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Analysis of network traffic behavior and modeling to predict, for network management and security early warning has a very important significance. An improved FOA-ESN method using opposition-based learning (OBL) mechanism for the network traffic prediction with multiple steps is proposed in this paper. Firstly, reconstructing the phase space of the original network flow time series, and then building...
This paper investigates the problem of relative control for spacecraft formation flying on an arbitrary elliptical orbit. The nonlinear dynamic model describing the relative motion between the leader spacecraft and the follower spacecraft is established in the presence of system model uncertainty and external disturbance. A continuous finite-time control scheme is designed by using a new form of terminal...
In this paper, the problem of relative position and attitude coupled control for rigid spacecraft in rendezvous and docking is investigated. We propose a control scheme with finite-time convergence based on the given coupled dynamics of relative position and attitude, in the presence of unknown but bounded external disturbance. Furthermore, we adopt a boundary layer function into the controller to...
This paper presents an automatic impedance-matching algorithm that can sequentially realize a simultaneous conjugate-matching state for all the elements in an N-element array antenna. The analytical results show that the converged solution obtained from the proposed algorithm agrees well with the solution calculated by the analytical deterministic equation, confirming the validity of the proposed...
Here, two matrix iterative methods are proposed to solve general coupled matrix equations, based on Paige's algorithms as the framework. By these new iterative methods, we can get the minimum Frobenius norm constrained solutions, such as symmetric, generalized bisymmetric and (R, S)-symmetric solutions.
A convergent algorithm is proposed for solving a class of optimization problems (P1), which can be broadly applied to engineering designs and stability analysis of nonlinear systems. By utilizing logarithmic characteristic and linearization technique, linear relaxation programming (LRP) about problem (P1) is established, through the successive refinement of the linear relaxation of the feasible region...
The gradient vector flow (GVF) is an effective external force for active contours, but it's smoothness constraint doesn't take any image structure into account and the resulting diffusion equation is isotropic which would oversmooth weak edges. In this article, a novel external force named image structure adaptive gradient vector flow (ISAGVF) is proposed for active contours. The proposed ISAGVF employs...
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