Statistical control implies stable random variation about a target value that is produced by some common cause. In many manufacturing systems, the majority of the processing time is spent in the steady-state phase. Hence, it makes sense that a system is in statistical control most of the time and the operator or decision-maker should avoid introducing unnecessary variation by making adjustments...

This paper discusses an Economic Production Quantity model for Weibull deteriorating items over an infinite time horizon under fuzzy environment. Fuzziness is introduced by allowing the cost components such as setup cost, production cost, holding cost, shortage cost and opportunity cost due to lost sales to certain extent. Triangular fuzzy numbers are used to represent the mentioned costs. Opti...

We have developed an order level inventory system for deteriorating items with demand rate as a ramp type function of time. The finite production rate is proportional to the demand rate and the deterioration rate is independent of time. The unit production cost is inversely proportional to the demand rate. The model with no shortages case is discussed considering that: (a) the demand rate is st...

In the literature of inventory after the development of classical economic order quantity (EOQ) model researchers extensively studied several aspects of inventory modeling by assuming constant demand rate. But in a real market demand of a product is always dynamic state due to the variability of time, price or even of the instantaneous level of inventory displayed in retail shop. This impressed...

Rational choice of teenage sexual behaviour lead to radically different predictions than do models that assume such behaviour is random. Existing empirical evidence has not been able to distinguish conclusively between these competing models. Using regional data from England between 1998 and 2001, I find that recent increases in availability of youth family planning clinics are associated with ...

The plant size distribution differs systematically across developed and developing countries. For example, in developing countries, less than one fifth of 1% of plants are large (employ 100 or more employees) and account for about one fifth of total employment. In sharp contrast, in developed countries, more than 1.6% of plants are large and account for more than two fifth of total employment. ...

In this present paper an inventory model is developed with ramp type demand, starting with shortage and three – parameter Weibull distribution deterioration. A brief analysis of the cost involved is carried out by an example.

U.S. schools are failing the nation and the nation’s economy. It may be that a greater level of expenditure can be justified and urged upon the nation based on an analysis of schooling effects on economic growth. Alternatively, the nation should aim to provide the highest quality of schooling at the level of expenditure preferred by the taxpayer. The application of a choice model for social exp...