scholarly journals A stochastic inventory model of COVID-19 and robust, real-time identification of carriers at large and infection rate via asymptotic laws

2022 ◽  
Author(s):  
Christiana Tsiligianni ◽  
Aristeides Tsiligiannis ◽  
Christos Tsiliyannis
Keyword(s):  
Real Time ◽  
Infection Rate ◽  
Inventory Model ◽  
Stochastic Inventory ◽  
Stochastic Inventory Model ◽  
Real Time Identification

scholarly journals A stochastic inventory model with perishable and aging items

1999 ◽  
Vol 12 (1) ◽  
pp. 23-29 ◽  
Author(s):  
Lakhdar Aggoun ◽  
Lakdere Benkherouf ◽  
Lotfi Tadj
Keyword(s):  
Inventory Model ◽  
Inventory Level ◽  
Change Of Measure ◽  
Single Product ◽  
Perishable Items ◽  
Stochastic Inventory ◽  
Maximum Lifetime ◽  
Stochastic Inventory Model ◽  
History Of ◽  
Special Case

In this paper, we propose a single-product, discrete time inventory model for perishable items. Inventory levels are reviewed periodically and units in stock have a maximum lifetime of M periods. It is assumed that the dynamics of the inventory level is driven by a parameter process (reflecting perishability) and demands. By observing the history of the inventory level we obtain the conditional distribution of the perishability parameter by using the change of measure techniques. A special case is also presented.

scholarly journals Stochastic Inventory System With Different Rates of Production

2020 ◽  
Vol 11 (2) ◽  
pp. 36-52
Author(s):  
Mohammad Ataullah ◽  
Mohammad Ekramol Islam ◽  
Md. Sharif Uddin
Keyword(s):  
Production Rate ◽  
Poisson Distribution ◽  
Generation Time ◽  
Switching Time ◽  
Inventory Model ◽  
Inventory System ◽  
Exponential Parameter ◽  
Exchange Time ◽  
Stochastic Inventory ◽  
Stochastic Inventory Model

This article analyzes a solitary item stochastic inventory model with two distinctive generation rates where a request pursues Poisson distribution and an item has a limited lifetime which is level dependent. It is expected that the framework be on a foreordained level and the framework is changed over to ON mode from OFF mode with a noteworthy exchanging time with exponential parameter α. During the switching time, no interest will be served, the interest during the exchange time is lost. Here, excesses are permitted and during accumulations, the production rate is higher than that of ordinary generation time. Some framework attributes are shown with time variety.

A Simulation-Based Optimization Approach to a Lost Sale Stochastic Inventory Model

2012 ◽  
Vol 3 (2) ◽  
pp. 46-63 ◽  
Author(s):  
Rafael Diaz ◽  
Barry Charles Ezell
Keyword(s):  
Simulated Annealing ◽  
Inventory Model ◽  
Pattern Search ◽  
Ranking And Selection ◽  
Optimization Approach ◽  
Stochastic Inventory ◽  
Stochastic Inventory Model ◽  
Simulation Based ◽  
Simulation Based Optimization ◽  
Correlated Components

This paper describes a stochastic inventory model where the control review system is periodic; demand contains auto-correlated components; and categorized as a lost sale case. The authors propose a simulation-based optimization based on using a combination of simulated annealing, pattern search, and ranking and selection methods to search and approximate solutions to this problem. Simulated annealing is employed to stochastically nominate and pre-select solutions in a decision space. Pattern search is used to systematically define a grid of competitive neighbors around pre-selected solutions. Ranking and selection is used to evaluate the performance of such competing pre-selected alternatives. On one hand, results show that service level in terms of filling rates deteriorate as the autocorrelation grows and is ignored. In contrast, service levels were kept almost invariable to the effects of the serially correlated components for solutions suggested using the proposed algorithm.

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