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In this work, we find the optimal relay location for a secondary user in a cognitive radio network subject to outage constraints. With selection decode-and-forward relay protocol, we formulate this problem as a nonlinear optimization problem, and then derive an approximation formulation that gives a close-optimal relay location, which means that we can use the approximation instead to solve the relay...
This paper proposes a routing protocol for the applications of Wireless Sensor Network (WSN). It is a protocol based on the PEGASIS protocol but using an improved ant colony algorithm rather than the greedy algorithm to construct the chain. Compared with the original PEGASIS, this one, PEG-ant, can achieve a global optimization. It forms a chain that makes the path more even-distributed and the total...
WS-Security is an essential component of the Web services protocol stack. WS-Security provides end-to-end security properties (integrity, confidentiality, and authentication) through open XML standards. End-to-end message security assures the participation of non-secure transport intermediaries in message exchanges, which is a key advantage for Web-based systems and service-oriented architectures...
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