Ekonomik Sipariş Miktarı Modellerinde Talebin Kısmen Ertelenmesi ve Bir Uygulama

Yıl 2019, Cilt: 26 Sayı: 1, 11 - 32, 19.03.2019

Harun Sulak Abdullah Eroğlu Ahmed Adnan Hafedh Algburi

https://doi.org/10.18657/yonveek.508931

Cited By: 1

Öz

Ekonomik
Sipariş ve Üretim Miktarı modelleri stok kontrol modelleri içerisinde en yaygın
kullanılanlarıdır. Basit ve kullanışlı olan bu modeller katı varsayımlar
içerdiğinden gerçek hayatta ortaya çıkan problemlere cevap vermekte yetersiz
kalmaktadır. Bu nedenle, bu modellerde yer alan varsayımlara ilave varsayımlar
eklenmesi yahut mevcut varsayımların gevşetilmesi yoluyla yeni modeller
geliştirilmektedir. Gelen siparişin defolu ürün içermemesi, ödemelerde
gecikmeye ve stoksuzluğa (talebin
ertelenmesine) izin verilmemesi bu modellerde yer alan temel katı
varsayımlardandır. Bu varsayımlar esnetilerek geliştirilen pek çok yeni model
vardır. Bu çalışmada önceki çalışmalardan farklı olarak özellikle stoksuzluk
durumunda talebin bir kısmının bir sonraki dönem karşılanmak üzere ertelenmesi
durumunu defolu ürün ve ödemelerde belli bir süre gecikmeye izin verilmesi
durumu ile birlikte ele alan bir ekonomik sipariş miktarı önerilmektedir.

Çalışma
üç bölümden oluşmaktadır. Birinci bölümde talebin kısmen ertelenmesi yani kısmi
stoksuzluk durumu, gelen siparişin defolu ürün içermesi ve ödemelerde gecikmeye
izin verilmesi durumu açıklanmakta ve bu alanda yapılan çalışmalar
özetlenmektedir. İkinci bölümde karşılanamayan talebin kısmen ertelenmesi
durumunu ele alan yeni bir ekonomik sipariş miktarı modeli önerilmektedir. Bu
bölümde matematiksel modelin elde edilmesi, önceki çalışmaların önerilen
modelin özel durumu olduklarının gösterilmesi ve modelle ilgili nümerik
örnekler yer almaktadır. Üçüncü bölümde ise model parametrelerinin optimal
değerler üzerindeki etkileri duyarlılık analizi ile incelenmektedir. Özellikle
optimal sipariş miktarı ve toplam kârdaki değişimler ayrıntılı olarak ele alınmaktadır.
Analiz sonuçlarına göre talebin erteleme oranının optimal sipariş miktarı ve
toplam kâr üzerinde anlamlı bir etkisinin olmadığı görülmüştür. Diğer taraftan
ödemelerde izin verilen gecikme süresi arttıkça ve defolu ürün oranı azaldıkça
optimal sipariş miktarı azalmış, toplam kâr ise artmıştır. 

Anahtar Kelimeler

Ekonomik sipariş miktarı, Ödemelerde gecikme, Defolu ürün, Stoksuzluk, Kısmi erteleme

Kaynakça

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