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Gökdalay, Meriç Hatice

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Dr. Öğr. Üyesi

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Gökdalay

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Meriç Hatice

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Meriç GÖKDALAY

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    Publication
    An algorithmic application with flexible airspace approach
    (Emerald, 2023-03-07) Ahmet Kökhan; Serhan Kökhan; Meriç Gökdalay; Gökdalay, Meriç Hatice
    Purpose The purpose of this study is to develop an operational level decision support system model for air traffic controllers (ATCos) within the framework of the Flexible Use of Airspace (FUA) concept to enable more efficient use of airspace capacity. This study produces a systematic solution to the route selection process so that the ATCo can determine the most efficient route with an operational decision support system model using Dijkstra’s Shortest Path Algorithm. Design/methodology/approach In this study, a new decision support system model for ATCos in decision-making positions was recommended and used. ATCos use this model as a main model for determining the shortest and safest route for aircraft as an operational-level decision support system. Dijkstra Algorithm, used in the model, is defined step by step and then explained with the pseudocode. Findings It has been determined that when the FUA concept and DSS are used while the ATCo chooses a route, significant fuel, time and capacity savings are achieved in flight operations. Emissions resulting from the negative environmental effects of air transportation are reduced, and significant capacity increase can be achieved. The operational level decision support system developed in the study was tested with 55 scenarios on the Ankara–Izmir flight route compared to the existing fixed route. The results for the proposed most efficient route were achieved at 11.22% distance (nm), 9.36%-time (min) savings and 837.71 kg CO2 emission savings. Originality/value As far as the literature is reviewed, most studies aimed at increasing airspace efficiency produce solutions that try to improve rather than replace the normal process. Considering the literature positioning of this study compared to other studies, the proposed model provides a new systematic solution to the problems that cause human-induced route inefficiency within the framework of the FUA concept.
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    Publication
    Aircraft Selection Decision Support Model for Fleet Planning of the Low Cost Airlines
    (Eskisehir Osmangazi University Journal of Economics and Administrative Sciences, 2023-08-01) Cem GÜNTUT; Meriç GÖKDALAY; Gökdalay, Meriç Hatice
    In this study, a decision support model was created for the aircraft type selection in the fleet planning decision of a low-cost airline and 21 sub criteria were determined for the model in five main groups as technical, economic, environmental, political and other criteria. In this decision support model, the Fuzzy TOPSIS and Fuzzy MOORA Multi Criteria Decision methods were applied, and 17 different narrow body aircraft types produced by Airbus, Boeing, Embraer, and Airbus/Bombardier aircraft manufacturers were evaluated. In the evaluation, it was found that Airbus A321NEO was the most preferable aircraft for the low-cost airline business model among the aircraft types.
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    Havalimanı Özelleştirmesi ve Değerlemesi: Türkiye’de Bulunan Çeşitli Sivil Havalimanları Üzerinde Ampirik Bir İnceleme
    (2021) Meriç H. GÖKDALAY Yaşar KÖSE; Gökdalay, Meriç Hatice; Köse, Yaşar; Türk Hava Kurumu Üniversitesi, İşletme Fakültesi, Havacılık Yönetimi Bölümü, Ankara, Türkiye Türk Hava Kurumu Üniversitesi, İşletme Fakültesi, İşletme Bölümü, Ankara, Türkiye
    Bu çalışmanın amacı Türkiye’de havalimanı sistemi içinde büyük bölgesel havalimanı statüsüne sahip olabilecek havalimanlarının değerlendirilmesi ve bu statüde olabilecek Adana, Diyarbakır, Gaziantep, Kayseri, Samsun Çarşamba ve Trabzon havalimanlarının elde edilen sonuçlara göre özelleştirilip özelleştirilemeyeceğinin ampirik analizini yapmaktır. Çalışmada; Adana, Trabzon, Kayseri, Gaziantep, Diyarbakır ve Samsun Çarşamba havalimanlarının indirgenmiş nakit akışları yöntemine (DCF) göre değerlerinin negatif olduğu ve bu sonuçlara etkisi olabilecek nedenler tespit edilmiştir. Bu sonuçlar çerçevesinde araştırmaya konu edilen havalimanlarının indirgenmiş nakit akımları yöntemine göre değerlerinin negatif olmasına rağmen, Kamu Özel İşbirliği çerçevesinde özelleştirilebileceği değerlendirilmiş ve yorumlanmıştır.