Dr. Stephan Bütikofer

Persönliches Profil

Tätigkeit an der ZHAW

- Lecturer of Operations Management and Mathematics
- Senior research scientist

Arbeits- und Forschungsschwerpunkte, Spezialkenntnisse

Continuous Optimization, theory and methods

In particular:
Nonsmooth analysis and methods applied to optimization, variational and equilibrium problems (including local and global convergence analysis of Newton-type and penalty methods, computer implementation and testing of algorithms).

Aus- und Fortbildung

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

Beruflicher Werdegang

Referee’s report for:
SIAM Journal on Optimization, Numerische Mathematik, Optimization, Operations Research Proceedings 2010

Lecturer at the University of Applied Sciences Switzerland for Distance Studies (since 2008)

Assistant lecturer at the University of Zurich (since 2009)

Mitglied in Netzwerken

Swiss Operations Research Society

Projekte

• 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; 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

• 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, Raimond Matthias; Ess, Severin,

  2019.

  Periodic timetabling with flexibility based on a mesoscopic topology.

  In:

  OR2019, Annual International Conference of the German Operations Research Society, Dresden, Germany, 3-4 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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