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Belirsiz Talep ve Geri Dönen Ürünler Durumunda Yeniden Üretim İle Üretim Planlaması

PRODUCTION PLANNING WITH REMANUFACTURING UNDER UNCERTAIN DEMAND AND RETURNS

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Abstract (2. Language): 
In this study, a production planning problem in which a producer remanufactures returned products into serviceable products besides manufacturing serviceable products is considered. The main challenge in this planning problem is the uncertain demand for the serviceable products and the uncertain returns of the used products. The probability distributions of the uncertain demand and uncertain returns are not known. Only the means of uncertain parameters and maximum deviations from these means are known or can be estimated. The problem is to determine the quantity of serviceable products that are manufactured, the quantity of returned products that are remanufactured, and the quantity of returned products that are disposed over a multi-period planning horizon such that total cost composed of production, inventory and disposal costs is minimized. A new robust linear programming model that yields a feasible production-disposal policy regardless of the realization of demand and returns is proposed and compared with a robust linear programming model existing in the literature. The computational results reveal that the proposed model significantly outperforms the one existing in literature in terms of the actual cost savings.
Abstract (Original Language): 
Bu çalışmada, bir üreticinin satılabilir ürünleri üretmesi yanında, geri dönen ürünleri yeniden üreterek satılabilir ürünlere dönüştürdüğü bir üretim planlama problemi ele alınmıştır. Bu planlama problemindeki en büyük zorluk, satılabilir ürünler için talebin belirsiz olması ve geri dönen ürün miktarlarındaki belirsizliktir. Belirsiz talep ve geri dönen ürün miktarlarındaki belirsizliğin olasılıksal dağılımları bilinmemektedir. Bu belirsiz parametrelerin sadece ortalamaları ve bu ortalamalardan azami sapmaları bilinmekte veya tahmin edilebilmektedir. Problem, toplam üretim, envanter ve imha maliyetlerini enazlayacak şekilde, planlama ufku boyunca, üretilecek satılabilir ürünlerin miktarının, yeniden üretilecek geri dönen ürünlerin miktarının ve imha edilecek geri dönen ürünlerin miktarının belirlenmesidir. Talep ve geri dönen ürün miktarlarının gerçekleşmelerinden bağımsız olarak, olurlu bir üretim-imha politikası veren, yeni bir gürbüz doğrusal programlama modeli önerilmekte ve literatürde varolan bir gürbüz doğrusal programlama modeli ile karşılaştırılmaktadır. Sayısal sonuçlar, önerilen modelin, literatürde varolan modelden gerçek maliyet tasarrufu olarak önemli derecede üstün olduğunu göstermektedir.
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