SUPPLIER SELECTION AMONG DIFFERENT SCALE CONSTRUCTION COMPANIES USING FUZZY AHP AND FUZZY TOPSIS

Öz

Supplier selection is an important strategic decision for construction companies due to long-term project durations and high costs. In the construction sector, supplier selection decisions should take several criteria and alternatives into account. Along with the high number of alternative suppliers, choosing the best method to evaluate the alternative suppliers is another critical step. In this study, we compare the effectiveness of different multi-criteria decision‐making methods for selecting the most convenient supplier for construction companies. In this respect, we study the integration of powerful multi-criteria decision‐making methods, Fuzzy Analytic Hierarchy Process (AHP) and Fuzzy Technique for Order Preference by Similarity to Ideal Solution (TOPSIS). We use Fuzzy AHP for the calculation of decision criteria weights, and then we apply Fuzzy TOPSIS for ranking the alternatives. Several interviews were made with the experts at construction companies and as a result of those interviews, 7 main criteria and 24 sub-criteria for comparing alternative suppliers of the companies were determined. We test our approach for two construction companies and use an integrated Fuzzy AHP and Fuzzy TOPSIS method to find the best supplier for the selected criteria. The contribution of this study is not limited to the multi-criteria decision-making methods for the supplier selection problem in the construction sector, but also we make a comparison of the supplier selection decisions of two different sized companies having the same supplier pool, and we show the effect of company based criteria weights in supplier selection.

Anahtar Kelimeler

• : Fuzzy AHP
• Fuzzy TOPSIS
• Supply Chain

Farklı büyüklükteki İnşaat Firmaları için Bulanık AHP ve Bulanık TOPSIS Yöntemleriyle Tedarikçi Seçimi

Öz

İnşaat firmaları için tedarikçi seçimi, uzun dönemli proje süreleri ve yüksek maliyetler açısından stratejik bir karardır. İnşaat sektöründe tedarikçi seçimi yapılırken pek çok kriter ve alternatif dikkate alınmalıdır. Alternatif tedarikçilerin sayısının fazla olmasının yanı sıra alternatif tedarikçileri kıyaslamak çin en iyi metodun seçimi de kritik bir karardır. Bu çalışmada, inşaat firmaları için en iyi tedarikçiyi seçme sürecinde farklı çok kriterli karar verme metotlarının etkinliğini kıyaslamaktayız. Bu nedenle, çok kriterli karar verme problemi çözümünde oldukça etkili olduğu bilinen bulanık AHP ve bulanık TOPSIS metotlarının entegrasyonunu incelemekteyiz. Bulanık AHP metodu ile kriter ağırlıklarını hesaplayıp bulanık TOPSIS metodu ile alternatifleri sıralamaktayız. İnşaat sektöründeki çok sayıda uzman ile yaptığımız görüşmeler sonucunda inşaat firmalarının tedarikçilerinin seçimi için 7 ana ve 24 alt kriter belirlenmiştir. Yaklaşımımızı iki inşaat firması için belirlenen kriterlere göre en iyi tedarikçiyi seçmek için bulanık AHP ve bulanık TOPSIS metotlarını bütünleşik olarak kullanıp test etmekteyiz. Bu çalışmanın literatüre katkısı sadece çok kriterli karar verme metotlarının inşaat sektöründe uygulanmasıyla sınırlı olmayıp aynı zamanda aynı tedarikçi havuzunu kullanan farklı ölçekteki iki inşaat firmasının tedarikçi seçimleri kıyaslanmakta ve firmalara göre belirlenen kriter ağırlıklarının tedarikçi seçimine etkisi gösterilmektedir.

Anahtar Kelimeler

• Bulanık AHP
• Bulanık TOPSIS
• Tedarik Zinciri

Kaynakça

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