Browsing by Author "Yanıkoğlu, İhsan"
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An adaptive large neighborhood search for the multi-compartment inventory routing problem
Gültekin, Ceren (2021-06-10)In this thesis study, we concentrate on an inventory routing problem with a fleet of multi-compartment vehicles which enables the distribution of different products to customers on a delivery route. Using separate compartments ... -
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 ... -
A decomposition-based metaheuristic approach for solving the rapid needs assessment routing problem
Mıhçıoğlu, Yurtsev (2021-01-18)This study proposes a decomposition-based tabu search algorithm for a multi-cover routing problem (MCRP), which aims to classify and evaluate the impacts of the disaster in different sites and the needs of different community ... -
Economic lot sizing problem with tank scheduling
Dereli, Meryem Merve (2021-08)In this study, we consider an Economic Lot sizing Problem with Tank Scheduling (ELSTS). The problem is a real-world problem, which is generally found in fermented beverage and food facilities. A facility might produce an ... -
An exact approach to maximize area under receiver operator characteristic curve for multi-instance learning
Atasoy, Gizem (2018-08)The purpose of this study is to solve the multi-instance classi cation problem by directly maximizing the area under Receiver Operating Characteristic (ROC) curve (i.e., AUC). We derive a mixed integer linear programming ... -
Heuristic approaches for assembly line balancing and competent worker assignment problem (ALWABP)
Çengil, Muhammet Fatih (2018-01)In this study, we focus on assembly line balancing and worker assignment problem, where multiple production lines are executed by a shared pool of workers with varying skills and having absenteeism issues. We developed two ... -
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 mathematical model for customer lifetime value based offer management
Can, Zehra (2018-01)Customers with prepaid lines possess higher attrition risk compared to postpaid customers since prepaid customers do not sign long-term obligatory contracts and may churn anytime. For this reason, mobile operators have to ... -
A mathematical modelling approach for dled TV panel design
Kurt, Olkan (2019-06)The aim of this study is to increase the luminance performance of direct light emitting diodes (DLED) televisions through case design improvement. We first gather luminance measurements of several regions of active area ... -
Minimizing warpage using taguchian methodology and robust optimization
Okçuoğlu, Serkan (2018-04)Injection moulding, which is considered to be one of the most efficient plastic raw material processing methods in plastic industry regarding to its high production rate when manufacturing parts with complex geometries are ... -
Multi-compartment inventory routing problem with adjustable compartment sizes
Ölmez, Ömer Berk (2021-06-10)In this study, we focus on a problem where the supplier manages the customers’ in ventories and coordinates the distribution of multiple products to customers. Hereby the supplier can minimize the transportation costs by ... -
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 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 ... -
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, 2020)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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