(ABSTRACT) This thesis presents a performance evaluation system for cognitive radio. It considers performance as a complex, multi-dimensional function. Typically such a function would take some record of actions as an argument; however, a key contribution of this work is the addition of background information to the domain of the performance function. Including this information generalizes the ...

Optimal cognition during complex and sustained operations is a critical component for success in current and future military operations. “Cognitive Performance, Judgment, and Decision-making” (CPJD) is a newly organized U.S. Army Medical Research and Materiel Command research program focused on sustaining operational effectiveness of Future Force Warriors by developing paradigms through which m...

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...

Two experiments were carried out to examine how spreading food intake between either two or four occasions would affect mood and cognition. The first experiment used 96 participants in a between subject design where participants received either two milkshakes at 09:00 and 13:00 or four (half nutrient content but same volume) milkshakes at 09:00, 11:00, 13:00 and 15:00. The results showed that v...

A cognitive approach towards the understanding of human multitasking is presented in this contribution. Four dual-task studies provide evidence for the development and application of cognitive strategies which we refer to as “heuristics”: these fast and frugal rules of thumb help to adaptively use the information and structure of the environment to successfully perform two tasks concurrently. T...

In this paper the detection performance of relay based cognitive radio networks is studied. Relays are assigned in cognitive radio networks to transmit the primary user’s signal to cognitive coordinator or CPU thus achieving cooperative spectrum sensing. The soft fusion rule is used at the relays which acts as amplify and forward relays. For the detection purpose the energy detector is employed...

In this paper, the Erlang capacity achieved by the separate or joint use of several resource management mechanisms commonly considered in the literature (spectrum aggregation, spectrum adaptation, call buffering, channel reservation, selective interruption, and preemptive prioritization) to mitigate the effects of secondary call interruptions in cognitive radio networks (CRNs) is evaluated and ...

Cognitive radio (CR) technology has a great potential to maximize spectrum utilization. It exploits an underutilized licensed spectrum by enabling opportunistic communications for unlicensed users. In this work, we propose a distributed cognitive radio MAC protocol (COMAC) that enables unlicensed users to dynamically utilize the spectrum while limiting the interference imposed on primary (licen...