FOR MOST LAW ENFORCEMENT AND EMERGENCY SERVICES AGENCIES, THE costs related to the purchasing, equipping, operating and maintaining of fleets is the largest single recurring cost, outside that of personnel. The cost of acquiring vehicles, the costs associated with equipping and maintaining these vehicles, and escalating fuel costs have created difficulties for many departments— including police...

This paper introduces a large neighbourhood search heuristic for an airline recovery problem combining fleet assignment, aircraft routing and passenger assignment. Given an initial schedule, a list of disruptions, and a recovery period, the problem consists in constructing aircraft routes and passenger itineraries for the recovery period that allow the resumption of regular operations and minim...

the first international convention on maritime transportation is thebrussels’ convention of 1924. this convention was widely acceptedthroughout the world and; thus, lasted for a long time due to the widespreadsupport of the countries possessing fleet for this convention and the lack ofexistence of a legal document in terms of maritime transportation. thepassage of time together with innovations...

This document describes a FORTRAN IV subroutine named CAVAP (an acronym for conCAVe Assignment Problem) which uses a branch and bound method to solve a variant of the assignment problem in which the objective to be minimized is concave. It is assumed that m tasks are to be performed and n different kinds of machines have been defined for possible use in performing them. In general a task may be...

A unifying framework for the design and operation of networked coordinated systems has been researched with developments focusing on application in the management of autonomous vehicles which are subject to large external disturbances, such as wind gusts. The benchmark problem is the use of intervehicle communication and active control to effect collision avoidance in multi-vehicle systems with...

In this paper, we study the problem of managing an energy community hosting a fleet electric vehicles for rent. On day ahead, service requests are submitted to community. Then, optimal request-to-vehicle assignment has be found, as well charging schedule vehicle batteries. A suitable model is presented and included in existing architecture. The overall management formulated bi-level model, feat...

Electrified shared mobility services need to handle charging infrastructure planning and manage their daily operations minimize total operation time cost. However, existing studies tend address these problems separately. A new online vehicle-charging assignment model is proposed integrated into the fast location problem for dynamic ridesharing using electric vehicles. The latter formulated as a...

The future of US transport energy requirements and emissions is uncertain. Transport policy research has explored a number of scenarios to better understand the future characteristics of US light-duty vehicles. Deterministic scenario analysis is, however, unable to identify the impact of uncertainty on the future US vehicle fleet emissions and energy use. Variables determining the future fleet ...

The impact of a potential future fleet of supersonic aircraft on contrail coverage and contrail radiative forcing is investigated by means of simulations with the general circulation model ECHAM4.L39(DLR) including a contrail parameterization. The model simulations consider air traffic inventories of a subsonic fleet and of a combined fleet of suband supersonic aircraft for the years 2025 and 2...

Many optimization problems (from academia or industry) require the use of a local search to find a satisfying solution in a reasonable amount of time, even if the optimality is not guaranteed. Usually, local search algorithms operate in a search space which contains complete solutions (feasible or not) to the problem. In contrast, in Consistent Neighborhood Search (CNS), after each variable ass...