Browsing Industrial Engineering by OzU Authors "Albey, Erinç"
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A CART-based genetic algorithm for constructing higher accuracy decision trees
Ersoy, Elif; Albey, Erinç; Kayış, Enis (SciTePress, 2020)Decision trees are among the most popular classification methods due to ease of implementation and simple interpretation. In traditional methods like CART (classification and regression tree), ID4, C4.5; trees are constructed ... -
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 ... -
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 ... -
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 ... -
A data-driven matching algorithm for ride pooling problem
Şahin, Ahmet; Sevim, İ.; Albey, Erinç; Güler, M. G. (Elsevier, 2022-04)This paper proposes a data-driven matching algorithm for the problem of ride pooling, which is a transportation mode enabling people to share a vehicle for a trip. The problem is considered as a variant of matching problem, ... -
A decomposition based metaheuristic approach for solving rapid needs assessment routing problem
Mıhçıoğlu, Yurtsev; Albey, Erinç (Elsevier, 2021-09)This paper proposes a decomposition based tabu search algorithm for solving multi-cover routing problem in the case of rapid need assessment. Rapid needs assessment aims to evaluate impact of a disaster at different sites ... -
Economic lot sizing problem with inventory dependent demand
Önal, Mehmet; Albey, Erinç (Springer Nature, 2020-11)We consider an economic lot sizing problem where the demand in a period is a piecewise linear and concave function of the amount of the available inventory after production in that period. We show that the problem isNPhard ... -
Economic lot sizing problem with tank scheduling
Önal, Mehmet; van den Heuvel, W.; Dereli, Meryem Merve; Albey, Erinç (Elsevier, 2023-07-01)We introduce a multiple-item economic lot sizing problem where items are produced through the fermentation of some raw materials. Fermentation takes place in specialized tanks that have finite capacities, and duration of ... -
Effective training methods for automatic musical genre classification
Atsız, Eren; Albey, Erinç; Kayış, Enis (SciTePress, 2019)Musical genres are labels created by human and based on mutual characteristics of songs, which are also called musical features. These features are key indicators for the content of the music. Rather than predictions by ... -
A hierarchical approach for solving simultaneous lot sizing and scheduling problem with secondary resources
Şafak, C. U.; Yılmaz, Görkem; Albey, Erinç (Elsevier, 2019)This study represents a decomposition heuristic approach for simultaneous lot sizing and scheduling problem for multiple product, multiple parallel machines with secondary resources. The motivation of the study comes from ... -
International roaming traffic optimization with call quality
Şahin, Ahmet; Demirel, Kenan Cem; Albey, Erinç; Gürsun, Gonca (SciTePress, 2019)In this study we focus on a Steering International Roaming Traffic (SIRT) problem with single service that concerns a telecommunication’s operators’ agreements with other operators in order to enable subscribers access ... -
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 ... -
A Markovian approach for time series prediction for quality control
Şahin, Ahmet; Sayımlar, Ayşe Dilara; Teksan, Zehra Melis; Albey, Erinç (Elsevier, 2019)In this work we aim to predict quality levels of incoming batches of a selected product type to a white goods manufacturer from a third party supplier. We apply a Markov Model that captures the quality level of the incoming ... -
A mathematical model for customer lifetime value based offer management
Şahin, Ahmet; Can, Zehra; Albey, Erinç (Springer, 2018)Customers with prepaid lines possess higher attrition risk compared to postpaid customers, since prepaid customers do not sign long-term obligatory contracts and may churn anytime. For this reason, mobile operators have ... -
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 ... -
Neural network estimators for optimal tour lengths of traveling salesperson problem instances with arbitrary node distributions
Varol, Taha; Özener, Okan Örsan; Albey, Erinç (Informs, 2024)It is essential to solve complex routing problems to achieve operational efficiency in logistics. However, because of their complexity, these problems are often tackled sequentially using cluster-first, route-second ... -
Optimal pricing and inventory strategies for fashion products under time-dependent interest rate and demand
Akan, M.; Albey, Erinç; Güler, M. G. (Elsevier, 2021-04)In this work we consider the dynamic pricing problem of a retailer operating in a market with a single fashion item and under time-dependent interest rate. The demand is assumed to be deterministic and dependent on the ... -
Optimizing steering of roaming traffic with a-number billing under a rolling horizon policy
Şahin, Ahmet; Demirel, Kenan Cem; Ceyhan, Ege; Albey, Erinç (Springer, 2020)In this study, we focus on single service steering international roaming traffic (SIRT) problem by considering telecommunication operators’ agreements and “a-number billing” while keeping service quality above a certain ... -
A robust optimization approach for production planning under exogenous planned lead times
Albey, Erinç; Yanıkoğlu, İhsan; Uzsoy, R. (IEEE, 2019)Many production planning models applied in semiconductor manufacturing represent lead times as fixed exogenous parameters. However, in reality, lead times must be treated as realizations of released lots' cycle times, which ... -
Robust parameter design and optimization for quality engineering
Yanıkoğlu, İhsan; Albey, Erinç; Okçuoğlu, S. (Springer, 2022-03)This paper proposes a methodology to determine the optimal settings of key decision variables that affect the resilience of an engineering design against uncertainty. Uncertainty in quality engineering is often caused by ...
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