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Belirsizlik Altında Üretim Planlaması Problemi için Robust Eniyileme Modeli

Robust Optimization Model for Production Planning Problem under Uncertainty

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Abstract (2. Language): 
Conditions of businesses change very quickly. To take into account the uncertainty engendered by changes has become almost a rule while planning. Robust optimization techniques that are methods of handling uncertainty ensure to produce less sensitive results to changing conditions. Production planning, is to decide from which product, when and how much will be produced, with a most basic definition. Modeling and solution of the Production planning problems changes depending on structure of the production processes, parameters and variables. In this paper, it is aimed to generate and apply scenario based robust optimization model for capacitated two-stage multi-product production planning problem under parameter and demand uncertainty. With this purpose, production planning problem of a textile company that operate in İzmir has been modeled and solved, then deterministic scenarios’ and robust method’s results have been compared. Robust method has provided a production plan that has higher cost but, will result close to feasible and optimal for most of the different scenarios in the future.
Abstract (Original Language): 
İşletmelerin içinde bulundukları şartlar oldukça hızlı bir şekilde değişmektedir. Planlama yapılırken değişimin doğurduğu belirsizliği hesaba katmak adeta bir kural haline gelmiştir. Belirsizliği ele alma yöntemlerinden olan robust eniyileme teknikleri, değişen koşullara daha az duyarlı sonuçlar üreten modellerin oluşturulmasını sağlamaktadır. Üretim planlaması en basit anlamda hangi üründen, ne zaman, ne kadar üretileceğine karar verilmesidir. Üretim planlama problemlerinin modellenmesi ve çözümü üretim sürecinin, ele alınan parametrelerin ve değişkenlerin yapısına bağlı olarak farklılık göstermektedir. Bu çalışmada parametre ve talep belirsizliği altında, kapasite kısıtlı iki aşamalı, çok ürünlü üretim planlaması problemi için eniyileme modelinin oluşturulması ve çözülmesi amaçlanmıştır. Bu amaçla İzmir’de faaliyet gösteren bir tekstil firmasının üretim planlama problemi modellenerek çözülmüş, robust modelin sonuçları ile deterministik senaryoların sonuçları karşılaştırılmıştır. Robust yöntem, daha yüksek maliyetli ancak gelecekte karşılaşılabilecek farklı senaryoların çoğunluğunda büyük ölçüde olurlu ve optimale yakın sonuçlar verecek, sağlam bir üretim planı sunmuştur.
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REFERENCES

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