Multiple secondary users can cooperate to increase the reliability of spectrum sensing in cognitive radio networks. However, the total transmission power grows approximately linearly with the number of cooperative secondary users. This paper proposes a new approach to optimize the trade-off between sensing reliability and power efficiency in cooperative cognitive radio networks over fading chan...

Assessing cognitive change in older adults is a common use of neuropsychological services, and neuropsychologists have utilized several strategies to determine if a change is "real," "reliable," and "meaningful." Although standardized regression-based (SRB) prediction formulas may be useful in determining change, SRBs have not been widely applied to older adults. The current study sought to dev...

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In this work we present a simulation study drawn upon a famous ethological example: food-sharing habit of vampire bats in Central America. A norm of reciprocity is introduced when agents are expected to exhibit a cooperative behavior under serious environmental strictures (infrequent but lethal food scarcity). We compare different agents’ architectures (with different levels of cognitive comple...

This paper presents findings from our empirical study of the creative process of improvisation, which has rarely been the subject of research in cognitive science. In this study, battle scenes in street dance were selected as an example of improvised performances. We conducted an experiment to investigate real-time cognitive processes. The results indicated three features: 1) Dancers mainly use...

nowadays we know effective supply chain management a key to business success. therefore, supply chain managers use many practices for scm effectiveness and many tools as their enablers. nevertheless, literature about causal relations between sc enablers and scm practices and performance is scarce. this study reports a cognitive mapping of causal relationships between scm practices, sc enablers ...

cognitive performance such as prediction and reaction time changes along with aging. it seems that regular lifetime physical activity depends on the delay of these factors. this study aimed at investigating the effect of pilates training on the improvement of motor performance of sedentary elderly men in kermanshah city. 40 sedentary elderly men (mean age 72.15 ± 6.54 years) were selected from ...

over the recent years, ever-increasing rate of improvement in knowledge and technology has changed the nature of roles in organizations and many jobs need high mental activity. thus, subjective well-being and performance of employees are two broad subjects that affect the performance of the organization. in this survey, we examined how different cognitive emotion regulation strategies influence...

although investigating the factors that influence test scores is important, a majority of stakeholders show a paucity of attention towards individual learner differences due to having large classes of l2 learners. this study sought to explore the possible effect of working memory and cognitive style on l2 learners’ metaphorical test performance. the study was conducted in 2 phases. the first ph...