This paper approaches Genetic algorithm for multi objective optimization of the multi item multi period procurement lot sizing problem. A mathematical model is developed to simulate raw material procurement lot sizing analysis for a real time valve manufacturing company. Model takes into account the constraints imposed by the budget, maximum order quantity and limited warehouse space. The analy...

This study aims to develop a multi-period distribution system design model that provides an integrated view of the various costs, service quality and budget concerns within the planning horizon, as well as computationally feasible methods for obtaining solutions in realistic situations. The key design decisions considered in each period are: the number and location of distribution centers in t...

This paper presents a multi-objective multi-mode resource-constrained project scheduling problem (MRCPSP) with positive and negative cash flows. We consider the objectives of the net present value (NPV) maximization and robustness maximization along by makespan minimization. Furthermore, to make a model close to the real world situations, two types of commonly used payment models are considered...

In this paper, we study scheduling of several projects in supply chain environment; activities of these projects are performed by some contractor companies. We present a new practical model for solving project scheduling problem in supply chain environment. A genetic algorithm and a simulated annealing algorithm are proposed for solving our model. The elements of genetic algorithm such as gener...

Reverse logistics (RLs) network design issues have been popularly discussed in recent years. However, few papers in past literature have been dedicated to the use of incentive effect on return quantity of used products. This study formulates an optimization model of RLs network design based on fuzzy mathematical programming with the aim of management in allocating used product by coordinating c...

⎯There have been many studies on two-stage supply models. Because supply chains are increasingly more complicated, this study considers the three-stage supply chain configurations which involve multiple companies at each stage and each company at the upstream stages can supply two or more customers. The coordination mechanisms for the members along the chain are achieved in the following two as...

In this paper, we propose an optimisation model to determine the product assortment, inventory replenishment, display area and shelf space allocation decisions that jointly maximize the retailer’s profit under shelf space and backroom storage constraints. The variety of products to be displayed in the retail store, their display locations within the store, their ordering quantities, and the all...

-An inventory model for deteriorating items and shortages with finite production rate and stochastic demand rate is developed when the supplier offers delay period to the retailer for due payment against purchases and the retailer in turn extends the trade credit offer to its customers. This policy of passing on of the credit period is well known as two-level of credit financing. Items in the s...

In this paper we present the on-going grammar engineering project in our group for developing in parallel resource precision grammars for Slavic languages. The project utilizes DELPH-IN software (LKB/[incr tsdb()]) as the grammar development platform, and has strong affinity to the LinGO Grammar Matrix project. It is innovative in that we focus on a closed set of related but extremely diverse l...

In this article we present a Spanish grammar implemented in the Linguistic Knowledge Builder system and grounded in the theoretical framework of Head-driven Phrase Structure Grammar. The grammar is being developed in an international multilingual context, the DELPH-IN Initiative, contributing to an open-source repository of software and linguistic resources for various Natural Language Processi...