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ÇİLİNGİRTÜRK, AHMET METE

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ÇİLİNGİRTÜRK

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AHMET METE

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2011 - 201922020 - 20221
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    Simulation-based optimisation approach to multi-choice transportation problem
    (2022-01-01) YILMAZ SOYDAN, NACİYE TUBA; ÇİLİNGİRTÜRK, AHMET METE; YILMAZ SOYDAN N. T. , ÇİLİNGİRTÜRK A. M.
    Copyright © 2022 Inderscience Enterprises Ltd.The classical transportation problem minimises the total costs of transportation of a unique product from various supply points (or warehouses) to demand points. The problem assumes that freight costs from source to destination are constant and that the supply and demand quantities are equal and strictly known, so the market for the product is well-balanced. It thus involves a special type of linear integer programming, which becomes stochastic since the constraints or parameters are random variables from a known or unknown distribution. Several studies have formulated well-known deterministic models under probabilistic restrictions. The transformed models mostly keep the confidence level at a given minimum constant or else minimise the error level. Also, there is a multi-choice stochastic transportation problem, which introduces several unit costs. In this study, we try to simulate Roy\"s (2014) multi-choice stochastic transport model with random supply and demand quantities from a given Weibull distribution and compare the results of distribution and total costs. As a result of the simulation, total cost value was estimated lower than the result of the problem.
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    Comparative analysis of EU and candidate countries resource efficiency
    (2011-11-01) ÇİLİNGİRTÜRK, AHMET METE; Kocak H., ÇİLİNGİRTÜRK A. M.
    European Union is a regional integration project with its social and economic objectives. it is an important economic power competing with U.S. at west and with Chine at east. It aims the economic homogeneity of the member states and candidate countries in its region. This study aims to rank 27 EU members and 3 candidate countries according to their assumed input-output structures for the years 2002 and 2006. CCR and BCC Data Envelopment Analysis models were used to determine relative efficiency, so effective and non-effective countries were discriminated. Furthermore Super-Efficiency model of DEA was used to evaluate the effective countries. The findings are interpreted as that the EU achieves some of the specified important objectives.
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    The ranking analysis of the petroleum and related products’ companies
    (2017-02-01) ÇİLİNGİRTÜRK, AHMET METE; KOÇAK, HABİP; KİSTİK, VİLDAN; Çilingirtürk A. M. , Koçak H., Kistik V.
    In competitive markets, companies search their positions according to their competitors with internal resources or make use of the services of market research firms. Various credit and rating agencies or co-ordination for sectors with some social and political remediation also examine and rank the companies in these sectors. These companies are listed on the Stock Exchange Istanbul. Petroleum and derivatives industries, which are important sources of energy for industrial and Turkey, have been reconsidered in the Fortune 500 ranking by MOORA and COPRAS optimization methods and with statistical factor analysis with various efficiency and size indicating financial ratios. The results obtained are consistent within themselves and differ from the Fortune 500 rank order. The difference between quality and quantity can lead companies to wrong strategies in this sort of ranking. The study might be important to bring out efficiency and productivity in the sense of planning possible strategic changes.