the objective of this study was to determine the allowed and desired limits for heavy soils of texture (clay loom), as it has operational capability (friability), these limits were 6.34 mm for planting and 10.62 mm for harvesting in each raining or irrigation episode. we determined some factors that affect soil wetness and water content as follow: the amount and severity of rain, the condition ...

BACKGROUND Using Monte Carlo simulations, we compare different methods (maximizing Youden index, maximizing mutual information, and logistic regression) for their ability to determine optimum binary cut-off thresholds for a ratio-scaled diagnostic test variable. Special attention is given to the stability and precision of the results in dependence on the distributional characteristics as well a...

– In order to implement visible light communications (VLC) through indoor lighting, a set of challenges arise due to conflicting requirements from the two missions. In this paper we examine one of these challenges: how to communicate when the lights are " off. " We investigate VLC with limits on transmit power, which we define to be low enough so that users will accept that the lights are in th...

We develop a game-theoretic model of lobbying in which contributions buy access to politicians. The analysis considers the claim that the rich are better off because they have more access to politicians, and that contribution limits reduce the rich-interest advantage, resulting in less-skewed policy. We show that these arguments do not hold when the politician is strategic in granting access. I...

In this technical paper, we estimate instrumental limits of an unexacting comparison of results reported in different Web log studies. We consider sensitivity of results of log analysis to 4 controllable factors: a log sampling technique, an observation period and two cut-off variables peculiar to the Web log analysis (a LAN cut-off to exclude local area networks clients and a temporal cut-off ...

We establish functional central limit theorems (FCLTs) for a cumulative input process to a fluid queue from the superposition of independent on-off sources, where the on periods and off periods may have heavy-tailed probability distributions. Variants of these FCLTs hold for cumulative busy time and idle time processes associated with standard queueing models. The heavy-tailed on-period and off...