Leadership and Management

Permanent URI for this collection

https://dspace.lib.cranfield.ac.uk/handle/1826/20717

Browse

Browsing Leadership and Management by Author "Aktas, Emel"

Now showing 1 - 4 of 4
  • No Thumbnail Available
    ItemOpen Access
    A decision support system to improve service quality in multimodal rapid rail systems: a bayesian perspective
    (Cranfield University, 2018-01-02 09:16) Yanik, Seda; Aktas, Emel; Ilker Topcu, Y
    Presentation of the work in the 41st International Conference on Computers and Industrial Engineering
  • No Thumbnail Available
    ItemOpen Access
    Data supporting the publication 'Product-service systems and circular supply chain practices in UK SMEs: The moderating effect of internal environmental orientation'
    (Cranfield University, 2022-04-19 16:54) Kuhl, Carl; Bourlakis, Michael; Aktas, Emel; Skipworth, Heather
    Data file 1. PSSandCSCinUK_JBR.csv Data are available under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0). Many studies uphold product-service systems (PSSs) as key factors for the implementation of circular supply chain (CSC) practices. This paper explores this assumption by testing the links between product-, use- and result-oriented PSSs and slowing, closing, and narrowing CSC practices. It develops and validates survey items that can be used to benchmark CSC practice implementation. In addition, it tests a model that recognises the positive moderating role of internal environmental orientation. A survey is conducted with 114 manufacturing small and medium-sized enterprises (SMEs) in the United Kingdom (UK). Partial least squares structural equation modelling is conducted to evaluate two models. The results show that product-oriented PSSs positively affect the slowing, use-oriented positively affects the closing, and result-oriented positively affects the slowing and the narrowing of resource loops. Internal environmental orientation does not moderate the PSS – CSC relationship, suggesting that less internally environmentally oriented firms are not at a disadvantage.
  • No Thumbnail Available
    ItemOpen Access
    Data underpinning "Green scheduling of a two-machine flowshop: Trade-off between makespan and energy consumption"
    (Cranfield University, 2017-04-24 09:39) Aktas, Emel; Mansouri, Afshin
    Sustainability considerations in manufacturing scheduling, which is traditionally influenced by service oriented performance metrics, have rarely been adopted in the literature. This paper aims to address this gap by incorporating energy consumption as an explicit criterion in shop floor scheduling. Leveraging the variable speed of machining operations leading to different energy consumption levels, we explore the potential for energy saving in manufacturing. We analyze the trade-off between minimizing makespan, a measure of service level and total energy consumption, an indicator for environmental sustainability of a two-machine sequence dependent permutation flowshop. We develop a mixed integer linear multi-objective optimization model to find the Pareto frontier comprised of makespan and total energy consumption. To cope with combinatorial complexity, we also develop a constructive heuristic for fast trade-off analysis between makespan and energy consumption. We define lower bounds for the two objectives under some non-restrictive conditions and compare the performance of the constructive heuristic with CPLEX through design of experiments. The lower bounds that we develop are valid under realistic assumptions since they are conditional on speed factors. The Pareto frontier includes solutions ranging from expedited, energy intensive schedules to prolonged, energy efficient schedules. It can serve as a visual aid for production and sales planners to consider energy consumption explicitly in making quick decisions while negotiating with customers on due dates. We provide managerial insights by analyzing the areas along the Pareto frontier where energy saving can be justified at the expense of reduced service level and vice versa.
  • Thumbnail Image
    ItemOpen Access
    Dissemination Event Presentation
    (Cranfield University, 2018-04-03 10:07) Sharif, Amir; Aktas, Emel
    These are the presentation slides for the SAFE-Q Dissemination Event held on 19 March 2018 at Georgetown University Qatar.