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Endüstri Mühendisliği Bölümü Yayın Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/279

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Browsing Endüstri Mühendisliği Bölümü Yayın Koleksiyonu by Department "Çankaya Üniversitesi, Mühendislik Fakültesi, Endüstri Mühendisliği"

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    Citation Count: Kurt, Atil; Cetinkaya, Ferda Can; Azizoglu, Meral, "A blood distribution problem with new transportation options - an application for the Turkish Red Crescent", European Journal of Industrial Engineering, Vol. 13, No. 3, pp. 332-367, (2019).
    A blood distribution problem with new transportation options - an application for the Turkish Red Crescent
    (Inderscience Enterprises LTD, 2019) Kurt, Atıl; Çetinkaya, Ferda Can; Azizoğlu, Meral; 50129
    This paper considers the blood distribution problem in the Central Anatolian Regional Blood Centre of the Turkish Red Crescent (TRC) and proposes several demand satisfaction options considering the irradiation centres, urgent demands, and product availability. Our aim is to maximise the total weighted blood demand satisfaction. To address the problem, we develop a mixed integer linear programming model and propose a hybrid genetic algorithm (HGA). The results of our experiments have revealed that the mathematical model cannot handle even small sized problem instances in reasonable times; however, the hybrid genetic algorithm is capable of handling complex daily operations of the Turkish Red Crescent.
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    Citation Count: Aydemir-Karadag, Ayyuce, "A profit-oriented mathematical model for hazardous waste locating-routing problem", Journal of Cleaner Production, Vol. 202, pp. 213-225, (2018).
    A profit-oriented mathematical model for hazardous waste locating-routing problem
    (Elsevier SCI LTD, 2018) Aydemir-Karadağ, Ayyüce; 116059
    Hazardous waste management (HWM) deals with the safe, efficient and cost effective collection, transportation, treatment and disposal of wastes. This paper presents a profit-oriented mixed integer mathematical model for the hazardous waste location-routing problem, which incorporates the energy recovery from waste and the application of the polluter pays principle. The suggested model decides on the locations and numbers of recycling, incineration, sterilization, interim storage and disposal centers and on how to transfer various types of hazardous waste and waste residues among these centers from the perspective of environmental protection. The proposed model was implemented in a real life case study and tested on various hypothetical problem instances. In addition, an extended formulation was developed on a rolling horizon basis through the objective function of Net Present Value (NPV) to analyze the overall profitability of the entire HWM system for long-term planning and a sensitivity study was conducted on different interest rates. The results show that the model is applicable to real-life waste management systems and it can provide effective solutions for large-scale HWM problems. (C) 2018 Elsevier Ltd. All rights reserved.
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    Article
    Citation Count: Sahin-Arslan, Aysenur; Ertem, Mustafa Alp, "A Warehouse Design With Containers For Humanitarian Logistics: A Real-Life Implementation From Turkey", International Journal of Industrial Engineering-Theory Applications and Practice, Vol. 26, No. 2, pp. 139-155, (2019).
    A Warehouse Design With Containers For Humanitarian Logistics: A Real-Life Implementation From Turkey
    (Univ Cincinnati Industrial Engineering, 2019) Şahin-Arslan, Ayşenur; Ertem, Mustafa Alp; 52460
    The purpose of this study is to investigate how and at what cost freight containers could be used as an inventory holding mechanism for humanitarian logistics. The layout and cost comparison of two alternatives are performed-stocking in a warehouse and material storage in containers. An optimum layout for storage in containers is proposed. It was found that container stockpiling uses the available area and space better than the warehouse option to stock the same number of material pallets. Leasing and purchasing costs of these alternatives are compared using present worth analysis. The results revealed that the container leasing option is not cost effective when land cost is included. Warehouse leasing results in the least setup cost, however, it incurs more operating costs, including lighting, ventilation, and maintenance as well as handling of the pallets. A real-life implementation of the proposed container stockpiling idea is presented for Turkey.
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    Article
    Citation Count: Silav, Ahmet; Karasakal, Orhan; Karasakal, Esra, "Bi-objective missile rescheduling for a naval task group with dynamic disruptions", Naval Research Logisics, Vol. 66, No. 7, pp. 596-615, (2019).
    Bi-objective missile rescheduling for a naval task group with dynamic disruptions
    (Wiley, 2019) Sılav, Ahmet; Karasakal, Orhan; Karasakal, Esra; 216553
    This paper considers the rescheduling of surface-to-air missiles (SAMs) for a naval task group (TG), where a set of SAMs have already been scheduled to intercept a set of anti-ship missiles (ASMs). In missile defense, the initial engagement schedule is developed according to the initial state of the defensive and attacking units. However, unforeseen events may arise during the engagement, creating a dynamic environment to be handled, and making the initial schedule infeasible or inefficient. In this study, the initial engagement schedule of a TG is assumed to be disrupted by the occurrence of a destroyed ASM, the breakdown of a SAM system, or an incoming new target ASM. To produce an updated schedule, a new biobjective mathematical model is formulated that maximizes the no-leaker probability value for the TG and minimizes the total deviation from the initial schedule. With the problem shown to be NP-hard, some special cases are presented that can be solved in polynomial time. We solve small size problems by the augmented epsilon-constraint method and propose heuristic procedures to generate a set of nondominated solutions for larger problems. The results are presented for different size problems and the total effectiveness of the model is evaluated.
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    Article
    Citation Count: Cetinkaya, Ferda C.; Duman, Mehmet, "Lot streaming in a two-machine mixed shop" International Journal of Advanced Manufacturing Technology, Vol. 49, No. 9-12, pp. 1161-1173,(2010)
    Lot Streaming In A Two-Machine Mixed Shop
    (Springer London LTD, 2010) Çetinkaya, Ferda Can; Duman, Mehmet; 50129
    Most classical scheduling models overlook the fact that products are often produced in job lots and assume that job lots are indivisible single entities, although an entire job lot consists of many identical items. However, splitting an entire lot (process batch) into sublots (transfer batches) to be moved to downstream machines allows the overlapping of different operations on the same product while work needs to be completed on the upstream machine. This approach is known as lot streaming in scheduling theory. In this study, the lot streaming problem of multiple jobs in a two-machine mixed shop where there are two different job types as flow shop and open shop is addressed so as to minimize the makespan. The optimal solution method is developed for the mixed shop scheduling problem in which lot streaming can improve the makespan.