Özpeynirci, Selin
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Bilgin Özpeynirci, Selin
Ozpeynirci, Selin
Bilgin, Selin
Bilgin Ozpeynirci, Selin
Ozpeynirci, Selin
Bilgin, Selin
Bilgin Ozpeynirci, Selin
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selin.ozpeynirci@ieu.edu.tr
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05.09. Industrial Engineering
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9
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14
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1
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17
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4
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1
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11
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16
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Documents
31
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417
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25
Citations
331
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41
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24
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20/745
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WoS Citation Count
330
Scopus Citation Count
371
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11
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0
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2
WoS Citations per Publication
8.05
Scopus Citations per Publication
9.05
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14
Supervised Theses
11
| Journal | Count |
|---|---|
| Computers & Operatıons Research | 4 |
| Internatıonal Journal of Advanced Manufacturıng Technology | 2 |
| Annals of Operatıons Research | 2 |
| Internatıonal Journal of Productıon Research | 2 |
| Computers and Operations Research | 1 |
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Master Thesis Ekipman Ataması ile İki Amaçlı Montaj Hattı Yeniden Dengeleme Problemi(İzmir Ekonomi Üniversitesi, 2018) Şimşek, Elif; Özpeynirci, SelinBu tezde, ekipman ataması ile iki amaçlı montaj hattı yeniden dengeleme problemi ele alınmıştır. Elimizde gerekli ekipmanla birlikte istasyonlara atanmış işler ve dengelenmiş bir montaj hattı bulunmaktadır. Bir veya daha fazla istasyonda meydana gelen bozulma elimizdeki sonucu kullanılamaz hale getirir. İşlerin gerekli ekipmanla birlikte kalan istasyonlara yeniden atanması gerekmektedir. Eğer işlerin atandığı istasyonlarda gerekli ekipman yer almıyorsa yeni ekipman satın almamız gerekmektedir. Montaj hattını yeniden dengelerken iki amacımız vardır: çevrim süresini en azlamak ve yeni alınan ekipmanın maliyetini en azlamak. Bu çalışmanın amacı bastırılmamış çözümleri yaratmak ve en çok tercih edilen çözümü bulmaktır. İki yöntem kullanılarak tüm bastırılmamış çözümler yaratılmıştır: Geleneksel Epsilon-Kısıt Yöntemi ve Artırılmış Epsilon-Kısıt Yöntemi. Yaratılan çözümler arasından en çok tercih edilen çözümü bulmak için karar verici ile etkileşimli olarak çalışan bir algoritma kullanılmıştır. Önerilen yöntemlerin performanslarını ölçmek amacıyla deneyler yapılmış ve sonuçlar raporlanmıştır.Master Thesis The Contribution of Work Stress To Firms' Efficiency: Data Envelopment Analysis Based Psychometric Case Study(İzmir Ekonomi Üniversitesi, 2022) Öztürk, Onur Arın; Özpeynirci, SelinVerimli ve optimal üretim sektör gözetmeksizin bütün firmaların ortak hedefidir. Verimlilik ve üretkenlik dinamiği çok fazla olan değişkenlerdir. İnsanın olduğu her alan gibi verimlilik ve üretkenlik de dolaylı yoldan çalışan performansına bağlıdır. İş verimliliğini etkileyebilecek insan kaynaklı en temel unsur stres olarak görülmektedir. Araştırmalar, stresin insan üzerinde zihinsel olduğu kadar fiziksel etkileri olduğunu da göstermektedir. Bu çalışmanın amacı stresin insanlar üzerindeki dolaylı etkilerini incelemek ve üretim sektöründe çalışanların iş kaynaklı yaşadıkları stresin verimlilik ve üretkenliğe dolaylı etkilerini gözlemlemektir. Veri Zarflama Analizi ve Madde Tepki Kuramı ile Türkiye'de bulunan iki ayrı üretim fabrikasının çalışanları üzerinde yapılan anket uygulaması ve verimlilik analizleri stresin sadece çalışanların değil aynı zamanda firmanın verimliliğine de zarar verdiğini göstermiştir.Article Citation - WoS: 5Citation - Scopus: 6An Interactive Approach for Inverse Multiple Criteria Sorting Problem(Wiley, 2021) Özpeynirci, Özgür; Özpeynirci, Selin; Mousseau, VincentMultiple criteria sorting is the problem of assigning objects that are evaluated on multiple criteria to ordered classes. In inverse multiple criteria sorting problem, the assignment of objects to classes is known. The decision maker (DM) can implement actions to improve the scores of objects on criteria, thus enabling the assignment of objects to better classes. In inverse multiple criteria sorting problems, two types of questions arise: (1) What is the set of actions that will result in the desired classification with minimum cost? and 2) What is the set of actions to obtain the best classification without exceeding a predetermined budget? There exist two versions for each question: (i) Simple version, where the parameters of the sorting method are known and (ii) Robust version, where the parameters are not fully known. In this article, we focus on the case where the DM does not provide any budget limitation or desired classifications a priori. By implementing more actions, that is, by spending more money, better classifications may be obtained. We aim to analyse the trade-off between cost and classification, and determine the set of actions that will result in the most preferred cost-classification compromise by the DM. We develop an approach that proceeds interactively with the DM, and determines such most preferred set of actions. The developed approach assumes the simple version and uses MR-Sort as sorting model. We provide a detailed illustrative example on a real life problem and present the progress of the interactive algorithm.Article Citation - WoS: 2Citation - Scopus: 3A Lagrangean Relaxation Based Approach for the Capacity Allocation Problem in Flexible Manufacturing Systems(Taylor & Francis Ltd, 2010) Özpeynirci, Selin; Azizoglu, M.This study considers the operation assignment and capacity allocation problem in flexible manufacturing systems. A set of operations is selected to be processed and assigned to the machines together with their required tools. The purchase or usage of the required tools incurs a cost. The machines have scarce time and tool magazine capacities. The objective is to maximize the total weight of the assigned operations minus the total tooling costs. We use Lagrangean relaxation approach to obtain upper and lower bounds on the optimal objective function values. The computational experiments show that our approach provides near optimal bounds in reasonable solution times. Journal of the Operational Research Society (2010) 61, 872-877. doi:10.1057/jors.2009.19Master Thesis Multi-Objective Shipment Consolidation and Dispatching Problem(İzmir Ekonomi Üniversitesi, 2022) Büyükdeveci, Özge; Özpeynirci, Selin; Özpeynirci, Nail ÖzgürSon yıllarda, küresel üretim ve talebin artmasıyla birlikte, ulaşım sorunları, yüksek kaliteli hizmeti en düşük maliyetle sunmak için yaygın olarak çalışılan bir alan haline gelmiştir. Bu tezde, amaçlarından birinin toplam maliyeti en aza indirmek ve diğerinin toplam mesafeyi en aza indirmek olduğu iki amaçlı bir yük birleştirme ve sevkiyat problemi ele alınmıştır. Domine edilemeyen sonuçlar kümesi oluşturmak için, çok amaçlı karma tamsayılı dogrusal programlama modeli önerilmiş ve etkin sınırı oluşturmak için modifiye edilmiş ?-kısıt yöntemi kullanılmıştır. Ancak bu yaklaşım, küçük boyutlu örnekler için bile makul bir sürede bir domine edilemeyen sonuçlar kümesi bulamadığı için, çok amaçlı değişken komşuluk arama sezgisel yöntemi önerilmiştir. Önerilen yaklaşımın performansını ölçmek için literatürde yer alan rassal olarak üretilmiş örnekler ile bir hesaplamalı deney gerçekleştirilmiştir. Deneysel sonuçlar, çok amaçlı degişken komşuluk arama sezgisel yönteminin verimli bir şekilde çalıştıgını ve hesaplama süresinin makul olduğunu göstermektedir. ˆArticle Citation - WoS: 12Multi-Criteria Sorting With Category Size Restrictions(World Scientific Publ Co Pte Ltd, 2017) Koksalan, Murat; Mousseau, Vincent; Özpeynirci, SelinWe consider the multi-criteria sorting problem where alternatives that are evaluated on multiple criteria are assigned into ordered categories. We focus on the sorting problem with category size restrictions, where the decision maker (DM) may have some concerns or constraints on the number of alternatives that should be assigned to some of the categories. We develop an approach based on the UTADIS method that fits an additive utility function to represent the decision maker's preferences. We introduce additional variables and constraints to enforce the restrictions on the sizes of categories. The new formulation reduces the number of binary variables and hence decreases the computational effort compared to the existing approaches in the literature. We further improve the computational efficiency by developing lower and upper bounds on the rank of each alternative in order to narrow down the set of categories that each alternative can be assigned to. We demonstrate our approach on two applications from practice.Article Citation - WoS: 11Citation - Scopus: 14An Interactive Approach for Multiple Criteria Selection Problem(Pergamon-Elsevier Science Ltd, 2017) Özpeynirci, Özgür; Özpeynirci, Selin; Kaya, AnilIn this study, we develop an interactive algorithm for the multiple criteria selection problem that aims to find the most preferred alternative among a set of known alternatives evaluated on multiple criteria. We assume the decision maker (DM) has a quasi-concave value function that represents his/her preferences. The interactive algorithm selects the pairs of alternatives to be asked to the DM based on the estimated likelihood that one alternative is preferred to another. After the DM selects the preferred alternative, a convex cone is generated based on this preference information and the alternatives dominated by the cone are eliminated. Then, the algorithm updates the likelihood information for the unselected pairwise questions. The aim of the algorithm is to detect the most preferred alternative by performing as few pairwise comparisons as possible. We present the algorithm on an illustrative example problem. We also develop a mathematical model that finds the minimum number of questions that can be asked to the DM to determine the most preferred alternative under perfect information. We use the minimum number of questions to develop strategies for interactive algorithm and measure its performance. (C) 2016 Elsevier Ltd. All rights reserved.Article Citation - WoS: 48Citation - Scopus: 58Parallel Machine Scheduling With Tool Loading: a Constraint Programming Approach(Taylor & Francis Ltd, 2018) Gokgur, Burak; Hnich, Brahim; Özpeynirci, SelinThis paper presents constraint programming models that aim to solve scheduling and tool assignment problems in parallel machine environments. There are a number of jobs to be processed on parallel machines. Each job requires a set of tools, but limited number of tools are available in the system due to economic restrictions. The problem is to assign the jobs and the required tools to machines and to determine the schedule so that the makespan is minimised. Three constraint programming models are developed and compared with existing methods described in the literature.Article Citation - WoS: 33Citation - Scopus: 40A New Outranking-Based Approach for Assigning Alternatives To Ordered Classes(John Wiley & Sons Inc, 2009) Koksalan, Murat; Mousseau, Vincent; Özpeynirci, Özgür; Özpeynirci, SelinWe consider the problem of assigning alternatives evaluated on several criteria into ordered categories C(1), C(2), ..., C(p). This problem is known as the multi-criteria sorting problem and arises in many situations such as classifying countries into different risk levels based on economical and socio-political criteria, evaluating credit applications of bank customers. We are interested in sorting methods that are grounded on the construction Of Outranking relations. Among these, the Electre Tri method requires defining multidimensional profiles that represent the frontier separating consecutive categories C(h) and C(h+1). and assigns an alternative to categories according to how it compares to each of the profiles. The explicit specification of the profiles of consecutive categories can be difficult for decision makers. We develop a new Outranking based sorting method that does not require the explicit definition of profiles. We instead require the decision maker to assign a Subset of reference alternatives to the categories. To assign the remaining alternatives. each such alternative is compared to reference alternatives, and assigned to categories accordingly. (C) 2008 Wiley Periodicals, Inc. Naval Research Logistics 56: 74-85, 2009Article Citation - WoS: 19Citation - Scopus: 22A Heuristic Approach Based on Time-Indexed Modelling for Scheduling and Tool Loading in Flexible Manufacturing Systems(Springer London Ltd, 2015) Özpeynirci, SelinIn this paper, we simultaneously consider the scheduling and tool loading problems in flexible manufacturing systems. There are various jobs that must be processed on a number of parallel computer numerical control machines. The processing of each job requires a set of machine tools. However, the number of tool copies available in the system is limited due to economic restrictions. The problem, therefore, is to schedule the jobs and the required tools in such a way that the makespan is minimized. We present a time-indexed mathematical model of the problem. A heuristic approach based on the mathematical model is also developed and the computational results are presented. The goal of this study is to develop a new approach for simultaneously scheduling the jobs and loading the tools in flexible manufacturing systems and benefit from the advantages of time-indexed modelling.