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    Application Of Integrated FTA And 5x5 Matrix for the Comprehensive Risk Evaluation of a Project-Based Enterprise
    (Harran Üniversitesi, 2021) Derse, Onur; Polat, Elifcan Göçmen
    Risk management play an important role on preventing failures of any enterprise as it ensures an effective planning and control. Not managing such failures including political, geographical, project, environmental, monetary, human, supply chain risks of the enterprises cause irreparable results. Therefore, there is a need for a comprehensive risk assessment approach regarding qualitative and quantitative risk factors. This paper tackles this need and Fishbone Diagram (FD) as a qualitative method and integrated 5x5 Matrix and Fault Tree Analysis (FTA) methods are used as quantitative methods. The root causes of the risks are examined by taking a project-based enterprise into consideration and evaluated by applying an integrated risk analysis method. Taking into account the risk analysis results obtained, measures are recommended. An improvement of approximately 24% has been achieved as a result of the application of measures. The efficiency of the proposed methods is illustrated in the real world data of a project-based pipeline manufacturing system and the obtained results demonstrate that practitioners and researchers can easily use these methods to prevent the risks.
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    Öğe
    Municipal Solid Waste Landfill Site Selection: Integrating Multi-Criteria Decision-Making Methods and Mathematical Modelling - A Case Study
    (Iğdır Üniversitesi, 2025) Derse, Onur; Polat, Elifcan Göçmen
    Increasing solid waste amount arisen from the urbanization and population growth is an inevitable outcome in many countries. Solid waste has become one of the serious environmental problems and peculiar solid waste pathways are required to prevent contamination of environment. The optimal planning of the waste management should comprise the operations such as minimization, collection, landfilling and recycling of the waste. Also, location selection for landfill of municipal solid waste (MSW) is an effective step even essential, due to growing area shortage for waste disposal. In this respect, landfilling of MSW has been addressed in Tunceli, Turkey using an integrated approach. The Fuzzy Analytical Hierarchy Process (Fuzzy-AHP), a multi-criteria decision-making (MCDM) method, is utilized to decide the weights of the environmental, technical, economic, and social criteria regarding uncertainty. Then, the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) is conducted to rank the alternative landfill districts. Finally, the sub locations of selected district are mathematical modelled regarding transport cost, investment cost and demand with an integer linear programming model. The computational results indicate the proposed method effectiveness with a systematic approach by integrating MCDM and mathematical modelling.