Ozden Engin Cakici | American University (original) (raw)

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Papers by Ozden Engin Cakici

Social Science Research Network, 2023

Operations Research Letters

SSRN Electronic Journal, 2021

Decision Sciences, 2019

In hospitals, replenishment order information for medical items go through multiple departments b... more In hospitals, replenishment order information for medical items go through multiple departments before it is submitted to the medical supplier. At times, order information is inadvertently lost on the way, leading to order loss. In this article, using our case study conducted at magnetic resonance imaging (MRI) units of a hospital, we propose a periodic review base stock inventory policy that takes order loss into account. Our proposed inventory policy helps in two respects. It provides insights about how to mitigate order loss and establishes a minimum inventory cost benchmark for hospitals so they can readily conduct incremental cost-benefit analysis before implementing a process improvement. We find that more frequent order losses do not necessarily lead to higher base stock levels. The review period plays a key role. We empirically find that, even when order loss is rare, the inventory costs go up appreciably. Hence, we also quantify the potential benefits of two technology features to improve a hospital's ordering process: computerized order entry and transfer (COET), which may eliminate order loss, and real-time item tracking (RTIT), which reduces inventory costs further via continuous review of inventory. Our results indicate that savings by our proposed inventory policy or the two technology features are greatly increased at high service levels, percentage of time in stock, which is true for many hospitals.[

Many patients have a choice of a provider for acute care, typically choosing between an Urgent Ca... more Many patients have a choice of a provider for acute care, typically choosing between an Urgent Care facility (UC) or an Emergency Department of a hospital (ED). This choice is made by a patient who is generally not herself a trained medical professional. She is strategic but imperfectly informed in that she weighs all the costs and benefits of this choice, including quality of care, waiting time, co-payments and fees, but can only imperfectly assess the appropriateness of a facility for the perceived needed care. The manager of the UC sets the fee for service in competition with an ED to influence the choice by patients, and takes into account the factors that affect the patient. We show that a separating equilibrium, in which all patients self-triaged as non-critical choose to go to the UC first, dominates pooling equilibria for moderate error rates in self-triage. We analyze the separating equilibrium further and show that the co-pay for an UC decreases, the facility is smaller, a...

Proceedings of the 50th Hawaii International Conference on System Sciences (2017), 2017

Consumer healthcare information plays a critical role in informing patients who participate in or... more Consumer healthcare information plays a critical role in informing patients who participate in or make healthcare decisions for themselves without direct supervision of a healthcare professional. One such example is the choice of facility for acute care, prototypically between a fully equipped emergency care department (ED) at a hospital and a more convenient but less capable urgent care (UC) or retail clinic. We model a strategic patient making this decision taking into account the limited medical information and convenience factors that affect the patient's decision. This model is then used to inform the pricing decision made by the manager of the UC. We show that a separating equilibrium, in which all patients self-triaged as noncritical choose to go to the UC first, dominates pooling equilibria for moderate error rates in self-triage. We analyze the separating equilibrium to examine the effect of consumer health information (CHI) systems, and show that as the quality of the CHI decreases and the error rates go up, the co-pay for an UC decreases, the facility is smaller, and makes less profit.

SSRN Electronic Journal, 2000

Decision Support Systems, 2011

Motivated by a case study at a radiology practice, we analyze the incremental benefits of RFID te... more Motivated by a case study at a radiology practice, we analyze the incremental benefits of RFID technology over barcodes for managing pharmaceutical inventories. Unlike barcode technology, RFID enables accurate real-time visibility, which in turn enables several process improvements. We analyze the impact of automatic counting and discuss the system redesign critical to optimizing the inventory policy and eliminating shrinkage. We

RFID provides real-time tracking, resulting in two additional benefits as an information technolo... more RFID provides real-time tracking, resulting in two additional benefits as an information technology. When inventory is inaccurate and real-time tracking is not available organizations have to use a periodic review policy. When inventory is accurate and realtime tracking is available, they may switch to a continuous review policy. Based on a case study in a radiology practice, we compare the operational and economic differences between a system that uses barcode technology and periodic review, and one that uses RFID technology and continuous review. While the first switch from barcode to RFID is a technology improvement providing automatic counting, the second switch from periodic to continuous review is a process innovation. We measure the value of automatic counting, process innovation, and the total of the two, (the value of RFID). We also explain how these benefits change with service level, lead time, demand, etc.

Social Science Research Network, 2023

Operations Research Letters

SSRN Electronic Journal, 2021

Decision Sciences, 2019

In hospitals, replenishment order information for medical items go through multiple departments b... more In hospitals, replenishment order information for medical items go through multiple departments before it is submitted to the medical supplier. At times, order information is inadvertently lost on the way, leading to order loss. In this article, using our case study conducted at magnetic resonance imaging (MRI) units of a hospital, we propose a periodic review base stock inventory policy that takes order loss into account. Our proposed inventory policy helps in two respects. It provides insights about how to mitigate order loss and establishes a minimum inventory cost benchmark for hospitals so they can readily conduct incremental cost-benefit analysis before implementing a process improvement. We find that more frequent order losses do not necessarily lead to higher base stock levels. The review period plays a key role. We empirically find that, even when order loss is rare, the inventory costs go up appreciably. Hence, we also quantify the potential benefits of two technology features to improve a hospital's ordering process: computerized order entry and transfer (COET), which may eliminate order loss, and real-time item tracking (RTIT), which reduces inventory costs further via continuous review of inventory. Our results indicate that savings by our proposed inventory policy or the two technology features are greatly increased at high service levels, percentage of time in stock, which is true for many hospitals.[

Many patients have a choice of a provider for acute care, typically choosing between an Urgent Ca... more Many patients have a choice of a provider for acute care, typically choosing between an Urgent Care facility (UC) or an Emergency Department of a hospital (ED). This choice is made by a patient who is generally not herself a trained medical professional. She is strategic but imperfectly informed in that she weighs all the costs and benefits of this choice, including quality of care, waiting time, co-payments and fees, but can only imperfectly assess the appropriateness of a facility for the perceived needed care. The manager of the UC sets the fee for service in competition with an ED to influence the choice by patients, and takes into account the factors that affect the patient. We show that a separating equilibrium, in which all patients self-triaged as non-critical choose to go to the UC first, dominates pooling equilibria for moderate error rates in self-triage. We analyze the separating equilibrium further and show that the co-pay for an UC decreases, the facility is smaller, a...

Proceedings of the 50th Hawaii International Conference on System Sciences (2017), 2017

Consumer healthcare information plays a critical role in informing patients who participate in or... more Consumer healthcare information plays a critical role in informing patients who participate in or make healthcare decisions for themselves without direct supervision of a healthcare professional. One such example is the choice of facility for acute care, prototypically between a fully equipped emergency care department (ED) at a hospital and a more convenient but less capable urgent care (UC) or retail clinic. We model a strategic patient making this decision taking into account the limited medical information and convenience factors that affect the patient's decision. This model is then used to inform the pricing decision made by the manager of the UC. We show that a separating equilibrium, in which all patients self-triaged as noncritical choose to go to the UC first, dominates pooling equilibria for moderate error rates in self-triage. We analyze the separating equilibrium to examine the effect of consumer health information (CHI) systems, and show that as the quality of the CHI decreases and the error rates go up, the co-pay for an UC decreases, the facility is smaller, and makes less profit.

SSRN Electronic Journal, 2000

Decision Support Systems, 2011

Motivated by a case study at a radiology practice, we analyze the incremental benefits of RFID te... more Motivated by a case study at a radiology practice, we analyze the incremental benefits of RFID technology over barcodes for managing pharmaceutical inventories. Unlike barcode technology, RFID enables accurate real-time visibility, which in turn enables several process improvements. We analyze the impact of automatic counting and discuss the system redesign critical to optimizing the inventory policy and eliminating shrinkage. We

RFID provides real-time tracking, resulting in two additional benefits as an information technolo... more RFID provides real-time tracking, resulting in two additional benefits as an information technology. When inventory is inaccurate and real-time tracking is not available organizations have to use a periodic review policy. When inventory is accurate and realtime tracking is available, they may switch to a continuous review policy. Based on a case study in a radiology practice, we compare the operational and economic differences between a system that uses barcode technology and periodic review, and one that uses RFID technology and continuous review. While the first switch from barcode to RFID is a technology improvement providing automatic counting, the second switch from periodic to continuous review is a process innovation. We measure the value of automatic counting, process innovation, and the total of the two, (the value of RFID). We also explain how these benefits change with service level, lead time, demand, etc.