wireless sensor networks (wsns) consist of a large number of sensor nodes which are capable of sensing different environmental phenomena and sending the collected data to the base station or sink. since sensor nodes are made of cheap components and are deployed in remote and uncontrolled environments, they are prone to failure; thus, maintaining a network with its proper functions even when und...

Abstract The multicast routing technology with multi-QoS constraint is the key for distributed multimedia on the network. In this routing scheme, ant colony algorithm is one of the best algorithms for solving this problem, but it takes too much time to converge. Therefore, an improved ant colony algorithm was proposed. The algorithm utilizes the pheromone positive feedback effect to guide chaos...

In this paper, a chaos-based spread spectrum watermarking algorithm is developed in the DCT domain for still image. The most important feature of chaos is its sensitivity to initial conditions. This characteristic makes chaos has been used successfully for secure watermarking and encryption. In our algorithm, we use logistic map to produce pseudo-random sequence. We use the logistic map twice: ...

in this study, a hybrid algorithm is presented to tackle multi-variables robust design problem. the proposed algorithm comprises neural networks (nns) and co-evolution genetic algorithm (cga) in which neural networks are as a function approximation tool used to estimate a map between process variables. furthermore, in order to make a robust optimization of response variables, co-evolution algor...

The open source Development Model Algorithm (ODMA) that was recently introduced has shown its good performance in optimization problems. In this algorithm each point in solution space of the given function has considered as open source software. The considered software (point in the solution space) evolves over time by open source development mechanism. In this paper we present a modified ODMA ...

Particle swarm optimization algorithm in solving complex functions, such as slow convergence, accuracy is not high, easily falling into local optimum problem. Based on the chaos optimization is introduced into particle swarm optimization algorithm, given the chaotic particle swarm optimization algorithm. In order to improve the image quality of CMOS image sensor, the image of the main noise sou...

abstract: in this paper, a method for determination of refractive index in membrane of fuel cell on basis of three-longitudinal-mode laser heterodyne interferometer is presented. the optical path difference between the target and reference paths is fixed and phase shift is then calculated in terms of refractive index shift. the measurement accuracy of this system is limited by nonlinearity erro...