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Miniaturised dual-band implantable antenna for wireless biotelemetry
Cho, Y.,Yoo, H. IET 2016 Electronics letters Vol.52 No.12
<P>A miniaturised implantable antenna with dual-band operation the Medical Implant Communications Service (MICS) (402-405 MHz) and Industrial, Scientific, and Medical (ISM) (2400.0-2483.5 MHz) bands is presented. The size of the proposed antenna is 31.5 mm(3) (8.75 mm x 7.2 mm x 0.5 mm) which is the smallest size compared to previous implantable antennas. A serpentine-shaped radiating patch and open-end slot placed on the ground plane are used for miniaturisation. The performance of the antenna was evaluated from measurements and is based on good agreement with simulations.</P>
H<sub>2</sub> effects on diesel combustion and emissions with an LPL-EGR system
Cho, Y.,Song, S.,Chun, K.M. Pergamon Press ; Elsevier Science Ltd 2013 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.38 No.23
In this study, we examined H<SUB>2</SUB> effects on the combustion and emissions of a diesel engine with low-pressure loop (LPL) exhaust gas recirculation (EGR). We converted a 2.2-L four-cylinder direct-injection diesel engine satisfying Euro5 for H<SUB>2</SUB> supply. An LPL-EGR system replaced the high-pressure loop (HPL) EGR system. For all tests, the brake mean effective pressure (BMEP) was kept at 4 bar and the EGR ratio was varied from 9 to 42%. The H<SUB>2</SUB> energy percentage was varied from 0 to 7.4% independently to evaluate the H<SUB>2</SUB> effects and EGR effects separately. The heat release rate was calculated from the measured cylinder pressure. We found that substitution of H<SUB>2</SUB> for diesel fuel made the premixed burn fraction larger, and reduced the nitrous oxide (NOx) and particulate matter (PM) emissions simultaneously. For example, the NOx emissions were reduced by 36% for an EGR of 42% and an H<SUB>2</SUB> percentage of 7.4%. PM emissions were reduced by 18% for an EGR of 35% and an H<SUB>2</SUB> percentage of 7.4% compared with diesel fuel only cases.
Cho, Y.,Lee, W.,Kim, H. Royal Society of Chemistry 2014 Journal of materials chemistry. A, Materials for e Vol.2 No.30
A novel synthetic process referred to as a protective coating method was developed for the fabrication of a carbon-supported Pt2Ni1 nanoparticle measuring approximately 5 nm in size with a Pt-rich shell via thermal treatment. A 3 to 5 nm thick potypyrrole layer encapsulating the surface of the Pt/C catalyst simultaneously acted as a sponge to absorb the Ni precursor and a physical barrier to inhibit the inevitable increase in particle size during the thermal treatment. The PPy layer does not behave as a poison to the catalyst because it is completely decomposed without carbonization on the Pt surface during the heat treatment in a H-2-Ar mixture. As a result, the resultant Pt2Ni1/C catalyst with a Pt-rich shell exhibited improved stability under acidic conditions and catalytic activity in an oxygen reduction reaction.
Cho, Y.,Lee, M.H.,Kim, H.,Ku, K.,Yoon, G.,Jung, S.K.,Lee, B.,Kim, J.,Kang, K. Pergamon Press 2017 Materials research bulletin Vol.96 No.4
Layered crystal structures are some of the most intensively studied intercalation hosts for guest ion insertion. For Mg insertion, layered transition metal sulfides or selenides have been used for reversible Mg intercalation; however, far less intercalation hosts have been found for layered oxides most likely because of the strong interaction between Mg<SUP>2+</SUP> and the oxide host. Here, we demonstrate that layered Li<SUB>x</SUB>Ni<SUB>0.5</SUB>Co<SUB>0.2</SUB>Mn<SUB>0.3</SUB>O<SUB>2</SUB> (NCM523), which is an important commercial electrode for Li-ion batteries but has been regarded as electrochemically inactive in rechargeable Mg batteries, can function as a reversible host for Mg<SUP>2+</SUP> if water opens up the layers and screens the electrostatic interaction between Mg<SUP>2+</SUP> and the host. Upon the formation of water-intercalated NCM523, the discharge capacity dramatically increases utilizing the multi-redox reaction of Ni<SUP>2+</SUP>/Ni<SUP>3+</SUP>/Ni<SUP>4+</SUP>, which exhibits an average voltage of ~3.1V (vs. Mg/Mg<SUP>2+</SUP>) in rechargeable Mg batteries with an energy density of 589Whkg<SUP>-1</SUP> in the first discharge.
Energy concentration of the focusing energy-critical fNLS
Cho, Y.,Hwang, G.,Shim, Y.S. Academic Press 2016 Journal of mathematical analysis and applications Vol.437 No.1
<P>We consider the fractional nonlinear Schrodinger equation (fNLS) with non-local dispersion vertical bar del vertical bar(alpha) and focusing energy-critical Hartree type nonlinearity [-(vertical bar x vertical bar(-2 alpha) * vertical bar u vertical bar(2))u]. We consider the energy -concentration phenomena of radial blowup solutions near the maximal existence time. We use the concentration -compactness approach of [19] for confined case and kinetic energy trapping approach of [21] for unconfined case. (C) 2015 Elsevier Inc. All rights reserved.</P>
Adaptive live streaming system performance of MMT and DASH over a deployed LTE network
Cho, Y.,Park, S.,Kim, K.,Suh, D.Y. IET 2016 Electronics letters Vol.52 No.13
<P>Moving Picture Expert Group (MPEG) media transport and dynamic adaptive streaming over Hypertext Transfer Protocol are compared, which have been standardised by the MPEG for internet-based video services. Their performances as adaptive live streaming systems are evaluated over a deployed long term evolution network. The results provide their operational limitations and optimal operation parameters to improve resource usage and the quality of the users' experience.</P>
Cho, Y.,Choi, M.H.,Kim, B.,Kim, S. Elsevier 2016 Journal of chromatography A Vol.1444 No.-
<P>An experimental setup for the speciation of compounds by hydrogen/deuterium exchange (HDX) with atmospheric pressure ionization while performing chromatographic separation is presented. The proposed experimental setup combines the high performance supercritical fluid chromatography (SFC) system that can be readily used as an inlet for mass spectrometry (MS) and atmospheric pressure photo ionization (APPI) or atmospheric pressure chemical ionization (APCI) HDX. This combination overcomes the limitation of an approach using conventional liquid chromatography (LC) by minimizing the amount of deuterium solvents used for separation. In the SFC separation, supercritical CO2 was used as a major component of the mobile phase, and methanol was used as a minor co-solvent. By using deuterated methanol (CH3OD), AP HDX was achieved during SFC separation. To prove the concept, thirty one nitrogen- and/or oxygen-containing standard compounds were analyzed by SFC-AP HDX MS. The compounds were successfully speciated from the obtained SFC-MS spectra. The exchange ions were observed with as low as 1% of CH3OD in the mobile phase, and separation could be performed within approximately 20 min using approximately 0.24 mL of CH3OD. The results showed that SFC separation and APPI/APCI HDX could be successfully performed using the suggested method. (C) 2016 Elsevier B.V. All rights reserved.</P>
Policy measures and necessities for small scale organic farming in the EU
Cho, Y.,Nicholas, P. Korean Association of Organic Agriculture 2011 韓國有機農業學會誌 Vol.19 No.S
Most of European countries have certain support measures of small holder organic producers in their policy system but they need to be more positive with this issue. Recent EU regulations and any other governmental organic farming measures are hardly emphasising on small holders' issues except a few measures. In order to secure small producer organic farming, the extensive efforts are needed. Developing new logos and differential support system for small producer organic at every aspects from production, marketing and public procurement level will become more positive actions to take, for example.