A Two-Warehouse Model for Deteriorating Items with Holding Cost under Particle Swarm Optimization

A deterministic inventory model has been developed for deteriorating items and Particle Swarm Optimization (PSO) having a ramp type demands with the effects of inflation with two-warehouse facilities. The owned warehouse (OW) has a fixed capacity of W units; the rented warehouse (RW) has unlimited capacity. Here, we assumed that the inventory holding cost in RW is higher than those in OW. Shortages in inventory are allowed and partially backlogged and Particle Swarm Optimization (PSO) it is assumed that the inventory deteriorates over time at a variable deterioration rate. The effect of inflation has also been considered for various costs associated with the inventory system and Particle Swarm Optimization (PSO). Numerical example is also used to study the behaviour of the model. Cost minimization technique is used to get the expressions for total cost and other parameters

A two-storage model for deteriorating items with holding cost under inflation and Genetic Algorithms

A deterministic inventory model has been developed for deteriorating items and Genetic Algorithms (GA) having a ramp type demands with the effects of inflation with two-storage facilities. The owned warehouse (OW) has a fixed capacity of W units; the rented warehouse (RW) has unlimited capacity. Here, we assumed that the inventory holding cost in RW is higher than those in OW. Shortages in inventory are allowed and partially backlogged and Genetic Algorithms (GA) it is assumed that the inventory deteriorates over time at a variable deterioration rate. The effect of inflation has also been considered for various costs associated with the inventory system and Genetic Algorithms (GA). Numerical example is also used to study the behaviour of the model. Cost minimization technique is used to get the expressions for total cost and other parameters

A New Multi-objective Inventory Model under Stochastic Conditions with Considering Perishable Costs

This paper presents a new multiple objectives model for the optimal production for an inventory control system. The stocked items may be deteriorates and the systems costs will be change over the time. In the real situation, some but not all customers will wait for backlogged items during a shortage period and therefore, the model incorporates partial backlogging. The demand rate can be a function of inflation and time value of money where the inflation and time horizon i.e., period of business, both are random in nature. The objectives of the problem are: (1) Minimization of the total expected present value of costs over time horizon (consists of the deterioration cost, production cost, inventory holding cost, backordering cost, lost sale cost and ordering cost) and (2) Decreasing the total quantity of goods in the warehouse over time horizon. We propose the ideal point approach to formulate the model. The numerical example has been provided for evaluation and validation of the theoretical results

The New Mathematical Models for Inventory Management under Uncertain Market

Abstract: This paper presents the new mathematical model for determining the optimal ordering policy for industrial and commercial companies. In the previous research, the numerous inventory models under inflationary conditions have been developed. In these models, the demand rate, usually, has been considered constant and well known, time-varying, stock dependent or price-dependent. But, the demand rate, usually, is uncertain in the real world. Therefore, in this study, the new inflationary inventory models under stochastic demand conditions have been developed. The inventory system is in the state of multi-items with budget constraint. The numerical examples have also been given to illustrate and validate the theoretical results

TIME Value Of Money dalam Perspektif Hukum Islam

This article reveals the Islamic view of the concept of Time Value of Money (referred by economists as positive time preference). This concept states that the value of commodities at present is higher than in the future. Time Value of Money is closely linked to the ‘discount\u27 concept that exists in capital and investment theory and, in practice, is used as a tool for project evaluation as well as investment decisions. This study concludes that Islam is not familiar with the concept of Time value of money. Islam only recognizes the concept of economic value of time. In Islamic view, money is simply a means of exchange, not a commodity. Similarly, the motive for money demand is to meet the needs of transaction, not for speculation

Two warehouse inventory policy with price dependent demand and deterioration under partial backlogging

In today's era of higher competition in the business, there are many conditions such as offered concession in bulk purchasing, seasonality, higher ordering cost, etc., which force a retailer to purchase more quantities than needed or exceed the storage capacity. So in this situation the retailer has to purchase an extra warehouse named as rented warehouse to stock the extra quantity. In this paper an inventory model for deteriorating products with selling price dependent rate is developed. The occurring shortages are assumed to be partially backlogged and cycle time is also variable. The purpose of the development of this model is to compute the amount and time of order which can optimize the total average cost of the system. A solution procedure and numerical example are presented to illustrate the implementation of the proposed study. Sensitivity analysis concerning with distinct system parameters is also presented to demonstrate the model

Time Value of Money dalam Perspektif Hukum Islam

This article reveals the Islamic view of the concept of Time Value of Money (referred by economists as positive time preference). This concept states that the value of commodities at present is higher than in the future. Time Value of Money is closely linked to the ‘discount’ concept that exists in capital and investment theory and, in practice, is used as a tool for project evaluation as well as investment decisions. This study concludes that Islam is not familiar with the concept of Time value of money. Islam only recognizes the concept of economic value of time. In Islamic view, money is simply a means of exchange, not a commodity. Similarly, the motive for money demand is to meet the needs of transaction, not for speculation

A tri-level optimization model for inventory control with uncertain demand and lead time

We propose an inventory control model for an uncapacitated warehouse in a manufacturing facility under demand and lead time uncertainty. The objective is to make ordering decisions to minimize the total system cost. We introduce a two-stage tri-level optimization model with a rolling horizon to address the uncertain demand and lead time regardless of their underlying distributions. In addition, an exact algorithm is designed to solve the model. We compare this model in a case study with three decision-making strategies: optimistic, moderate, and pessimistic. Our computational results suggest that the performances of these models are either consistently inferior or highly sensitive to cost parameters (such as holding cost and shortage cost), whereas the new tri-level optimization model almost always results in the lowest total cost in all parameter settings