Investigation of Inventory Control of Remanufacturing Systems with Goal Programming and Analytic Hierarchy Process (AHP)

Year 2019, Volume: 21 Issue: 4, 1230 - 1245, 30.12.2019

Talip Arsu , Ali Özdemir

https://doi.org/10.32709/akusosbil.518293

Cited By: 1

Abstract

Companies
that prioritize the benefit have to set some realistic goals that will bring
them success in the long run, taking advantage of their past experience. There
are many uncertainties to face when setting these goals and many constraints
that the companies must take into account. In this uncertainty environment, it
is necessary to satisfy the realistic goals set by the companies and to shape
its future in the light of this information. This is also possible with Goal
Programming, one of the Multi-Objective Decision Making (MODM) methods. In this
study, a three-period inventory control policy for three products in a company,
which operating in the automotive spare parts sector, from the product
portfolio is modeled and solved with goal programming. Analytical Hierarchy
Process (AHP), one of the Multi-Attribute Decision Making (MADM) methods, was
used to calculate the objective function coefficients of the Goal Programming
model. Three of the five main goals (the goal of minimizing total stocking
cost, the goal of maximizing net profit and the goal of minimizing overtime
production costs) in the proposed model were achieved without any positive or
negative deviation. The other two main goals (the goal of not exceeding the
periodical storage capacity and the goal of meet the demand for periodical
products) have positive or negative deviations. However, in general, the
company, which successfully satisfies many of its objectives, is partially
successful. In addition, the goal programming model proposed in this study
successfully satisfy the inventory control policy objectives of the enterprise.
The values obtained as a result of the solution are compared with the goals set
by the company.

Keywords

Stock Management, reverse logistics, remanufacturing, goal programming, Analytic Hierarchy Process (AHP)

Hedef Programlama ve Analitik Hiyerarşi Prosesi (AHP) ile Yeniden Üretim Sistemlerinin Stok Kontrolünün İncelenmesi

Abstract

Faydayı ön planda tutan işletmeler, geçmiş deneyimlerinden yararlanarak
kendilerine uzun vadede başarıyı getirecek olan bazı gerçekçi hedefler koymak
zorundadır. Bu hedefleri koyarken karşılaşılacak birçok belirsizlik ve işletmelerin
göz önünde bulundurması gereken birçok kısıt vardır. İşte bu belirsizlik
ortamında işletmenin koyduğu gerçekçi hedefleri doyuma ulaştırması ve bu
bilgiler ışığında geleceğini şekillendirmesi gerekmektedir. Bu da Çok Amaçlı
Karar Verme (ÇAKV) metotlarından Hedef Programlama ile mümkündür. Bu çalışmada
otomotiv yedek parça sektöründe faaliyet gösteren bir işletmenin yeniden üretim
sistemi ürün portföyünden, üç ürün için üç dönemlik stok kontrol politikası
hedef programlama ile modellenmiş ve çözülmüştür. Hedef Programlama modelinin
amaç fonksiyonu katsayıları hesaplanırken Çok Nitelikli Karar Verme (ÇNKV)
metotlarından Analitik Hiyerarşi Prosesi (AHP) kullanılmıştır. Önerilen
modeldeki beş ana hedeften üç tanesi (toplam stoklama maliyetini minimize etme
hedefi, net karı maksimize etme hedefi ve fazla mesai ile gerçekleştirilen
üretim maliyetini minimize etme hedefi) herhangi bir pozitif veya negatif sapma
meydana gelmeden başarılmıştır. İki hedefte (dönemlik stoklama kapasitesini
aşmama hedefi ve dönemlik ürün talebini karşılama hedefi) ise pozitif veya
negatif sapmalar meydana gelmiştir. Fakat genel olarak birçok hedefini
başarıyla doyuma ulaştıran işletme kısmen başarılı bir seyir izlemektedir.
Ayrıca bu çalışmada önerilen hedef programlama modeli işletmenin stok kontrol
politikası hedeflerini başarılı br şekilde doyuma ulaştırmıştır. Çözüm
sonucunda ulaşılan değerler ile işletmenin kendisine koyduğu hedefler
karşılaştırılarak yorumlanmıştır.

Keywords

Stok Yönetimi, tersine lojistik, yeniden üretim, hedef programlama, Analitik Hiyerarşi Prosesi (AHP)

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