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Hyunjoon Park,James Raymo,Mathew Creighton 한국여성정책연구원(구 한국여성개발원) 2009 Gender Studies and Policy Review Vol.2 No.-
Little research in Korea has systematically examined trends in the risk of marital dissolution, especially trends in educational differentials in divorce. Using individual-level data from the Korean Longitudinal Survey of Women and Family (KLoWF), we investigate how the association between education and divorce has changed across three marriage cohorts of women who married in the 1970s, 1980s, and 1990s, after taking into account various individual controls. The result from the Cox proportional hazard models of the divorce risk shows that the association between educational attainment and divorce has become more negative for younger marriage cohorts. In other words, divorce is increasingly concentrated among women with lower educational attainment than among their counterpart with higher education. We discuss implications of the growing concentration of divorce among low-educated women for socioeconomic differentials in children’s education and well-being.
Single-Molecule Rotation for EGFR Conformational Dynamics in Live Cells
Park, Youngchan,Shin, Sangwon,Jin, Hyeonggyu,Park, Jiseong,Hong, Yeonki,Choi, Jaemin,Jung, Byunghyuck,Song, Hyunjoon,Seo, Daeha American Chemical Society 2018 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.140 No.45
<P>Monitoring the dynamics of proteins in live cells on appropriate spatiotemporal scales may provide key information regarding long-standing questions in molecular and cellular regulatory mechanisms. However, tools capable of imaging the conformational changes over time have been elusive. Here, we present a single-molecule stroboscopic imaging probes by developing gyroscopic plasmonic nanoparticles, allowing for replication of protein-protein interactions and the conformational dynamics based on rotational and lateral velocities. This study fundamentally monitors the rotational motion of a membrane protein, epidermal growth factor receptor (EGFR), to decipher undiscovered structural dynamics in live cells without any molecular perturbations. This method offers a strategy to visualize assemblies and conformational changes, and provides unique insights into the mechanism underlying the molecular dynamics for receptors.</P> [FIG OMISSION]</BR>
Park, Ji Chan,Lee, Hyun Ju,Bang, Jung Up,Park, Kang Hyun,Song, Hyunjoon The Royal Society of Chemistry 2009 Chemical communications Vol.2009 No.47
<p>Ni@SiO<SUB>2</SUB> core-shell nanoparticles were transformed to Ni particles on silica spheres <I>via</I> a branched nickel phyllosilicate phase by hydrothermal and hydrogen reduction reactions; the final morphology was successfully employed as an active nanocatalyst for the hydrogen transfer reaction of acetophenone.</p> <P>Graphic Abstract</P><P>Ni/SiO<SUB>2</SUB> nanoparticles were generated from Ni@SiO<SUB>2</SUB> core-shell nanoparticles <I>via</I> a nickel phyllosilicate phase. The resulting morphology behaved as an active catalyst for the hydrogen transfer reaction of acetophenone. <img src='http://pubs.rsc.org/ej/CC/2009/b916837k/b916837k-ga.gif'> </P>
Hyunjoon Park,여준현 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.4
We study the role of the non-parquet diagrams in a nonperturbative approach called the parquet graph resummation method for studying correlations in a two-dimensional vortex liquid. As an analytic approach, the parquet graph resummation method captures the growing crystalline order in the vortex liquid as the temperature decreases. For its systematic improvement, it is important to understand the effects of the non-parquet diagrams, which are neglected in a usual approximation. The contribution of the non-parquet diagrams can be summarized into the non-parquet vertex function that appears in the lowest Landau level formalism of the Ginzburg-Landau theory of a superconductor in a magnetic field. We find that, as the temperature decreases, the non-parquet vertex develops minima at positions of the reciprocal lattice vectors of a triangular lattice where peaks grow in the structure factor of a vortex liquid. By solving the parquet equations for various forms of the non-parquet vertex, we analyze the effects of the minima in the non-parquet vertex on the positions and the sizes of the peaks in the structure factor. We study the role of the non-parquet diagrams in a nonperturbative approach called the parquet graph resummation method for studying correlations in a two-dimensional vortex liquid. As an analytic approach, the parquet graph resummation method captures the growing crystalline order in the vortex liquid as the temperature decreases. For its systematic improvement, it is important to understand the effects of the non-parquet diagrams, which are neglected in a usual approximation. The contribution of the non-parquet diagrams can be summarized into the non-parquet vertex function that appears in the lowest Landau level formalism of the Ginzburg-Landau theory of a superconductor in a magnetic field. We find that, as the temperature decreases, the non-parquet vertex develops minima at positions of the reciprocal lattice vectors of a triangular lattice where peaks grow in the structure factor of a vortex liquid. By solving the parquet equations for various forms of the non-parquet vertex, we analyze the effects of the minima in the non-parquet vertex on the positions and the sizes of the peaks in the structure factor.
Park, Se Ho,Choi, Ji Yong,Lee, Young Hwan,Park, Joon T,Song, Hyunjoon Wiley-VCH 2015 Chemistry - An Asian Journal Vol.10 No.7
<P>Small Se nanoparticles with a diameter of ?20?nm were generated by the reduction of selenium chloride with NaBH4 at -10?C. The reaction with Ag at 60?C yielded stable Ag2 Se nanoparticles, which subsequently were transformed into M-Se nanoparticles (M=Cd, Zn, Pb) through cation exchange reactions with corresponding ions. The reaction with Pt formed Pt layers that were evenly coated on the surface of the Se nanoparticles, and the dissolution of the Se cores with hydrazine generated uniform Pt hollow nanoparticles. The reaction with Au generated tiny Au clusters on the Se surface, and eventually formed acorn-shaped Au-Se nanoparticles through heat treatment. These results indicate that small Se nanoparticles with diameters of ?20?nm can be used as a versatile platform for the synthesis of metal selenide and metal-selenium hybrid nanoparticles with complex structures.</P>
Evaluation of functional properties of lactobacilli isolated from Korean white kimchi
Park, Soyoung,Ji, Yosep,Park, Hyunjoon,Lee, Kyuyeon,Park, Haryung,Beck, Bo Ram,Shin, Heuynkil,Holzapfel, Wilhelm H. Elsevier 2016 Food control Vol.69 No.-
<P>Kimchi, probably Korea's most famous traditional fermented food, is well known for its beneficial properties. Among several hundred different types of kimchi in Korea, white (baek) kimchi is prepared without chilli and is widely appreciated also by non-Koreans because of its unique mild flavour. In an approach to identify the bacteriological basis for proposed health benefits, we isolated 11 Lactobacillus strains from six samples of white kimchi, and investigated their safety and functional features. These strains represented the species Lactobacillus brevis, Lactobacillus plantarum and Lactobacillus sakei that dominated the populations within a range of 3 x 10(6) to 4 x 10(8) CFU/mL. Following safety assessment based on antibiotic resistance and biogenic amine production, 7 different strains were selected for further studies including evaluation of their adaptation to cabbage juice and resistance to phenol. Growth in and adaptation to the cabbage juice was favourably influenced by addition of 2% salt. Final selection was based on in vitro passage of simulated stomach duodenum conditions (SSDP model). The strains L. plantarum HAC01 and L sakei HAC10 were administered to a diet-induced obese (DIO) mouse model receiving a high-fat (HF) diet to assess their functionality in-vivo. Animal groups receiving the viable strains showed significantly lower body weight and total weight gain during 8 weeks compared to the high-fat control group. This study provides preliminary information on the use of in-vitro and in-vivo features for safety and functionality evaluation of Lactobacillus strains from white kimchi. These 'first level' criteria for strain selection may serve as model, thereby facilitating potentially new probiotic developments. (C) 2016 Elsevier Ltd. All rights reserved.</P>
Park, Youngchan,Oh, Hyuncheol,Park, Jiseong,Choi, Woong,Ryu, Hyein,Seo, Daeha,Song, Hyunjoon American Chemical Society 2019 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.123 No.37
<P>The generation of complex nanostructures to obtain novel characteristics and improved performance has been achieved by coupling multiple nanoscale reactions. Because reactions at the nanometer scale directly govern the morphology of nanostructures, understanding the reaction mechanism is critical to precisely control the morphology and, eventually, the physicochemical properties of the materials. However, because of the ensemble-average effect, investigating the reaction mechanism at the bulk level does not provide sufficient information. In this study, we investigated the overall sulfidation reaction mechanism that occurred on individual silver nanocubes in real time at high temperature. Using the single-particle dark-field imaging technique, three discrete steps of the sulfidation reaction were clearly resolved in the profiles of the plasmon peak shift and the intensity change of individual particles according to time progress: (I) reactant diffusion to the silver surface by passing through a ligand barrier, (II) silver sulfide formation by C-S bond cleavage of cysteine molecules, and (III) diffusion of silver atoms in the silver sulfide layer until the complete formation of silver sulfide. By a combination of simulation and control experiments, physical constants were derived for each step, which is completely hidden in the ensemble measurements. Each individual nanoparticle exhibited a large variation of physical values, such as the reaction rate constant and diffusivity, mainly resulting from the intrinsic structural heterogeneity. Dark-field microscopy image processing based on surface plasmon scattering would be helpful to analyze the reaction kinetics and understand the reaction mechanisms of the numerous multistep nanoscale reactions in real time with high spatial and temporal resolutions under actual reaction conditions.</P> [FIG OMISSION]</BR>