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TR-Dizin İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://gcris.yasar.edu.tr/handle/123456789/11291

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    Article
    Citation - WoS: 33
    Citation - Scopus: 36
    Antecedents to supply chain innovation
    (EMERALD GROUP PUBLISHING LTD, 2020-02-10) Fatma Nur Karaman Kabadurmus; Kabadurmus, Ozgur; Karaman Kabadurmus, Fatma Nur; Kabadurmuş, Fatma Nur Karaman
    Purpose The purpose of this study is to examine organizational and environmental (competition capital scarcity and organization of labor) factors that affect firms' innovation activities within the supply chain. Design/methodology/approach This study empirically examines the factors that affect firms' innovation activities using firm-level data from the last round of Business Environment Enterprise Performance Surveys (BEEPS). The analysis covers major supply chain functions: production delivery and support systems. Findings The study shows that drivers of innovation vary with the type of innovation activity, as such innovation efforts across supply chain functions should prioritize strategic resources that will create competitive advantages. Our results also reveal that sustainability efforts in the Eastern Europe and Central Asia (EECA) region should prioritize labor market reforms over capital market reforms. Originality/value Current research on innovation and supply chain issues does not explicitly analyze innovations that occur in different sustainable supply chain functions and empirical studies that focus on the determinants of innovations in the supply chain network are very limited. The data used in this study cover 30 economies in EECA many of which are low- and middle-income countries and thus contribute to the implementation of sustainable practices in developing countries.
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    Article
    Citation - WoS: 3
    Citation - Scopus: 5
    Mathematical models for the periodic vehicle routing problem with timewindows and time spread constraints
    (Ramazan Yaman, 2020-09-10) Damla Kizilay; Hande Öztop; Zeynel Abidin ÇİL; Kizilay, Damla; Öztop, Hande; Çil, Zeynel Abidin
    The periodic vehicle routing problem (PVRP) is an extension of the well-knownvehicle routing problem. In this paper the PVRP with time windows and timespread constraints (PVRP-TWTS) is addressed which arises in the high-valueshipment transportation area. In the PVRP-TWTS period-specific demands of thecustomers must be delivered by a fleet of heterogeneous capacitated vehicles overthe several planning periods. Additionally the arrival times to a customer shouldbe irregular within its time window over the planning periods and the waiting timeis not allowed for the vehicles due to the security concerns. This study proposes novel mixed-integer linear programming (MILP) and constraint programming(CP) models for the PVRP-TWTS. Furthermore we develop several validinequalities to strengthen the proposed MILP and CP models as well as a lowerbound. Even though CP has successful applications for various optimizationproblems it is still not as well-known as MILP in the operations research field.This study aims to utilize the effectiveness of CP in solving the PVRP-TWTS. This study presents a CP model for PVRP-TWTS for the first time in the literature to the best of our knowledge. Having a comparison of the CP and MILP models can help in providing a baseline for the problem. We evaluate the performance ofthe proposed MILP and CP models by modifying the well-known benchmark setfrom the literature. The extensive computational results show that the CP modelperforms much better than the MILP model in terms of the solution quality. 4