Browsing by Author "Yanıkoğlu, İhsan"
Now showing items 21-39 of 39
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Multi-stage scenario-based stochastic programming for managing lot sizing and workforce scheduling at Vestel
Seyfishishavan, Seyed Amin; Yanıkoğlu, İhsan; Yılmaz, G. (Springer, 2023-12)This study proposes a multi-stage stochastic production planning approach for a joint lot sizing and workforce scheduling problem under demand uncertainty. Scenario trees are used to model uncertainty in demand, and a ... -
A multistage scenario optimization procedure for capacity planning in TV production final assembly lines
Vestel Electronics is a large-scale TV producer that has an important share in the European television market. High End Factory, where Vestel assembles 20 different TVs in size, consists of 14 final assembly lines. High ... -
Neural network estimatorsfor optimal tour lengths of TSP instances with arbitrary node distributions
To achieve operational efficiency in logistics, we need to solve complex routing problems. Due to their complexity, these problems are often solved sequentially, i.e., using cluster-first route-second (CFRS) type frameworks. ... -
Nonidentical parallel machine scheduling with time-dependent deterioration of jobs
We consider scheduling of deteriorating jobs on nonidentical parallel machines where the objective is to minimize mean flow time while ensuring the average value (i.e., quality) of processed jobs on machines exceeds a ... -
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 ... -
Reducing open vial wastage with lateral transshipment in COVID-19 vaccine administration
After the discovery and production of vaccines for the immunization against COVID-19 pandemic, mass vaccination programs are launched across the world. One of the main challenges faced during the COVID-19 mass vaccination ... -
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 reformulations of ambiguous chance constraints with discrete probability distributions
Yanıkoğlu, İhsan (Balikesir University, 2019)This paper proposes robust reformulations of ambiguous chance constraints when the underlying family of distributions is discrete and supported in a so-called ``p-box'' or ``p-ellipsoidal'' uncertainty set. Using the robust ... -
Robust scheduling for parallel machines with sequence dependent setup times and uncertain breakdowns
Top, Ayşenur Betül (2017-08)In this study, machine scheduling activities in the plastic injection production facility of a company competing in electronic sector is investigated. The company designs the products and picks order from customers for ... -
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 ... -
Scheduling and routing of chronic dialysis patients in the aftermath of a disaster
Disasters have devastating effects on patients with chronic diseases who need regular treatments to preserve their health. In this thesis, we focus on developing effective, fast and joint solution methodologies to support ... -
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 ... -
A syncronized routing problem for restoring inter-dependent infrastructure networks
Sevindik, Büşra (2018-05)Disasters may cause significant damages in lifeline infrastructure systems (such as gas, power, water) and lead to long-lasting failures. It is important to repair the damaged components and restore the affected infrastructures ... -
Transportation planning for the relief items distribution during an emergency
Çankaya, Emre (2017-01)We study the inventory slack routing problem (ISRP) to improve planning of distribution of the relief supplies, which is a critical issue in emergency preparedness and response. The authority officials construct their ... -
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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