Browsing NHH Brage by Author "Wallace, Stein William"
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Handling financial risks in crude oil imports: Taking into account crude oil prices as well as country and transportation risks
Wang, Shuang; Wallace, Stein William; Lu, Jing; Gu, Yewen (Journal article; Peer reviewed, 2019)Financial risks related to crude oil imports are certainly affected by crude oil price uncertainty. Our question is: How important is it to take also physical risks, such as the crude oil exporters’ political risks and ... -
Problem-driven scenario generation: an analytical approach for stochastic programs with tail risk measure
Fairbrother, Jamie; Turner, Amanda; Wallace, Stein William (Journal article; Peer reviewed, 2019)Scenario generation is the construction of a discrete random vector to represent parameters of uncertain values in a stochastic program. Most approaches to scenario generation are distribution-driven, that is, they attempt ... -
Understanding the marginal distributions and correlations of link travel speeds in road networks
Guo, Feng; Gu, Xin; Guo, Zhaoxia; Dong, Yucheng; Wallace, Stein William (Peer reviewed; Journal article, 2020)Link travel speeds in road networks are essential data for a variety of research problems in logistics, transportation, and traffic management. Real-world link travel speeds are stochastic, and highly dependent on speeds ... -
Vehicle Routing with Space- and Time-Correlated Stochastic Travel Times: Evaluating the Objective Function
Guo, Zhaoxia; Wallace, Stein William; Kaut, Michal (Peer reviewed; Journal article, 2019)We study how to model and handle correlated travel times in two-stage stochastic vehicle-routing problems. We allow these travel times to be correlated in time and space; that is, the travel time on one link in one period ...