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TEDARİK ZİNCİRLERİNDE ERTELEME STRATEJİLERİNİN ANALİZİ

ANALYSIS OF POSTPONEMENT STRATEGIES IN SUPPLY CHAINS

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Abstract (2. Language): 
Inventory is an important part of supply chain management as it directly impacts both cost and service. As demand is more or less uncertain and it takes time to manufacture and deliver the goods, some amount of inventory is required somewhere in the chain to provide the required service to the end customer. Increasing supply chain inventories increases customer service and consequently the revenue, but it comes at a higher cost. The aim of supply chain inventory management is to optimize the inventories and to shift the current customer service curve outwardthrough improved inventory strategies and redesigning the supply chain. This article is aimed at studyingthe effectiveness of various factors in the supplychain environment with and without postponement strategies. Analysis of these factors enables a better understanding of the supply chains and will help todesign these systems more effectively. Simulation models are developed using Arena and are used to capture the system dynamics with probability distribution which provides valuable insight into which variables are the most important and how variables interact. It also helps to capture the uncertainty and stochastic nature of the model. Two-level Fractional Factorial Experimental designs are used to study and analyze the performance of service and inventory levels and to determine which variables are the most influential.
Abstract (Original Language): 
Envanter hem maliyeti hem de servis kalitesini doğrudan etkilediğinden tedarik zinciri yönetiminin önemli bir parçasını oluşturur. Talep bir ölçűde belirsiz olduğu ve űrűnlerin űretimi ve teslimi belli bir zaman aldığı için, tedarik zincirinde bir miktar envanter bulundurmak műşteriye gerekli servisi verebilmek için gereklidir. Tedarik zincirindeki envanteri artırmak műşteri hizmetini artırarak sonunda gelirleri de artırır; ancak envanter daha bűyűk bir maliyet te gerektirir. Tedarik zinciri envanter yönetiminin amacı daha gelişmişenvanter stratejileri ve tedarik zincirinin yeniden tasarlanması yoluyla envanter miktarlarını ve műşteri hizmetleri eğrisini eniyilemektir. Bu makalenin amacı tedarik zinciri ortamında çeşitli faktörlerin ertelemenin olduğu veya olmadığı hallerde etkinliğini anlamaktir. Bu faktörlerin analizi bizim tedarik zincirlerini dahaiyi anlamamızı ve bu sistemleri daha etkin bir sekilde tasarlamamızı sağlayacaktır. Arena yazılım programı kullanılarak geliştirilen ve sistem dinamiğini ve olasılık dağılımlarını modelleyen benzetim programı yoluyla hangi değişkenlerin önemli olduğu ve bu değişkenlerin aralarındaki etkileşimin nasıl olduğu yolunda daha iyi bir anlayışa sahip olunmuştur. ĺki seviyeli kısmi faktöriyel deney tasarımları kullanılarak servis ve envanter seviyelerinin performansı ve hangi değişkenlerin bu performans űzerinde en fazla etkili olduğu araştırılmıştır.
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