium, Graz, 9 April 2008.

Oral conference contributions and abstracts

• Bütikofer, S., & Wüst, R. M. (2023, March 6). Modelling approaches for travel chains of customers (in LinTim). Hot Topic Workshop: Integrated Planning in Public Transport, Münchweiler, Germany, 6-8 March 2023.
• Bütikofer, S., Wüst, R. M., & Zumkehr, M. (2022). A service intention in public transport with integrated travel chains : generation and benefits. 18th Swiss Operations Research Days (Swiss OR Days 2022), Winterthur, Switzerland, 2-3 June 2022.
• Bütikofer, S., & Wüst, R. M. (2022, September 22). Erweiterungsmassnahmen für LinTim-Einsätze in «Multi-Linetype»-Umgebungen. Workshop der DFG-Forschungsgruppe 2083, Industrietag LinTim, Karlsruhe, Deutschland, 22. September 2022.
• Bütikofer, S., Wüst, R. M., & Zumkehr, M. (2022, September 8). Automatic generation of a service intention in public transport with integrated travel chains. Annual Conference of the Operations Research Society of Germany (GOR E.V.) (OR2022), Karlsruhe, Germany, 6-9 September 2022. https://www.or2022.de/
• Bütikofer, S., Wüst, R. M., Steiner, A., & Fontana, D. (2022, August 22). Efficient timetable stability analysis using a graph contraction procedure. Fifth International Conference on Railway Technology: Research, Development and Maintenance, Montpellier, France, 22-25 August 2022.
• Bütikofer, S., Wüst, R. M., & Ess, S. (2019, September 5). Periodic timetabling with flexibility based on a mesoscopic topology. Annual International Conference of the German Operations Research Society (GOR), Dresden, Germany, 4-6 September 2019.
• Wüst, R. M., Bütikofer, S., Ess, S., Gomez, C., Steiner, A., Laumanns, M., & Szabo, J. (2019, June). Improvement of maintenance timetable stability based on iteratively assigning event flexibility in FPESP. 8th International Conference on Railway Operations Modelling and Analysis (ICROMA), Norrköping, Sweden, 17-20 June 2019.
• Wüst, R. M., Gomez, C., Ess, S., Steiner, A., Bütikofer, S., Laumanns, M., & Szabo, J. (2018). Periodic timetabling with ‘Track Choice’-PESP based on given line concepts and mesoscopic infrastructure. OR2018, Operations Research Conference, Brussels, Belgium, 12-14 September 2018. https://www.euro-online.org/conf/admin/tmp/program-or2018.pdf
• Bütikofer, S., Wüst, R. M., & Steiner, A. (2018, October 4). Periodic timetabling with ‘Track Choice’-PESP based on given line concepts and mesoscopic infrastructure. EULOG 2018: Entscheidungsunterstützung in der Logistik, Linz, Österreich, 4.-5. Oktober 2018.
• Bütikofer, S., & Hofer, C. (2018, September 12). Development of a consistent approach for inventory control of Unit Load Devices (ULD) in international air transportation. OR2018, Operations Research Conference, Brussels, Belgium, 12-14 September 2018.
• Bütikofer, S., & Klatte, D. (2008, September 4). A globalized nonsmooth Newton Method, applications and numerical results. OR2008, Operations Research Conference, Augusburg, Germany, 3-5 September 2008.
• Bütikofer, S. (2007, September 18). Globalizing a nonsmooth Newton method via path search. 13th Czech-French-German Conference on Optimization (CFG), Heidelberg, 17-21 September 2007.
• Bütikofer, S. (2007, August 28). Globalizing a nonsmooth Newton method via path search. Fifth Joint Operations Research Days, Zurich, 27-28 August 2007.
• Klatte, D., & Bütikofer, S. (2007, August 13). Globalizing a nonsmooth Newton method via path search. International Conference on Continuous Optimization (ICCOPT), Hamilton, Canada, 13-16 August 2007.
• Bütikofer, S. (2006, August 30). A global Newton method for nonsmooth Lipschitz equations. EURO Summer Institute «Optimization Challenges in Engineering: Methods, Software and Applications», Wittenberg, 18 August - 2 September 2006.

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