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Sang Hoon Lee,Inhye Jeong,Wen Yan Huang,Seong-Ju Oh,Laura Amaya Quiroz,Bok Kyung Han,Mi Jeong Kim,Young Jun Kim 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Sword bean (Canavalia gladiata (Jacq.) DC.) has long been used as food ingredient and herbal medicine in East Asia. However, there has been no study on the analysis of active compounds and physiological activity according to the extraction conditions of edible part. Sword bean was extracted with hot water and different concentration of ethanol for comparative analysis. A major indicatory active component was found to be rutin which was highest at 30% ethanol extract. Total polyphenol of sword bean was highest with 70% ethanol extract. Antioxidant activity (DPPH and ABTS) and total flavonoid contents of 30% ethanol extract was the highest among the extracts. In the MTT assay, both the hot water extract and the ethanol extract did not show apparent cytotoxicity up to 2mg/ml in RAW 264.7. NO production was inhibited dose-dependently in all extracts in RAW 264.7 cells. In conclusion, the optimal extraction conditions were established with the highest amount of the active compound, highest antioxidant activity and effectiveness in reduced NO production. This study would provide useful information on the utilization of sword bean as a functional food ingredient.
Huang, Guang-Hao,Kim, Jun-Whee,Chu, Woo-Sung,Oh, Min-Cheol,Seo, Jun-Kyu,Noh, Young-Ouk,Lee, Hyung-Jong Optical Society of America 2014 Optics express Vol.22 No.12
<P>Highly integrated optical components are strongly demanded because they enable wavelength-division multiplexing optical communication systems to achieve smaller footprints, lower power consumption, and enhanced reliability. Variable optical attenuator (VOA) arrays are often used with optical switches in cascaded form for reconfigurable optical add-drop multiplexer systems. Although VOAs and optical switches based on polymer waveguide technology are commercially available, it is still not viable to integrate these two array devices on a single chip because of significant interchannel crosstalk. In this work, we resolved the issue of crosstalk and integrated the arrays of optical switch and VOA on a single chip by incorporating a self-assembled scattering monolayer (SASM). The SASM was effective for scattering the planar guided mode; consequently, the crosstalk into an adjacent channel was significantly reduced, to less than -35 dB.</P>
Observation of magnetoconductivity with terahertz probes for ferromagnetic Fe films
Huang Lin,Zhao Yunxiu,Le Thi Nguyen,Lee Sang-Hyuk,Peng Zhi,Kim Seongheun,Shin Hee Jun,Park Jaehun,Kim Hyun-Joong,Hong Jung-Il,Bang Junhyeok,Lee Hyun Seok,Kim Kyung Wan,Kim Dong-Hyun 한국물리학회 2022 Current Applied Physics Vol.41 No.-
Ultrafast characterization of spin-dependent transport behavior in ferromagnetic systems without contact probes has been of strong demand, recently. We have experimentally investigated spin-dependent complex conductivity for ferromagnetic Fe films of various thickness by means of terahertz time-domain transmission spectroscopy. Comparison of the transmitted terahertz wave amplitude and the spin-dependent conductivity reveals that the magnetization state of films effectively determines the complex conductivity. Non-invasive observation of spin-dependent conductivity by contact-free terahertz probe method is proven to be promising in further investigating spintronic materials, particularly on an ultrafast timescale.
Ching-Sung Lee,Dong-Hai Huang,Jun-Chin Huang,Ke-Hua Su,Wei-Chou Hsu,Yeong-Jia Chen 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.4
A -doped In0.45Al0.55As/In0.53Ga0.47As/InAlGaAs/GaAs metamorphic high electron mobility transistor (MHEMT) using a Ni/Au-gate electrode has been successfully fabricated and demonstrated. Compared to conventional Au-gate devices with identical structures, the proposed device improves the kink-effect-related output conductance, the gate-voltage swing, the current drive capability, the breakdown characteristics, and the device power performance. Experimentally, a high extrinsic transconductance of 309 mS/mm, a high drain-source saturation current density of 573 mA/mm, an improved gate-voltage swing of 1.05 V with a corresponding saturation current density of 314 mA/mm, a high saturated output power of 11.3 dBm, and a high power gain of 23.8 dB with a power-added efficiency of 39.2 % are obtained for a 0.65 × 200 μm2 gate at 300 K. In addition, the measured fT and fmax are 49.1 and 61.7 GHz, respectively.
Investigations of δ -Doped In0.52Al0.48As/InxGa1-xAs/InP HEMTs with Different Channel Structures
Ching-Sung Lee,Hsin-Hung Chen,Jun-Chin Huang,Wei-Chou Hsu,Yeong-Jia Chen 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.6
The device characteristics of -doped In0.52Al0.48As/InGaAs/InP high-electron-mobility transistors (HEMTs) with different channel designs, grown by using the low-pressure metal-organic chemical-vapor deposition (LP-MOCVD) technique, have been studied. The InxGa1.xAs channel structures include a step-graded channel (SGC) with x = 0.56/0.53/0.5, a lattice-matched channel (LMC) with x = 0.53, and an inverse linearly-graded channel (ILGC) with x = 0.5 ! 0.56. Improvements in the device’s threshold, extrinsic conductance, saturation current density, gate-voltage swing (GVS), output conductance, voltage gain, and high-frequency and high-temperature performances have been comprehensively investigated and compared with respect to the specific channel design.
Zeng, Zebing,Sung, Young Mo,Bao, Nina,Tan, Davin,Lee, Richmond,Zafra, José,L.,Lee, Byung Sun,Ishida, Masatoshi,Ding, Jun,Ló,pez Navarrete, Juan T.,Li, Yuan,Zeng, Wangdong,Kim, Dongho,Huang American Chemical Society 2012 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.134 No.35
<P>Stable open-shell polycyclic aromatic hydrocarbons (PAHs) are of fundamental interest due to their unique electronic, optical, and magnetic properties and promising applications in materials sciences. Chichibabin’s hydrocarbon as a classical open-shell PAH has been investigated for a long time. However, most of the studies are complicated by their inherent high reactivity. In this work, two new stable benzannulated Chichibabin’s hydrocarbons <B>1-CS</B> and <B>2-OS</B> were prepared, and their electronic structure and geometry in the ground state were studied by various experiments (steady-state and transient absorption spectra, NMR, electron spin resonance (ESR), superconducting quantum interference device (SQUID), FT Raman, X-ray crystallographic etc.) and density function theory (DFT) calculations. <B>1-CS</B> and <B>2-OS</B> exhibited tunable ground states, with a closed-shell quinoidal structure for <B>1-CS</B> and an open-shell biradical form for <B>2-OS</B>. Their corresponding excited-state forms <B>1-OS</B> and <B>2-CS</B> were also chemically approached and showed different decay processes. The biradical <B>1-OS</B> displayed an unusually slow decay to the ground state (<B>1-CS</B>) due to a large energy barrier (95 ± 2.5 kJ/mol) arising from severe steric hindrance during the transition from an orthogonal biradical form to a butterfly-like quinoidal form. The quick transition from the quinoidal <B>2-CS</B> (excited state) to the orthogonal biradicaloid <B>2-OS</B> (ground state) happened during the attempted synthesis of <B>2-CS</B>. Compounds <B>1-CS</B> and <B>2-OS</B> can be oxidized into stable dications by FeCl<SUB>3</SUB> and/or concentrated H<SUB>2</SUB>SO<SUB>4</SUB>. The open-shell <B>2-OS</B> also exhibited a large two-photon absorption (TPA) cross section (760 GM at 1200 nm).</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2012/jacsat.2012.134.issue-35/ja3050579/production/images/medium/ja-2012-050579_0017.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja3050579'>ACS Electronic Supporting Info</A></P>
Chung, Moon-Soo,Huang, Ping,Ha, Chan-Man,Jun, Ji-Hyung,Ahn, Sung-Ju,Zhang, Fu-Chun,Bae, Hyun-Jong,Cho, Baik-Ho,Kim, Cheol-Soo 한국식물학회 2011 Journal of Plant Biology Vol.54 No.1
We carried out functional analysis of a putative novel Arabidopsis plasma membrane glucose-responsive regulator, designated AtPGR, which contains seven predicted transmembrane domains. Several evidences showed that AtPGR is a glucose-related protein, but its biological functions have yet to be reported in any plant. Analyses of the AtPGR promoter-${\beta}$-glucuronidase (GUS) construct and RNA in situ hybridization revealed substantial gene expression in the vasculature of various tissues, especially in the phloem region. Glucose treatment induced the highest levels of GUS activity, reaching a peak at 3 h and declining thereafter, consistent with glucose-mediated regulation of the AtPGR promoter. We generated an atpgr RNAi knockdown mutant and found that this plant grew and developed normally. Ectopic expression of AtPGR gene modulated the induction of glucose and 2-deoxyglucose insensitivity under stress conditions. By way of contrast, cotyledon greening of atpgr RNAi knockdown mutant seeds enhanced sensitivity to glucose and 2-deoxyglucose. Taken together, these results suggest that AtPGR functions as a potential glucoseresponsive regulator in carbohydrate metabolism.