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  • Optimal project duration for resource leveling 

    Eren, Elif; Atan, Sabri Tankut (ELSEVIER SCIENCE BV, 2018-04-16)
    Resource leveling is important in project management as resource fluctuations are costly and undesired. Typically, schedules with better resource profiles are obtained by shifting the activities within their float times ...
  • Simultaneous scheduling of football games and referees using Turkish league data 

    Atan, Sabri Tankut; Hüseyinoǧlu, Olgu Pelin (Blackwell Publishing Ltd., 2017-05-01)
    Assignment decisions of referees to football (soccer) games are highly debated in sports media. Referee assignments are typically done on a weekly basis as the league progresses. However, this practice ignores important ...
  • A mathematical model for perishable products with price- and displayed-stock-dependent demand 

    Önal, Mehmet; Yenipazarlı, Arda; Kundakçıoğlu, O. Erhun (Elsevier Ltd., 2016-12-01)
    We introduce an economic order quantity model that incorporates product assortment, pricing and space-allocation decisions for a group of perishable products. The goal is to maximize the retailer's profit under shelf-space ...
  • Economic Impacts of Increased US Exports of Natural Gas: An Energy System Perspective 

    Sarıca, Kemal (MDPI AG, 2016-06)
    With the recent shale gas boom, the U.S. is expected to have very large natural gas resources. In this respect, the key question is would it be better to rely completely on free market resource allocations which would lead ...
  • Economic impacts of increased U.S. exports of natural gas: An energy system perspective 

    Sarica, Kemal; Tyner, Wallace E. (MDPI AG, 2016-06)
    With the recent shale gas boom, the U.S. is expected to have very large natural gas resources. In this respect, the key question is would it be better to rely completely on free market resource allocations which would lead ...
  • The two-level economic lot sizing problem with perishable items 

    Önal, Mehmet (Elsevier, 2016-05-01)
    We present an economic lot sizing model of a supply chain for the procurement and distribution of a perishable item. We assume that the consumers always buy the item that lasts longer. We show that determining optimal ...
  • A nonparametric approach for optimal reliability allocation in health services 

    Aksezer, Sezgin Çağlar (Emerald Group Publishing Ltd., 2016-02-01)
    Reliability evaluation of healthcare services has been a challenging task for both operations managers and system engineers working in the respective field. The purpose of this paper is to develop a data envelopment ...
  • Interdependent network restoration: On the value of information-sharing 

    Sharkey, Thomas C.; Çavdaroğlu, Burak; Nguyen, Huy; Holman, Jonathan; Mitchell, John E. M.; Wallace, William Al (ELSEVIER SCIENCE BV, 2015-07-01)
    We consider restoring multiple interdependent infrastructure networks after a disaster damages components in them and disrupts the services provided by them. Our particular focus is on interdependent infrastructure restoration ...
  • The economic lot-sizing problem with perishable items and consumption order preference 

    Önal, Mehmet; Romeijn, H. Edwin; Sapra, Amar; Van den Heuvel, Wilco (Elsevier Science Bv, 2015-08-01)
    We consider the economic lot-sizing problem with perishable items (ELS-PI), where each item has a deterministic expiration date. Although all items in stock are equivalent regardless of procurement or expiration date, we ...
  • Multiresponse optimisation of powder metals via probabilistic loss functions 

    Aksezer, Sezgin Çağlar; Benneyan, James C. (Inderscience Enterprises LTD., 2013)
    Quadratic loss functions have been used extensively within the context of quality engineering and experimental design for process and product optimisation and robust design. In general, this approach determines optimal ...
  • A note on "The economic lot sizing problem with inventory bounds" 

    Önal, Mehmet; Van den Heuvel, Wilco; Liu, Tieming (ELSEVIER SCIENCE BV, 2012-11-06)
    In a recent paper, Liu [3] considers the lot-sizing problem with lower and upper bounds on the inventory levels. He proposes an O(n(2)) algorithm for the general problem, and an O(n) algorithm for the special case with ...
  • Reliability evaluation of healthcare services by assessing the technical efficiency 

    Aksezer, Sezgin Çağlar (Routledge Journals, Taylor & Francis LTD., 2011)
    Classical reliability analysis techniques of manufacturing and defence industries are not a perfect fit for the assessment of the reliability of services. This is partly due to the lack of proper and valid reliability ...
  • Failure analysis and warranty modeling of used cars 

    Aksezer, Sezgin Çağlar (Pergamon-Elsevier Science LTD., 2011-09)
    Reliability is an important aspect of product perception and manufacturers are compelled to take corrective actions on the items failing within the warranty period. Automotive manufacturers are being exposed to significant ...
  • Re-mining item associations: Methodology and a case study in apparel retailing 

    Demiriz, Ayhan; Ertek, Gürdal; Atan, Sabri Tankut; Kula, Ufuk (ELSEVIER SCIENCE BV, 2011-12)
    Association mining is the conventional data mining technique for analyzing market basket data and it reveals the positive and negative associations between items. While being an integral part of transaction data, pricing ...
  • Investment in improved inventory accuracy in a decentralized supply chain 

    Uçkun, Canan; Karaesmen, Fikri; Savaş, Selçuk (ELSEVIER SCIENCE BV, 2008-06)
    It is known that inaccurate inventory records can lead to profit losses in a supply chain. Inventory records may not be correct due to various reasons such as transaction errors, misplacement, shrinkage, etc. In order to ...
  • On the sensitivity of desirability functions for multiresponse optimization 

    Aksezer, Sezgin Çağlar (Amer Inst Mathematical Sciences, 2008-11)
    Desirability functions have been one of the most important multiresponse optimization technique since the early eighties. Main reasons for this popularity might be counted as the convenience of the implementation of the ...
  • Tractable supply chain production planning, modeling nonlinear lead time and quality of service constraints 

    Anlı, Osman Murat; Caramanis, MC; Paschalidis, Ioannis Ch.; TR59236 (Elsevier Ltd, 2007)
    This paper addresses the task of coordinated planning of a supply chain (SC). Work in process (WIP) in each facility participating in the SC, finished goods inventory, and backlogged demand costs are minimized over the ...

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