Results 181 to 190 of about 1,487 (218)
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Geometric Invariant Shape Representation Based on Radon and Adaptive Stationary Wavelet Transforms
Journal of Convergence Information Technology, 2010This paper proposes a novel and effective geometric invariant shape representation based on Radon and adaptive stationary wavelet transforms. The proposed representation is invariant to general geometrical transformations. Instead of analyzing shapes directly in the spatial domain, the proposed method extracts shape translation and scale invariant ...
Chi-Man Pun +2 more
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Microwave and Optical Technology Letters, 2021
AbstractA novel adaptive weighted geometric‐shaped (GS) 61 quadrature amplitude modulation (QAM) constellation is proposed in order to mitigate the nonlinear damage and increase the transmission distance. By introducing an adaptive weighting factor related to Kerr effect and fiber transmission distance in concentric regular hexagon constellation, the ...
Wenmao Zhou +8 more
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AbstractA novel adaptive weighted geometric‐shaped (GS) 61 quadrature amplitude modulation (QAM) constellation is proposed in order to mitigate the nonlinear damage and increase the transmission distance. By introducing an adaptive weighting factor related to Kerr effect and fiber transmission distance in concentric regular hexagon constellation, the ...
Wenmao Zhou +8 more
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Shape Optimization and Adaptivity of Axisymmetrical Shells Undergoing Geometric Nonlinearities
1999In this paper a general methodology to perform shape op- timization of geometrically non-linear shells of revolution including automatic mesh generation, error estimation technique and adaptivity, is proposed. The optimization process is carried out by coupling non-linear FE analysis, B-Spline shape parametrization, sensitivity analysis, mathematical ...
H. Naceur +3 more
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Shape changes through geometric nonlinear control as a strategy for structural adaptation
2020Adaptive structures modify their geometry and internal forces through sensing and mechanical actuation in order to maintain optimal performance under changing actions. Previous work has shown that well-conceived adaptive design strategies achieve substantial whole-life energy savings compared to traditional passive designs.
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IEEE Transactions on Magnetics, 2004
A new robust three-dimensional (3-D) shape optimization algorithm is suggested for electromagnetic devices, which combines design sensitivity analysis and adaptive geometric parameterization of the design surface. During the optimization process some extra control points are automatically inserted to describe the shape variations properly, and the ...
Y. Yao, J.S. Ryu, C.S. Koh, D. Xie
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A new robust three-dimensional (3-D) shape optimization algorithm is suggested for electromagnetic devices, which combines design sensitivity analysis and adaptive geometric parameterization of the design surface. During the optimization process some extra control points are automatically inserted to describe the shape variations properly, and the ...
Y. Yao, J.S. Ryu, C.S. Koh, D. Xie
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Adaptive Shape Retrieval based on Weighted Chaincode and Geometric Complexity Indices
The Journal of Korean Institute of Information Technology, 2022Jongan Park +4 more
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Measurement Science and Technology
Abstract In response to the escalating demand for precise shape metrology of complex optical surfaces, this study unveils a unified geometric error compensation and trajectory planning framework tailored for high-accuracy five-axis scanning metrology systems, which remains a notably underexplored field compared to error compensation in ...
Wen-Hao Zhang +3 more
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Abstract In response to the escalating demand for precise shape metrology of complex optical surfaces, this study unveils a unified geometric error compensation and trajectory planning framework tailored for high-accuracy five-axis scanning metrology systems, which remains a notably underexplored field compared to error compensation in ...
Wen-Hao Zhang +3 more
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Rate-adaptive geometric shaping for BICM with off-the-shelf component blocks
2023 IEEE Photonics Conference (IPC), 2023Metodi P. Yankov +2 more
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Modern construction and architecture
The article analyses the influence of product geometry on adaptation processes occurring during the formation of the structure of building composite materials at various stages of their manufacture and operation. It is shown that the geometric parameters of the product not only determine the spatial boundaries of the material, but also form its outer ...
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The article analyses the influence of product geometry on adaptation processes occurring during the formation of the structure of building composite materials at various stages of their manufacture and operation. It is shown that the geometric parameters of the product not only determine the spatial boundaries of the material, but also form its outer ...
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An adaptive encoding of geometric shapes suitable for aerodynamic design using genetic algorithms [PDF]
, 2002 Natural evolutionary systems exhibit a complex mapping between the genetic encoding carried by cells, to the body an form of a living species. The nature of this mapping facilitates the hereditary transfer of parental features to offspring through genes.
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