In cognitive radio networks (CRN), resource should dynamically be assigned to the users with respect to sensed radio atmospheres. Many works has been done for dynamic allocation but it is not practically easy because the secondary network is very difficult to know the right knowledge of dynamic radio atmospheres in CRN. In this object we study the different methods of dynamic resource allocatio...

Recent exploration by the Cassini/Huygens mission has stimulated a great deal of interest in Saturn's moon, Titan. One of Titan's most captivating features is the thick organic haze layer surrounding the moon, believed to be formed from photochemistry high in the CH(4)/N(2) atmosphere. It has been suggested that a similar haze layer may have formed on the early Earth. Here we report laboratory ...

In recent years, by population expansion and consequently expansion in service industries, competition has grown in retailing industry more than ever. Retailers can overcome competition in retailing industry by creating attractive, enjoyable, and even more exciting store environment. The purpose of this study is to help marketers, managers and retailers to create an enjoyable and memorable expe...

Negative ion atmospheric loading has been reported to affect a range of psychological functions, from alertness to circadian rhythms, and has been suggested to benefit a variety of medical conditions, from allergies to migraine. In a double-blind study planned to assess the effect of negative ions on cognitive performance in human volunteers, 65 female graduate course students were randomized i...

  Background: Sleep disturbances have negative effects on medical conditions, mental health and cognitive performance. It was shown that about 60% of inpatients suffer from sleep problems. The aim of this study was to assess the correlation between sleep quality and other factors in the inpatients of Rasoul-e-Akram hospital.   Methods: In this cross-sectional study, all the hospitalized patient...