ÇOKLU DEPOLARDA RAF ATAMA PROBLEMİ İÇİN MATEMATİKSEL VE SEZGİSEL ÇÖZÜM YAKLAŞIMLARI

Year 2019, Volume: 30 Issue: 1, 63 - 74, 16.09.2019

Zehra Kamışlı Öztürk , Emine Akyol Özer , Çisem Gülen Ayşenur Çiçek Mehmet Deniz Serttaş

Abstract

Tedarik zincirinin en önemli unsurlarından biri depolardır. Etkili depo
düzeni, müşteriye teslimat süresini ve depolama maliyetini azaltır. Bu
çalışmada, birden fazla depo ve heterojen hammadde içeren seramik fabrikasında
depo yerleşim problemi tartışılmıştır. Sorunun çözümü için çok amaçlı bir karma
tamsayılı matematiksel model önerilmiştir. Modelin ilk amacı, hammadde öncelik
katsayılarını göz önünde bulundurarak hammaddeleri raflara atayarak, iki depo
ve dört fabrika arasındaki taşıma mesafesini en aza indirmek; ikincisi ise bu
depolarda kullanılan raf miktarını en aza indirmektir. Problem NP-Zor olarak
sınıflandırıldığı için, matematiksel modele ek olarak, büyük ölçekli
problemleri çözmek için de bir sezgisel algoritma geliştirilmiştir. Bu sezgisel
çözüm algoritmasını temel alan, kullanıcı dostu arayüze sahip bir karar destek
sistemi (KDS) önerilmiştir. Önerilen KDS' nin yardımıyla, depoların daha
verimli kullanılması ve hammaddelerin sistematik olarak depolanması
sağlanmıştır. Bu şekilde, toplam nakliye maliyeti fabrikada yaklaşık % 61
oranında azaltılmıştır.

Keywords

Raf Atama, Depo Yerleşimi, Matematiksel Model, Karar Destek Sistemi

MATHEMATICAL AND HEURISTIC SOLUTION APPROACHES FOR SHELF ASSIGNMENT PROBLEM IN MULTIPLE WAREHOUSES

Abstract

One of the most important elements
of the supply chain is the warehouses. Effective warehouse layout reduces delivery
time to the customer and the cost of storage. In this study, warehouse layout problem
in a ceramic factory with multiple warehouses and heterogeneous raw materials
is discussed. For the solution of the problem, a multi-objective mixed integer
mathematical model is proposed. The first aim of the model is to assign the raw
materials to the shelves considering the raw material priority coefficients by
minimizing the transportation distance between two warehouses and four
factories and the second one is minimizing amount of shelf used in these warehouses.
As the problem is classified as NP-Hard, in addition to the mathematical model,
a heuristic algorithm has been
also developed to solve large-scale problems. Based on this heuristic, a
decision support system (DSS) with a user-friendly interface has been proposed
for the engineers in the factory. By the help of proposed DSS, more efficient
use of warehouses and systematic storage of items have been provided. In this manner, total transportation cost is decreased
approximately 61% in the factory.

Keywords

Shelf Assignment, Warehouse Layout, Mathematical Model, Decision Support System

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