932 research outputs found
Industry portfolio allocation with asymmetric correlations
We develop a new framework of optimal consumption and portfolio choice at industry portfolio level under dynamic and asymmetric correlations between industry and market portfolios. We derive in closed-form the optimal consumption and investment strategies under regime-dependent correlations environment. Overall, we find that ignoring time-varying and asymmetric correlations between portfolios can be costly to investors when applied to a construction of the optimal portfolio. Finally, we empirically test the performance of the model-based investment strategy
Integrating Deep Learning into CAD/CAE System: Generative Design and Evaluation of 3D Conceptual Wheel
Engineering design research integrating artificial intelligence (AI) into
computer-aided design (CAD) and computer-aided engineering (CAE) is actively
being conducted. This study proposes a deep learning-based CAD/CAE framework in
the conceptual design phase that automatically generates 3D CAD designs and
evaluates their engineering performance. The proposed framework comprises seven
stages: (1) 2D generative design, (2) dimensionality reduction, (3) design of
experiment in latent space, (4) CAD automation, (5) CAE automation, (6)
transfer learning, and (7) visualization and analysis. The proposed framework
is demonstrated through a road wheel design case study and indicates that AI
can be practically incorporated into an end-use product design project.
Engineers and industrial designers can jointly review a large number of
generated 3D CAD models by using this framework along with the engineering
performance results estimated by AI and find conceptual design candidates for
the subsequent detailed design stage
Acoustic metamaterial exhibiting four different sign combinations of density and modulus
We fabricated a double negative acoustic metamaterial which consisted of
Helmholtz resonators and membranes. Experimental data on the transmission and
dispersion relation are presented. The system exhibits three frequencies where
the acoustic state makes sharp transitions from density negative ({\rho} -NG)
to double negative (DNG), modulus negative (B-NG), and double positive (DPS) in
sequence with the frequency. We observed a wide range of negative refractive
index from -0.06 to -3.7 relative to air, which will allow for new acoustic
transformation techniques.Comment: 5 pages, 4 figures, submitted to Physical Review Letter
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