Yazar "Ozceylan, Eren" seçeneğine göre listele
Listeleniyor 1 - 15 / 15
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe A GIS-based AHP approach for emergency warehouse site selection: A case close to Turkey-Syria border(Academic Publication Council, 2022) Cetinkaya, Cihan; Ozceylan, Eren; Keser, IlhanAlthough the term disaster includes natural events like earthquake, flood, and drought, it also covers the wars, intense migration waves, industrial accidents, and even epidemic diseases. In recent years, the number and severity of both natural and man-made disasters has been increasing. In this context Gaziantep-the border city of Turkey to Syria-is facing many logistical problems because of the crisis in the region that has a broad repercussion in press. In addition, the coronavirus pandemic increased the supply traffic in the region. The region is in need for many emergency warehouses to store the emergency supplies and send to the needy. Thus, a three-step hybrid solution method is developed to solve this real life problem. The first stage is the determination of selection criteria; secondly the spatial database is created by using a Geographical Information System (GIS). Then, Analytic Hierarchy Process (AHP) technique is applied to assign the importance levels to the selection criteria to generate the suitability map to choose the most appropriate emergency warehouse site selection in Gaziantep. Additionally, scenario analyses are conducted to understand the effects of importance levels on the problem results. As a result, 1.3% of the study area is determined as quite suitable for establishing an emergency warehouse.Öğe A GIS-based DANP-VIKOR approach to evaluate R&D performance of Turkish cities(Emerald Group Publishing Ltd, 2019) Ozkan, Baris; Ozceylan, Eren; Korkmaz, Ibrahim Halil; Cetinkaya, CihanPurpose The purpose of this study is to measure the R&D performance of 81 cities in Turkey by using a scientific approach. Design/methodology/approach A four-step solution approach is developed for this problem. In the first step, a hierarchical structure of 14 indicators (including number of patents, publications, R&D expense, etc.) in three dimensions is constructed. In the second step, explicitly and implicitly spatial indicators such as university location and R&D manpower are mapped by using geographic information system (GIS). In the third step, a hybrid multi-criteria decision making model, namely, DANP that combines decision-making trial and evaluation laboratory (DEMATEL) and analytic hierarchy process (ANP) techniques is applied to assign different level of importance to the indicators. In the last step, Visekriterijumska Optimizacijai kompromisno Resenje (VIKOR) method is used to rank the performance of 81 cities. Obtained results are visualized using GIS to show the pros and cons of each city in terms of R&D performance. Findings Results of the paper show that Istanbul, Ankara and Konya are ordered as contenders of best R&D performances and on the contrary, Igdir, Sirnak and Tunceli are ordered as the worst R&D performances among 81 cities. Research limitations/implications - One limitation of the study can be the considered criteria. However, all the criteria are obtained from literature and experts; thus, the paper covers as much criteria as possible. Practical implications - The proposed study may allow Ministry of Science, Industry and Technology of Turkey to formulate more effective strategies to improve cities' R&D performance. In addition, any country can apply the same methodology for measuring the R&D performance of their cities by using their related data. As the worst R&D city performances belong to the eastern part of Turkey, it can be deducted that the socio-cultural structure of the eastern part of the country needs improvement. Originality/value To the best of the author's knowledge, this is the first study which applies a GIS-based MCDM approach for R&D performance measurement. Thus, the value of this paper belongs to both literature and real life.Öğe A GIS-based MCDM approach for the evaluation of bike-share stations(Elsevier Sci Ltd, 2018) Kabak, Mehmet; Erbas, Mehmet; Cetinkaya, Cihan; Ozceylan, Eren-Several benefits have contributed to the increasing popularity of bike-share systems in cities around the world. In addition to traffic congestion, environmental concerns are also compelling cities to seek more sustainable modes of transportation. A key factor in the efficacy of bike-share networks is the location of bike stations in relation to potential related criteria. Therefore, site suitability analysis for bike-share stations using quantitative methods is essential. This study attempted to evaluate the current status of bike-share stations in Karsiyaka, Izmir, and to locate future station sites by comparing them to existing stations. To do so, different multi-criteria decision-making methods were combined with a geographic information system (GIS) to address twelve conflicting criteria. Specifically, the analytic hierarchy process was applied to obtain criteria weights, and multi-objective optimization by ratio analysis was used to evaluate current and potential alternatives. Our study demonstrates the superiority of the suggested locations compared to the existing stations. (C) 2018 Elsevier Ltd. All rights reserved.Öğe A Hybrid Model Based on FAHP and WASPAS for Evaluation of Explosive and Narcotics Trace Detection Devices(Springer Science and Business Media Deutschland GmbH, 2022) Ozceylan, Eren; Ozkan, Baris; Cetinkaya, CihanAs a result of Industry 4.0, the aviation industry is started to be re-designed with cyber–physical systems, Internet of Things, cloud computing and similar technologies. In Aviation 4.0, where cyber–physical systems are used to assist humans’ unkind work and to complete tasks autonomously, security applications are one of the promising and tight operations that need to be considered. The detection of explosives and narcotics material for the purposes of aviation security is an important area for preventing terrorism and smuggling. For this purpose, there are some novel technologies (devices) in the framework of Aviation 4.0. Evaluation and selection the best device is a multi-criteria decision making (MCDM) problem which includes ambiguities and vagueness. To do so, fuzzy analytic hierarchy process (FAHP) is applied for assigning weights of the attributes and weighted aggregated sum product assessment (WASPAS) method is used to determine the most suitable alternative device for explosive and narcotics trace detection. As a result, three well-known devices in the market are evaluated and the best alternative is suggested. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.Öğe A Logistics Performance Index Review: A Glance at the World's Best and Worst Ten Performances(Springer International Publishing Ag, 2021) Cetinkaya, Cihan; Ozceylan, ErenTransport and logistics have a very significant place in international trade. Thus, the measurement of logistics performance is directly related with a country's trade income. The Logistics Performance Index (LPI) was created by the World Bank to measure the performance of countries in the field of logistics. The index is created after asking a number of categorized questions to employees and managers of several logistics companies located in each country and determining the results with respect to the question scores. Although it is not the only determiner in this sector, the LPI is very important because the supply chain members use this index as a decision making tool. The index is released biennially and there are 6 reports between 2007 and 2018. In this paper, 6 Logistics Performance Reports are analyzed; the top 10 and worst 10 performances are criticized. Also Turkey's overall performance is examined and discussed specifically. The intersection countries are highlighted and the reasons are discussed. It is determined that generally high income countries are performing well and the countries with internal disturbances are performing indifferently. It is believed that this research will be helpful to understand the global picture of logistics activities.Öğe A mass vaccination site selection problem: An application of GIS and entropy-based MAUT approach(Elsevier Science Inc, 2023) Cetinkaya, Cihan; Erbas, Mehmet; Kabak, Mehmet; Ozceylan, ErenCoronavirus disease (COVID-19) was recognized in December 2019 and spread very severely throughout the world. In 2022 May, the total death numbers reached 6.28 million people worldwide. During the pandemic, some alternative vaccines were discovered in the middle of 2020. Today, many countries are struggling to supply vaccines and vaccinate their citizens. Besides the difficulties of vaccine supply, mass vaccination is a challenging but mandatory task for the countries. Within this context, determining the mass vaccination site is very important for recovering, thus a five-step approach is generated in this paper to solve this real-life problem. Firstly the mass vaccination site selection criteria are determined, and secondly, the spatial data are collected and mapped by using Geographical Information System (GIS) software. Then, the entropy weighting method (EWM) is used for determining the relative importance levels of criteria and fourthly, the multiple attribute utility theory (MAUT) approach is used for ranking the potential mass vaccination sites. Lastly, ranked alternative sites are analyzed using network analyst tool of GIS in terms of covered population. A case study is conducted in Gaziantep city which is the ninth most population and having above-average COVID-19 patients in Turkey. As a result, the fourth alternative (around the S,ehitkamil Monument) is chosen as the best mass vaccination site for the city. It is believed that the outcomes of the paper could be used by city planners and decision-makers.Öğe A multi-criteria spatial analysis using GIS to evaluate potential sites for a new border gate on Turkey's Syria frontier(Inderscience Enterprises Ltd, 2020) Kabak, Mehmet; Ozceylan, Eren; Erbas, Mehmet; Cetinkaya, CihanAfter the internal disturbance in Syria in 2011, many Syrian refugees migrated to Turkey progressively, and the Turkish Government provided humanitarian aid to people in Syria. These incidents caused a huge amount of density on current border gates. Also, increasing potential terrorist attacks and growing frontier infringements also create a need for a new border gate on Turkey's Syria frontier. Thus, a four-step hybrid solution approach is developed for this problem. This approach starts with determination of selection criteria; then, the spatial database of these criteria is created by using a geographical information system. In the third step, the DEMATEL technique is applied to assign importance levels to the criteria. Lastly, MULTIMOORA technique is used to rank the potential sites. The results indicate that, recommended potential sites are more suitable than current border gates. This paper can serve as a scientific-base while selecting the optimal site for border gates. [Received: 8 February 2019; Revised: 1 July 2019; Accepted: 7 August 2019]Öğe An eco-friendly evaluation for locating wheat processing plants: an integrated approach based on interval type-2 fuzzy AHP and COPRAS(Springer, 2022) Cetinkaya, Cihan; Ozkan, Baris; Ozceylan, Eren; Haffar, SamerSite selection for organizations is a complex and unstructured problem that must be analyzed carefully and properly since a localization error could drive to bankruptcy. This problem has been discussed widely and effectively using multi-criteria decision-making methods in a manufacturing context, but it has been little studied in the agricultural industry. The aim of this study is to proposing a methodological approach to evaluate the fifty states in the United States (US) in terms of wheat processing plant locations. To do so, a literature review is searched to determine the ten sub-criteria under financial, environmental, and spatial dimensions. To overcome the uncertainty of experts' judgment in criteria prioritization, interval type-2 fuzzy (IT2F)-analytic hierarchy process is used. The method of complex proportional assessment of alternatives is used to obtain the final rank of states. The results and verification of the methodology are carried out throughout a sensitivity analysis of the weights. The results of sensitivity analysis indicated that when financial aspects are focused upon, California is the best alternative, followed by Texas and Oklahoma. In addition, from the environmental and spatial perspectives, Vermont and California are the best choices, respectively. The findings of this study can provide useful information to wheat plant decision-makers and serve as a reference for US policy.Öğe Analysing Vehicle Routing in Urban Pest Control Using a Cluster-First Route-Second Approach(Institute of Electrical and Electronics Engineers Inc., 2023) Alisan, Yigit; Serin, Faruk; Mete, Suleyman; Ozceylan, ErenInsects are generally characterized as organisms that have negative impacts on both human health and the environment in areas where human habitation exists. These pests typically inhabit and reproduce in locations that contain waste, such as garbage sites, abandoned places, and septic tanks. House flies, for instance, can significantly affect the daily lives of individuals and even prompt widespread epidemics by transmitting diseases to humans. To mitigate the proliferation of pests and minimize their environmental damage, pest control is a crucial responsibility that falls under the jurisdiction of municipalities in Turkey. Municipalities commonly utilize chemical-based methods that are non-hazardous to humans and the environment while concurrently efficacious in exterminating pests or thwarting their reproduction. These chemicals are typically prepared by experts and then applied to the areas in which the pests reside. However, the primary issue that municipalities encounter is the vast expanse of land that needs to be managed, coupled with limited resources in terms of both human labor and equipment, alongside the dispersal of pests' living and breeding locations throughout a broad territory. To address this problem, this study employed the coordinates of previously identified insect nests. These nests were divided into clusters based on predetermined criteria using the k-means method within the municipality borders. Then, utilizing Google or-tools, the distance to be covered by the vehicle for each cluster was calculated. Finally, comparisons were made between the obtained results, and various recommendations were proposed. © 2023 IEEE.Öğe Analysis of Potential High-Speed Rail Routes: A Case of GIS-Based Multicriteria Evaluation in Turkey(Asce-Amer Soc Civil Engineers, 2021) Ozceylan, Eren; Erbas, Mehmet; Cetinkaya, Cihan; Kabak, MehmetAll over the world, governments, policy makers, and practitioners are searching for proper routes and corridors to invest transportation infrastructures such as new railways, highways, and multimodal ways. Although it is one of the important steps of development, finding a suitable route for new transport infrastructure is a complicated and conflicting task for of various reasons. Possible social and environmental impacts on society and increasing cost and technical pressures on decision makers are some of these reasons. Taking into consideration aspects of different evaluation criteria, a geographic information system (GIS)-based multicriteria solution approach is proposed in this study. Potential high-speed rail (HSR) routes in Turkey are considered as a case study. After gathering and processing the related GIS data, weights are assigned to each criterion by using the fuzzy analytic hierarchy process in order to indicate their relative importance. Then, the additive ratio assessment method is applied to carry out the multicriteria (13 technical, social, and demographic criteria) evaluation and selection of the suitable alternatives (among 20 HSR routes) under given circumstances. It was found that the corridor from the west part of Turkey (from Izmir and Manisa) to the Marmara region (Kocaeli and Istanbul) had the highest priority, followed by the corridor from Ankara to Kayseri. HSR trains could potentially reduce the journey times to Kocaeli and Istanbul from Izmir and Manisa, as compared with driving, by 46% and 45%, respectively. The results of this study can be used to evaluate potential HSR corridors/routes or similar transport infrastructures in other countries.Öğe Emergency Shelter Site Selection in Maar Shurin Community of Idlib (Syria)(Penn State Univ Press, 2021) Cetinkaya, Cihan; Ozceylan, Eren; Isleyen, Selcuk KursatConstructing shelters is one of the most important precautions to reduce human casualties during disasters. The critical point in locating the shelter is the selection of the proper site. Unless shelters are placed in the right locations, they cannot serve as lifesaving tools. In this article, shelter site selection for a conflict area in Syria is taken into account. Notoriously, Syria has been facing these conflicts since 2011 and the intensity of the incidents is varying from region to region. Thus, in this study, Maar Shurin Community of Idlib is chosen as the study area because of its high airstrike/casualty statistics in 2018. A geographic information system (GIS) and its multicriteria decision analysis (MCDA) tools are used for determining the shelter site. Four different scenarios based on different criteria weights are generated to provide alternative solutions. It is believed that the outputs of the proposed methodology can help the local administration to solve its real-life problems.Öğe Evaluation of ecotourism sites: a GIS-based multi-criteria decision analysis(Emerald Group Publishing Ltd, 2018) Cetinkaya, Cihan; Kabak, Mehmet; Erbas, Mehmet; Ozceylan, ErenPurpose - The aim of this study is to evaluate the potential geographic locations for ecotourism activities and to select the best one among alternatives. Design/methodology/approach - The proposed model consists of four sequential phases. In the first phase, different geographic criteria are determined based on existing literature, and data are gathered using GIS. On equal criteria weighing, alternative locations are determined using GIS in the second phase. In the third phase, the identified criteria are weighted using analytical hierarchy process (AHP) by various stakeholders of potential ecotourism sites. In the fourth phase, the PROMETIIEE method is applied to determine the best alternative based on the weighted criteria. Findings - A framework including four sequential steps is proposed. Using real data from the Black Sea region in Turkey, the authors test the applicability of the evaluation approach and compare the best alternative obtained by the proposed method for nine cities in the region. Consequently, west of Sinop, east of Amin and south of the Black Sea region are determined as very suitable locations for ecotourism. Research limitations/implications - The first limitation of the study is considered the number of included criteria. Another limitation is the use of deterministic parameters that do not cope with uncertainty. Further research can be conducted for determining the optimum locations for different types of tourism, e.g. religion tourism, hunting tourism and golf tourism, for effective tourism planning. Practical implications - The proposed approach can be applied to all area that cover the considered criteria. The approach has been tested in the Black Sea region (nine cities) in Turkey. Social implications - Using the proposed approach, decision-makers can determine locations where environmentally responsible travel to natural areas to enjoy and appreciate nature that promotes conservation have a low visitor impact and provide for beneficially active socioeconomic involvement of local individuals. Originality/value - To the best knowledge of the authors, this is the first study which applies a GIS-based multi-criteria decision-making approach for ecotourism site selection.Öğe EVALUATION OF NATURAL GAS STRATEGIES OF TURKEY IN EAST MEDITERRANEAN REGION: A STRENGTHS-WEAKNESSES-OPPORTUNITIES-THREATS AND ANALYTIC NETWORK PROCESS APPROACH(Vilnius Gediminas Tech Univ, 2018) Genc, Tolga; Kabak, Mehmet; Ozceylan, Eren; Cetinkaya, CihanDemand for natural gas has severely challenged the world supply among other types of energy sources such as coal, geothermal, nuclear and etc. Natural gas is the most important form of energy because it is clean, abundant, reliable and versatile. Due to the limited and transportable characterizes of natural gas, sharing pipelines for natural gas with other nations can either bring peace and stability or create chaos. To avoid insoluble strategies, it is wry explicit to decide scientifically for these kinds of global issues. To do so, a SWOT (Strengths, Weaknesses, Opportunities and Threats) - ANP (Analytic Network Process) integrated approach is presented to evaluate natural gas policies for Turkey in terms of East Mediterranean Region. In the first step, the appropriate strategies, SO (strengths-opportunities), ST (strengths-threats), WO (weaknesses-opportunities) and WT (weaknesses-threats) are determined via SWOT analysis including four criteria, 20 sub-criteria and seven strategies. Due to inability of SWOT analysis to prioritize the criteria and rank the strategies, ANP approach which also considers the dependency between criteria is applied in the second step. Finally, the proposed SWOT-ANP approach is compared with other multi criteria decision making (MCDM) techniques to represent the effectiveness and applicability of the model.Öğe Optimal siting of electric vehicle charging stations: A GIS-based fuzzy Multi-Criteria Decision Analysis(Pergamon-Elsevier Science Ltd, 2018) Erbas, Mehmet; Kabak, Mehmet; Ozceylan, Eren; Cetinkaya, CihanElectric vehicles (EVs) are both economic and ecological vehicles which get their power from rechargeable batteries inside the car. Since they have a lot advantages as producing nearly no carbon emissions or pollution, being cost effective and less noisy; the main disadvantage of these vehicles are recharge related problems. One approach to deal with this problem is to construct electric vehicle charging stations (EVCS). A proper EVCS also should be located very carefully to maximize EV usage. Thus in this paper a geographic information system (GIS)-based MCDA approach is applied to address the EVCS site selection. Fuzzy analytical hierarchy process (AHP) and technique for order preference by similarity to ideal solution (TOPSIS) methods are applied to choose the optimal EVCS sites. A four-step solution approach is developed for the problem: (i) determination of 15 criteria from different perspectives, (ii) using GIS to assign EVCS site availability score, (iii) prioritizing the criteria using fuzzy AHP and finally (iv) ranking the potential sites by using TOPSIS. Proposed hybrid methodology is applied to Ankara (capital city of Turkey) as a case study. Results show that suggested alternative locations outperform the current locations of 12 EVCS in terms of considered criteria. (C) 2018 Elsevier Ltd. All rights reserved.Öğe TESTING OF TREE-SEED ALGORITHM ON P-MEDIAN BENCHMARK PROBLEMS(Yildiz Technical Univ, 2019) Eliguzel, Ibrahim Mirac; Ozceylan, Eren; Cetinkaya, CihanThis paper presents an application of tree-seed algorithm (TSA) - which is based on the relation between trees and their seeds- on the P-median benchmark problems. To the best knowledge of the authors, this is the first study which applies TSA to the P-median problem. In this paper, different P-median problem instances are generated to show the applicability of the TSA. The experimental results are compared with the optimal results obtained by GAMS-CPLEX. Also, TSA is applied on data sets from OR-Library, and then the obtained and known optimal results are compared. The comparisons demonstrate that the TSA can find optimal and near-optimal values for the small and medium-sized problems, respectively.
