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Displaying 61 –
80 of
1557
This paper is concerned with the study of a model case of first order Hamilton-Jacobi equations posed on a “junction”, that is to say the union of a finite number of half-lines with a unique common point. The main result is a comparison principle. We also prove existence and stability of solutions. The two challenging difficulties are the singular geometry of the domain and the discontinuity of the Hamiltonian. As far as discontinuous Hamiltonians are concerned, these results seem to be new. They...
This paper presents a heuristic column generation
method for solving vehicle routing problems with
a heterogeneous fleet of vehicles. The method may
also solve the fleet size and composition vehicle
routing problem and new best known solutions are
reported for a set of classical problems.
Numerical results show that the method is robust
and efficient, particularly for medium and large
size problem instances.
In this paper, we consider a regulation problem of an urban transportation network. From a given timetable, we aim to find a new schedule of multiple vehicles after the detection of a disturbance at a given time. The main objective is to find a solution maximizing the level of service for all passengers. This problem was intensively studied with evolutionary approaches and multi-agent techniques, but without identifying its type before. In this paper, we formulate the problem as a classical one...
This paper addresses a Three-Dimensional Loading Capacitated Vehicle Routing Problem
(3L-CVRP) which combines a three-dimensional loading problem and vehicle routing problem
in distribution logistics. The problem requires the combinatorial optimization of a
feasible loading solution and a successive routing of vehicles to satisfy client demands,
where all vehicles must start and terminate at a central depot. In spite of its clear
practical significance...
This paper addresses a Three-Dimensional Loading Capacitated Vehicle Routing Problem
(3L-CVRP) which combines a three-dimensional loading problem and vehicle routing problem
in distribution logistics. The problem requires the combinatorial optimization of a
feasible loading solution and a successive routing of vehicles to satisfy client demands,
where all vehicles must start and terminate at a central depot. In spite of its clear
practical significance...
Many of today’s systems are characterized by a network structure and evaluation of alternatives is based on multiple criteria. Network systems contain both positive and negative feedbacks. In the paper, a hybrid procedure is proposed for operation in network environment. The procedure is based on a combination of DEMATEL, ANP, and PROMETHEE approaches. DEMATEL is a comprehensive method for building and analyzing a structural model involving causal relationships between complex factors. For the network...
We consider the steady-state behavior of random walks in the quarter-plane, in particular, the expected value of performance measures that are component-wise linear over the state space. Since the stationary distribution of a random walk is in general not readily available we establish upper and lower bounds on performance in terms of another random walk with perturbed transition probabilities, for which the stationary distribution is a geometric product-form. The Markov reward approach as developed...
The paper introduces a new method of reaching a consensus in multiple criteria group decision-making under fuzziness. This model is based on the general definition of the ‘soft’ consensus introduced by Kacprzyk and Fedrizzi in 1986. The fuzzy evaluations of alternatives express degrees of fulfillment of the given goals by the respective alternatives for each expert. The selection of the best alternative is based on the fuzzy consensus by experts. For this purpose a set of alternatives which are...
We consider a stochastic approach in order to define an equilibrium model for a traffic-network problem. In particular, we assume a markovian behaviour of the users in their movements throughout the zones of the traffic area. This assumption turns out to be effective at least in the context of urban traffic, where, in general, the users tend to travel by choosing the path they find more convenient and not necessarily depending on the already travelled part. The developed model is a homogeneous Markov...
We consider a stochastic approach in order to define an
equilibrium model for a traffic-network problem.
In particular, we assume a Markovian behaviour of the users in their
movements throughout the zones of the traffic area. This assumption turns out
to be
effective at least in the context of urban traffic, where, in general, the users tend to
travel by choosing the path they find more convenient and not necessarily depending on the
already travelled part.
The developed model is a homogeneous...
Currently displaying 61 –
80 of
1557