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(searched for: publisher_id:25032)
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Li Hecheng, Wang Yuping
Journal of Systems Engineering and Electronics, Volume 19, pp 1157-1164; https://doi.org/10.1016/s1004-4132(08)60213-3

Abstract:
Two classes of mixed-integer nonlinear bilevel programming problems are discussed.One is that the follower's functions are separable with respect to the follower's variables,and the other is that the follower's functions are convex if the follower's variables are not restricted to integers.A genetic algorithm based on an exponential distribution is proposed for the aforementioned problems.First,for each fixed leader's variable x,it is proved that the optimal solution y of the follower's mixed-integer programming can be obtained by solving associated relaxed problems,and according to the convexity of the functions involved,a simplified branch and bound approach is given to solve the follower's programming for the second class of problems.Furthermore,based on an exponential distribution with a parameterλ,a new crossover operator is designed in which the best individuals are used to generate better offspring of crossover.The simulation results illustrate that the proposed algorithm is efficient and robust.
Liu Shaobin, Zhou Tao, Liu Meilin, Hong Wei
Journal of Systems Engineering and Electronics, Volume 19, pp 15-20; https://doi.org/10.1016/s1004-4132(08)60039-0

Abstract:
We investigate computationally the attenuation and reflection of Terahertz (THz) wave using targets coated with plasmas. The simulators are the Wentzel-Kramer-Brillouin (WKB) method and finite-difference timedomain (FDTD) method. The relation between the frequency of the incident electromagnetic (EM) wave and the attenuation caused by unmagnitized plasma is analyzed. The results demonstrate that the amount of absorbed power is a decreasing function of the EM wave frequency and the plasma collision frequency. For THz band incident wave, the attenuation that is caused by plasma is small when the plasma has common density and the collision frequency. This conclusion has fine applying foreground for plasma anti stealth.
Zhong Lin, Tong Minq'An, Zhong Wei, Zhang Shcnquun
Journal of Systems Engineering and Electronics, Volume 18, pp 551-555; https://doi.org/10.1016/s1004-4132(07)60128-5

Abstract:
A multi-stage influence diagram is used to model the pilot's sequential decision making in one on one air combat.The model based on the multi-stage influence diagram graphically describes the elements of decision process,and contains a point-mass model for the dynamics of an aircraft and takes into account the decision maker's preferences under uncertain conditions.Considering an active opponent,the opponent's maneuvers can be modeled stochastically.The solution of multistage influence diagram can be obtained by converting the multistage influence diagram into a two-level optimization problem.The simulation results show the model is effective.
Zhang Baolin, Tang Gongyou, Zheng Shi
Journal of Systems Engineering and Electronics, Volume 17, pp 600-605; https://doi.org/10.1016/s1004-4132(06)60103-5

Abstract:
The PD-type iterative learning control design of a class of affine nonlinear time-delay systems with external disturbances is considered. Sufficient conditions guaranteeing the convergence of the n-norm of the tracking error are derived. It is shown that the system outputs can be guaranteed to converge to desired trajectories in the absence of external disturbances and output measurement noises. And in the presence of state disturbances and measurement noises, the tracking error will be bounded uniformly. A numerical simulation example is presented to validate the effectiveness of the proposed scheme.
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