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Simulation of wind-induced near-inertial oscillations in a mixed layer near the east coast of Korea in the East/Japan Sea

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Acta Oceanologica Sinica 2013年第9期32卷 11-20页

作者： NAM sunghyun PARK Young-Gyu Naval Systems Development Center Agency for Defense Development Ocean Circulation and Climate Research Division Korea Institute of Ocean Science and Technology

Using a simple damped slab model, it was possible to show that a local wind induced 88% （15 of 17） of the near-inertial oscillations （NIO） observed in the mixed layer near the east coast of Korea from 1999 to 2004. The model, however, overestimated the energy level in about two-thirds of the simulated cases, because the slab model was forced with winds whose characteristic period was shorter than the damping time scale of the model at 1.5 d. At the observation site, due to typhoons and orographic effects, high-frequency wind forcing is quite common, as is the overestimation of the energy level in the slab model results. In short, a simple slab model with a damping time-scale of about 1.5 d would be enough to show that the local wind was the main energy source of the near-inertial energy in this area, but the model could not be used to accurately estimate the amount of the work done by the wind to the mixed layer.

关键词： near-inertial oscillations near-inertial waves slab model high-frequency wind forcing eastcoast of Korea

Spatio-temporal variability in sea surface wind stress near and off the east coast of Korea

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Acta Oceanologica Sinica 2005年第1期24卷 107-114页

作者： NAM sunghyun KIM Young Ho PARK Kyung-Ae KIM Kuh Ocean Laboratory/RIO School of Earth and Environmental Sciences Seoul National University Seoul 151-742 KoreaOcean Laboratory/RIO School of Earth and Environmental Sciences Seoul National University Seoul 151-742 KoreaOcean Laboratory/RIO School of Earth and Environmental Sciences Seoul National University Seoul 151-742 KoreaOcean Laboratory/RIO School of Earth and Environmental Sciences Seoul National University Seoul 151-742 Korea

Sea surface wind stress variabilities near and off the east coast of Korea, are examined using 7 kinds of wind datasets from measurements at 2 coastal (land) stations and 2 ocean buoys,satellite scatterometer (QuikSCAT), and global reanalyzed products (ECMWF,NOGAPS,and NCEP/NCAR). Temporal variabilities are analyzed at 3 frequency bands; synoptic (2-20 d), intra-seasonal (20-90 d),and seasonal (>90 d).Synoptic and intra-seasonal variations are predominant near and off the Donghae City due to the passage of the mesoscale weather system. Seasonal variation is caused by southeastward wind stress during Asian winter monsoon. The sea surface wind stress from reanalyzed *** and KMA-B measurements off the coast show good agreement in the magnitude and direction,which are strongly aligned with the alongshore *** the land-based sites,wind stresses are much weaker by factors of 3-10 due to the mountainous landmass on the east parts of Korea *** first EOF modes(67%-70%) of wind stresses from reanalyzed and QuikSCAT data have similar structures of the strong southeastward wind stress in winter along the coast but show different curl structures at scales less than 200 km due to the orographic *** second EOF modes (23%-25%) show southwestward wind stress in every September along the east coast of the North Korea

关键词： sea surface wind stress spatio-temporal variability monsoon seasonal intra-seasonal synoptic band orographic effect

Structural basis of DNA binding by the NAC transcription factor ORE1,a master regulator of plant senescence

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Plant Communications 2023年第3期4卷 139-150页

作者： Inseop Chun Hyo Jung Kim sunghyun Hong Yeon-Gil Kim Min-Sung Kim Department of Life Sciences Pohang University of Science and Technology(POSTECH)PohangGyeongbukRepublic of Korea Center for Plant Aging Research Institute for Basic ScienceDaeguRepublic of Korea Center for Genome Engineering Institute for Basic ScienceDaejeonRepublic of Korea Pohang Accelerator Laboratory Pohang University of Science and TechnologyPohangRepublic of Korea

Plants use sophisticated mechanisms of gene expression to control senescence in response to environmental stress or ***1(Arabidopsis thaliana NAC092)is a master regulator of senescence that belongs to the plant-specific NAC transcription factor protein ***1 has been reported to bind to multiple DNA targets to orchestrate leaf senescence,yet the mechanistic basis for recognition of the cognate gene sequence remains ***,we report the crystal structure of the ORE1-NAC domain alone and its DNA-binding *** structure of DNA-bound ORE1-NAC revealed the molecular basis for nucleobase recognition and phosphate backbone *** showthat local versatility in the DNA-binding site,in combination with domain flexibility of the ORE-NAC homodimer,is crucial for the maintenance of binding to intrinsically flexible *** results provide a platformfor understanding other plant-specific NAC protein-DNA interactions as well as insight into the structural basis of NAC regulators in plants of agronomic and scientific importance.

关键词： NAC transcription factor crystal structure DNA complex senescence regulator

Optimistic performance of carbon-free hydrazine fuel cells based on controlled electrode structure and water management

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Journal of Energy Chemistry 2020年第12期29卷 175-181页

作者： Hongsun Hwang Sujik Hong Do-Hyeong Kim Moon-Sung Kang Jin-Soo Park sunghyun Uhm Jaeyoung Lee Electrochemical Reaction and Technology Laboratory(ERTL) School of Earth Sciences and Environmental EngineeringGwangju Institute of Science and Technology(GIST)Cwangju 61005Republic of Korea Ertl Center for Electrochemistry and Catalysis Gwangju Institute of Science and Technology(GIST)Gwangju 61005Republic of Korea Department of Green Chemical Engineering Sangmyung UniversityCheonanChungnam 31066Republic of Korea Plant Engineering Center Institute for Advanced EngineeringYongin 17180Republic of Korea

In this study, we first attempted to discover the optimal configuration of membrane-electrode assemblies(MEAs) used to achieve a high performance of direct hydrazine fuel cells(DHFCs). We have investigated the effect of water management and the electrode thickness on the performance of DHFCs, depending on the hydrophobicity of the gas diffusion layers in the cathode and the catalyst loading in the anode with the carbon-supported Ni, synthesized by a polyol process. With the optimal water management and electrode thickness, the MEA constructed using the as-prepared Ni/C anode catalyst containing the metallic and low oxidative state and ultra-low Pt loading cathode reduced the ohmic resistance and mass transfer limitation in the current-voltage curves observed for the alkaline DHFC, achieving an impressive power performance over 500 mW cm^(–2).

关键词： Fuel cell Hydrazine Alkaline media Membrane-electrode assembly

Suppressive effects of acetone extract from the stem bark of three Acacia species on nitric oxide production in lipopolysaccharide-stimulated RAW 264.7 macrophage cells

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Asian Pacific Journal of Tropical Biomedicine 2016年第8期6卷 658-664页

作者： Kandhasamy Sowndhararajan Rameshkumar Santhanam sunghyun Hong Jin-Woo Jhoo Songmun Kim Department of Biological Environment Kangwon National University Laboratory of Natural Products Institute of Bioscience Universiti Putra Malaysia Department of Animal Products and Food Science Kangwon National University

Objective: To compare the inhibitory effects of acetone extracts from the stem bark of three Acacia species(Acacia dealbata, Acacia ferruginea and Acacia leucophloea) on nitric oxide ***: The lipopolysaccharide(LPS)-stimulated RAW 264.7 macrophage cells were used to investigate the regulatory effect of acetone extracts of three Acacia stem barks on nitric oxide production and the expression of inducible nitric oxide synthase,cyclooxygenase-2 and tumor necrosis factor-a. Further, the phenolic profile of acetone extracts from the Acacia barks was determined by liquid chromatography-mass spectrometry/mass spectrometry ***: All the three extracts significantly decreased LPS-induced NO production as well as the expression of inducible nitric oxide synthase, cyclooxygenase-2 and tumor necrosis factor-a in a concentration dependent manner(25, 50 and 75 mg/m L). In the liquid chromatography-mass spectrometry/mass spectrometry analysis, acetone extract of Acacia ferruginea bark revealed the presence of 12 different phenolic components including quercetin, catechin, ellagic acid and rosmanol. However, Acacia dealbata and Acacia leucophloea barks each contained 6 different phenolic ***: The acetone extracts of three Acacia species effectively inhibited the NO production in LPS-stimulated RAW 264.7 cells and the presence of different phenolic components in the bark extracts might be responsible for reducing the NO level in cells.

关键词： Acacia Anti-inflammatory Nitric oxide Macrophage RAW 264.7 cell

A novel chitosan nanocapsule for enhanced skin penetration of cyclosporin A and effective hair growth in vivo

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Nano Research 2019年第12期12卷 3024-3030页

作者： Jin Sil Lee Youngmin Hwang Hyeryeon Oh sunghyun Kim Jin-Hwa Kim Jeung-Hoon Lee Yong Chui Shin Giyoong Tae Won II Choi Center for Convergence Bioceramic Materials Convergence R&D DivisionKorea Institute of Ceramic Engineering and Technology202Osongsaengmyeong l-rof Osong-eupHeungdeok-guCheongjuChungbuk 28160Republic of Korea School of Materials Science and Engineering Gwangju Institute of Science and Technology123 Cheomdan-gwagiroBuk-guGwangju 61005Republic of Korea SKINMED Co. Ltd.Daejeon 34028Republic of Korea Amicogen Inc.64 Dongburo 1259JinsungJinju 52621Republic of Korea

Hair loss due to medical conditions,such as alopecia,male pattern baldness,and cancer chemotherapy treatment,has been a comm onproblem for many in *** n A(CsA),a fungal metabolite,has been reported to be a hair growth modulatory agent and is apotential drug for hair ***,the effect of topical application of CsA is limited by its poor water *** deliverysystems developed to enhance its solubility still showed poor skin *** overcome these limitations,in this study,we have developed a novel chitosan nanocapsule platform using Pluro nic F127 and chitosan without any chemical crosslinking or complicated preparati on steps for the enhanced water solubility and high tran sdermal penetration of *** chitosan nanocapsules(ChiNCs)optimized in terms of structural stability by using chitosan with various molecular weights ranging from 3 to 100 kDa enhanced the skin permeation of CsA through humancadaver skin in *** administration of the CsA loaded ChiNCs in creased the hair follicles by c.a.7 times higher than that of thecontrol group,and effectively induced hair growth in C57BL/6 mice in *** results suggest that ChiNCs could be used as a platform foreffective transdermal delivery of various hydrophobic drugs.

关键词： chitosan nanocapsule cyclosporin A transdermal delivery hair growth

Euonymus alatus prevents a high fat diet-induced hyperglycemia and hyperlipidemia

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Euonymus alatus prevents a high fat diet-induced hyperglycem...

How Do Phytochromes Transmit the Light Quality Information to the Circadian Clock in Arabidopsis？

第十五届国际药理学大会

作者： Park Sanghyun Hong Jongki Chung sunghyun College of Phar macy Kyunghee University Seoul 130-701Korea College of Phar macy Kyunghee University Seoul 130-701Korea College of Phar macy Kyunghee University Seoul 130-701Korea

＜正＞ This study investigated the preventive effect of Euonymus alatus （EA） ethanol extract on high fat diet - induced hyperglycemia and hyperlipidemia. ICR mice were randomly divided into five groups: control mice were to receive either a regular diet （RD） or high - fat diet （HFD）. and treatment groups were fed a high fat diet with either 350 mg/kg. 700 mg/kg of EA or 250 mg/kg of metformin for a 10 - week period. EA not only reduced body weight in a dose dependent manner, but also corrected associated hyperinsulinemia and hyperlipidemia. EA exerted beneficial effects on glucose and lipid homeostasis in diabetes that are not secondary to its ability to decrease food intake but its specific effects on hepatic lipo-genesis related genes （SREBPla. FAS. GAPT） and PPAR - gamma gene expression in periepididymal fat. Taken together, the combined effect of EA to reduce plasma glucose and lipid levels, and reduce the deposition of triglyceride in the liver are indicative of a marked improvement in high fat diet - induced hyperglycemia and hyperlipidemia.

关键词： Euonymus alatus high fat diet lipogenesis PPAR-gamma.This work was funded by Plant Diversity Research Center of 21st Century Frontier Re- search Program.

来源： cnki会议评论

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Molecular Plant 2014年第11期7卷 1701-1704页

作者： Miii Yeom Hyunmin Kim Junhyun Lim Ah- Young Shin sunghyun Hong Jeong-II Kim Hong Gil Nam Division of Molecular and Life Sciences PohangUniversity of Science and Technology Hyojadong Pohang Gyeongbuk 790-784 Republic of Korea Integrative Biosciences & Biotechnology in POSTECH Hyojadong Pohang Gyeongbuk 790-784 Republic of Korea Department of Molecular Biotechnology and Kumho Life Science Laboratory Chonnam National University Gwangju 500-757 Republic of Korea Center for Plant Aging Research Institute for Basic Science Daegu 711-873 Republic of Korea Department of New Biology DGIST Hyeongpoong-Myun Dalsung-gun Daegu 711-873 Republic of Korea

Dear Editor, Plants use light as an environmental signal to coor- dinate diverse physiological and developmental processes, thereby increasing their fitness. Light quality, quantity, and photoperiod change periodically under natural condi- tions of daily and seasonal cycles. Plants have developed a circadian clock to respond to these predictable, periodic environmental changes, providing plants with the ability to anticipate daily and seasonal environmental changes.

关键词：光照期拟南芥属植物

Co-Doped Rare-Earth (La, Pr) and Co-Al Substituted M-Type Strontium Hexaferrite: Structural, Magnetic, and Mossbauer Spectroscopy Study

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Materials Sciences and Applications 2020年第7期11卷 474-493页

作者： Madhav L. Ghimire Dom L. Kunwar Jiba N. Dahal Dipesh Neupane sunghyun Yoon Sanjay R. Mishra Department of Physics and Materials Science The University of Memphis Memphis TN USA Department of Physics Virginia Commonwealth University Richmond VA USA Department of Physics Kent State University Kent OH USA Department of Physics and Astronomy Truman State University Kirksville MO USA Department of Physics Gunsan National University Gunsan South Korea

The present study investigates the influence of La3+ and Pr3+ doping on the structural, magnetic properties, and hyperfine fields of Sr0.7RE0.3Fe12-2x CoxAlxO19, (RE: La3+ and Pr3+, x = 0.0 - 0.8) hexaferrite compounds prepared via auto-combustion technique. The XRD analysis shows a linear decrease in a and c lattice and unit cell volume contraction with the content x. The room temperature magnetic study shows that for the Pr3+ doped Sr0.7Pr0.3Fe12-2x CoxAlxO19 (Pr3+-SrM), the magnetization value monotonically decreases while for La3+ doped Sr0.7La0.3Fe12-2xCoxAlxO19 (La3+-SrM) magnetization value shows a noticeable increase in magnetization value with x. The coercivity of the Pr3+-SrM compound was observed to decrease while that of the La3+-SrM compound showed a marked 40% increase at x = 0.2 (~5829 Oe) in comparison to undoped SrFe12O19 (~3918 Oe). A difference in Curie temperature was also observed, with Tc ~ 525°C at x = 0.4 for Pr3+-SrM and Tc = 505°C for x = 0.4 for La3+-SrM compound. The observed differences in magnetic properties have been explained on the basis of the site occupancy of Co2+ and Al3+ in the presence of rare-earth ions. The presence of non-magnetic rare-earth ion, La3+, improved saturation magnetization, and coercivity and deemed suitable replacement for Sr2+. The hyperfine parameters namely quadrupole shift showed a decrease with the La3+ or Pr3+ doping independent of (Co2+-Al

关键词： Doped Hexaferrite M-Type Hexaferrite X-Ray Diffraction Mossbauer