http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Min, K.,Oh, T. Institution of Electrical Engineers 2018 Electronics letters Vol.54 No.11
<P>An efficient dual-mode input and output transceiver scheme is proposed. The transceiver can achieve the data speed from 0.5 up to 4.4 Gbit/s with 0.6 V supply voltage and can support the near-ground mode for low-power memory interface application. The transceiver can transmit both PAM4/NRZ signals flexibly depending on the channel loss conditions. The prototype bi-directional two-channel transceiver is implemented in 45 nm CMOS process and occupies 0.0516 mm(2) chip area. The IP shows power consumption of 2.24/2.78 mW during 4.4 Gbit/s PAM4/NRZ mode operation, each, respectively.</P>
Electroenzymatic synthesis of l-DOPA
Min, K.,Park, D.H.,Yoo, Y.J. Elsevier Science Publishers 2010 Journal of biotechnology Vol.146 No.1
Parkinson's disease is caused by a deficiency of the neurotransmitter dopamine. Since l-DOPA (l-3,4-dihydroxyphenylalanine) is a precursor of dopamine and can pass across the blood-brain barrier, it has been used as a treatment for Parkinson's disease. Hundreds tons of l-DOPA are produced per year, and most of the current supply is produced by a chemical method of asymmetric synthesis. However, the chemical process for l-DOPA synthesis requires an expensive metal catalyst and shows low conversion rates and low enantioselectivity. In this study, we developed a novel technology for the production of l-DOPA, an electroenzymatic synthesis with a tyrosinase-immobilized cathode under the reduction potential of DOPAquinone, which is -530mV. Compared to other approaches for l-DOPA synthesis reported previously, this electroenzymatic system showed the highest conversion rate and a highly enhanced productivity of up to 95.9% and 47.27mgl<SUP>-1</SUP>h<SUP>-1</SUP>, respectively.
Min, K.,Farah, A.E.,Lee, S.R.,Lee, J.I. Pergamon Press 2017 Geochimica et cosmochimica acta Vol.196 No.-
Shock conditions of Martian meteorites provide crucial information about ejection dynamics and original features of the Martian rocks. To better constrain equilibrium shock temperatures (T<SUB>equi-shock</SUB>) of Martian meteorites, we investigated (U-Th)/He systematics of moderately-shocked (Zagami) and intensively shocked (ALHA77005) Martian meteorites. Multiple phosphate aggregates from Zagami and ALHA77005 yielded overall (U-Th)/He ages 92.2+/-4.4Ma (2σ) and 8.4+/-1.2Ma, respectively. These ages correspond to fractional losses of 0.49+/-0.03 (Zagami) and 0.97+/-0.01 (ALHA77005), assuming that the ejection-related shock event at ~3Ma is solely responsible for diffusive helium loss since crystallization. For He diffusion modeling, the diffusion domain radius is estimated based on detailed examination of fracture patterns in phosphates using a scanning electron microscope. For Zagami, the diffusion domain radius is estimated to be ~2-9μm, which is generally consistent with calculations from isothermal heating experiments (1-4μm). For ALHA77005, the diffusion domain radius of ~4-20μm is estimated. Using the newly constrained (U-Th)/He data, diffusion domain radii, and other previously estimated parameters, the conductive cooling models yield T<SUB>equi-shock</SUB> estimates of 360-410<SUP>o</SUP>C and 460-560<SUP>o</SUP>C for Zagami and ALHA77005, respectively. According to the sensitivity test, the estimated T<SUB>equi-shock</SUB> values are relatively robust to input parameters. The T<SUB>equi-shock</SUB> estimates for Zagami are more robust than those for ALHA77005, primarily because Zagami yielded intermediate f<SUB>He</SUB> value (0.49) compared to ALHA77005 (0.97). For less intensively shocked Zagami, the He diffusion-based T<SUB>equi-shock</SUB> estimates (this study) are significantly higher than expected from previously reported T<SUB>post-shock</SUB> values. For intensively shocked ALHA77005, the two independent approaches yielded generally consistent results. Using two other examples of previously studied Martian meteorites (ALHA84001 and Los Angeles), we compared T<SUB>equi-shock</SUB> and T<SUB>post-shock</SUB> estimates. For intensively shocked meteorites (ALHA77005, Los Angeles), the He diffusion-based approach yield slightly higher or consistent T<SUB>equi-shock</SUB> with estimations from T<SUB>post-shock</SUB>, and the discrepancy between the two methods increases as the intensity of shock increases. The reason for the discrepancy between the two methods, particularly for less-intensively shocked meteorites (Zagami, ALHA84001), remains to be resolved, but we prefer the He diffusion-based approach because its T<SUB>equi-shock</SUB> estimates are relatively robust to input parameters.
Min, K.,Jung, H.,Park, Y.,Cho, K. S.,Roh, Y. G.,Hwang, S.,Jeon, H. Royal Society of Chemistry 2017 Nanoscale Vol.9 No.25
<P>Phosphors, long-known color-converting photonic agents, are gaining increasing attention owing to the interest in white LEDs and related applications. Conventional material-based approaches to phosphors focus on obtaining the desired absorption/emission wavelengths and/or improving quantum efficiency. Here, we report a novel approach for enhancing the performance of phosphors: structural modification of phosphors. We incorporated inorganic colloidal quantum dots (CQDs) into a lateral one-dimensional (1D) photonic crystal (PhC) thin-film structure, with its photonic band-edge (PBE) modes matching the energy of `excitation photons' (rather than `emitted photons', as in most other PBE application devices). At resonance, we observed an approximately 4-fold enhancement of fluorescence over the reference bulk phosphor, which reflects an improved absorption of the excitation photons. This nano-structural engineering approach is a paradigm shift in the phosphor research area and may help to develop next-generation higher efficiency phosphors with novel characteristics.</P>