Browsing by Author "Duman, Ekrem"
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Application of sequence-dependent traveling salesman problem in printed circuit board assembly
Alkaya, A. F.; Duman, Ekrem (IEEE, 2013-06)Optimization issues regarding the automated assembly of printed circuit boards attracted the interest of researchers for several decades. This is because even small gains in assembly time result in very important benefits ... -
Applying migrating birds optimization to credit card fraud detection
Elikucuk, I.; Duman, Ekrem (Springer Science+Business Media, 2013)We discuss how the Migrating Birds Optimization algorithm (MBO) is applied to statistical credit card fraud detection problem. MBO is a recently proposed metaheuristic algorithm which is inspired by the V flight formation ... -
Benchmarking regression algorithms for income prediction modeling
Kibekbaev, Azamat; Duman, Ekrem (Elsevier, 2016)This paper aims to predict incomes of customers for banks. In this large-scale income prediction benchmarking paper, we study the performance of various state-of-the-art regression algorithms (e.g. ordinary least squares ... -
Benchmarking regression algorithms for income prediction modeling
Kibekbaev, Azamat; Duman, Ekrem (IEEE, 2015)This paper aims to predict incomes of customers for banks. In this large-scale income prediction benchmarking paper, we study the performance of various state-of-the-art regression algorithms (e.g. ordinary least squares ... -
Classification of hundreds of classes: A case study in a bank internal control department
Duman, Ekrem (IOS Press, 2023)The main function of the internal control department of a bank is to inspect the banking operations to see if they are performed in accordance with the regulations and bank policies. To accomplish this, they pick up a ... -
Combining and solving sequence dependent traveling salesman and quadratic assignment problems in PCB assembly
Alkaya, A. F.; Duman, Ekrem (Elsevier, 2015-09-10)In this study we undertake the optimization of chip shooter component placement machines which became popular in assembling printed circuit boards (PCB) in recent years. A PCB is usually a rectangular plastic board on which ... -
Comparison of computational intelligence models on forecasting automated teller machine cash demands
Alkaya, A. F.; Gultekin, O. G.; Danaci, E.; Duman, Ekrem (Old City Publishing, 2020)We take up the problem of forecasting the amount of money to be withdrawn from automated teller machines (ATM). We compare the performances of eleven different algorithms from four different research areas on two different ... -
A cost-sensitive decision tree approach for fraud detection
Sahin, Y.; Bulkan, S.; Duman, Ekrem (Elsevier, 2013-11-01)With the developments in the information technology, fraud is spreading all over the world, resulting in huge financial losses. Though fraud prevention mechanisms such as CHIP&PIN are developed for credit card systems, ... -
Deep reinforcement learning approach for trading automation in the stock market
Deep Reinforcement Learning (DRL) algorithms can scale to previously intractable problems. The automation of profit generation in the stock market is possible using DRL, by combining the financial assets price "prediction" ... -
Deep reinforcement learning approach for trading automation in the stock market
Kabbani, Taylan; Duman, Ekrem (IEEE, 2022)Deep Reinforcement Learning (DRL) algorithms can scale to previously intractable problems. The automation of profit generation in the stock market is possible using DRL, by combining the financial assets price 'prediction' ... -
Design and implementation of a data stream management system with advanced complex event processing capabilities
Ölmezoğulları, Erdi (2013-06)The world has seen proliferation of data stream applications over the last years. These applications include computer network monitoring, Radio Frequency Identication (RFID)-based supply chain and traffic management systems, ... -
Detecting credit card fraud by modified Fisher discriminant analysis
Mahmoudi, Nader; Duman, Ekrem (Elsevier, 01.04.2015)In parallel to the increase in the number of credit card transactions, the financial losses due to fraud have also increased. Thus, the popularity of credit card fraud detection has been increased both for academicians and ... -
An extension to the classical mean–variance portfolio optimization model
Ötken, Çelen Naz; Organ, Zeynel Batuhan; Yıldırım, Elif Ceren; Çamlıca, Mustafa; Cantürk, Volkan Selim; Duman, Ekrem; Teksan, Zehra Melis; Kayış, Enis (Taylor & Francis, 2019-07)The purpose of this study is to find a portfolio that maximizes the risk-adjusted returns subject to constraints frequently faced during portfolio management by extending the classical Markowitz mean-variance portfolio ... -
Intelligent classification-based methods in customer profitability modeling
Ekinci, Y.; Duman, Ekrem (Springer International Publishing, 2015)The expected profits from customers are important informations for the companies in giving acquisition/retention decisions and developing different strategies for different customer segments. Most of these decisions can ... -
Migrating birds optimization: a new metaheuristic approach and its performance on quadratic assignment problem
Duman, Ekrem; Uysal, M.; Alkaya, A. F. (Elsevier, 2012-12-25)We propose a new nature inspired metaheuristic approach based on the V flight formation of the migrating birds which is proven to be an effective formation in energy saving. Its performance is tested on quadratic assignment ... -
A new application of the traveling salesman problem: The Turkish cashier problem
Duman, Ekrem (Ministry Communications & High Technologies Republic Azerbaijan, 2022)We define the problem of finding a route for the cashier that minimizes the cost of transportation as the Turkish Cashier Problem (TCP). It is a special case of the well-known traveling salesman problem. To solve the TCP, ... -
A novel and successful credit card fraud detection system Implemented in a Turkish Bank
Duman, Ekrem; Buyukkaya, A.; Elikucuk, I. (IEEE, 2013)We developed a credit card fraud detection solution for a major bank in Turkey. The study was completed in about three years and the developed system has been in use since February 2013. It had a great impact in the rule ... -
A novel collection optimisation solution maximising long-term profits: a case study in an international bank
Duman, Ekrem; Ecevit, F.; Çakır, Ç.; Altan, O. (Taylor & Francis, 2017-10-02)When customers fail to pay the amount they owe to their bank related with a credit product (credit cards, overdraft accounts or instalment loans), the bank starts the collection process. This process typically lasts for a ... -
Optimal ATM replenishment policies under demand uncertainty
Ekinci, Y.; Serban, N.; Duman, Ekrem (Springer Nature, 2021-06)The use of Automated Teller Machines (ATMs) has become increasingly popular throughout the world due to the widespread adoption of electronic financial transactions and better access to financial services in many countries. ... -
Optimization of ATM cash replenishment with group-demand forecasts
Ekinci, Y.; Lu, J.-C.; Duman, Ekrem (Elsevier, 2015-05-01)In ATM cash replenishment banks want to use less resources (e.g., cash kept in ATMs, trucks for loading cash) for meeting fluctuated customer demands. Traditionally, forecasting procedures such as exponentially weighted ...
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