A Production Inventory Model with Shortages, Fuzzy Preparation Time and Variable Production and Demand

Nirmal Kumar Mahapatra, Uttam Kumar Bera, Manoranjan Maiti

Department of Applied Mathematics, Vidyasagar University, Midnapore, India.
Department of Mathematics, Bengal Institute of Technology & Management, Santiniketan, India.
Department of Mathematics, Panskura Banamali College, Panskura, India.

DOI: 10.4236/ajor.2012.22021                

Abstract

A production inventory model is formulated for a single item. Here, demand varies with the on-hand inventory level and production price. Shortages are allowed and fully backlogged. The time gap between the decision and actual commencement of production is termed as “preparation time” and is assumed to be crisp/imprecise in nature. The set-up cost depends on preparation time. The fuzzy preparation time is reduced to a crisp interval preparation time using nearest interval approximation and following the interval arithmetic, the reduced problem is converted to a multi-objective optimization problem. Mathematical analysis has been made for single objective crisp model (Model-I). Numerical illustration have been made for both crisp (Model-I) and fuzzy (Model-II) models. Model-I is solved by generalized reduced gradient technique and multi-objective model (Model-II) by Global Criteria Method. Sensitivity analyses have been made for some parameters of Model-I.

Keywords

Fuzzy Preparation Time; Interval Number; Multi-Objective; Global Criteria Method

Conflicts of Interest

The authors declare no conflicts of interest.

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