Browsing by Author "Turkay, Metin"

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Citation - WoS: 28
Citation - Scopus: 36
A Bi-Objective Model for Design and Analysis of Sustainable Intermodal Transportation Systems: a Case Study of Turkey
(Taylor & Francis Ltd, 2019) Resat, Hamdi Giray; Turkay, Metin
This paper presents a mixed-integer linear optimisation model to analyse the intermodal transportation systems in the Turkish transportation industry. The solution approach includes mathematical modelling, data analysis from real-life cases and solving the resulting mathematical programming problem to minimise total transportation cost and carbon dioxide emissions by using two different exact solution methods in order to find the optimal solutions. The novel approach of this paper generates Pareto solutions quickly and allows the decision makers to identify sustainable solutions by using a newly developed solution methodology for bi-objective mixed-integer linear problems in real-life cases.
Citation - WoS: 31
Citation - Scopus: 33
A Discrete-Continuous Optimization Approach for the Design and Operation of Synchromodal Transportation Networks
(Pergamon-Elsevier Science Ltd, 2019) Reşat, Hamdi Giray; Turkay, Metin
This paper presents a multi-objective mixed-integer programming problem for integrating specific characteristics of synchromodal transportation. The problem includes different objective functions including total transportation cost, travel time and CO2 emissions while optimizing the proposed network structure. Traffic congestion, time-dependent vehicle speeds and vehicle filling ratios are considered and computational results for different illustrative cases are presented with real data from the Marmara Region of Turkey. The defined non-linear model is converted into linear form and solved by using a customized implementation of the e-constraint method. Then, the sensitivity analysis of proposed mathematical models with pre-processing constraints is summarized for decision makers.