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. et al. (2019) 'Maintenance timetable planning based on mesoscopic infrastructure and the transport service intention', Journal of Rail Transport Planning & Management, 11, p. 100146. doi: 10.1016/j.jrtpm.2019.100146.
• Wüst, R. M. et al. (2015) 'Generation of interactive questionnaires using YAWL-based workflow models', Management Studies, 3(11-12), pp. 273–280. doi: 10.17265/2328-2185/2015.1112.002.
• Bütikofer, S., Klatte, D. and Kummer, B. (2010) 'On second-order Taylor expansion of critical values', Kybernetika, 46(3), pp. 472–487. Available at: http://www.kybernetika.cz/content/2010/3/472/paper.pdf.
• Bütikofer, S. and 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), pp. 2381–2412. doi: 10.1137/090751025.
• Bütikofer, S. (2008) 'Globalizing a nonsmooth Newton method via nonmonotone path search', Mathematical Methods of Operations Research, 68(2), pp. 235–256. doi: 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. doi: 10.3929/ethz-a-005774093.

Written conference contributions, peer-reviewed

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

Other publications

• Bütikofer, S. et al. (2023) 'Steigerung der ÖV-Attraktivität durch Optimierung der Anschlusse von Bus zu Bahn', ETR – Eisenbahntechnische Rundschau, 2023(11), pp. 74–77.
• Bütikofer, S. et al. (2019) 'Automatisierte Linienplanung im öffentlichen Verkehr', ETR – Eisenbahntechnische Rundschau, 19(4), pp. 68–72. doi: 10.21256/zhaw-17897.
• Wüst, R. et al. (2018) Development of a prototype for the automated generation of timetable scenarios specified by the transport service intention. St. Gallen: SBB Forschungsfonds HSG. doi: 10.21256/zhaw-18564.
• Schmelzer, H. et al. (2017) Kooperationsplattform für die urbane Güterlogistik : Schlussbericht.
• Schmelzer, H., Bütikofer, S. and 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), pp. 16–19. doi: 10.21256/zhaw-3864.
• Heitz, C., Bütikofer, S. and Dettling, M. (2014) 'Customers as investment objects : a new perspective on marketing', in Conference proceedings of the 13th international science-to-business marketing conference on cross organizational value creation. Münster: Fachhochschule Münster, pp. 257–271. doi: 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. and Wüst, R. M. (2023) 'Modelling approaches for travel chains of customers (in LinTim)', in Hot Topic Workshop: Integrated Planning in Public Transport, Münchweiler, Germany, 6-8 March 2023.
• Bütikofer, S., Wüst, R. M. and Zumkehr, M. (2022) 'A service intention in public transport with integrated travel chains : generation and benefits', in 18th Swiss Operations Research Days (Swiss OR Days 2022), Winterthur, Switzerland, 2-3 June 2022.
• Bütikofer, S. and Wüst, R. M. (2022) 'Erweiterungsmassnahmen für LinTim-Einsätze in «Multi-Linetype»-Umgebungen', in Workshop der DFG-Forschungsgruppe 2083, Industrietag LinTim, Karlsruhe, Deutschland, 22. September 2022.
• Bütikofer, S., Wüst, R. M. and Zumkehr, M. (2022) 'Automatic generation of a service intention in public transport with integrated travel chains', in Annual conference of the Operations Research Society of Germany (GOR e.V.) (OR2022), Karlsruhe, Germany, 6-9 September 2022. Available at: https://www.or2022.de/.
• Bütikofer, S. et al. (2022) 'Efficient timetable stability analysis using a graph contraction procedure', in Fifth International Conference on Railway Technology: Research, Development and Maintenance, Montpellier, France, 22-25 August 2022.
• Bütikofer, S., Wüst, R. M. and Ess, S. (2019) 'Periodic timetabling with flexibility based on a mesoscopic topology', in Annual International Conference of the German Operations Research Society (GOR), Dresden, Germany, 4-6 September 2019.
• Wüst, R. M. et al. (2019) 'Improvement of maintenance timetable stability based on iteratively assigning event flexibility in FPESP', in 8th International Conference on Railway Operations Modelling and Analysis (ICROMA), Norrköping, Sweden, 17-20 June 2019.
• Wüst, R. M. et al. (2018) 'Periodic timetabling with 'Track Choice'-PESP based on given line concepts and mesoscopic infrastructure', in OR2018, Operations Research Conference, Brussels, Belgium, 12-14 September 2018. Available at: https://www.euro-online.org/conf/admin/tmp/program-or2018.pdf.
• Bütikofer, S., Wüst, R. M. and Steiner, A. (2018) 'Periodic timetabling with 'Track Choice'-PESP based on given line concepts and mesoscopic infrastructure', in EULOG 2018: Entscheidungsunterstützung in der Logistik, Linz, Österreich, 4.-5. Oktober 2018.
• Bütikofer, S. and Hofer, C. (2018) 'Development of a consistent approach for inventory control of Unit Load Devices (ULD) in international air transportation', in OR2018, Operations Research Conference, Brussels, Belgium, 12-14 September 2018.
• Bütikofer, S. and Klatte, D. (2008) 'A globalized nonsmooth Newton Method, applications and numerical results', in OR2008, Operations Research Conference, Augusburg, Germany, 3-5 September 2008.
• Bütikofer, S. (2007) 'Globalizing a nonsmooth Newton method via path search', in 13th Czech-French-German Conference on Optimization (CFG), Heidelberg, 17-21 September 2007.
• Bütikofer, S. (2007) 'Globalizing a nonsmooth Newton method via path search', in Fifth Joint Operations Research Days, Zurich, 27-28 August 2007.
• Klatte, D. and Bütikofer, S. (2007) 'Globalizing a nonsmooth Newton method via path search', in International Conference on Continuous Optimization (ICCOPT), Hamilton, Canada, 13-16 August 2007.
• Bütikofer, S. (2006) 'A global Newton method for nonsmooth Lipschitz equations', in EURO Summer Institute «Optimization Challenges in Engineering: Methods, Software and Applications», Wittenberg, 18 August - 2 September 2006.

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