134,062 research outputs found

    A scenario aggregation based approach for determining a robust airline fleet composition

    Get PDF
    Strategic airline fleet planning is one of the major issues addressed through newly initiated decision support systems, designed to assist airlines and aircraft manufacturers in assessing the benefits of the emerging concept of dynamic capacity allocation. We present background research connected with such a system, which aims to explicitly account for the stochastic nature of passenger demand in supporting decisions related to the fleet composition problem. We address this problem through a scenario aggregation based approach and present results on representative case studies based on realistic data. Our investigations establish clear benefits of a stochastic approach as compared with deterministic formulations, as well as its implementation feasibility using state-of-the-artoptimization software.Dynamic capacity allocation;Airline fleet composition;Stochastic programming;Scenario aggregation;Fleet assignment

    Manufacturing in the 1990s - productivity, flexibility and innovation

    Get PDF
    The article outlines the evolution of large multinationals as a result of the appearance of new market demands. Companies having to meet specific market demands, are shown to possess certain characteristics, related to the market demands concerned. The analysis shows that innovativeness will, in all probability, be the new market demand in the 1990s, in addition to the already existing ones of efficiency, quality and flexibility. Descriptions of ideal types illustrate the evolution of companies as they move from the Efficient Firm to the Quality Firm on to the Flexible Firm to, finally, the Innovative Firm. The phase model also includes the symptoms of crisis, when moving from one phase to another. Skipping phases appears to be difficult, if not impossible. The same holds true for moving to the next phase, while the organization has not finished with the preceding phase

    On green routing and scheduling problem

    Full text link
    The vehicle routing and scheduling problem has been studied with much interest within the last four decades. In this paper, some of the existing literature dealing with routing and scheduling problems with environmental issues is reviewed, and a description is provided of the problems that have been investigated and how they are treated using combinatorial optimization tools
    • …
    corecore