Speaker:
Dr. Slawo Wesolkowski
Scientist, DRDC CORA
Adjunct Professor, University of Waterloo
Title:
Risk-Based Multiobjective Optimization for a Vehicle Fleet Mix Problem
Date:
Wednesday, November 4, 2009
Time:
11:30 am - 12:30 pm
Location:
EIT 3142
Abstract:
Organizations transporting people and cargo are concerned about
determining how many vehicles they need to accomplish required
transportation tasks. Those approaches usually involve using Discrete
Event Simulation (DES). However, integrating DES in a framework to
determine an optimal fleet is impossible due to the high computational
cost of DEVS and the very large combinatorial space of possible
fleets. Therefore, a surrogate or approximate model for DES needs to
be devised. In this talk, the Stochastic Fleet Estimation (SaFE) model
is presented, a very simple Monte Carlo-based model, which generates a
vehicle fleet based on the average set of required tasks that the fleet
is supposed to accomplish (the average fleet). This model is then used
within a multiobjective optimization framework (using NSGA II as the
optimizer) in order to determine optimal fleets with respect to different
objectives. The optimization searches for Pareto-optimal combinations
of valid platform-assignments for a list of tasks, which can be applied
to entire scenarios output by SaFE. The following three objectives are
used: performance, cost and risk. Variance information associated with
the average platform numbers generated by SaFE is used to determine
the cost of the fleet needed to accomplish 95% of future scenarios (the
maximum fleet). The risk objective is based on the difference between
the maximum fleet and the average fleet. Qualitative optimal solution
fleets based on three objectives are discussed.
Biography:
Slawo Wesolkowski is a Scientist at DRDC CORA. He has previously
worked for Vantage Point International (now C-CORE), NCR Canada Ltd.,
Nortel, Moteurs Leroy-Somer (France), the University of Waterloo,
and the National Research Council of Canada. He holds five US patents,
and one Canadian/EU patent. He obtained BASc, MASc and PhD degrees in
Systems Design Engineering from the University of Waterloo, Canada. He
is currently Vice President Members Activities of the IEEE Computational
Intelligence Society. He was the General Chair of the 2009 IEEE Symposium
on Computational Intelligence for Security and Defense Applications
(IEEE CISDA).
Invited by:
Prof.
F. Karray
Co-sponsored by KW Chapters of the IEEE Computational Intelligence Society,
IEEE Control Systems Society, and the IEEE Systems, Man and Cybernetics Society
