An Approach to Obsolescence Forecasting based on Hidden Markov Model and Compound Poisson Process

Abstract

The popularity of electronic devices has sparked research to implement components that can achieve better performance and scalability. However, companies face significant challenges when they use systems with a long-life cycle, such as in avionics, which leads to obsolescence problems. Obsolescence can be driven by many factors, primary among which could be the rapid development of technologies that lead to a short life cycle of parts. Moreover, obsolescence problems can prove costly in terms of intermittent stock availability and unmet demand. Therefore, obsolescence forecasting appears to be one of the most efficient solutions. This paper presents a review of gaps in the actual approaches and proposes a method that can better forecast the product life cycle. The proposed approach will help companies to improve obsolescence forecasting and reduce its impact in the supply chain. The method introduces a stochastic approach to estimate the obsolescence life cycle through simulation of demand data using Markov chain and homogeneous compound Poisson process. This approach uses multiple states of the life cycle curve based on the change in demand rate and introduces hidden Markov theory to estimate the model parameters. Numerical results are provided to validate the proposed method. To examine the accuracy of this approach, the standard deviation (STD) of obsolescence time is calculated. The results showed that the life cycle curves of parts can be predicted with high accuracy.

Food composition databases in the era of Big Data: Vegetable oils as a case study

“…Obsolescence refers to the appearance of a new piece of information that supersedes an existing one that is still available ( 75 ). Some authors propose the use of machine-learning techniques to detect when data becomes obsolete or contradicts previous knowledge ( 76 ). In our context, as previously discussed, the composition of food is continuously changing as a consequence of both natural and human interventions.…”