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We study the horizontal shear (SH) wave problem propagating in a functionally graded piezoelectric material (FGPM) layered structure to compare the Wentzel-Kramers-Brillouin (WKB) method with the power series method. We establish coupled governing equations on the basis of elastodynamics theory. Both the WKB and power series methods are employed to solve the second-order variation coefficient equations...
Based on trend-following trading strategies that are widely used in the investment world, this work provides a set of sufficient conditions that determines the optimality of the traditional trend-following strategies when the trends are completely observable. A dynamic programming approach is used to verify the optimality under these conditions. The value functions are characterized by the associated...
This paper elaborated on the complex integration on the complex contour, and gave the calculation formula of complex integrals according to different cases with different number of singular points, namely, one singular point, n singular points, infinite singular points (countable). Therefore, it is easy to analysis and understand the development and establishment of complex integration on complex...
The aeroacoustic characteristics of propeller-wing were simulated numerically. And the efficiency affected by the installation of angle of the propeller blade was also analyzed. Based on the pressure cloud and streamlines, This experiment used FW-H equation proposed by Ffowcs Williams and Hawkings to imitate the sound generation and dissemination.
This paper investigates the impact of dynamic information on empty container repositioning in a seaport with uncertainties. Discrete-time dynamic programming is used to formulate the problem and minimize the expected costs consisting of inventory, leasing, and repositioning costs over an infinite horizon. The value iteration algorithm is applied to evaluate the optimal policies under the different...
We propose a novel approach to reconstruct complete 3D deformable models over time by a single depth camera, provided that most parts of the models are observed by the camera at least once. The core of this algorithm is based on the assumption that the deformation is continuous and predictable in a short temporal interval. While the camera can only capture part of a whole surface at any time instant,...
This paper proposes a new evolutionary algorithm with lower dimensional crossover and gradient-based mutation for real-valued optimization problems with constraints. The crossover operator of the new algorithm searches a lower dimensional neighbor of the parent points where the neighbor center is the barycenter of the parents, and therefore the new algorithm converges fast. The gradient-based mutation...
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