Browsing Faculty of Engineering by OzU Authors "Yanıkoğlu, İhsan"
Now showing items 1-14 of 14
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Branch-and-price approach for robust parallel machine scheduling with sequence-dependent setup times
Yanıkoğlu, İhsan; Yavuz, Tonguç (Elsevier, 2022-09-16)This paper studies a machine scheduling problem that minimizes the worst-case total tardiness for unrelated parallel machines with sequence-dependent setup and uncertain processing times. We propose a robust optimization ... -
Capacitated stochastic lot-sizing and production planning problem under demand uncertainty
Seyfishishavan, Seyed Amin; Yılmaz, Görkem; Yanıkoğlu, İhsan (Elsevier, 2022)This paper proposes two multi-period, multi-item capacitated stochastic lot-sizing problems under demand uncertainty. We model uncertainty via a scenario tree. The first model considers production, inventory, backlogging, ... -
Decision rule bounds for two-stage stochastic bilevel programs
Yanıkoğlu, İhsan; Kuhn, D. (Society for Industrial and Applied Mathematics Publications, 2018)We study two-stage stochastic bilevel programs where the leader chooses a binary here-and-now decision and the follower responds with a continuous wait-and-see decision. Using modern decision rule approximations, we construct ... -
Humanitarian relief distribution problem: an adjustable robust optimization approach
Avishan, Farzad; Elyasi, Milad; Yanıkoğlu, İhsan; Ekici, Ali; Özener, Okan Örsan (Informs, 2023-03-23)Management of humanitarian logistics operations is one of the most critical planning problems to be addressed immediately after a disaster. The response phase covers the first 12 hours after the disaster and is prone to ... -
Load dependent lead time modelling: a robust optimization approach
Albey, Erinç; Yanıkoğlu, İhsan; Uzsoy, R. (IEEE, 2018-01-04)Although production planning models using nonlinear CFs have shown promising results for semiconductor wafer fabrication facilities, the lack of an effective methodology for estimating the CFs is a significant obstacle to ... -
A practical guide to robust optimization
Gorissen, B. L.; Yanıkoğlu, İhsan; Hertog, D. den (Elsevier, 2015-06)Robust optimization is a young and active research field that has been mainly developed in the last 15 years. Robust optimization is very useful for practice, since it is tailored to the information at hand, and it leads ... -
Robust dual response optimization
Yanıkoğlu, İhsan; Hertog, D. den; Kleijnen, J. P. C. (Taylor & Francis, 2016)This article presents a robust optimization reformulation of the dual response problem developed in response surface methodology. The dual response approach fits separate models for the mean and the variance, and analyzes ... -
A robust optimization approach for humanitarian needs assessment planning under travel time uncertainty
Koyuncu, Burcu Balçık; Yanıkoğlu, İhsan (Elsevier, 2020-04-01)We focus on rapid needs assessment operations conducted immediately after a disaster to identify the urgent needs of the affected community groups, and address the problem of selecting the sites to be visited by the ... -
A robust optimization approach for production planning under exogenous planned lead times
Albey, Erinç; Yanıkoğlu, İhsan; Uzsoy, R. (IEEE, 2019)Many production planning models applied in semiconductor manufacturing represent lead times as fixed exogenous parameters. However, in reality, lead times must be treated as realizations of released lots' cycle times, which ... -
Robust parameter design and optimization for quality engineering
Yanıkoğlu, İhsan; Albey, Erinç; Okçuoğlu, S. (Springer, 2022-03)This paper proposes a methodology to determine the optimal settings of key decision variables that affect the resilience of an engineering design against uncertainty. Uncertainty in quality engineering is often caused by ... -
Robust strategic planning of dynamic wireless charging infrastructure for electric buses
Alwesabi, Y.; Avishan, Farzad; Yanıkoğlu, İhsan; Liu, Z.; Wang, Y. (Elsevier, 2022-02-01)Electromobility in public bus systems is growing rapidly and experiencing a fundamental transformation in their infrastructure and operations. The dilemma of limited driving range and charging time of battery electric buses ... -
Stochastic production planning with flexible manufacturing systems and uncertain demand: A column generation-based approach
Elyasi, Milad; Özener, Başak Altan; Ekici, Ali; Özener, Okan Örsan; Yanıkoğlu, İhsan (Elsevier, 2022)The ongoing pandemic, namely COVID-19, has rendered widespread economic disorder. The deficiencies have delayed production at manufacturers in several industries on the supply side. The effects of disruption were more ... -
A survey of adjustable robust optimization
Yanıkoğlu, İhsan; Gorissen, B. L.; Hertog, D. den (Elsevier, 2019-09)Static robust optimization (RO) is a methodology to solve mathematical optimization problems with uncertain data. The objective of static RO is to find solutions that are immune to all perturbations of the data in a so-called ... -
The value of quality grading in remanufacturing under quality level uncertainty
Yanıkoğlu, İhsan; Denizel, M. (Taylor & Francis, 2021)In remanufacturing, variability in quality levels of available cores (end-of-life products) has an impact on both the process cost and the process time. While previous research suggests that quality grading adds value, ...
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