Browsing by Author "Kundakcıoğlu, Ömer Erhun"
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Aid allocation for camp-based and urban refugees with uncertain demand and replenishments
Azizi, S.; Bozkır, Cem Deniz Çağlar; Trapp, A. C.; Kundakcıoğlu, Ömer Erhun; Kurbanzade, Ali Kaan (Wiley, 2021-12)There are 26 million refugees worldwide seeking safety from persecution, violence, conflict, and human rights violations. Camp-based refugees are those that seek shelter in refugee camps, whereas urban refugees inhabit ... -
Cost of fairness in agent scheduling for contact centers
Şimşek, Onur; Kundakcıoğlu, Ömer Erhun (American Institute of Mathematical Sciences, 2022-03)We study a workforce scheduling problem faced in contact centers with considerations on a fair distribution of shifts in compliance with agentpreferences. We develop a mathematical model that aims to minimize operatingcosts ... -
An EOQ model with deteriorating items and self-selection constraints
Önal, Mehmet; Kundakcıoğlu, Ömer Erhun (Springer Nature, 2020-09)In this paper, we consider a store that sells two vertically differentiated items that might substitute each other. These items do not only differ in quality and price, but they also target two different customer segments. ... -
Exact and heuristic approaches to detect failures in failed k-out-of-n systems
Yavuz, Tonguç; Kundakcıoğlu, Ömer Erhun; Ünlüyurt, T. (Elsevier, 2019-12)This paper considers a k-out-of-n system that has just failed. There is an associated cost of testing each component. In addition, we have apriori information regarding the probabilities that a certain set of components ... -
A fluid approximation for the single-leg fare allocation problem with nonhomogeneous poisson demand
Korkmaz, Mehmet Selçuk; Kundakcıoğlu, Ömer Erhun; Sivrikaya, O. (Springer, 2022-02-27)Fare allocation for legs and O&D pairs plays a crucial role in airline revenue management. Despite a large number of dynamic pricing studies, there are only a few widely adopted studies in which assumptions affect most ... -
Healthcare data analytics
Yang, H.; Kundakcıoğlu, Ömer Erhun; Zeng, D. (Springer International Publishing, 2015-11)New advances in Information and Communication Technologies (ICT), Operations Research (OR), Artificial Intelligence (AI), and Data Mining (DM) are transforming how healthcare is delivered and managed around the world. ... -
Healthcare intelligence: Turning data into knowledge
Yang, H.; Kundakcıoğlu, Ömer Erhun (IEEE, 2014)Exceptional opportunities exist for researchers and practitioners to invest in conducting innovative and transformative research in data mining and health informatics. This IEEE Intelligent Systems "Trends and Controversies" ... -
Healthcare inventory management in the presence of supply disruptions and a reliable secondary supplier
Shourabizadeh, H.; Kundakcıoğlu, Ömer Erhun; Bozkır, Cem Deniz Çağlar; Tüfekçi, Mihriban Büşra; Henry, A. C. (Springer, 2023-12)We study the inventory review policy for a healthcare facility to minimize the impact of inevitable drug shortages. Usually, healthcare facilities do not rely on a single source of supply, and alternative mechanisms are ... -
Hospital service levels during drug shortages: Stocking and transshipment policies for pharmaceutical inventory
Bozkır, Cem Deniz Çağlar; Kundakcıoğlu, Ömer Erhun; Henry, A. C. (Springer, 2022-07)In this study, we consider a health network that faces uncertain supply disruptions in the form of regional, nationwide, or worldwide drug shortages. Each hospital observes stochastic demand and if the drug is unavailable, ... -
Hospital service levels during drug shortages: Stocking and transshipment policies for pharmaceutical inventory
Bozkır, Cem Deniz Çağlar; Kundakcıoğlu, Ömer Erhun; Henry, A. C. (Springer, 2022-07)In this study, we consider a health network that faces uncertain supply disruptions in the form of regional, nationwide, or worldwide drug shortages. Each hospital observes stochastic demand and if the drug is unavailable, ... -
A literature review on inventory management in humanitarian supply chains
Koyuncu, Burcu Balçık; Bozkir, Cem Deniz Çağlar; Kundakcıoğlu, Ömer Erhun (Elsevier, 2016)In this paper, we present a review and analysis of studies that focus on humanitarian inventory planning and management. Specifically, we focus on papers which develop policies and models to determine how much to stock, ... -
A mathematical model for perishable products with price- and displayed-stock-dependent demand
Onal, M.; Yenipazarli, A.; Kundakcıoğlu, Ömer Erhun (Elsevier, 2016-12)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 ... -
Mathematical optimization for time series decomposition
Gözüyılmaz, Şeyma; Kundakcıoğlu, Ömer Erhun (Springer, 2021-09)Decomposing time series into trend and seasonality components reveals insights used in forecasting and anomaly detection. This study proposes a mathematical optimization approach that addresses several data-related issues ... -
Mitigating the impact of drug shortages for a healthcare facility: An inventory management approach
Saedi, S.; Kundakcıoğlu, Ömer Erhun; Henry, A. C. (Elsevier, 2016-05-16)Despite the importance and value of the pharmaceutical market, a significant portion of procurement spending including pharmaceuticals are lost. Coupling poor and reactive management practices with the inevitable national ... -
A model to estimate cost-savings in diabetic foot ulcer prevention efforts
Barshes, N. R.; Saedi, S.; Wrobel, J.; Kougias, P.; Kundakcıoğlu, 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 ... -
Multi-instance learning by maximizing the area under receiver operating characteristic curve
Sakarya, I. E.; Kundakcıoğlu, Ömer Erhun (Springer, 2023-02)The purpose of this study is to solve the multi-instance classification problem by maximizing the area under the Receiver Operating Characteristic (ROC) curve obtained for witness instances. We derive a mixed integer linear ... -
Testing and scheduling applications under uncertainty
Yavuz, Tonguç (2021-02)In this thesis, we consider two different optimization problems under uncertainty. The first problem is identifying defective components in failed k-out-of-n systems. In the second part, we study the parallel machine ...
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