Blar i SINTEF Industri på forfatter "Wallace, Stein William"
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The combined impact of stochastic and correlated activity durations and design uncertainty on project plans
Kaut, Michal; Vaagen, Hajnalka; Wallace, Stein William (Peer reviewed; Journal article, 2020)Most model based studies on project uncertainty investigate a single source of uncertainty, with a dominant focus on stochastic activity durations. However, another major uncertainty facing engineering projects is that of ... -
On scenario construction for stochastic shortest path problems in real road networks
Zhang, Dongqing; Wallace, Stein William; Guo, Zhaoxia; Dong, Yucheng; Kaut, Michal (Peer reviewed; Journal article, 2021)Stochastic shortest path (SSP) computations are often performed under very strict time constraints, so computational efficiency is critical. A major determinant for the CPU time is the number of scenarios used. We demonstrate ... -
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 ...