Browsing by Author "Kabak, Özgür"
Now showing items 1-20 of 33
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Aggregating forecasts to obtain fuzzy demands
Kabak, Özgür; Ülengin, Füsun (World Scientific, 2008)There are several studies in the literature that assumes fuzzy demands in supply chain or production planning models but most of them do not mention about how to derive the fuzzy demands from statistical and judgmental ... -
Analysis of the impact of bilateral and transit quotas on Turkey's international trade by road transport : an integrated maximum flow and gravity model approach
Çekyay, Bora; Toktaş Palut, Peral; Kabak, Özgür; Ülengin, Füsun; Özaydın, Özay; Ülengin, Burç (Elsevier, 2017-05)We explore whether bilateral and transit quotas applied by EU countries on Turkey have a negative impact on Turkey's international trade by road transport. Therefore, Turkey's exports by road transport to selected European ... -
Analysis of the impact of bilateral and transit quotas on Turkey's international trade by road transport: An integrated maximum flow and gravity model approach
Çekyay, Bora; Toktaş Palut, Peral; Kabak, Özgür; Ülengin, Füsun; Özaydın, Özay; Ülengin, Kemal Burç (Elsevier, 2017-12)We explore whether bilateral and transit quotas applied by EU countries on Turkey have a negative impact on Turkey's international trade by road transport. Therefore, Turkey's exports by road transport to selected European ... -
Analyzing competitiveness of automotive industry through cumulative belief degrees
Kabak, Özgür; Ülengin, Füsun; Önsel Ekici, Şule; Özaydin, Özay; Aktaş, Emel (World Scientific, 2012)This study aims to analyze the automotive industry from competitiveness perspective using a novel cumulative belief degrees (CBD) approach. For this purpose, a mathematical model based on CBD is proposed to quantify the ... -
Are road transportation investments in line with demand projections? A gravity - based analysis for Turkey
Ülengin, Füsun; Özaydın, Özay; Ülengin, Burç; Kopp, Andreas; Önsel Ekici, Şule; Kabak, Özgür; Aktaş, Emel (Elsevier, 2013-09)In this research, an integrated gravity-based model was built, and a scenario analysis was conducted to project the demand levels for routes related to the highway projects suggested in TINA-Turkey. The gravity-based model ... -
Assessment of implication of competitiveness on human development of countries through data envelopment analysis and cluster analysis
Globalization speeds up competition among nations in various sectors. In terms of multinational and transnational phenomena, countries are seen as inescapable from competition, thus the linking of the term global with ... -
A cluster-based approach for the innovation assessment of countries
Önsel Ekici, Şule; Ülengin, Füsun; Kabak, Özgür (IEEE, 2008)In this paper, 100 countries investigated by World Economic Forum are analyzed and compared according to their innovation and technological readiness related criteria for 2004 and 2007 respectively. In total, 15 criteria ... -
The competitiveness of nations and implications for human development
Ülengin, Füsun; Kabak, Özgür; Önsel Ekici, Şule; Aktaş, Emel; Parker, Barnett R. (Elsevier, 2011-03)Human development should be the ultimate objective of human activity, its aim being healthier, longer, and fuller lives. Thus, if the competitiveness of a nation is properly managed, enhanced human welfare should be the ... -
A comprehensive analysis of the logistics sector in Turkey to identify the requirements for technological improvement
Ağaran, Berrin; Aktaş, Emel; Ülengin, Füsun; Önsel Ekici, Şule; Kabak, Özgür (WCTRS, 2010-07)Supply Chain Management is a management philosophy developed after realizing the necessity of coordinating the firms in order to increase profitability and survive in the market under the circumstances of rough and rapidly ... -
Connecting logistics performance to export : a scenario-based approach
Kabak, Özgür; Ülengin, Füsun; Önsel Ekici, Şule (Elsevier, 2018)We propose a novel scenario analysis-based approach to investigate the relationship between logistics performance and exports at a country level. Different from the existing scenario analysis methods that contain subjectivity ... -
Critical success factors for the iron and steel industry in Turkey: A fuzzy DEMATEL approach
Kabak, Özgür; Ülengin, Füsun; Çekyay, Bora; Önsel, Şule; Özaydın, Özay (Springer, 2016-06)The attempt to improve the efficiency and competitiveness of an industrial sector is aided by the determination of critical success factors (CSFs) which focus efforts in those areas that really affect the whole industry, ... -
Cumulative belief degrees approach for analyzing the competitiveness of the automotive industry
Kabak, Özgür; Ülengin, Füsun; Önsel Ekici, Şule; Özaydın, Özay; Aktaş, Emel (Elsevier, 2014-11)As traditional competition becomes global, businesses fail to take, on their own, the measures that are required to become more competitive. Hence, in a globally competitive environment, national improvement and competitiveness ... -
A decision support methodology to enhance the competitiveness of the Turkish automotive industry
Ülengin, Füsun; Önsel Ekici, Şule; Aktaş, Emel; Kabak, Özgür; Özaydın, Özay (Elsevier, 2014-05-01)Three levels of competitiveness affect the success of business enterprises in a globally competitive environment: the competitiveness of the company, the competitiveness of the industry in which the company operates and ... -
A decision support system to evaluate the competitiveness of nations
Önsel Ekici, Şule; Ülengin, Füsun; Ulusoy, Gündüz; Kabak, Özgür; Topçu, Yusuf İlker; Aktaş, Emel (WSEAS Press, 2007-12-29)The aim of this chapter is to explore methodological transparency as a viable solution to problems created by existing aggregated indices as well as to conduct a detailed analysis on the ongoing performance of nations’ ... -
A decision support system to evaluate the competitiveness of nations
Önsel Ekici, Şule; Ülengin, Füsun; Ulusoy, Gündüz; Kabak, Özgür; Topçu, Yusuf İlker; Aktaş, Emel (Springer, 2009-05-29)The aim of this chapter is to explore methodological transparency as a viable solution to problems created by existing aggregated indices as well as to conduct a detailed analysis on the ongoing performance of nations’ ... -
A demand forecasting methodology for fuzzy environments
Kabak, Özgür; Ülengin, Füsun (Graz University of Technology, Institut für Informationssysteme und Computer Medien, 2010)Several supply chain and production planning models in the literature assume the demands are fuzzy but most of them do not offer a specific technique to derive the fuzzy demands. In this study, we propose a methodology to ... -
Effects of quotas on Turkish foreign trade: A gravity model
Ülengin, Füsun; Çekyay, Bora; Toktaş Palut, Peral; Ülengin, Burç; Kabak, Özgür; Özaydın, Özay; Önsel Ekici, Şule (Elsevier, 2015-02)Turkey's role as a world trade participant has grown in recent years, particularly as the country is capitalizing more on its unique geopolitical position. Given the important trade volume and rooted relations between ... -
Efficient shift scheduling in the retail sector through two-stage optimization
Kabak, Özgür; Ülengin, Füsun; Aktaş, Emel; Önsel Ekici, Şule; Topcu, Yusuf İlker (Elsevier, 2008-01-01)Efficient workforce scheduling has an important impact on store profit and customer service. Standard scheduling problem lems do not recognize the effect of staff availability on customer sales, however, even though the ... -
The evaluation of electricity generation resources : the case of Turkey
Topcu, İlker; Ülengin, Füsun; Kabak, Özgür; Işık, Mine; Ünver, Berna; Önsel Ekici, Şule (Elsevier, 2019)Electricity is the rising force among worldwide end-uses of energy. To meet the increasing demand, accurate policy decisions should be made considering each country's own dynamics. In fact, the selection of appropriate ... -
Improving logistics performance by reforming the pillars of Global Competitiveness Index
Kabak, Özgür; Ülengin, Füsun; Önsel Ekici, Şule (Elsevier, 2019)The logistics performance of a country is crucial to national and international trade, and therefore has a direct effect on economic development. Owing to limited resources, policymakers need a guide for specifying the ...
