Işık Yazarı "Özgür Ünlüakın, Demet" Endüstri Mühendisliği Bölümü / Department of Industrial Engineering İçin Listeleme
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Cost-effective fault diagnosis of a multi-component dynamic system under corrective maintenance
Özgür Ünlüakın, Demet; Türkali, Busenur; Aksezer, Sezgin Çağlar (Elsevier Ltd, 2021-04)Maintenance planning and execution are challenging tasks for every system with complex structure. Interdependent nature of the components that builds up the system may have significant effect on system integrity. While ... -
A DBN based reactive maintenance model for a complex system in thermal power plants
Özgür Ünlüakın, Demet; Türkali, Busenur; Karacaörenli, Ayşe; Aksezer, Sezgin Çağlar (Elsevier Sci Ltd, 2019-10)Thermal power plants consist of several complex systems having many interacting hidden components. Any unexpected failure may lead to prolonged downtime and serious lost profits. Therefore, implementing an effective ... -
Developing an effective maintenance policy for control gates in hydroelectric power plants
Aktel, Mehmet Burak; Özgür Ünlüakın, Demet (IEOM Society, 2018)Energy consumption has been increasing rapidly in the world. That is why production of energy from renewable resources is getting more and more important today. Hydroelectric power is the largest source of renewable ... -
An effective maintenance policy for a multi-component dynamic system using factored POMDPs
Kıvanç, İpek; Özgür Ünlüakın, Demet (Springer Verlag, 2019-09-20)With the latest advances in technology, almost all systems are getting substantially more uncertain and complex. Since increased complexity costs more, it is challenging to cope with this situation. Maintenance optimization ... -
Evaluation of proactive maintenance policies on a stochastically dependent hidden multi-component system using DBNs
Özgür Ünlüakın, Demet; Türkali, Busenur (Elsevier Ltd, 2021-07)In complex systems with stochastically dependent components which are not observed directly, determining an effective maintenance policy is a difficult task. In this paper, a dynamic Bayesian network based maintenance ... -
Maintenance policy analysis of the regenerative air heater system using factored POMDPs
Kıvanç, İpek; Özgür Ünlüakın, Demet; Bilgiç, Taner (Elsevier Ltd, 2022-03)Maintenance optimization of multi-component systems is a difficult problem. Partially Observable Markov Decision Processes (POMDPs) are powerful tools for such problems under uncertainty in stochastic environments. In this ... -
Maintenance policy simulation for a factored partially observable system
Özgür Ünlüakın, Demet; Kıvanç, İpek (The Society for Modeling and Simulation International, 2019-07)Taking maintenance decisions is one of the well-known stochastic sequential decision problems under uncertainty. Partially Observable Markov Decision Processes (POMDPs) are powerful tools for such problems. Nevertheless, ... -
Performance analysis of an aggregation and disaggregation solution procedure to obtain a maintenance plan for a partially observable multi-component system
Özgür Ünlüakın, Demet; Bilgiç, Taner (Elsevier Sci Ltd, 2017-11)We analyze the performance of an aggregation and disaggregation procedure in giving the optimal maintenance decisions for a multi-component system under partial observations in a finite horizon. The components deteriorate ...