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Cognitive Radio is considered as a potential solution to improve spectrum utilization via opportunistic spectrum sharing. In this paper, we present a software testbed which is developed to implement the cognitive radio system. The basic functions of cognitive radio are explored and implemented, including spectrum sensing and dynamic spectrum management. The(More)
Regardless of the technical significance held by USN, the un-manned surveillance using wireless network cameras, the sensing technologies using the trespassing surveillance sensors as well as the technologies of encoding the data occurring within such systems, the technologies of transferring and processing them through the sensor network and the efficient(More)
According to growth of the IT industry, the e-commerce is revitalized and the necessity of e-cash is being stressed. As several e-cash systems are developed and applied due to it, the systems are contributing to development of e-commerce. The present thesis is a research for providing the convenience, divisibility and transfer of e-cash and, etc, of(More)
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