Study the impact of changing the number of users on the performance of the protocols of voice over the Internet H.323 and SIP

In this paper, we assess the Voice Over Internet Protocol performance by comparing the performance of two protocols used in VOIP such as SIP and H.323. Moreover, we evaluate the quality indicators such as delay and packets loss. For this purpose OPNET simulator is used as suitable simulation technology.

Evaluation of genetic parameters and simple correlation for some morphological and quality traits in local maize population

This study was conducted at the farm of Faculty of Agricultural-Kharabo as an intensive planting during 2011 and 2012 growth seasons. Using RCB design with two replications to study some genetic indices and simple linear correlation between yield and quality traits of 79 families selected from Sh population, improved by Full-sib selection. Results revealed that traits, silking days, protein percentage and oil percentage were affected by additive gene action while plant height and starch percentage were affected by non-additive gene action. Results also revealed that grain yield showed positive significant correlation with starch percentage (r=0.94*) and negative significant correlation with plant height (r=-0.95*) and protein percentage (r=-0.52*) indicating that less selection cycles are needed to improve families with high yield and starch percentage contents with early silking days (intensive planting) and medium plant height (machining cropper).