Browsing by Author "Kundakçıoğlu, Ömer Erhun"
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AUC maximization for binary classification using combinatorial benders cuts
Sakarya, İbrahim Edhem (2019-06-11)The purpose of this study is to maximize the area under Receiver Operating Characteristic curve for binary classi cation problems using a scoring-based mixed integer linear programming formulation. We investigate exact ... -
Decomposing time series data via mixed integer programming
Gözüyılmaz, Şeyma (2020-01-13)Decomposing time series into seasonality, trend, and remainder reveals underlying insights to be used in forecasting and anomaly detection. Although there are several decomposition methods, no method guarantees all of the ... -
An exact approach to maximize area under receiver operator characteristic curve for multi-instance learning
Atasoy, Gizem (2018-08)The purpose of this study is to solve the multi-instance classi cation problem by directly maximizing the area under Receiver Operating Characteristic (ROC) curve (i.e., AUC). We derive a mixed integer linear programming ... -
Exact approaches for the no wait flowshop problem
Tuzcu, Ahmet Emir (2019-06-11)In this study, no wait flow shop problem, which is a variant of permutation flow shop, is investigated. In a no wait flow shop, after processing of a job is started, it must be processed completely without any delay or ... -
A healthcare inventory problem with both reliable and unreliable supply channels
Tüfekçi, Mihriban Büşra (2016-05)In this study, we investigate the inventory review policy for a healthcare facility to minimize the impact of inevitable drug shortages when an alternative reliable supplier is present. A continuous-time stochastic process ... -
Robust scheduling for parallel machines with sequence dependent setup times and uncertain breakdowns
Top, Ayşenur Betül (2017-08)In this study, machine scheduling activities in the plastic injection production facility of a company competing in electronic sector is investigated. The company designs the products and picks order from customers for ... -
Service level satisfaction during shortages for health networks: base stock inventory and transshipment policies
Bozkır, Cem Deniz Çağlar (2018-05)In this study, we consider a system of healthcare providers, which face the same uncertain supply disruptions (e.g., regional, nationwide, or worldwide drug shortages). Each hospital observes a stochastic demand and if ... -
A workforce planning model for fair schedules considering employee satisfaction, service level, and operating cost
Şimşek, Onur (2019-06-11)We study workforce planning issues for call centers and propose a solution approach with a scheduling model. In this study, we emphasize the effects of employee satisfaction, fair distribution of shifts, and agent-related ...
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