The double-cued task switching procedure has recently been introduced as a new way to measure externally cued switch costs. In the present individual differences study, two hundred fifty young adults completed measures of task switching, inhibition, and long-term memory. A latent variable approach was taken to examine the relationships among these cognitive measures. Decomposing the externally ...

Table 1. 2007 Estimated Return over Variable Costs for Cotton and Peanuts. Non-Irrigated Non-Irrigated Irrigated Irrigated Cotton Peanuts Cotton Peanuts Harvest Price 1/ $0.60 $0.21 $0.60 $0.21 Yield 750 300

the increase of healthcare costs improved as a rule the health of the population. sometimes the positive effects of this expense are shaded off. on one hand, this expense improves the offer of the medical care. other influential factors on the health of population, we quote as example the training, the lifestyle, the hygiene and the distribution of income. on the other hand the increase of thes...

Although carp is still widely sold and used in its fresh form, a range of value additions may also be observed. It is essential to know the development and management of a carp farm production costs and their evolution. In Iran, warm-water fish farming is based on common, silver, grass, and bighead carps. The carp is easy to rise in hatcheries in very large numbers at little cost, and is distri...

In the present paper we develop recursive algorithms to evaluate the distribution of the net present value (abbreviated as ”NPV”) of a health care contract. The duration of the program is a random variable representing the lifetime of an individual. We suggest a discrete time phase-type approach to model individual health care costs. In this approach, annual health care costs depend naturally o...

Many authors adhere to the rule that test reliabilities should be at least .70 or .80 in group research. This article introduces a new standard according to which reliabilities can be evaluated. This standard is based on the costs or time of the experiment and of administering the test. For example, if test administration costs are 7 % of the total experimental costs, the efficient value of the...

This paper develops a method for solving the single product multi-period production-planning problem, in which the production and the inventory costs of each period arc concave and backlogging is not permitted. It is also assumed that the unit variable cost of the production evolves according to a continuous time Markov process. We prove that this production-planning problem can be Stated as a ...

When planning for tasks that feature both state-dependent action costs and conditional effects using relaxation heuristics, the following problem appears: handling costs and effects separately leads to worse-than-necessary heuristic values, since we may get the more useful effect at the lower cost by choosing different values of a relaxed variable when determining relaxed costs and relaxed acti...