Dr. Stephan Bütikofer

Arbeit an der ZHAW

Tätigkeit an der ZHAW

- Lecturer of Operations Research, Operations Management, Transport Modelling and Mathematics
- Senior research scientist

www.zhaw.ch/de/engineering/institute-zentren/idp/schwerpunkte/operations-research-and-operations-management/

Aus- und Weiterbildung

Arbeits- und Forschungsschwerpunkte, Spezialkenntnisse

Application and implementation of OR methods in industrial projects. Including:
• Revenue management,
• Production planning and control,
• Inventory control,
• Vehicle Routing,
• Workforce Scheduling.
• Line Planning and Timetabling in Public Transport
• Extension of Public Transport with On Demand Services

Optimization theory and methods, convex and variational analysis. In particular nonsmooth analysis and methods applied to
• Optimization problems
• Variational and equilibrium problems
including local and global convergence analysis of Newton-type and penalty methods, computer implementation and testing of algorithms.

Beruflicher Werdegang

Referee’s reports for:
SIAM Journal on Optimization, Optimization Methods and Software, Optimization, Operations Research Proceedings, Transportation Research Part C, European Journal of Operational Research, Expert Systems With Applications

Lectureships:
Assistant lecturer at the University of Zurich (since 2009)
Assistant lecturer at the ETH Zurich (since 2018)

Aus- und Fortbildung

Dr. sc. ETH, Dissertation, Operations Research, ETH Zürich
Dipl. math., Studies in mathematics, University of Basel

Mitglied in Netzwerken

• Swiss Operations Research Society
• International Association of Railway Operations Research
• VeRoLog EURO Working Group on Vehicle Routing and Logistics Optimization
• Verein Netzwerk Logistik
• Mathematical Optimization Society (MOS)
• Digital Mobility Lab (ZHAW)

Projekte

• DML Schnittstelle Stadtbus Winterthur / ProjektleiterIn / Projekt laufend
• Smart UMH: Smart urban multihub concept: Sustainable and liveable cities with low logistics visibility / Teammitglied / Projekt laufend
• Kundenorientierung im Traffic Management System / Stellv. ProjektleiterIn / Projekt abgeschlossen
• SBB-Forschungsfonds 'Automatisierte Fahrplanplanung' / Co-ProjektleiterIn / Projekt abgeschlossen
• Flugnetzwerk-Simulation bei Swiss International Air Lines / ProjektleiterIn / Projekt abgeschlossen
• Rail Transport Service Environment (RTSE II) / Teammitglied / Projekt abgeschlossen
• Energy Optimization for Vessel Operations / Teammitglied / Projekt abgeschlossen
• Kooperationsplattform für die urbane Güterlogistik / Teammitglied / Projekt abgeschlossen
• Placebook – An Innovative Parking Space Spot Market / Teammitglied / Projekt abgeschlossen
• Entwicklung eines einheitlichen Ansatzes zur Lagersteuerung und Lagerkontrolle für Unit Load Devices (ULD) im internationalen Flugverkehr / ProjektleiterIn / Projekt abgeschlossen
• Verkehrsreduzierte City-Logistik durch optimale Sendungsbündelung auf der ersten/ letzten Meile / Teammitglied / Projekt abgeschlossen
• Set up your ERP with a questionnaire and without manual / Teammitglied / Projekt abgeschlossen
• Planung und Optimierung von Marketingkampagnen unter dynamischem Kundenverhalten / Teammitglied / Projekt abgeschlossen

Publikationen

• Wüst, Raimond Matthias; Bütikofer, Stephan; Ess, Severin; Gomez, Claudio; Steiner, Albert; Laumanns, Marco; Szabo, Jacint; et al.,

  2019.

  Maintenance timetable planning based on mesoscopic infrastructure and the transport service intention.

  Journal of Rail Transport Planning & Management.

  11, S. 100146.

  Verfügbar unter: https://doi.org/10.1016/j.jrtpm.2019.100146

• Wüst, Raimond Matthias; Bütikofer, Stephan; Spielberger, Jürgen; Sigrist, Jörg,

  2015.

  Generation of interactive questionnaires using YAWL-based workflow models.

  Management Studies.

  3(11-12), S. 273-280.

  Verfügbar unter: https://doi.org/10.17265/2328-2185/2015.1112.002

• Bütikofer, Stephan; Klatte, Diethard,

  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), S. 2381-2412.

  Verfügbar unter: https://doi.org/10.1137/090751025

• Bütikofer, Stephan; Klatte, Diethard; Kummer, Bernd,

  2010.

  On second-order Taylor expansion of critical values.

  Kybernetika.

  46(3), S. 472-487.

  Verfügbar unter: http://www.kybernetika.cz/content/2010/3/472/paper.pdf

• Bütikofer, Stephan,

  2008.

  Globalizing a nonsmooth Newton method via nonmonotone path search.

  Mathematical Methods of Operations Research.

  68(2), S. 235-256.

  Verfügbar unter: https://doi.org/10.1007/s00186-008-0219-8

• Bütikofer, Stephan,

  2008.

  Generalized Newton type methods for nonsmooth equations in optimization and complementarity problems.

  Zurich:

  ETH Zurich.

  Verfügbar unter: https://doi.org/10.3929/ethz-a-005774093

• Bütikofer, Stephan; Fontana, Dominik; Steiner, Albert; Wüst, Raimond,

  2022.

  Efficient timetable stability analysis using a graph contraction procedure [Paper].

  In:

  Fifth International Conference on Railway Technology: Research, Development and Maintenance, Montpellier, France, 22-25 August 2022.

  ZHAW Zürcher Hochschule für Angewandte Wissenschaften.

  Verfügbar unter: https://doi.org/10.21256/zhaw-27165

• Gioia, Stefano; Bütikofer, Stephan; Wüst, Reimond Matthias,

  2022.

  Generating timetables for a multi-linetype public transport offer based on a service intention including travel chains of customers [Paper].

  In:

  22nd Swiss Transport Research Conference (STRC), Ascona, Switzerland, 18-20 May 2022.

  Institute for Transport Planning and Systems, ETH Zurich.

  S. 18.

  Verfügbar unter: https://www.strc.ch/2022/Gioia_EtAl.pdf

• Gioia, Stefano; De Martinis, Valerio; Bütikofer, Stephan; Wüst, Reimond Matthias,

  2021.

  Evaluation of the delay management potential on a macroscopic level [Paper].

  In:

  de Doncker, Rik W.; Nießen, Nils; Friesen, Nadine; Schindler, Christian, Hrsg.,

  IRSA 2021 : Tagungsband.

  3rd International Railway Symposium Aachen (IRSA), Aachen, Germany, 21-23 November 2021.

  Aachen:

  RWTH Aachen University.

  S. 165-180.

  Verfügbar unter: https://doi.org/10.18154/RWTH-2022-01700

• Bütikofer, Stephan; Steiner, Albert; Wüst, Raimond,

  2020.

  Periodic timetabling with flexibility based on a mesoscopic topology [Paper].

  In:

  Operations Research Proceedings 2019.

  Annual International Conference of the German Operations Research Society (GOR), Dresden, Germany, 4-6 September 2019.

  Cham:

  Springer.

  S. 789-795.

  Operations Research Proceedings.

  Verfügbar unter: https://doi.org/10.1007/978-3-030-48439-2_96

• Wüst, Raimond Matthias; Bütikofer, Stephan; Köchli, Joël; Ess, Severin,

  2019.

  Generation of the transport service offer with application to timetable planning considering constraints due to maintenance work [Paper].

  In:

  Proceedings of the 2nd International Railway Symposium Aachen 2019.

  IRSA 2019 : 2nd International Railway Symposium, Aachen, Germany, 26-28 November 2019.

  Aachen:

  RWTH Aachen University.

  S. 226-244.

  Verfügbar unter: https://doi.org/10.18154/RWTH-2019-11969

• Wüst, Raimond; Bütikofer, Stephan; Ess, Severin; Gomez, Claudio; Steiner, Albert; Laumanns, Marco; Szabo, Jacint,

  2019.

  Improvement of maintenance timetable stability based on iteratively assigning event flexibility in FPESP [Paper].

  In:

  Peterson, Anders; Joborn, Martin; Bohlin, Markus, Hrsg.,

  RailNorrköping 2019.

  8th International Conference on Railway Operations Modelling and Analysis, Norrköping, Sweden, 17-20 June 2019.

  Linköping:

  Linköping University Electronic Press.

  S. 1140-1157.

  Linköping Electronic Conference Proceedings ; 69.

  Verfügbar unter: https://doi.org/10.21256/zhaw-18282

• Wüst, Raimond; Bütikofer, Stephan; Ess, Severin; Gomez, Claudio; Steiner, Albert; Laumanns, Marco; Szabo, Jacint,

  2019.

  Periodic timetabling with ‘Track Choice’-PESP based on given line concepts and mesoscopic infrastructure [Paper].

  In:

  Operations Research Proceedings 2018.

  OR2018, Operations Research Conference, Brussels, Belgium, 12-14 September 2018.

  Cham:

  Springer.

  S. 571-578.

  Operations Research Proceedings.

  Verfügbar unter: https://doi.org/10.1007/978-3-030-18500-8_71

• Bütikofer, Stephan; Steiner, Albert,

  2016.

  Extension and application of a general pickup and delivery model for evaluating the impact of bundling goods in an urban environment [Paper].

  In:

  Operations Research Proceedings 2014.

  Annual International Conference of the German Operations Research Society (GOR), Aachen, Germany, 2-5 September 2014.

  Cham:

  Springer.

  S. 83-89.

  Operations Research Proceedings.

  Verfügbar unter: https://doi.org/10.1007/978-3-319-28697-6_13

• Bütikofer, Stephan; Köchli, Joël; Frick, Kevin; Weber, Christoph,

  2019.

  Automatisierte Linienplanung im öffentlichen Verkehr.

  Eisenbahntechnische Rundschau.

  19(4), S. 68-72.

  Verfügbar unter: https://doi.org/10.21256/zhaw-17897

• Wüst, Raimond; Gomez, Claudio; Ess, Severin; Steiner, Albert; Bütikofer, Stephan,

  2018.

  Development of a prototype for the automated generation of timetable scenarios specified by the transport service intention.

  St. Gallen:

  SBB Forschungsfonds HSG.

  Verfügbar unter: https://doi.org/10.21256/zhaw-18564

• Schmelzer, Helene; Hollenstein, Lukas; Bütikofer, Stephan; Steiner, Albert; Wüst, Raimond Matthias; Zuberbühler, Ivo,

  2017.

  Kooperationsplattform für die urbane Güterlogistik : Schlussbericht.

• Schmelzer, Helene; Bütikofer, Stephan; Hollenstein, Lukas,

  2016.

  Kooperieren? Ja! Aber wie? : Chancen und Herausforderungen bei der Entwicklung einer Kooperationsplattform für urbane Güterlogistik in der Stadt Zürich.

  Logistics Innovation.

  2016(1), S. 16-19.

  Verfügbar unter: https://doi.org/10.21256/zhaw-3864

• Heitz, Christoph; Bütikofer, Stephan; Dettling, Marcel,

  2014.

  Customers as investment objects : a new perspective on marketing [Paper].

  In:

  Conference proceedings of the 13th international science-to-business marketing conference on cross organizational value creation.

  13th International Science-to-Business Marketing Conference: «Cross Organizational Value Creation», Winterthur, 2-4 June 2014.

  Münster:

  Fachhochschule Münster.

  S. 257-271.

  Verfügbar unter: https://doi.org/10.21256/zhaw-1888

• Bütikofer, Stephan,

  2008.

  Globalizing a nonsmooth Newton method via path search, invited presentation at ETH Zurich: Optimization and Applications Seminar, Zurich, 17 November 2008.

• Bütikofer, Stephan,

  2008.

  Globalizing a nonsmooth Newton method via path search, invited presentation at University of Graz : SFB Colloquium, Graz, 9 April 2008.

• Bütikofer, Stephan; Wüst, Reimond Matthias,

  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, Stephan; Wüst, Reimond Matthias,

  2022.

  Erweiterungsmassnahmen für LinTim-Einsätze in «Multi-Linetype»-Umgebungen.

  In:

  Workshop der DFG-Forschungsgruppe 2083, Industrietag LinTim, Karlsruhe, Deutschland, 22. September 2022.

• Bütikofer, Stephan; Wüst, Reimond Matthias; Zumkehr, Maria,

  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.

  Verfügbar unter: https://www.or2022.de/

• Bütikofer, Stephan; Wüst, Reimond Matthias; Steiner, Albert; Fontana, Dominik,

  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, Stephan; Wüst, Reimond Matthias; Zumkehr, Maria,

  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, Stephan; Wüst, Raimond Matthias; Ess, Severin,

  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, Raimond Matthias; Bütikofer, Stephan; Ess, Severin; Gomez, Claudio; Steiner, Albert; Laumanns, Marco; Szabo, Jacint,

  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.

• Bütikofer, Stephan; Wüst, Raimond Matthias; Steiner, Albert,

  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, Stephan; Hofer, Christoph,

  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.

• Wüst, Raimond Matthias; Gomez, Claudio; Ess, Severin; Steiner, Albert; Bütikofer, Stephan; Laumanns, Marco; Szabo, Jazint,

  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.

  Verfügbar unter: https://www.euro-online.org/conf/admin/tmp/program-or2018.pdf

• Bütikofer, Stephan; Klatte, Diethard,

  2008.

  A globalized nonsmooth Newton Method, applications and numerical results.

  In:

  OR2008, Operations Research Conference, Augusburg, Germany, 3-5 September 2008.

• Bütikofer, Stephan,

  2007.

  Globalizing a nonsmooth Newton method via path search.

  In:

  13th Czech-French-German Conference on Optimization (CFG), Heidelberg, 17-21 September 2007.

• Bütikofer, Stephan,

  2007.

  Globalizing a nonsmooth Newton method via path search.

  In:

  Fifth Joint Operations Research Days, Zurich, 27-28 August 2007.

• Klatte, Diethard; Bütikofer, Stephan,

  2007.

  Globalizing a nonsmooth Newton method via path search.

  In:

  International Conference on Continuous Optimization (ICCOPT), Hamilton, Canada, 13-16 August 2007.

• Bütikofer, Stephan,

  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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