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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>
Jo, Y.,Kim, J.,Lee, C. Elsevier BV ; C/o Dept. of Chemical Engineering, N 2016 JOURNAL- TAIWAN INSTITUTE OF CHEMICAL ENGINEERS Vol.68 No.-
A downflow anaerobic filter packed with blast-furnace slag (BFS) grains was evaluated for treating cheese whey, a high-strength dairy effluent. The reactor demonstrated effective and stable biomethanation of whey in continuous mode without pH control. The chemical oxygen demand (COD) removal remained at around 80%, with the reactor pH being maintained neutral without buffering, in the organic loading rate (OLR) range of 0.8-2.4g COD/l@?d. Although the COD removal decreased down to below 60% at higher OLRs along with acid accumulation, the methane production rate continued to increase with increasing OLR. On the other hand, the methane yield was maintained at 0.28-0.34l/g COD throughout the experiment. The substrate removal and methane production kinetics were successfully described by the modified Stover-Kincannon model. The overall results suggest that BFS grains could be used as economic filter media for anaerobic treatment of cheese whey and other easily acidifying waste streams.
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.,Park, H.J.,Kwon, J.H. Elsevier 2016 Postharvest biology and technology Vol.112 No.-
<P>The detection of cellulose radicals by ESR spectroscopy in oranges irradiated by different radiation sources has been studied during storage. The peel of oranges was found to be more suitable for ESR analysis in comparison with flesh parts because of its higher fiber and lower moisture contents. The oranges were exposed to gamma ray, electron-beam, and X-ray sources, and the paramagnetic centres were investigated. The samples extracted with absolute ethanol followed by oven drying showed a reduced drying time (five-fold) and enhanced signal sensitivity (double) in comparison to freeze dried samples. Further, the ESR spectrum showed that a radiation-induced signal could be detected in samples exposed to a dose above 0.4 kGy regardless of the radiation source. Irradiated oranges were stored at different conditions such as dark at 4 degrees C, fluorescent light at 20 degrees C, and indirect natural light, to study ESR spectral behavior. Fading of signal intensity was predominant when the samples were stored under natural and artificial light. The identification of cellulose radicals using ESR technique was improved for irradiated oranges containing a total fiber content of more than 60% (dry basis) after ethanol extraction even after a prolonged storage. (C) 2015 Elsevier B.V. All rights reserved.</P>
Jo, Y.,Sanyal, B.,Ameer, K.,Kwon, J. H. Springer Science + Business Media 2017 European food research and technology Vol.243 No.8
<P>The development of reliable methods to distinguish between irradiated and non-irradiated food is essential to address the growing industrial interest in irradiation technology. DNA comet and thermoluminescence (TL) analyses were carried out to investigate radiation-induced markers in gamma-irradiated grapes (0-2 kGy). A DNA comet assay of the seeds and flesh of irradiated samples displayed tailed cells with a dose-dependent increase in tail length. In TL measurements, irradiated samples were characterized by a prominent TL peak at 180 degrees C with enhanced intensity. The TL ratio (TL1/TL2) enhanced the reliability of the results by confirming successful isolation of minerals. Irradiation was detectable for up to 6 weeks of storage, with overall acceptance qualities confirmed by a sensory evaluation. The results of the study suggest that both detection techniques could be used to identify irradiated grapes and that simultaneous use could provide a clear determination of irradiation status.</P>
Localization of dynamin-related protein 1 and its potential role in lamellipodia formation
Jo, Y.,Cho, H. M.,Sun, W.,Ryu, J. R. Springer Science + Business Media 2017 Histochemistry and cell biology Vol.148 No.1
<P>Dynamin-related protein1 (Drp1) plays an essential role in mitochondrial fission: Cytosolic Drp1 is translocated to the mitochondria upon stimulus, and oligomerized Drp1 constricts mitochondria by aid of actin filaments. Drp1 completes the fission process with GTP hydrolysis by its own GTPase activity. The importance of actin filament and its interaction with Drp1 in the mitochondrial fission process have been demonstrated. In this study, we found that Drp1 is enriched in the actin-rich leading edge of lamellipodia of mouse embryonic fibroblasts (MEFs) wherein mitochondria or peroxisomes are absent. Mff-binding mutant (A395D) of Drp1, which cannot be recruited to mitochondria, was also localized in lamellipodia, indicating that Drp1 in lamellipodia is not related to mitochondria. When lamellipodia formation was induced by platelet-derived growth factor (PDGF) in MEFs, S616 phosphorylated form of Drp1 was accumulated to the lamellipodia. Inhibition of Drp1 with Mdivi-1 or a specific shRNA significantly decreased PDGF-induced lamellipodia formation or initial cell spreading during re-plating of the cells, respectively. Interestingly, defective lamellipodia formation and cell adhesion caused by Drp1 inhibition were not rescued by supplementing L-carnitine, although it restored mitochondrial energy loss caused by Drp1 inhibition. Collectively, these results favor the idea that Drp1 might play a significant role in lamellipodia formation and cell spreading through a different mechanism from that used for regulating mitochondrial dynamics/function.</P>