Yusuf Şahin

Yusuf Şahin
Burdur Mehmet Akif Ersoy University · Department of Business

PhD

About

57
Publications
35,022
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241
Citations
Introduction
Yusuf Sahin received an M.S. degree in industrial engineering from Pamukkale University in 2009 and a PhD degree in business administration from Suleyman Demirel University in 2014. He worked as an assistant professor at Burdur Mehmet Akif Ersoy University from 2014 to 2020. He received the title of Associate Professor in November 2020. The field of study includes operations research, logistics, warehouse management, vehicle routing, metaheuristics, and quantitative models.
Additional affiliations
November 2020 - present
Mehmet Akif Ersoy University
Position
  • Professor (Associate)
December 2014 - November 2020
Mehmet Akif Ersoy University
Position
  • Professor (Assistant)
January 2006 - July 2010
Pamukkale University
Position
  • Research Assistant
Education
September 2010 - August 2014
Suleyman Demirel University
Field of study
  • Business Administration
September 2006 - June 2009
Pamukkale University
Field of study
  • Industrial Engineering
September 2000 - June 2005
Yildiz Technical University
Field of study
  • Industrial Engineering

Publications

Publications (57)
Article
Full-text available
This study aims to analyze the performance of countries in the COVID-19 period. The main motivation of the study is to make a more realistic assessment by taking into account the epidemic information and health system-related features, as well as government precaution (Stringency Index) and economic criteria. In this way, the characteristics of the...
Article
Full-text available
A proper CNC machine selection problem is an important issue for manufacturing companies under competitive market conditions. The selection of an improper machine tool can cause many problems such as production capabilities and productivity indicators considering time and money industrially and practically. In this paper, a comprehensive solution a...
Article
Full-text available
Whenever there is sufficient demand, companies generally prefer the full truckload (TL) option for long-distance transport, resulting in large and less frequent shipment operations that can be costly if inventory carrying costs are high. Less than truckload (LTL) is another option for transport when carrying costs are high and/or there is insuffici...
Article
Full-text available
Performance measurements are important motivators in evaluating a company’s strategy. The performance improvement process starts with the measurement of the current situation. Therefore, companies use various metric quantities for the efficiency and productivity of warehouse management. Recently, many studies have been conducted on key performance...
Article
Full-text available
A mixture of two Weibull distributions (WW) has a variety of usage area from reliability analysis to wind speed modeling. Maximum likelihood (ML) method is the most frequently used method in parameter estimation of WW. Due to the nonlinear nature of the log-likelihood function of WW, usage of iterative techniques is a necessary process. Conventiona...
Chapter
Full-text available
Bu çalışmanın amacı küçük ve orta ölçekli firmaların günlük operasyonlarında kullanabilecekleri en iyi ERP yazılımı seçmesinde yardımcı olacak, uzman görüşüne dayalı hibrit karar modelleri önermektir. Literatürdeki çalışmalar incelendiğinde çok kriterli karar yöntemlerinin kullanıldığı birçok çalışma olmakla birlikte bu çalışmada BWM ve SWARA yönte...
Chapter
Full-text available
Bu çalışmada detayları ilerleyen bölümlerde verilen KKO algoritması ile GSP test problem yatağı ele alınmış ve çözülmüştür. Elde edilen çözümler süre ve çözüm kalitesi açısından literatürdeki KKO çözümleri ve başkaca sezgisel algoritmaların çözümleri ile kıyaslanmıştır. Çalışmanın birinci bölümde KKO algoritmasının detayları, ikinci bölümde hesapla...
Article
Full-text available
Purpose: Traveling Salesman Problem (TSP) that can be extended and modified in various ways, is a practical and realistic type of problem and forms the basis for the visual and spatial solution of many optimization problems. In this study, 15, 25 and 35 nodes Travelling Salesman Problems were solved by secondary school, high school and undergraduat...
Article
Full-text available
Renewable energy has become a prominent subject for researchers since fossil fuel reserves have been decreasing and are not promising to meet the energy demand of the future. Wind takes an important place in renewable energy resources and there is extensive research on wind speed modeling. Herein, one of the most commonly used distributions for win...
Article
Full-text available
The Traveling Salesman Problem is the problem of identifying a route that will enable a salesman to visit all the cities only once in the list where the cities are located, to start and to return the city where he lives by traveling the shortest distance. In this study, the solution performances of a series of heuristic and metaheuristic methods in...
Article
Full-text available
Dünya üzerinde oldukça geniş bir alana hızlı bir yayılım gösteren çevre kirliliğine karşı alınabilecek tedbirlerin başında yenilenebilir enerji kaynaklarının enerji üretimin-deki payını arttırmak gelir. Yenilenebilir enerji yatırımla-rının değerlendirilmesi ise teknik, ekonomik, çevresel ve sosyal bir dizi kriterden etkilendiği için karar alması ka...
Article
Full-text available
In this study, procedures are presented that can be used to determine the routes of the packages transported within a modular storage system. The problem is a variant of robot motion planning problem. The structures of the procedures are developed in three steps for the simultaneous movement of multiple unit-sized packages in a modular warehouse. T...
Article
Full-text available
Purpose The purpose of this paper is to investigate the relative influences of technical and functional quality levels of service quality and patient satisfaction. In this context, the healthcare service quality and the factors affecting customer satisfaction were evaluated using the grey relational analysis (GRA) method. Design/methodology/approa...
Article
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Afet sonrası evsiz kalan afetzedelerin barınak ihtiyacı geçici iskân alanlarının kurulmasıyla giderilmektedir. Geçici iskân alanlarının yerinin belirlenmesi afet hazırlık çalışmalarında karar verilmesi gereken önemli bir problemdir. Bugüne kadar yapılan çalışmalarda birçok ayrıntı eklenerek seçim işleminin uygulanabilirliği artırılmaya çalışılmıştı...
Article
Full-text available
Grey Relational Analysis is a research tool used as part of the gray system theory to show the relationship between factors and variables. In many production processes, to ensure customer satisfaction, product specifications are prioritized, then customer requirements are taken into account and improvements are made. In this study, AHP-weighted gra...
Article
Full-text available
Grey Relational Analysis is a research tool used as part of the gray system theory to show the relation-ship between factors and variables. In many produc-tion processes, to ensure customer satisfaction, product specifications are prioritized, then customer requirements are taken into account and improve-ments are made. In this study, AHP - weighte...
Conference Paper
Full-text available
The Traveling Salesman Problem (TSP) is an optimization problem that determines the shortest route to be used by the salesman who will visit a number of cities. TSP, which forms the basis of many optimization problems, is a practical and realistic problem type for visual and spatial solutions. In this study, 15, 25 and 35 nodes TSP problems were so...
Conference Paper
Full-text available
Developing new heuristic and meta-heuristic algorithms to solve NP-Hard problems is a recent research area. In the literature, each newly developed heuristic or meta-heuristic algorithm is tried to put forward by comparing the performance of the new method with the previous studies. In this study, a new evolutionary meta-heuristic algorithm is prop...
Article
Full-text available
The transportation problem is one of the important problems in the field of optimization. It is related to finding the minimum cost transportation plan for moving to a certain number of demand points from a certain number of sources. Various methods for solving this problem have been included in the literature. These methods are usually developed f...
Article
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Gezgin Satıcı Problemi (GSP), bir satıcının bütün şehirleri sadece bir defa ziyaret ederek başlangıç noktasına dönmesini sağlayan en kısa rotanın belirlendiği problemdir. GSP, araç rotalamadan baskılı devre kartı montajına kadar birçok problemin temelini oluşturur. Bu problem, optimizasyon alanında çalışan kişilerden büyük ilgi görmüştür, ancak öze...
Article
Full-text available
Since its inception, Humanity has built houses of different shapes and characteristics. In addition to meeting the housing needs, houses are also considered as a status, social acceptance, and investment tool. Therefore, house purchasing has become one of the most important common living and investment goals for individuals and families. In this st...
Chapter
Full-text available
This chapter presents a new G-VRP model that aims to reduce the fuel consumption of the vehicle’s gas tank. The fuel consumption of a vehicle is related to total vehicle weight through route and thus, this changes the CO2 levels as a result of the changes of total weight and distance for any arc {i, j} in the route. To minimize CO2 levels, a simula...
Article
Full-text available
Turkey is one of leading countries in terms of earthquake risk. The risk map of earthquake in Turkey, which was updated in collaboration with various universities and public institutions in 2017, has indicated clearly that most of the population and the industrial facilities in Turkey are in the areas of earthquake risk. It is observed that the sig...
Article
Full-text available
Wind has become a popular renewable energy resource in last two decades. Modeling of wind speed is a 3 crucial task for investors to estimate the energy potential of a region. The aim of this paper is to compare the popular 4 unimodal wind speed distributions with their two-component mixture forms. Accordingly, Weibull, gamma, normal, 5 lognormal d...
Conference Paper
Full-text available
The vehicle routing problem is basically an integrated problem consisting of a combination of two different optimization problems. The vehicle routing problem that is a popular problem and located in NP-Hard class, is a combination of well-known travelling salesman and bin packing problems. In this study, the actual distributions from the central w...
Conference Paper
Full-text available
The transportation problem (TP) is one of the important problems in the field of operations research. This is an optimization problem that arises especially in the planning of the distribution of goods and services from different sources of supply to a certain number of demand points. The TP concerns the transfer of products from a certain number o...
Conference Paper
Full-text available
A mixture of two Weibull distributions has variety of usage area from reliability analysis to wind speed modelling [1,3]. The existing conventional methods such as Maximum likelihood (ML) and Expectation-Maximization (EM) algorithm for estimating the parameters of the mixture of two Weibull distributions are very sensitive to initial values. In oth...
Conference Paper
Full-text available
Amaç: Bu çalışmada öğrencilerin eğitim geçmişleri ve eğitim süreci/giriş sınav puanları, ailenin gelir düzeyi ve ebeveynlerin durumları ile eğitim düzeyleri gibi demografik verilerin üniversite mezuniyet başarıları üzerindeki etkisi araştırılmıştır. Analizden elde edilecek sonuçlara dayanarak yeni kayıt olmuş ya da eğitimine devam etmekte olan öğre...
Conference Paper
Full-text available
Bu çalışmada, üniversite öğrencilerinin afete hazırlık ve afet bilinci düzeyi tespit edilerek yapılması gereken çalışmalar ile ilgili önerilerin sunulması hedeflenmiştir. Rastgele seçilen farklı bölümlere bağlı sınıflarda toplam 360 adet anket dağıtılmış, dağıtılan anketlerden 345 tanesi cevaplanarak teslim edilmiştir. Anketin ilk kısmında öğrencil...
Conference Paper
Full-text available
Amaç: Bu çalışmada, üç boyutlu mermer kesim problemi ele alınmaktadır. Mermer işletmesine ocaktan gelen farklı ebatlarda mermer bloklar SD (Saw Disc) makinesiyle müşterilerin talep etmiş olduğu ölçülere göre kesilerek plakalar elde edilmektedir. Daha sonra bu plakalar farklı uzunluklarda kesilerek mermer fayanslara dönüştürülmektedir. Mermer blokla...
Conference Paper
Full-text available
Amaç: Bu çalışmada öğrencilerin eğitim geçmişleri ve eğitim süreci/giriş sınav puanları, ailenin gelir düzeyi ve ebeveynlerin durumları ile eğitim düzeyleri gibi demografik verilerin üniversite mezuniyet başarıları üzerindeki etkisi araştırılmıştır. Analizden elde edilecek sonuçlara dayanarak yeni kayıt olmuş ya da eğitimine devam etmekte olan öğr...
Article
Full-text available
Neighborhood representatives (mukhtars) are the nearest units to citizens in local level. It is required to take advantage of that the neighborhood representatives know their districts and residents better than central and local government authorities. In addition, it will be appropriate to the principles of subsidiarity and the European Charter of...
Conference Paper
Full-text available
Natural, technological or man-induced events that have the unpredictability in time, the intensity and the location are called as disaster. Disasters have a serious disruption on the functioning of a society and affect human life negatively due to destruction they create in the region. Existing local resources are often inadequate to remove these e...
Article
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Maritime trade has an important and growing share on the volume of world trade which is increasing nowadays due to globalization and e-commerce. This situation requires ports, the most important elements of maritime trade, to give more efficient and productive service. Although countries have different strategies on port management, they all aim to...
Conference Paper
Full-text available
Küreselleşme ve e-ticaretin etkisiyle dünya ticaret hacminin giderek arttığı günümüzde denizyolu ticaretinin dünya ticaretindeki payı da giderek artmaktadır. Bu durum denizyolu taşımacılığının en önemli parçası olan limanları daha etkin ve verimli bir şekilde hizmet vermeye zorlamaktadır. Liman yönetimi konusunda ülke yönetimlerinin uyguladığı stra...
Conference Paper
Full-text available
Afet riski, belirli bir yerde doğal veya insan kaynaklı etkileşimler neticesinde zararlı sonuçların veya kayıpların (hayat, sağlık, varlık, hizmet vb.) ortaya çıkma olasılığını ifade eder. Risk değerlendirmesi bir aktiviteden ziyade çok disiplinli bir süreçtir. Bir toplum veya topluluğun karşı karşıya kalabileceği tehlikelerin belirlenmesi, ölçülme...
Article
Full-text available
Tedarikçi seçimi, satın alma fonksiyonu içerisinde oldukça önemli bir faaliyettir. Tedarikçi seçiminin başlıca amacı, firmanın süreklilik ve fiyat etkinliği ihtiyaçlarını karşılayan yüksek potansiyelli tedarikçilerin belirlenmesidir. Tedarikçiler konusunda yapılacak doğru tercihler satın alma maliyetlerinin azaltırken, müşteri memnuniyeti ve rekabe...
Article
Full-text available
The vehicle routing problem is a popular NP-Hard class combinatorial optimization problem. Some constraints as capacity and time can be added to the problem to make it compatible with the real life application. It is very difficult to solve this problem for large real-life data sets in polynomial time using exact solution methods. The exact solutio...
Article
Full-text available
Nowadays, the periodic level payment model is the most widely used loan payment model by the banks. In addition, the periodic geometric and linear gradient payment models are available in the financial mathematics books. The arbitrary skip periodic level (or equal) loan payment model was firstly developed by Formato (1992). Formato’s model was exte...
Article
Full-text available
Nowadays one of the most important aims of the companies is to manage warehouse operations effectively. During the management of warehouse operations two types of problems are experienced densely. First one is to define order batches and second one is to determine a suitable vehicle route for batched orders. In order to prepare effective and econom...
Article
Full-text available
Nowadays one of the most important aims of the companies is to manage warehouse operations effectively. During the management of warehouse operations two types of problems are experienced densely. First one is to define order batches and second one is to determine a suitable vehicle route for batched orders. In order to prepare effective and econom...
Article
Full-text available
The organization of order picking operations is one of the most critical issues in warehouse management. In this paper, novel tabu search (TS) algorithms integrated with a novel clustering algorithm are proposed to solve the order batching and picker routing problems jointly for multiple-cross-aisle warehouse systems. A clustering algorithm that ge...
Conference Paper
Full-text available
Bankalar tarafından en çok kullanılan borç ödeme modeli, sabit taksitli modeldir. Bunun yanı sıra finans matematiği kitaplarında yer alan geometrik ve aritmetik değişimli taksitlerle borç ödeme modelleri mevcuttur. Rastgele atlamalı sabit taksitli borç ödeme modeli Formato (1992) tarafından geliştirildi. Formato’nun modeli; Moon (1994) tarafından g...
Article
Full-text available
Depending on the development of the sense of social state, public expenditures increased and the efficient use of limited resources without compromising the service quality has become a necessity. Due to the tasks undertaken by the state, public institutions need to make certain expenditures. One of the most important item in expenditures is the ve...
Conference Paper
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Bu çalışmada çoklu çapraz geçitli depo sistemlerinde sipariş gruplama ve toplayıcı rotalama problemleri bütünleşik olarak ele alınmıştır. Belirtilen problemleri çözmek için çözüm kalitesi ve hesaplama etkinliği dikkate alınarak kümelendirme esaslı iki yeni tabu arama algoritması önerilmiştir. İlk olarak rota benzerliğini ve pişmanlık değerini kulla...
Conference Paper
Full-text available
Son ekonomik krize kadar, dünya çapındaki küresel ticarette uzun ömürlü büyüme nedeniyle konteynır trafiği önemli ölçüde büyümüştür. Bunun sonucunda, yeni konteynır terminalleri açılmış ve mevcut terminaller ise geçmişten daha fazla konteynır elleçlemek zorunda kalmışlardır. Bu sorunlarla başa çıkabilmek amacıyla, ülkemizdeki orta ölçekli bir konte...
Conference Paper
Full-text available
Müşteri ihtiyaçları doğrultusunda, sevk noktası ile talep noktası arasındaki malzemelerin akışı boyunca yer alan tüm faaliyetlerin ekonomik olarak yürütülmesi, günümüzde lojistik firmalarının en önemli hedefidir. Firmalar lojistik faaliyetlerini yönetirken yoğun olarak iki tip problemle karşılaşmaktadır. Bunlardan birincisi depo içi operasyonlarına...
Chapter
Günümüzde birçok işletme, rekabetçi ortamın bir gerekliliği olarak yalın üretim felsefesini kendi sistemlerine uygular hale gelmiştir. Sistemin temel felsefesini, performansın arttırılması için, katma değer yaratmayan operasyonların, malzemelerin ve işgücünün elimine edilmesi oluşturur. Yalın dönüşümün sağlanmasına yardımcı olan ve işletmelerin faa...
Chapter
Yalın üretim, katma değer oluşturan faaliyetlerin belirlenerek israfların elimine edildiği, sürekli iyileşmeye açık sistemlerin oluşturulması için kullanılan sistematik bir yaklaşımdır. Yalın düşünce israfların ortadan kaldırılarak üretim temin süresini düşürdüğü için günümüz rekabet şartlarında firmalara önemli bir ayrıcalık sağlamaktadır. Yalın d...
Conference Paper
Full-text available
Depo sistemlerinin yönetiminde depo işletim faaliyetlerinin etkinleştirilmesi, birim ürün maliyeti üzerindeki lojistik maliyetlerinin düşürülmesi açısından oldukça önemlidir. Depo işletim faaliyetlerinin etkinleştirilmesi için depo içi dağıtım / toplama faaliyetleri ile sipariş gruplama faaliyetlerinin eş zamanlı olarak çözülmesi gerekmektedir. Bu...
Conference Paper
Full-text available
Order batching is the problem of determining the number of orders to be picked together in one picking tour. Effectively consolidating orders into batches can significantly speed the product movement within a warehouse. On the other hand warehouse layout problem is the assignment of products to stock locations in the warehouse. Both of these proble...

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To form a network of all grey systems scholars on Research Gate, where they can share and read all basic and applied research related to Grey System Theory. Feel free to post your studies on this page responsibly so we can easily find, read, cite and share them. Journals dedicated to GST research and application: *International Journal of Grey Systems (Science Insight, USA) *Grey Systems: Theory and Application (Emerald Insight, UK) *Journal of Grey Systems (Research Informatics, UK) [In the memory of Professor Deng Julong (1933 – 2013), the founder of Grey System Theory] To know more about GST, feel free to visit: http://publish.thescienceinsight.com/index.php/ijgs/grey-system-theory