Recent trends in modeling of deteriorating inventory

4. Modelling Survival Data in Medical Research

This paper presents a complete and up-to-date survey of published inventory literature for the deteriorating (decaying) inventory models. More specifically, those papers are addressed that consider the effect of deterioration as a function of the on-hand level of inventory. The basic features, extensions and generalization of various models are discussed. A classification scheme is presented along with suggestions for future research.

https://link.springer.com/content/pdf/10.1057%2Fjors.1991.4.pdf

Survey of Literature on Continuously Deteriorating Inventory Models

Infertility and problems of impaired fecundity have been a concern through ages and is also a significant clinical problem today, which affects 8-12% of couples worldwide. Of all infertility cases, approximately 40-50% is due to "male factor" infertility and as many as 2% of all men will exhibit suboptimal sperm parameters. It may be one or a combination of low sperm concentration, poor sperm motility, or abnormal morphology. The rates of infertility in less industrialized nations are markedly higher and infectious diseases are responsible for a greater proportion of infertility. The present literature will help in knowing the trends of male factor infertility in developing nations like India and to find out in future, various factors that may be responsible for male infertility.

Trends of male factor infertility, an important cause of infertility: A review of literature.

Approximately 10 to 15% of couples are impacted by infertility. Recently, the pivotal role that lifestyle factors play in the development of infertility has generated a considerable amount of interest. Lifestyle factors are the modifiable habits and ways of life that can greatly influence overall health and well-being, including fertility. Many lifestyle factors such as the age at which to start a family, nutrition, weight, exercise, psychological stress, environmental and occupational exposures, and others can have substantial effects on fertility; lifestyle factors such as cigarette smoking, illicit drug use, and alcohol and caffeine consumption can negatively influence fertility while others such as preventative care may be beneficial. The present literature review encompasses multiple lifestyle factors and places infertility in context for the couple by focusing on both males and females; it aims to identify the roles that lifestyle factors play in determining reproductive status. The growing interest and amount of research in this field have made it evident that lifestyle factors have a significant impact on fertility.

/pdf/lifestyle-factors-and-reproductive-health-taking-control-of-ob45s39pgz.pdf

Lifestyle factors and reproductive health: taking control of your fertility

In this article, the problems of unbiased estimation of parameters in linear and quadratic mixture models have been revisited. We have studied some standard mixture designs for this purpose. The information matrices of the parameters involved in the linear and quadratic mixture models have been displayed for these standard designs. Some generalizations of the axial designs have been proposed and a comparative study of these designs, in respect of their information matrices, has been considered. Other types of mixture models viz. Becker’s homogeneous model and Draper - St. John’s model have also been briefly studied and the estimation problems have been addressed by using some axial type designs.

Parameter estimation in linear and quadratic mixture models: a review *

The paper studies a period review inventory model for deteriorating items allowing shortage and under price inflation. Demand during a reorder interval is assumed to be price dependent and the inventory manager has the option to pay his dues in two installments within a reorder interval. The optimum stock height to be maintained and the optimum length of a reorder interval are obtained by maximizing the total expected profit over the planning horizon. The sensitivity of the decision variables to change in model parameters has been also investigated through numerical

/pdf/a-periodic-review-inventory-model-for-deteriorating-items-3xdpxolcmz.pdf

A Periodic Review Inventory Model for Deteriorating Items with Price Dependent Demand and Partial Delay in Payment under Inflation

In this chapter, we focus on finding optimum mixture designs for the estimation of natural parameters of models other than that of Scheffe viz., Becker’s models, Darroch–Waller [D–W] model and Log-contrast model. It is also equally fascinating to note that so much has been done in these other mixture models as well. We mainly review the results that are already available and some new findings are presented.

Optimal Mixture Designs for Estimation of Natural Parameters in Other Mixture Models

Chapter 7 discusses the optimum designs for estimating the optimum mixture in Scheffe’s quadratic mixture model, using the trace optimality criterion. In this chapter, we address the problem of finding optimum mixture designs under deficiency and minimax criteria. In most cases, Kiefer’s equivalence theorem plays a key role in identifying the designs.

Manisha Pal

Papers

Parameter estimation in linear and quadratic mixture models: a review *

A Periodic Review Inventory Model for Deteriorating Items with Price Dependent Demand and Partial Delay in Payment under Inflation

Optimal Mixture Designs for Estimation of Natural Parameters in Other Mixture Models

More on Estimation of Optimum Mixture in Scheffé’s Quadratic Model

Maximin designs for the detection of synergistic effects