Yazar "Tanyas, Mehmet" seçeneğine göre listele

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    Blockchain applications for traceability and food safety in agri-food supply chain: cherry product application
    (Emerald Group Publishing Ltd, 2023) Indap, Sebnem; Tanyas, Mehmet
    Purpose - The primary objective of this study is to investigate the application of blockchain technology (BCT) in the agri-food supply chain, focusing on traceability and food safety. Design/methodology/approach - The study employed a semi-structured interview method with representatives from the cherry supply chain to evaluate their awareness and acceptance of BCT's impact. Additionally, the analytic hierarchy process (AHP) was utilized to determine digital investment priorities in supply chain strategies. By applying the supply chain operations reference (SCOR) model framework to the cherry supply chain, the study aimed to address the question Which process model is suitable for implementing BCT in the agri-food supply chain? Findings - The global agri-food supply chains are characterized by significant food losses, escalating prices along the chain, and food safety risks. Concurrently, consumer concerns regarding food safety, quality and transparency are on the rise. BCT, with its ability to ensure data integrity, immutability, and seamless tracking of chain movements, presents immense potential as a secure infrastructure in the agri-food supply chain traceability. Originality/value - The developed analytic framework and the study's findings can be adapted to different sectors and different sub-sectors within agri-food supply chains.
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    The Contribution of Transport Modes to Carbon Emissions in Turkey
    (Routledge, 2023) Shahbaz, Muhammad; Bayat, Tuğrul; Tanyas, Mehmet
    [Abstract Not Available]
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    Determining the size and design of flow type and u-type warehouses
    (ELSEVIER SCIENCE BV, 2012) Cakmak, Emre; Gunay, Noyan Sebla; Aybakan, Gulsah; Tanyas, Mehmet; Ozsahin, M; Zehir, C
    Nowadays, fluctuations of costs and costumer demands make it harder for firms to respond the market conditions effectively and cause customer and profit loss. In modern supply chain process, products must be delivered to customers in the shortest possible delivery time and this delivery time must be procured with a minimum number of stocks. Distribution for small amounts of products in a wide variety must be more frequently and more rapidly. This time constraint has a direct impact on the distribution and warehousing management. Although the importance of warehouses is emphasized in the literature, determining the size of warehouses is not mentioned enough. In this context, determining the size for a new flow type warehouse and a new u-type warehouse has been tried in this paper. A warehouse design which minimizing the total picker distance has been studied analytically with taking the number of doors into account. As a result of the calculations, different interior layouts have been proposed for the flow type warehouses and u-type warehouses. (C) 2012 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of the 8th International Strategic Management Conference
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    FRUITS AND VEGETABLES MARKET HALL LOCATION SELECTION BY USING INTERVAL-VALUED TRAPEZOIDAL FUZZY GREY RELATIONAL ANALYSIS: AN APPLICATION FOR ISTANBUL
    (Univ Cincinnati Industrial Engineering, 2019) Bilisik, O. N.; Tuzkaya, Umut Rifat; Baracli, Hayri; Tanyas, Mehmet
    In urban areas, effectively delivering the necessary products for people to survive to the desired points has vital importance. Selecting the locations of urban distribution centers correctly, which have an essential role in distribution networks, will satisfy determining the number of vehicles, minimizing the traffic congestion by determining the routes of vehicles correctly and thus decreasing the environmental effects like noise and emission. In this study, location selection problem for fresh fruits and vegetables market hall (F&VMH) which is an important urban distribution center type that fulfills the food requirements of city residents is examined. The interval-valued trapezoidal fuzzy grey relational analysis (GRA) method is used to solve this problem because, it is suitable to deal with poor, incomplete, and uncertain information. When the results are analyzed, it is seen that F&VMHs have to be located in the district which is closer to producers and which has the lower construction and land costs.
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    Identifying Logistics Requirements for Enterprise Interoperability and Collaboration: A European Project Case
    (INT ASSOC ENGINEERS-IAENG, 2011) Buyukozkan, Gulcin; Arsan, Leyla; Tanyas, Mehmet; Kagnici, Aslihan; Ao, SI; Gelman, L; Hukins, DWL; Hunter, A; Korsunsky, AM
    The logistics industry is one of the several domains addressed by the COIN (Enterprise Collaboration and Interoperability) European Project. The main goal of the COIN Project is to provide an Evolutionary and Pervasive Service Platform, realizing a collaborative Digital Ecosystem that allows providers of business services to publish their offers, and potential customers to easily locate themselves and access the services that best suit their needs. In this paper, we position the COIN service platform as a technology enabler for developing and offering collaboration and interoperability services for the logistics domain.
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    Joint selection of customs broker agencies and international road transportation firms by a fuzzy analytic network process approach
    (PERGAMON-ELSEVIER SCIENCE LTD, 2011) Ozgen, Arzum; Tanyas, Mehmet
    This paper considers a special case for logistics activities in Turkey: a joint selection of customs broker agency and international road transportation firm. For this purpose a decision-making team has been constituted, including members of logistics and finance departments and an academic. They determined related quantitative and qualitative criteria for the selection process. To cover the vagueness of related qualitative data, a fuzzy analytic network process (FANP) based model was formulated and applied to the decision-making process. The FANP model encompasses and substantially resolves the ambiguity and imprecision of the pairwise comparison process. By using the proposed FANP structure, the joint selection problem could be solved in a much easier way by also considering the inter-dependencies related to criteria. (C) 2011 Elsevier Ltd. All rights reserved.
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    Layout of Urban Distribution Center Using Possibilistic Programming
    (ATLANTIS PRESS, 2016) Demirtas, Nurgul; Tuzkaya, Umut R.; Tanyas, Mehmet
    Distribution centers, link supply chain to the customers. Layout of the distribution centers is very important in terms of product conservation at the required service level and delivering of products with minimum cost to the customer from distribution centers. Therefore, the layout design of distribution centers should be handled with a smart decision system. In this study, the layout design of a fruits and vegetable hall, which is a kind of urban distribution center, is investigated for two different scenarios: (1) assignments of the brokers to the stores and (2) assignments of the products to the stores. The study suggests the most suitable allocation models for the inner layout of distribution center. In the first phase, the requirements of the mathematical model to develop the decision making system for the layouts of distribution center that will be determined. In the second phase, allocation models will be developed and solved for fruits and vegetables halls in Istanbul.
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    Logistics center site selection by ANP/BOCR analysis: A case study of Turkey
    (IOS PRESS, 2016) Peker, Iskender; Baki, Birdogan; Tanyas, Mehmet; Ar, Ilker Murat
    Site selection for logistics centers is one of the most strategic decisions in logistics. This study addresses the problem of logistics center site selection, using Analytic Network Process/Benefits, Opportunities, Costs and Risks, which is a multi-criteria decision making technique. The decision problem is applied to the city of Trabzon, which is an important city of the Eastern Black Sea Region in Turkey. First, the results are evaluated in terms of each sub-network and each group and, next, are consolidated for each alternative. They yield that Alternative A is the most appropriate logistics center location of all in Trabzon. Furthermore, the sensitivity analysis results emphasize that the decision model is robust.
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    A SCOR based approach for measuring a benchmarkable supply chain performance
    (SPRINGER, 2013) Kocaoglu, Batuhan; Gulsun, Bahadir; Tanyas, Mehmet
    Performance measurement can only help to identify the problems existing in the current supply chain, while it is helpless in exploring the root causes of these problems and thus choosing corresponding actions to improve supply chain performance. The conflict between the top-down strategy decomposition and the bottom-up implementation process is serious. Therefore, in order to overcome the above issues, it is very necessary to link strategic objectives to operations, which could help managers, especially those operating at a strategic level, to know more operational mechanism of supply chains. In this study, an integrated approach which employs analytic hierarchy process (AHP) and technique for order preference by similarity to ideal solution (TOPSIS) together is proposed for the linking strategic objectives to operations. Supply chain operations reference model is used to model the linkage of the strategic objectives and operational metrics in a hierarchical way. The AHP is used to analyze this metric hierarchy and determine weights of the metrics, and TOPSIS method is used to make a normalization of metric values having different units, so a comparison will be available. Proposed approach is applied to a problem of decision making process in a manufacturing company. Company managers found the application and results satisfactory and implementable in their decisions.
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    A Weighted Multiobjective Optimization Method for Mixed-Model Assembly Line Problem
    (HINDAWI PUBLISHING CORPORATION, 2013) Seker, Sukran; Ozgurler, Mesut; Tanyas, Mehmet
    Mixed-model assembly line (MMAL) is a type of assembly line where several distinct models of a product are assembled. MMAL is applied in many industrial environments today because of its greater variety in demand. This paper considers the objective of minimizing the work overload (i.e., the line balancing problem) and station-to-station product flows. Generally, transportation time between stations are ignored in the literature. In this paper, Multiobjective Mixed-Integer Programming (MOMIP) model is presented to optimize these two criteria simultaneously. Also, this MOMIP model incorporates a practical constraint that allows to add parallel stations to assembly line to decrease higher station time. In the last section, MOMIP is applied to optimize the cycle time and transportation time simultaneously in mixed-model assembly line of a real consumer electronics firm in Turkey, and computational results are presented.