BASİT U TİPİ MONTAJ HATTI DENGELEME PROBLEMİNE BULANIK PROGRAMLAMA YAKLAŞIMI

Bu makalede, basit U tipi montaj hattı dengeleme problemleri için bir bulanık tamsayılı programlama (U-FP) modeli geliştirilmiştir. Amaç çevrim zamanı, istasyon sayısı ve iş yükü gibi sağ taraf değişkenlerin belirsiz olduğu durumlarda karar vericiye çözüm sunabilmektir. Bu çalışma, U tipi montaj hattı literatüründeki ilk bulanık tamsayılı programlama çalışmasıdır. In this paper, a fuzzy integer programming model (U-FP) for the simple U shaped assembly line balancing problems is developed. The purpose of the model developed here is to provide a solution to the decision maker for uncertainty cases of cycle time, number of stations and work load values. This study is the first on fuzzy integer programming in the U shaped assembly line literature

An Experimental Research on Closed Loop Supply Chain Management with Internet of Things

Abstract. Closed loop supply chain (CLSC) optimization is integration of forward and reverse logistics activities. The importance of CLSC management is increasing by legal regulations, limited energy resources and environmental- financial problems that growing in recent years. However, reverse logistics part of the CLSC is a flow type which is more difficult to made predictions, planning and controls by reason contained uncertainties. This stage, Internet of Things system reduces related uncertainties by providing all the life information of the returned product and substantially attenuates planning of reverse flow activities. In this study, a CLSC is considered that meets demands of the sales&collection center both new and remanufactured product. Manufacturer has three options (refurbishing, disassembly and disposal) to assessing returned products. A mixed integer linear programming model is proposed for a single type of product is completely modular (automobile, computer, telephone, etc.). The model meets customer's products and components demands based period, maximizes profit consist of different sales revenues and total cost (total production, purchase, transportation and disposal costs) and determines how to evaluate all returned products. The proposed model has been verified with the aid of a numerical example by solving in GAMS software and its performance reviewed with experimental studies.Keywords. Closed loop supply chain optimization, Internet of Things, Mixedinteger linear programming, Returned product management.JEL. L80, L86, Q55

A Network Model for Parallel Line Balancing Problem

Gökçen et al. (2006) have proposed several procedures and a mathematical model on single-model (product) assembly line balancing (ALB) problem with parallel lines. In parallel ALB problem, the goal is to balance more than one assembly line together. In this paper, a network model for parallel ALB problem has been proposed and illustrated on a numerical example. This model is a new approach for parallel ALB and it provides a different point of view for interested researchers

A mixed integer programming model for remanufacturing in reverse logistics environment

Recently, there has been a growing interest in reverse logistics due to environmental deterioration. Firms incorporate reverse flow to their systems for such reasons as ecological and economic factors, government regulations and social responsibilities. In this paper a new mixed integer mathematical model for a remanufacturing system, which includes both forward and reverse flows, is proposed and illustrated on a numerical example. The proposed model provides the optimal values of production and transportation quantities of manufactured and remanufactured products while solving the location problem of dissassembly, collection and distribution facilities. The model is validated by using a set of experimental data reflecting practical business situation. Sensitivity analysis of the model is also presented

LOGISTICS NETWORK DESIGN FOR RECOVERABLE MANUFACTURING SYSTEMS: LITERATURE SURVEY

Nowadays, firms incorporate reverse flow to their systems because of some reasons such as economic and ecologic reasons, regulations from government, social responsibilities. These firms face to some problems such as designing efficient reverse logistics network and managing the reverse flow of materials, components or products. A generic reverse logistics network includes collecting the cores from customers, stocking, reprocessing and redistributing activities. In this paper, studies about logistics network design and modeling for product recovery are reviewed, classified and the main characteristics of them are tried to analyze