Recursos de colección

Biblioteca Digital do IPB (53.442 recursos)

A Biblioteca Digital do IPB, tem por objectivo divulgar e permitir o livre acesso à produção científica produzida pela comunidade académica, promovendo a integração, partilha e a visibilidade da informação científica e garantindo a preservação da memória intelectual do Instituto Politécnico de Bragança.

DGI - Comunicações em Encontros Científicos Indexadas ao ISI

Mostrando recursos 1 - 5 de 5

  1. Simulation as a decision support tool in maintenance float systems – the automatic generation of simulation programs

    Peito, Francisco; Pereira, Guilherme; Leitão, Armando; Dias, Luís M.S.
    This paper is concerned with the use of simulation as a decision support tool in maintenance systems, specifically in MFS (Maintenance Float Systems). For this purpose and due to its high complexity, in this paper the authors propose a flexible way to develop typical MFS models, for any number of machines in the workstation, spare machines and maintenance crews. Arena® simulation language is used to understand a specific MFS, create the corresponding MFS model and analyze most common performance measures.
    - 24-ene-2018

  2. Performance comparison between retailing stores using a Malmquist-type index

    Vaz, Clara B.; Camanho, Ana
    This study develops a framework that combines different methods to provide insights regarding the performance of retailing stores. Firstly, the framework enables to specify appropriate targets for stores using DEA. This involves comparing stores within homogeneous groups. Secondly, the framework compares the overall performance of these groups. This requires the combined use of Malmquist type index and statistical tests. This index is decomposed into components for comparing the efficiency spread between groups and the productivity differences between the best-practice frontiers of the groups.
    - 24-ene-2018

  3. A linear programming model for the storage location assignment problem: a case study

    Geraldes, Carla A.S.; Carvalho, Sameiro; Pereira, Guilherme
    An important warehouse operation decision concerns the definition of a storage location policy, including the definition of functional areas and the identification of each stock item location in the warehouse. Empirical approaches are often used. However, they do not guarantee that the lowest cost materials-handling solution is achieved. This paper presents a clustering approach to address the assignment of stock items to particular warehouse functional areas. A linear programming model is adapted to a case study and its performance is assessed through the use of real data. Model is solved using LINGO 9.0 mixed integer commercial solver. The output of...
    - 26-abr-2018

  4. Solving a multiprocessor problem by column generation and branch-and-price

    Duarte, António J.S.T.; Carvalho, J.M. Valério de
    This work presents an algorithm for solving exactly a scheduling problem with identical parallel machines and malleable tasks, subject to arbitrary release dates and due dates. The objective is to minimize a function of late work and setup costs. A task is malleable if we can freely change the set of machines assigned to its processing over the time horizon. We present an integer programming model, a Dantzig-Wolfe decomposition reformulation and its solution by column generation. We also developed an equivalent network flow model, used for the branching phase. Finally, we carried out extensive computational tests to verify the algorithm’s efficiency and to determine the model’s...
    - 07-mar-2018

  5. The assessment of retailing efficiency using network data envelopment analysis

    Vaz, Clara B.; Camanho, Ana; Guimarães, Rui
    APDIO - Associação Portuguesa de Investigação Operacional e EURO
    - 24-ene-2018

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