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A decomposition approach to the integrated vehicle-crew-rostering problem
Mesquita, Marta; Moz, Margarida; Paias, Ana; Pato, Margarida VazThe problem addressed in this paper is the integrated vehicle-crew-rostering problem (VCRP) aiming to define the schedules for the buses and the rosters for the drivers of a public transit company. The VCRP is described by a bi-objective mixed binary linear programming model with one objective function aggregating vehicle and crew scheduling costs and the other the rostering features. The VCRP is solved by a he...
Solving Public Transit Scheduling Problems
Mesquita, Marta; Moz, Margarida; Paias, Ana; Paixão, José; Pato, Margarida Vaz; Respício, AnaOperational planning within public transit companies has been extensively tackled but still remains a challenging area for operations research models and techniques. This phase of the planning process comprises vehicle scheduling, crew scheduling and rostering problems. In this paper, a new integer mathematical formulation to describe the integrated vehicle-crew-rostering problem is presented. The method propos...
Bi-objective Evolutionary Heuristics for Bus Drivers
Moz, Margarida; Respício, Ana; Pato, Margarida VazThe Bus Driver Rostering Problem refers to the assignment of drivers to the daily schedules of the company's buses, during a planning period of a given duration. The drivers' schedules must comply with legal and institutional rules, namely the Labour Law, labour agreements and the company's specific regulations. This paper presents a bi-objective model for the problem and two evolutionary heuristics differing a...
A Memetic Algorithm for a Bi-objective Bus Driver Rostering Problem
Respício, Ana; Moz, Margarida; Pato, Margarida VazThe Bus Driver Rostering Problem (DRP) consists of assigning bus drivers to daily duties during a planning period. The problem considers hard constraints imposed by institutional and legal requirements. Solutions should as much as possible satisfy soft constraints that qualify rosters according to either the company's or the drivers' interests. A bi-objective version of the DRP is considered and two models are ...
Solving a Bi-objective Nurse Rerostering Problem by Using a Utopic Pareto Genet...
Pato, Margarida Vaz; Moz, MargaridaNurse rerostering arises when at least one nurse announces that she will be unable to undertake the tasks previously assigned to her. The problem amounts to building a new roster that satisfies the hard constraints already met by the current one and, as much as possible, fulfils two groups of soft constraints which define the two objectives to be attained. A bi-objective genetic heuristic was designed on the ba...
Técnicas de investigação operacional aplicadas a um problema de escalonamento d...
Moz, MargaridaDoutoramento em Matemática Aplicada à Economia e à Gestão ; O objectivo desta dissertação é resolver um problema de escalonamento de pessoal em contexto hospitalar - o problema de substituição de pessoal em falta a escalas de serviço, aplicando técnicas de Investigação Operacional. Este problema consiste em reconstruir os planos de escalas quando acontecimentos inesperados impedem que uma ou mais enfermeiras e...
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