Emanuela Guerriero

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Given a graph whose arc traversal times vary over time, the Time-Dependent Travelling Salesman Problem (TDTSP) consists in finding a Hamiltonian tour of least total duration covering the vertices of the graph. The contribution of this paper is twofold. First, we describe a lower and upper bounding procedure that requires the solution of a simpler (yet(More)
This paper addresses a particular stochastic lot-sizing and scheduling problem. The evolution of the uncertain parameters is modelled by means of a scenario tree and the resulting model is a multistage stochastic mixed-integer program. We develop a heuristic approach that exploits the specific structure of the problem. The computational experiments carried(More)
This article introduces the Pickup and Delivery Problem under Track Contention, a particular vehicle routing problem in which loads have to be transported between origin–destination pairs by means of vehicles travelling along a capacitated network. Two sequential heuristics and a parallel tabu search are proposed. Computational experiments show that the(More)
Discrete event simulation based on the object oriented approach is an interesting research area mainly composed by two research topics: the design of object oriented simulation language and the definition of methodologies that starting from a conceptual modeling phase guides the simulation designer to develop an object oriented simulator. The two subjects(More)
Urban waste management is becoming an increasingly complex task, absorbing a huge amount of resources, and having a major environmental impact. The design of a waste management system consists in various activities, and one of these is related to the definition of shift schedules for both personnel and vehicles. This activity has a great incidence on the(More)