• Damaged durable goods, upgrades, andthe coase conjecture 

  Özener, Başak Altan (Mohr Siebeck, 2018-12)

  This study analyzes a damaged-goods market for a perfectly durable good in an infinite-horizon, discrete-time game. We characterize Markov perfect equilibria of this game under different buyer upgrade possibilities as a ...

• Reassessment and monitoring of loan applications with machine learning 

  Boz, Z.; Günneç, Dilek; Birbil, S. I.; Öztürk, M. K. (Taylor & Francis, 2018-11-26)

  Credit scoring and monitoring are the two important dimensions of the decision-making process for the loan institutions. In the first part of this study, we investigate the role of machine learning for applicant reassessment ...

• Rounding heuristics for multiple product dynamic lot-sizing in the presence of queueing behavior 

  Kang, Y.; Albey, Erinç; Uzsoy, R. (Elsevier, 2018-12)

  We present heuristics for solving a difficult nonlinear integer programming (NIP) model arising from a multi-item single machine dynamic lot-sizing problem. The heuristic obtains a local optimum for the continuous relaxation ...

• Influence maximization in social networks under Deterministic Linear Threshold Model 

  Gürsoy, F.; Danış, Dilek Günneç (Elsevier, 2018-12-01)

  We define the new Targeted and Budgeted Influence Maximization under Deterministic Linear Threshold Model problem and develop the novel and scalable TArgeted and BUdgeted Potential Greedy (TABU-PG) algorithm which allows ...

• Blood supply chain management and future research opportunities 

  Ekici, Ali; Özener, Okan Örsan; Göktürk, Elvin Çoban (Springer, 2018)

  In this chapter, we discuss the challenges and research opportunities in the blood collection operations and explore the benefits of recent advances in the blood donation process. According to the regulations, donated blood ...

• Load dependent lead time modelling: a robust optimization approach 

  Albey, Erinç; Yanıkoğlu, İhsan; Uzsoy, R. (IEEE, 2018-01-04)

  Although production planning models using nonlinear CFs have shown promising results for semiconductor wafer fabrication facilities, the lack of an effective methodology for estimating the CFs is a significant obstacle to ...

• Humanitarian relief supplies distribution: an application of inventory routing problem 

  Çankaya, Emre; Ekici, Ali; Özener, Okan Örsan (Springer, 2018-02-06)

  In this paper, we study the distribution of humanitarian relief supplies. In humanitarian relief, supplies including food, water and medication are received in batches/waves from the suppliers and the donors. Then, these ...

• Managing platelet supply through improved routing of blood collection vehicles 

  Özener, Okan Örsan; Ekici, Ali (Elsevier, 2018-10)

  In this paper, we study the routing of blood collection vehicles for improving the platelet supply in the blood supply chain. In order to extract platelets, donated blood has to be processed at a central processing facility ...

• Decision rule bounds for two-stage stochastic bilevel programs 

  Yanıkoğlu, İhsan; Kuhn, D. (Society for Industrial and Applied Mathematics Publications, 2018)

  We study two-stage stochastic bilevel programs where the leader chooses a binary here-and-now decision and the follower responds with a continuous wait-and-see decision. Using modern decision rule approximations, we construct ...

• Disaster preparedness using risk-assessment methods from earthquake engineering 

  Battarra, M.; Balçık, Burcu; Xu, H. (Elsevier, 2018-09-01)

  Analyzing the uncertainties associated with disaster occurrences is critical to make effective disaster preparedness plans. In this study, we focus on pre-positioning emergency supplies for earthquake preparedness. We ...

• Solving the integrated shipment routing problem of a less-than-truckload carrier 

  Özener, Okan Örsan (Elsevier, 2017)

  We study a less-than-truckload (LTL) transportation network and investigate the potential benefits of implementing an integrated solution approach for shipment routing throughout this network. In LTL transportation, shipments ...

• Çevik yöntemlerde cosmic i̇şlev puanı ve hikaye puanının birlikte kullanımı 

  Ertaban, C.; Gezgin, S.; Bağrıyanık, S.; Albey, Erinç; Karahoca, A. (CEUR-WS, 2017)

  Hikaye Puanı (SP: Story Point), Scrum ve Kanban gibi çevik yöntemlerde kullanılan en yaygın metriklerden birisidir. Subjektif bir metrik olsa da kullanışlı ve basit olması nedeniyle çevik ekiplerin birikim listelerinde ...

• An approach for predicting employee churn by using data mining 

  Yiğit, İ. O.; Shourabizadeh, Hamed (IEEE, 2017)

  Employee churn prediction which is closely related to customer churn prediction is a major issue of the companies. Despite the importance of the issue, there is few attention in the literature about. In this study, we ...

• Churn prediction for mobile prepaid subscribers 

  Can, Zehra; Albey, Erinç (Institute for Systems and Technologies of Information, Control and Communicatio, 2017)

  In telecommunication, mobile operators prefer to acquire postpaid subscribers and increase their incoming revenue based on the usage of postpaid lines. However, subscribers tend to buy and use prepaid mobile lines because ...

• Special issue in humanitarian operations 

  Balçık, Burcu (Elsevier, 2016-12)

• Site selection and vehicle routing for post-disaster rapid needs assessment 

  Balçık, Burcu (Elsevier, 2017-05)

  In the immediate aftermath of a disaster, relief agencies perform rapid needs assessment to investigate the effects of the disaster on the affected communities. Since assessments must be performed quickly, visiting all of ...

• Evaluation of sources for the sustainability of energy supply in Turkey 

  Kuleli Pak, B.; Albayrak, Y. E.; Erensal, Y. C. (Wiley, 2017)

  Energy is one of the main factors that must be considered in the discussions of sustainable development. Renewable, clean and cost effective energy sources are preferred but unfortunately no one of the alternative energy ...

• Multi-dimensional clearing functions for aggregate capacity modelling in multi-stage production systems 

  Albey, Erinç; Bilge, Ü.; Uzsoy, R. (Informa, 2017)

  Nonlinear clearing functions have been proposed in the literature as metamodels to represent the behaviour of production resources that can be embedded in optimisation models for production planning. However, most clearing ...

• A model to estimate cost-savings in diabetic foot ulcer prevention efforts 

  Barshes, N. R.; Saedi, S.; Wrobel, J.; Kougias, P.; Kundakçıoğlu, Ömer Erhun; Armstrong, D. G. (Elsevier, 2017)

  Background: Sustained efforts at preventing diabetic foot ulcers (DFUs) and subsequent leg amputations are sporadic in most health care systems despite the high costs associated with such complications. We sought to estimate ...

• A chance constraint based multi-item production planning model using simulation optimization 

  Albey, Erinç; Uzsoy, R.; Kempf, K. G. (IEEE, 2016)

  We consider a single stage multi-item production-inventory system under stochastic demand. We had previously proposed a production planning model integrating ideas from forecast evolution and inventory theory to plan work ...

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