Wos Kapalı Erişimli Yayınlar
Permanent URI for this collectionhttps://hdl.handle.net/11727/10753
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Item Focusing on the big picture while observing the concerns of both managers and passengers in the post-covid era(2021) Samanci, Simge; Atalay, Kumru Didem; Isin, Feride BaharThis study reveals how to improve and define the issues of service quality in the airline sector after the outbreak of COVID-19, to what extent customer needs (important issues) and expectations (expected performances) will differ, and the priorities of airline sector managers in terms of resource allocation, costs, planned strategies, and operational efficiency and effectiveness. It offers a systematic and interactive perspective by simultaneously providing the perspective of both airline managers and passengers by using a new hybrid method, namely Fuzzy Importance, Expected Performance, and Priority Analysis (FIEPA) with VIKOR. This method allows the use of different perspectives of different managers in the analysis, which can be prioritized with different weights. According to the results of the study, in which 449 passengers participated on Twitter, the attributes on which airline managers should focus were determined, having three distinctive characteristics of being important for customers, having high priority according managers, and having low expected performance according customers. Twenty-two attributes related to the service quality of airlines during outbreak periods were classified into three main dimensions as "social distance and hygiene during flight", "information awareness and concern", and "infection alert procedure".Item The development of a reviewer selection method: a multi-level hesitant fuzzy VIKOR and TOPSIS approaches(2021) Kocak, Serdar; Ic, Yusuf Tansel; Atalay, Kumru Didem; Sert, Mustafa; Dengiz, Berna; 0000-0001-9274-7467; AGE-3003-2022This paper proposes a new approach for the selection of reviewers to evaluate research and development (R&D) projects using a new integrated hesitant fuzzy VIKOR and TOPSIS methodology. A reviewer selection model must have a multi-level framework in which reviewer selection strategies and related objectives guide the second level of the reviewer performance ranking process. The model must measure reviewer performance related to the activities that are necessary for the R&D project evaluation to be successful. A novel model is presented in this paper. In the proposed methodology, the aim is to select a reviewer in a hierarchical decision-making structure. The selection criteria values and their weights were obtained using the hesitant fuzzy VIKOR method. For the selection of a suitable reviewer, the conventional TOPSIS model was used. We developed a simpler procedure for effectively performing the reviewer selection process. The new approach was tested with a real case study and satisfactory results were obtained. A comparative analysis is also included in the article for illustrative purposes.Item A knowledge-based material selection system for interactive pressure vessel design(2020) Yurdakul, Mustafa; Balci, Arif; Ic, Yusuf Tansel; AAI-1081-2020Continual introduction of new materials and improvements in existing materials increase the variety of materials that can be used for pressure vessel components. Among wide variety of materials, the most suitable one must be selected for a component by matching its functional requirements with various available materials' specifications. This study proposes an interactive knowledge-based decision support system for selecting the most suitable material for a given pressure vessel component and its working environment. The developed decision support system, namely Pressure Vessel SELection (PVSEL), consists of two separate phases. In the first elimination phase of PVSEL, the user obtains a feasible set of alternative materials by answering various questions and providing lower-limit values at materials' critical specifications. PVSEL, then, uses a ranking phase which uses ELECTRE, TOPSIS and VIKOR methods to rank the feasible materials. In the second phase, each alternative material's ranking is determined by combining its performance values at weighted critical specifications (selection criteria), which are considered as important in meeting the functional requirements of the component. Usage of PVSEL is illustrated in the paper and the results show that the proposed PVSEL is an effective selection tool and provides meaningful results for the designers.Item Development of a multi-criteria decision-making model for comparing the performance of Turkish commercial banks(2020) Ic, Yusuf Tansel; Celik, Beril; Kavak, Sevcan; Baki, Busra; 0000-0001-9274-7467Purpose In this study, financial performance evaluation model is developed for banks aims to measure and compare the performances of banks based on their financial ratios. Design/methodology/approach Regression-AHP (Analytic Hierarchy Process)-VIKOR (Vise Kriterijumska Optimizacija I Kompromisno Resenje) integrated methodology is used. First, a literature review is done to find various bank performance measurement models with their financial metrics being compared. Then, pair-wise comparison matrices are used to find the relative weights of criteria (financial ratios) and finally VIKOR method is used to rank the banks. Findings It is believed that an AHP-based VIKOR framework helps to take up the explicit account of multi-criteria decision making (MCDM) methodologies in decision making and for selecting the best bank in the Turkish economy. Research limitations/implications In this paper, only selected financial ratios are used and analyzed for the multi-criteria decision-making (MCDM) method. Originality/value The systematic solution procedure of performance evaluating the banks helps the decision-makers to carry out performance evaluation studies for improving economic and managerial performance. This comparative study and analysis of bank performance using the regression-AHP-VIKOR combined model is presented for the first time. The authors have not become aware of any such studies in their literature review. This paper is an original framework of the application of the regression-AHP-VIKOR on the various financial performance metrics.