AQFC2015

Bridging the Gap Between Real World Decision Making and Mathematics - Multiobjective Optimisation in Action, Network Equilibrium in Transport Road Networks: A Multi-objective Approach


                          Seminar


    Department of Systems Engineering and Engineering Management

            The Chinese University of Hong Kong


Title     :       Bridging the Gap Between Real World Decision Making and Mathematics -                                              Multiobjective Optimisation in Action

Speaker    : Prof. Matthias Ehrgott

Title     :      Network Equilibrium in Transport Road Networks: A Multi-objective Approach

Speaker    : Dr. Judith Wang

Date       : 26th July, Friday

Time       : 4:30 p.m. - 6:00 p.m.

Venue      : Room 513

                  William M.W. Mong Engineering Building

                  CUHK

 


Title:

Bridging the Gap Between Real World Decision Making and Mathematics - Multiobjective Optimisation in Action

Abstract:

I will present several studies that illustrate the power of multiobjective optimisation in supporting decision makers facing conflicting goals. These studies are drawn from the fields of transportation (airline operations), health (radiation therapy treatment), and manufacturing (composite materials). I will illustrate the widely differing mathematical methods used in these applications, but will emphasis the common benefits of the multiobjective optimisation approach: The improved understanding of the problem achieved through additional insight into the problem structure; the improved support for decision makers through the ability to properly account for trade-offs between conflicting goals; and last but not least, the considerable benefits that result in terms of quality of decisions and/or improved decision making processes.



Biography:

Matthias Ehrgott is Chair Professor in the Department of Management Science at Lancaster University. He obtained his Masters (1992) and PhD degrees (1997) from the Fepartment of Mathematics at University of Kaiserslautern, Germany. From 2000 to 2013 he worked as Lecturer, Senior Lecturer, Associate Professor, Professor and Head of Department at the Department of Engineering Science, The University of Auckland. His research area is Operations Research, where he specialises in multiobjective optimisation and its applications in real world decision making problems. He has published several books, book chapters and around 60 journal papers in this area.




Title:

Network Equilibrium in Transport Road Networks: A Multi-objective Approach

Abstract:

The last stage of a conventional four-stage transport planning model, traffic assignment, is essentially modelling the route choice behaviour of travellers and their interactions. Whether a traffic assignment model can realistically represent travel behaviour is, therefore, dependent on the behavioural assumptions behind the route choice model. There are basically two approaches in practice, following the principles of the two classic traffic assignment models in the literature, namely, the user equilibrium (UE) model and the stochastic user equilibrium (SUE) model. It is well known that the three most important criteria affecting route choice behaviour include: travel time, travel time reliability and monetary cost. While both UE and SUE models have considered one or more of these three objectives, the objectives are combined into a generalised cost or a utility function, such that the optimisation process becomes essentially single-objective. We believe that we can represent travel behaviour more realistically with a more general equilibrium model by applying a multi-objective approach. In this study, we propose a three-objective user equilibrium model, considering the above mentioned three most important factors influencing route choice behaviour in a road network.



Biography:

Dr. Judith Wang is currently Associate Professor in Transport Engineering - Resilient Transportation, based in the School of Civil Engineering and Institute for Transport Studies at University of Leeds in the UK. She received her MSc(Eng) in Transport Planning and Engineering from University of Leeds in 1993 and PhD from Hong Kong University of Science and Technology in 2004. Prior to moving to the UK, she had worked for the University of Auckland in New Zealand for more than eight years, as a Lecturer in the Department of Civil Engineering, a Research Fellow in the Energy Centre and a Senior Research Fellow in the Department of Engineering Science. She has had a 20-year career in transport planning, with considerable experience not only in academia, but also nine years of practical experience in the transport industry in Hong Kong as well as in New Zealand, specialising in modelling and planning of transport services and infrastructure. Her work experience in Hong Kong include operations planning of the Mass Transit Railway in Hong Kong and strategic planning for the new Hong Kong International Airport opened in 1998.





************************* ALL ARE WELCOME ************************







Host         : Prof. Janny Leung

Tel          : (852) 3943-8238

Email        : janny@se.cuhk.edu.hk

Enquiries    : Prof. Li Lingfei

               Department of Systems Engineering and Engineering Management

               CUHK

Website      : http://seminar.se.cuhk.edu.hk

Email        : seem5202@se.cuhk.edu.hk

Date: 
Friday, July 26, 2013 - 08:30 to 10:00