• Artificial bee colony algorithm for operating room scheduling problem with dedicated/flexible resources and cooperative operations 

  Bektur, Gülçin; Aslan, Hatice Kübra (International Journal of Optimization and Control: Theories and Applications, 2024)

  In this study operating room scheduling (ORS) problem is addressed in multi- resource manner. In the addressed problem, besides operating rooms (ORs) and surgeons, the anesthesia team is also considered as an additional ...

• A multi-objective approach to home health care routing problem with team formation 

  Bektur, Gülçin; Nenbhard, David (University of Cincinnati, 2023)

  Home health care (HHC) services provide the elderly, disabled, and those with chronic diseases health services in their homes. The demand for HHC services has increased due to the growth of the elderly population, the ...

• Lignin activated carbon obtained by a environmentally friendly green production process using deep eutectic solvents 

  Aydemir, Deniz; Ergün, Mehmet Emin; Gülsoy, Sezgin Koray; Ozan, Zeynep Eda; Gündüz, Gökhan (Wiley, 2023)

  The aim of this study was to produce activated carbon (AC) from lignin obtained with deep eutectic solvents (DESs) of choline chloride–lactic acid. For this, lignin particles were produced using the DES. The DES lignin ...

• Terrestrial biosphere water balance analysis: a mathematical model to predict the impacts of climate change on net water budget on global scale 

  Sakallı, Abdulla; Ünal, Baki (Corvinus University of Budapest, 2023)

  The industrial revolution triggered increased greenhouse gas emissions, disrupting the water cycle, and raising global temperatures by 2°C. This shift has induced extreme weather, rising sea levels, altered precipitation, ...

• Ensemble multi-attribute decision-making for material selection problems 

  Şahin, Mehmet (Springer, 2023)

  Material selection is influential in product design, manufacturing, and marketing. Appropriate material selection maximizes the performance of a product while minimizing its cost, whereas inappropriate material selection ...

• Problem areas of determining the sample size in qualitative research: a model proposal 

  Tutar, Hasan; Şahin, Mehmet; Sarkhanov, Teymur (Emerald Publishing, 2023)

  PurposeThe lack of a definite standard for determining the sample size in qualitative research leaves the research process to the initiative of the researcher, and this situation overshadows the scientificity of the research. ...

• Ensemble decision making for logistics center location 

  Şahin, Mehmet (Springer, 2023)

  Logistics centers are crucial for efficient and environmentally friendly transportation, storage, loading, unloading, maintenance, repair, and handling processes. Proper selection of a logistics center location is essential ...

• Solar panel energy production forecasting by machine learning methods and contribution of lifespan to sustainability 

  Yılmaz, Hasan; Şahin, Mehmet (Springer, 2023)

  The struggle to protect the atmosphere and the environment is increasing rapidly around the world. More work is needed to make energy production from renewable energy sources sustainable. The integration of energy with ...

• BIST100 Endeksi ve Dolar Kuru Arasındaki İlişkinin Transfer Entropisi ile Analizi 

  Ünal, Baki; Eroğlu, Yunus (Gümüşhane Üniversitesi, 2022)

  Farklı alanlardaki zaman serileri arasındaki nedenselliğin ve bilgi akışının analizi literatürde önemli bir araştırma başlığıdır ve farklı nedensellik testleri önerilmiştir. Bunlardan en yaygın kullanılanları Granger, ...

• A Mathematical Programming Approach for Multi-Objective Optimization in Designing Flexible Manufacturing Cells 

  Bozoklar, Emine; Yılmaz, Ebru (MDPI, 2023)

  The study aims to design flexible manufacturing cells with routing flexibility. A weighted mixed-integer linear mathematical programming model that aims to find optimal routing of parts in flexible manufacturing cells under ...

• Fractal Analysis of S&P 500 Sector Indexes 

  Ünal, Baki (Fiscaoeconomia International Journal Social Sciences, 2023)

  In this study multifractal properties of S&P 500 sector indexes are investigated with Multifractal Detrended Fluctuation Analysis (MF-DFA). The MF-DFA is a signal processing technique that is used to describe the multifractal ...

• Domestic flight network hub location problem under traffic disruption with sustainability provision 

  Atay, Metehan; Eroğlu, Yunus; Seçkiner, Serap Ulusam (Elsevier, 2023)

  There are many models in the current literature used extensively for the last 20 years on hub location problems and collect-distributive network structures. A centrally hub located facility serves as the main distribution ...

• Intraday Seasonality and Volatility Pattern: An Explanation with Recurrence Quantification Analysis 

  Ünal, Baki; Küçükkocaoğlu, Güray; Kadıoğlu, Eyüp (World Scientific, 2023)

  The Recurrence Quantification Analysis (RQA), a pattern recognition-based time series analysis method, can be successfully utilized for short, nonstationary, nonlinear, and chaotic time series. These RQA measures quantify ...

• Time-Varying Fractal Analysis of Exchange Rates 

  Ünal, Baki (Chaos Theory and Applications, 2023)

  The foreign exchange (forex) market is a dynamic and complex financial arena where the exchange rates of various currency pairs fluctuate continuously. Among these currency pairs, EUR/TRY and USD/TRY hold significant ...

• Decision making in the manufacturing environment using the technique of precise order preference 

  Altuntaş, Serkan; Dereli, Türkay; Erdoğan, Zülfiye (Yildiz Technical University, 2023)

  Wrong decisions in manufacturing systems can jeopardize the continuity of production and reduce productivity and efficiency. Therefore, it is essential to make the right decisions in solving the problems encountered in ...

• Text Mining Approach for Trend Tracking in Scientific Research: A Case Study on Forest Fire 

  Eroğlu, Yunus (MDPI, 2023)

  Scientific studies are increasing day by day with the development of technology. Today, more than 171 billion academic records are made available to researchers via the Web of Science database, which is frequently followed ...

• A variant of the NSGA II for the speed scaling distributed flow shop scheduling problem with total tardiness minimisation 

  Bektur, Gülçin (IOS Press BV, 2023)

  In this study, an energy-efficient distributed flowshop scheduling (DFSS) problem with total tardiness minimisation and machine-sequence dependent setup times is addressed. A mixed integer linear programming (MILP) model ...

• İklim değişikliği ve iklimde meydana gelen ekstrem durumların bitkilerin fenolojik evreleri, ürün miktarı, biyokütle ve karbon tutma kapasiteleri üzerine olan etkilerinin incelenmesi 

  Abdulla Sakallı (Yürütücü); Murat Tiryakioğlu (Araştırmacı); Mehmet Ali Devrim (Bursiyer); Umut Bulut (Bursiyer); Enes Birinci (Bursiyer) (İskenderun Teknik Üniversitesi, 2021)

  Sanayi devrimi ile birlikte, atmosferdeki sera gazı salınımındaki hızlı artıs, dünya yüzey sıcaklıgının günümüz itibariyle artan bir trend göstermesine sebep olmustur. Dünyadaki ortalama sıcaklık artısı günümüzde 2ºC?ye ...

• Yapay Sinir Ağları ve Adaptif Nörobulanık Sistemler ile 3. İstanbul Havalimanı Talep Tahmini ve Türk Hava Yolları İç Hat Filo Optimizasyonu 

  Atay, Metehan; Eroğlu, Yunus; Seçkiner, Serap Ulusam (Endüstri Mühendisliği Dergisi, 2019)

  Bu çalışmanın amacı, İstanbul Atatürk Havalimanı’na ikame olarak inşa edilen 3.İstanbul havalimanının gelecek yıllardaki yolcu, yük talebi ve iç hat filosunu tahminetmek ve planlayabilmektir. İstanbul Atatürk Havalimanının ...

• Forecasting COVID-19 Cases based on mobility 

  Şahin, Mehmet (Manas Journal of Engineering, 2020)

  Countries struggling to overcome the profound and devastating effects of COVID-19 have started taking steps to return to the "new normal." Any accurate forecasting can help countries and decision-makers make plans and ...

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