Transportation Science

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Vehicle Routing with Stochastic Demands: Properties and Solution Frameworks
Transportation Science - Tập 23 Số 3 - Trang 166-176 - 1989
Moshe Dror, Gilbert Laporte, Pierre Trudeau
This paper considers the vehicle routing problem with stochastic demands. The objective is to provide an overview of this problem, and to examine a variety of solution methodologies. The concepts and the main issues are reviewed along with some properties of optimal solutions. The existing stochastic mathematical programming formulations are presented and compared and a new formulation is...... hiện toàn bộ
An Adaptive Dynamic Programming Algorithm for Dynamic Fleet Management, II: Multiperiod Travel Times
Transportation Science - Tập 36 Số 1 - Trang 40-54 - 2002
Gregory A. Godfrey, Warren B. Powell
In a companion paper (Godfrey and Powell 2002) we introduced an adaptive dynamic programming algorithm for stochastic dynamic resource allocation problems, which arise in the context of logistics and distribution, fleet management, and other allocation problems. The method depends on estimating separable nonlinear approximations of value functions, using a dynamic programming framework. T...... hiện toàn bộ
Continuous Facility Location with Backbone Network Costs
Transportation Science - Tập 49 Số 3 - Trang 433-451 - 2015
John Gunnar Carlsson, Jiadong Fan
We consider a continuous facility location problem in which our objective is to minimize the weighted sum of three costs: (1) fixed costs from installing the facilities, (2) backbone network costs incurred from connecting the facilities to each other, and (3) transportation costs incurred from providing services from the facilities to the service region. We first analyze the limiting beha...... hiện toàn bộ
A Maximum Expected Covering Location Model: Formulation, Properties and Heuristic Solution
Transportation Science - Tập 17 Số 1 - Trang 48-70 - 1983
Mark S. Daskin
The maximum covering location model has been used extensively in analyzing locations for public service facilities. The model is extended to account for the chance that when a demand arrives at the system it will not be covered since all facilities capable of covering the demand are engaged serving other demands. An integer programming formulation of the new problem is presented. Several ...... hiện toàn bộ
The Maximal Expected Covering Location Problem: Revisited
Transportation Science - Tập 23 Số 4 - Trang 277-287 - 1989
Rajan Batta, June M. Dolan, Nirup Krishnamurthy
The Maximal Expected Coverage Location Problem (MEXCLP) addresses the problem of optimally locating servers so as to maximize the expected coverage of demand while taking into account the possibility of servers being unavailable when a call enters the service system. In this paper, an attempt is made to relax three of MEXCLP's assumptions: servers operate independently, servers have the s...... hiện toàn bộ
A Study of Demand Stochasticity in Service Network Design
Transportation Science - Tập 43 Số 2 - Trang 144-157 - 2009
Arnt-Gunnar Lium, Teodor Gabriel Crainic, Stein W. Wallace
The objective of this paper is to investigate the importance of introducing stochastic elements into service network design formulations. To offer insights into this issue, we take a basic version of the problem in which periodic schedules are built for a number of vehicles and where only the demand may vary stochastically. We study how solutions based on uncertain demand differ from solu...... hiện toàn bộ
A Probabilistic Traffic-Theoretic Network Loading Model Suitable for Large-Scale Network Analysis
Transportation Science - Tập 52 Số 6 - Trang 1509-1530 - 2018
Jing Lü, Carolina Osorio
This paper formulates an analytical stochastic network loading model. It is a stochastic formulation of the link transmission model (LTM), which itself is an operational formulation of Newell’s simplified theory of kinematic waves. The proposed model builds on an existing initial model. It proposes a formulation with enhanced scalability. In particular, compared with the initial model, it...... hiện toàn bộ
Application of Kalman Filtering to the Surveillance and Control of Traffic Systems
Transportation Science - Tập 6 Số 4 - Trang 419-439 - 1972
Michael W. Szeto, Denos C. Gazis
The methodology of the discrete-time, extended Kalman filter is applied for the estimation of densities and the control of critical traffic links. The methodology is tested using traffic data obtained at the Lincoln tunnel of New York City. Two algorithms are tested, one involving density estimation alone and one combining density estimation with a formalism for the determination of optim...... hiện toàn bộ
Capturing Dependency Among Link Boundaries in a Stochastic Dynamic Network Loading Model
Transportation Science - Tập 49 Số 2 - Trang 420-431 - 2015
Carolina Osorio, Gunnar Flötteröd
This work adds realistic dependency structure to a previously developed analytical stochastic network loading model. The model is a stochastic formulation of the link-transmission model, which is an operational instance of Newell’s simplified theory of kinematic waves. Stochasticity is captured in the source terms, the flows, and, consequently, in the cumulative flows. The previous approa...... hiện toàn bộ
A Hierarchical Objective Set Covering Model for Emergency Medical Service Vehicle Deployment
Transportation Science - Tập 15 Số 2 - Trang 137-152 - 1981
Mark S. Daskin, Edmund H. Stern
The use of hierarchical and multiobjective programming in public decision making is reviewed. The conventional set covering (CSC) problem is formulated for locating emergency medical service (EMS) vehicles. Its computational and practical limitations are discussed. The desire to account for inter-district responses leads to the formulation of a hierarchical objective set covering (HOSC) p...... hiện toàn bộ
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