The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper studies a control strategy for reducing congestions in freeway systems by applying ramp metering as control measure. More specifically, the objective is to define a Model Predictive Control scheme to be applied on line, characterized by a finite-horizon optimal control problem with a mixed-integer linear form, in order to be efficiently solved with commercial solvers. In this optimal control...
The increasing importance of environmental and social issues in transportation imposes to focus more and more on strengthening and improving rail transportation. This is even truer for logistics nodes, such as seaports, which represent places where intermodality occurs. The present paper is devoted to model and plan the rail port cycle, at an aggregate level, with the goal of satisfying a given demand...
A set of optimal control strategies is determined in this paper for a class of inventory-production systems, in order to optimize the production process in presence of perturbations on the inventory level. The inventory-production system has to satisfy a time-varying external demand, which is assumed to be a piecewise constant function of time; the optimization involves both production speed and the...
The paper is aimed at the definition of an efficient control framework for freeway systems. To this end, a Model Predictive Control scheme based on the cell transmission model is adopted in which the considered control action refers to ramp metering. Two major aspects characterize the paper. First, the prediction model is formulated as a mixed logical dynamical system (i.e. it is described by linear...
Objective of this paper is to define an efficient control framework for freeway systems based on ramp metering. First of all, a Model Predictive Control (MPC) scheme is proposed in which the well known nonlinear cell transmission model (CTM) is used for the prediction. The model is then reformulated as a mixed logical dynamical (MLD) system, i.e. it is described by linear dynamic equations and linear...
A two-level framework is proposed in this paper for a class of complex systems in order to optimize, at a tactical planning level, the activities over a medium-term horizon, and to control, at an operational level, the system resource functioning over a short-term horizon or in real time. At the tactical planning level, an aggregate model of the system is defined and an optimization problem is stated...
The particular complexity that characterizes a maritime port makes it belonging to the category of a system of systems. In fact, the functioning of a port is made possible thanks to the interaction of numerous subsystems, which in turn depend on other systems. The goal of the present paper is to provide a description of a port as a system of systems and to model and simulate the port rail process...
This paper deals with an inventory-production system in which raw parts are transformed into processed parts, in order to satisfy a time-varying positive demand over a given time horizon. The production resource is capacitated whereas the inventory is unbounded; the external demand is known and is expressed as a piecewise constant function changing at asynchronous time instants. The objective is to...
In this paper we present two mathematical formulations and a heuristic approach for the train load planning problem of import containers at a seaport container terminal. The problem consists of determining how to assign a set of containers of different length and weight to the wagons of a train in order to satisfy capacity constraints of both the wagons and the train, while minimizing the rehandling...
In this paper we deal with the operational planning of transportation operations in an intermodal network. The objective is to satisfy a given transportation demand by using road vehicles and trains, in order to minimize the total transportation cost and meeting a set of operational constraints. We propose a linear integer programming model and an Ant Colony Optimization metaheuristic approach in...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.