in this paper, we consider a cooperative cognitive radio network in which there is an ofdm primary link and multiple single carrier secondary links.the primary link is required to maintain its secrecy rate above a predefined threshold. if the secrecy rate requirement is not satisfied, the secondary system help primary link to maintain its secrecy rate requirement. in doing so, the secondary trans...

Multiagent resource allocation defines the issue of having to distribute a set of resources among a set of agents, aiming at a fair and efficient allocation. Resource allocation procedures can be evaluated with regard to properties such as budget balance and strategy-proofness. Designing a budget-balanced and strategy-proof allocation procedure that always provides a fair (namely, envyfree) and...

[Abstract]. As human beings increasingly participate in outer space through their efforts dedicated to exploration, habitation, recreation, and exploitation of resources – in terms of the frequency of missions, the distance travelled, and the number of human beings participating – the importance of coping with their health needs will increase proportionally. The space environment exposes the hu...

Shoreline mapping and shoreline change detection are critical for safe navigation, coastal resource management, coastal environmental protection, and sustainable coastal development and planning. This paper reports the results of IKONOS geopositioning accuracy improvement, showing that a 1-2 meter accuracy can be achieved from 1mresolution IKONOS Geo stereo images. The experiment indicated that...

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During the Nauru99 field experiment (held during June and July of 1999); the presence of an island effect on the cloud and radiation measurements recorded from the Atmospheric Radiation Cloud Station (ARCS) site at Nauru was identified. The island cloud effect occurs when moist air is advected over the island and the diurnal heating of the island (relative to the surrounding ocean) induces conv...

In recent years we have witnessed the massive introduction of new information technologies that are drastically changing the face of our society. These technologies are being implemented en masse in developed countries, but also in some pockets of developing nations as well. They rely on the convergence of several technologies such as powerful and affordable computers, real-time electronic meas...

organizations are networks of unites and individuals enhancing organizational performance through cooperation and synergy. it is achieved by developing meaningful and purposeful communications of unites and individuals .thus, it is essential to make organizational communications efficient in order to achieve organizational purposes. in this essay, we examined the variables and factors affecting...

High digital data throughput in Underwater Acoustic Communications (UAComm) is a challenging subject, specially in shallow water where the channel is a wave-guide causing multipath propagation and where Doppler effect usually occurs due to relative source-receiver motion jointly to ocean dynamics. The source and receiver sensors can be used for telemetry in point-to-point underwater communicati...