This paper is concerned with the optimal control of a production inventory system with time-varying deteriorating items. It is assumed that the deterioration rate follows the two parameters generalized exponential distribution. The continuous review policy is investigated. The optimality conditions are derived using Pontryagin maximum principle. The optimal total cost, the optimal inventory lev...

The retailer’s optimal procurement quantity and the number of transfers from the warehouse to the display area are determined when demand is decreasing due to recession and items in inventory are subject to deterioration at a constant rate. The objective is to maximize the retailer’s total profit per unit time. The algorithms are derived to find the optimal strategy by retailer. Numerical examp...

Compared with a group of age matched controls, patients with Parkinson's disease scored significantly lower in testing for ideomotor apraxia. Imitation of movement sequences was affected more severely than performance of single movements. The degree of impairment was not related to severity of motor disability, but correlated strongly with the results of tests that measured visuospatial and vis...

As organizations move from creating plans for individual production lines to entire supply chains it is increasingly important to recognize that planning decisions impact the quality of parts and products and, consequently, the production output. The consideration of product characteristics, e.g., fixed or uncertain lifetimes, is vital to production systems dealing with products that deteriorat...

This paper presents an economic manufacturing quantity model which determines an optimal production run length and inspection schedules simultaneously in a deteriorating production process. It is assumed that a production process is subject to a random deterioration from the in-control state to the out-of-control state and, thus, produces some proportion of defective items. An optimal productio...

The problem of deterioration of works of art is particularly relevant in Countries like Italy that are rich in Cultural Heritage. In fact, following UNESCO data, in Italy are located 2/3 of the Cultural Heritage known in the World. Archeological areas, statues, buildings, museums, churches and items there located, hypogean environments, are subjected to different stresses due the geographical p...

Since new drinking water regulations were implemented in England and Wales in 2000, cryptosporidiosis has been significantly reduced in the first half of the year but not in the second. We estimate an annual reduction in disease of 905 reported cases and approximately 6,700 total cases.