INVENTORY CONTROL IN A TWO-STAGE GREEN SUPPLY CHAIN

Öz

Recycling, remanufacturing and repair processes increase the profitability of companies by providing less energy use and less waste generation, and have a positive effect on the total cost of the supply chain. In the present study, an integrated inventory model, which considers economic and environmental objectives together, was developed for a two-level supply chain system consisting of a single manufacturer and a single retailer located in different countries. The problem is the simultaneous calculation of the manufacturer's number of shipments and the buyer's shipment sizes, that is, the parameters of the integrated production-inventory policy, to minimize the total cost of the system. Each batch the retailer received contains both good quality products and defective products. Some of the defective products are scrapped and sent back to the manufacturer to enter the recycling/remanufacturing process, while the other part is added to the inventory after being repaired at a local company. The carbon emission costs of transporting products from manufacturer to retailer and defective products from retailer to manufacturer and repair center were included in the model. Our aim was to model the joint effects of outsourcing repair, recycling/remanufacturing, and carbon emissions on supply chain performance. Theoretical results were obtained with the help of a numerical example and sensitivity analysis was carried out. Numerical analysis showed that the repair process together with the recycling/remanufacturing process has a positive effect on the total inventory cost of the supply chain.

Anahtar Kelimeler

• Repair
• Recycling
• Remanufacturing
• Carbon emissions
• Mathematical Model

İKİ AŞAMALI YEŞİL BİR TEDARİK ZİNCİRİNDE STOK KONTROLÜ

Öz

Geri dönüşüm, yeniden üretim ve tamir işlemleri, daha az enerji kullanımı ve daha az atık oluşumunu sağlayarak işletmelerin karlılığını artırmaktadır ve tedarik zinciri toplam maliyeti üzerinde olumlu yönde etki yapmaktadır. Bu çalışmada, farklı ülkelerde bulunan tek bir üretici ve tek bir perakendeciden oluşan iki aşamalı tedarik zinciri sistemi için ekonomik ve çevresel hedefleri birlikte gözeten bir bütünleşik stok kontrol modeli geliştirilmektedir. Bu çalışmadaki problem, sistemin toplam stok maliyetini enküçükleyecek şekilde üreticinin parti sayısının ve perakendecinin parti büyüklüğünün, yani bütünleşik üretim-stok kontrol politikası parametrelerinin birlikte hesaplanmasıdır. Perakendecinin teslim aldığı her parti iyi kaliteli ürünlerle birlikte kusurlu ürünler de içermektedir. Kusurlu ürünlerin bir kısmı hurdaya ayrılmakta ve geri dönüşüm/yeniden üretim sürecine girmek üzere üreticiye geri gönderilmektedir, diğer kısmı ise yerel bir firmada tamir edildikten sonra eldeki stoğa eklenmektedir. Ürünlerin üreticiden perakendeciye ve kusurlu ürünlerin perakendeciden üreticiye ve tamir merkezine taşınmasından kaynaklanan karbon emisyon maliyetleri modele dahil edilmiştir. Bu çalışmadaki amaç, dışkaynak tamir, geri dönüşüm/yeniden üretim ve karbon emisyonunun birlikte tedarik zinciri performansı üzerindeki etkisini modellemektir. Sayısal bir örnek yardımıyla teorik sonuçlar elde edilmiş ve duyarlılık analizleri verilmiştir. Sayısal analiz sonucunda, tamir işleminin geri dönüşüm/yeniden üretim işlemiyle birlikte tedarik zinciri toplam stok maliyeti üzerinde olumlu yönde etkisinin olduğu gözlemlenmiştir.

Anahtar Kelimeler

• Tamir
• Geri dönüşüm
• Yeniden üretim
• Karbon emisyonu
• Matematik model

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