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Adaptive Variable-Fidelity Analysis and Design Using Dynamic Fidelity Indicators
Jo, Y.,Yi, S.,Choi, S.,Lee, D.-J.,Choi, D.-Z. AMERICAN INST OF AERONAUTICS AND ASTRONAUTICS 2016 AIAA journal Vol.54 No.11
<P>The purpose of the current study is to develop a decision-making model of a dynamic fidelity indicator (DFI) for adaptive variable-fidelity (VF) analysis and to apply it to practical engineering problems, including computational design optimization. The biggest advantage is considerable computation efficiency while satisfying solution accuracy. Bayesian-based DFI and difference-based DFI are formulated as probabilistic model validation metrics to quantify model-form uncertainties attributed to the VF analysis. Two adaptive VF surrogate models of the VF kriging with regression and sample reinterpolation and the simple VF kriging with an additive bridge function are developed. The VF kriging models are integrated with the DFIs into an efficient global optimization design framework for the design problems, which was further improved by the multipoint and multi-objective infill sampling criteria. Validation of the developed framework is carried out with two analytic functions for solution optimality and computational efficiency. As a practical design application, the NLR 7301 multi-element airfoil with a flap is designed for high lift while the model-from uncertainty is defined by different flow solutions of the Euler and Reynolds-averaged Navier-Stokes equations. The results show that the design optimization becomes more efficient with great accuracy by the adaptive VF analysis with the DFIs.</P>
Jo, Y.,Sanyal, B.,Chung, N.,Lee, H.G.,Park, Y.,Park, H.J.,Kwon, J.H. Pergamon 2015 Radiation physics and chemistry Vol.111 No.-
Photostimulated luminescence (PSL) has been employed as a fast screening method for various irradiated foods. In this study the potential use of PSL was evaluated to identify oranges irradiated with gamma ray, electron beam and X-ray (0-2kGy) and stored under different conditions for 6 weeks. The effects of light conditions (natural light, artificial light, and dark) and storage temperatures (4 and 20<SUP>o</SUP>C) on PSL photon counts (PCs) during post-irradiation periods were studied. Non-irradiated samples always showed negative values of PCs, while irradiated oranges exhibited intermediate results after first PSL measurements. However, the irradiated samples had much higher PCs. The PCs of all the samples declined as the storage time increased. Calibrated second PSL measurements showed PSL ratio <10 for the irradiated samples after 3 weeks of irradiation confirming their irradiation status in all the storage conditions. Calibrated PSL and sample storage in dark at 4<SUP>o</SUP>C were found out to be most suitable approaches to identify irradiated oranges during storage.
Jo, Y.,Choi, H.,Yoon, J.Y.,Choi, S.K.,Cho, W.K. Elsevier BV 2016 Gene Vol. No.
Here, we identified eight Bell pepper endornavirus (BPEV) isolates from nine different pepper transcriptomes. BPEV was present with low copy numbers ranging from 0.01% to 0.18% in the host transcriptome. Phylogenetic identified two different groups of BPEV isolates. Sequence alignment of the five BPEV genomes revealed conservation of the 5' and 3' untranslated regions. Recombination analysis identified two possible recombinant events in the isolate Yolo Wonder. Single nucleotide variation profiles revealed the presence of BPEV variants within a single pepper cultivar. Taken together, this study provides phylogenetic and recombination analyses of the genus Endornavirus using pepper transcriptome data.
Jo, Y.,Kim, J.,Kim, S. Y.,Seo, Y. H.,Jang, K. S.,Lee, S.,Jung, S.,Ryu, B. H.,Kim, H. S.,Park, J. U. Royal Society of Chemistry 2017 Nanoscale Vol.9 No.16
<P>The use of 3-dimensional (3D) printable conductive materials has gained significant attention for various applications because of their ability to form unconventional geometrical architectures that cannot be realized with traditional 2-dimensional printing techniques. To resolve the major requisites in printed electrodes for practical applications (including high conductivity, 3D printability, excellent adhesion, and low-temperature processability), we have designed a chemically-reinforced multi-dimensional filler system comprising aminefunctionalized carbon nanotubes, carboxyl-terminated silver nanoparticles, and Ag flakes, with the incorporation of a thermoplastic polystyrene-polyisoprene-polystyrene (SIS) triblock copolymer. It is demonstrated that both high conductivity, 22 939 S cm(-1), and low-temperature processability, below 80 degrees C, are achievable with the introduction of chemically anchored carbon-to-metal hybrids and suggested that the highly viscous composite fluids employing the characteristic thermoplastic polymer are readily available for the fabrication of various unconventional electrode structures by a simple dispensing technique. The practical applicability of the 3D-printable highly conductive composite paste is confirmed with the successful fabrication of wireless power transmission modules on substrates with extremely uneven surface morphologies.</P>