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    A decision support model based on q-rung orthopair fuzzy number for glove design application
    (Springer, 2022) Efe, Ömer Faruk; Efe, Burak
    Quality function deployment (QFD) method allows reviewing of customer requirements (CRs) and design requirements (DRs) simultaneously in order to handle the correlations and relationships of CRs and DRs in calculations. It has been often combined with fuzzy numbers because it provides to gather the judgments of experts in vagueness environment more correctly and easily. This paper suggests employing q-rung orthopair fuzzy number (q-ROFN) for improving the fuzzy QFD approach. The proposed q-ROFN based QFD method uses q-ROFN to adjust the weights of CRs based the relationships between CRs and DRs with the help of the correlations and relationships of CRs and DRs. q-ROFN presents more information than numbers such as intuitionistic fuzzy number and Pythagorean fuzzy number about the correlations and relationships of CRs and DRs. VIKOR (VIsekriterijumska optimizacija i KOm-promisno Resenje) approach based on q-ROFN is also used to rank DRs. The new proposed integrated method has been applied for evaluating the anthropometry based glove design. The results show that the most important DR for anthropometry based glove design is ease of hand motion perception.
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    A GIS-based FAHP and FEDAS analysis framework for suitable site selection of a hybrid offshore wind and solar power plant
    (Elsevier, 2023) Karipoglu, Fatih; Ozturk, Samet; Efe, Burak
    This study presents a Geographic Information System (GIS) based suitable site selection methodology for a hybrid system that includes offshore wind and solar PV. The methodology utilizes open source databases about decision criteria and applies this data using GIS to determine suitable sites for offshore wind and solar PV systems. For the assessment of multi-criteria which affect the potential hybrid energy power plants and the determination of the best suitable areas, Fuzzy Analytical Hierarchy Process (FAHP) and Fuzzy Evaluation based on Distance Average Solution (FEDAS) are used in the study. Results show that technical criteria has the priority weight of 0.60 while the weight of social criteria is about 0.07. Among sub-criteria, the wind speed has the highest priority weight while distance to port and visibility are the highest criteria of priority weight under economic and social main criteria, respectively. Among the alternatives, Area 2 (A-2) is determined as the best alternative for hybrid offshore power plants in the study area. This proposed methodology can be utilized by decision-makers to determine the best suitable locations for hybrid offshore wind and solar PV systems at any location. This paper suggests a new approach integrating GIS, fuzzy setbased AHP and EDAS as a novelty.
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    A model proposal to examine the effects of ships to marine pollution in terms of internal and external factors
    (Springer, 2022) Efe, Burak; Efe, Ömer Faruk; Ishizaka, Alessio
    Marine pollution is an important environmental problem. One of the important causes of marine pollution is ship origin. This study deals with defining the importance degrees of ship origin marine pollution criteria. This paper suggests employing quality function deployment (QFD), interval type-2 fuzzy (IT2F) numbers, TOPSIS (technique for order performance by similarity to ideal solution) and SWOT analysis to determine these importance degrees. Internal factors, which indicate the strengths and weaknesses of the SWOT analysis in this paper, are the infrastructure of the sea to prevent pollution. External factors, which indicate the opportunities and threats of the SWOT analysis in this paper, are ship-related activities that cause pollution of the relevant sea. Five CRs and fourteen DRs are handled to examine ship origin marine pollution. Three experts have presented their judgments about the correlations and relationships of design requirements (DRs) and customer requirements (CRs). The proposed IT2F number-based QFD method uses IT2F numbers to determine the weights of DRs with the help of the correlations and relationships of the DRs and CRs. The most important internal factors are complying with the law and hard supervision, respectively. The most important external factors are direct discharge of waters of tank washing, direct discharge of ballast waters of ships and direct discharge of bilge waters of ships, respectively. Four seas are ranked in terms of ship origin marine pollution by using TOPSIS approach based on IT2F number. The most polluted sea exposed to ship origin marine pollution is Sea of Marmara according to the obtained results.
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    A Novel Approach by Combining Fuzzy AHP and a Simulation Model to Analyze Suitability of Ports for Offshore Wind Farms
    (Int Soc Offshore Polar Engineers, 2025) Ozturk, Samet; Karipoglu, Fatih; Efe, Burak
    This study presents a comprehensive suitability analysis for assessing the serviceability of existing container ports for offshore wind farms (OWFs) in Turkey, utilizing a combination of fuzzy analytical hierarchy process with Arena simulation modeling. This study is the first comprehensive analysis of offshore wind port infrastructure that integrates a multi-criteria decision making process with an Arena simulation model tailored specifically for existing container ports. The results indicate that technical criteria are deemed most critical, carrying the highest weight (0.563), with expansion potential identified as the most impactful criterion within the technical category. In addition, the study employs the Arena simulation software to forecast the operational workload on the most suitable ports following potential OWF installations.
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    Ergonomic Glove Design by Using an Integrated Approach
    (Fevzullah TEMURTAŞ, 2023) Efe, Burak; Efe, Ömer; Şehitoğlu, Meryem
    Hand injuries in work accidents frequently occur in firm. The use of gloves as personal protective equipment is recommended by experts to reduce or prevent hand injuries. While these gloves increase the safety of employees against hand injuries, it is aimed not to have a negative impact on their performance. This study has determined 15 criteria for an ergonomic glove that will not decrease the performance of the employees, taking into consideration the literature research and expert opinions. The most suitable ergonomic glove was chosen among five alternative gloves by taking the opinions of three experts. This study aims to select the most suitable glove using the interval type-2 fuzzy (IT2F) number based TOPSIS approach. IT2F number is proposed to reduce the loss of information in expert opinions. Type-1 fuzzy number is shown with a single membership degree. IT2F number consists of two membership degrees unlike type-1 fuzzy number. The part between these two membership degrees expresses the expert opinion. The judgments of three experts were collected by employing the IT2F number and hand dexterity criterion was defined as the most significant criterion for an ergonomic glove. This paper also uses Bayesian network to analyze the customer satisfaction level based on four performance indicators. The biggest exchange for high customer satisfaction of alternative 1 is caused from finger root circumference between four performance indicators. This study ensures to the literature a new perspective by proposing multi-criteria decision making technique and Bayesian network to form an ergonomic glove.
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    Fine-Kinney method based on fuzzy logic for natural gas pipeline project risk assessment
    (Springer, 2023) Efe, Burak; Efe, oemer Faruk
    Quality function deployment (QFD) method allows reviewing of customer requirements (CRs) and design requirements (DRs) simultaneously in order to handle the correlations and relationships of CRs and DRs in calculations. It has been often combined with fuzzy numbers, because it provides to gather the judgments of experts in vagueness environment more correctly and easily. This paper suggests employing q-rung orthopair fuzzy number (q-ROFN) for improving the fuzzy QFD approach. The proposed q-ROFN based QFD method uses q-ROFN to adjust the importance degrees of CRs based the relationships between CRs and DRs with the help of the correlations and relationships of CRs and DRs. q-ROFN presents more information than numbers such as intuitionistic fuzzy number and Pythagorean fuzzy number about the correlations and relationships of CRs and DRs. Furthermore, this work proposes integrating Fine-Kinney method and QFD method to cope with limitations of Fine-Kinney method. VIKOR (VIsekriterijumska optimizacija i KOm-promisno Resenje) approach based on q-ROFN is also used to rank DRs. The proposed integrated method provides a novel decision support model for the natural gas pipeline project (NGPP) risk assessment. There is no study about the integration of Fine-Kinney, q-ROFN-based QFD, VIKOR methods. The most significant DR and the second most important DR for NGPP risk assessment are electrical sparks and coating type factor, respectively. The results of this model present a road map to the managers of NGPP for an occupational health and safety policy by ordering the failure modes.