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Morpholine-Induced Thermodynamic and Kinetic Inhibitions on Gas Hydrate Formation
Park, Seongmin,Ro, Hyeyoon,Lee, Jong-Won,Kang, Hyery,Lee, Huen American Chemical Society 2013 Energy & fuels Vol.27 No.11
<P>The unexpected formation of gas hydrates during production and transportation processes in petroleum industries is known as a serious problem. To deal with this problem, the oil and gas industry has been searching for hydrate inhibitors that have great performance and cost effectiveness. Recently, ionic liquids (ILs) have been suggested as novel hydrate inhibitors that are able to act in both thermodynamic and kinetic ways (so-called dual-function inhibitors). In this paper, we suggest a non-ionic liquid compound, morpholine, as a dual-function inhibitor by measuring hydrate-phase equilibria and a series of microscopic analyses [powder X-ray diffraction, solid-state <SUP>13</SUP>C nuclear magnetic resonance (NMR), and Raman spectroscopy]. Moreover, the formation kinetics of gas hydrates in the presence of morpholine was found to be better than two comparators, 1-ethyl-3-methylimidazolium tetrafluoroborate and polyvinylpyrrolidone. Such inhibition effects of morpholine are thought to be mainly attributed to the nucleophilicity of the ring compound forming hydrogen bonds between surrounding water molecules.</P>
Park, Seongmin,Lim, Dongwook,Seo, Yongwon,Lee, Huen The Royal Society of Chemistry 2015 Chemical communications Vol.51 No.42
<P>The stability of hydrate frameworks is influenced by guest molecules capable of hydrogen bonding with surrounding water molecules. Four remarkable features from the ammonium fluoride incorporation into a crystalline hydrate matrix provide important information on the thermodynamic stability, formation kinetics, structural characteristics, and molecular behavior in clathrate hydrate systems.</P> <P>Graphic Abstract</P><P>Ammonium fluoride incorporation induced structural modification showed a thermodynamic and kinetic inhibition effect of CH<SUB>4</SUB> hydrate. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5cc01705j'> </P>
Seongmin Park(박성민),Wonju Jeon(전원주) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
We propose a phononic beam to realize flexural wave bandgaps in wide and low frequency regimes. A unit cell of the phononic beam consists of two uniform parts and a tapered part with acoustic black hole configuration sandwiched between uniform parts. We identify the effects of geometrical parameters of the ABH-based phononic beam on band structures and determine those geometrical parameters to ob-tain a bandgap from 3.6 Hz to 237.9 Hz with a lattice constant of 1/33 wavelength. For experimental realization, the displacement transmission of the phononic beam is measured by impact hammer test, and the result shows that low transmission of -35 dB to -10 dB could be achieved in the wide bandgap.
Effect of Molecular Nitrogen on Multiple Hydrogen Occupancy in Clathrate Hydrates
Park, Seongmin,Koh, Dong-Yeun,Kang, Hyery,Lee, Jae W.,Lee, Huen American Chemical Society 2014 The Journal of Physical Chemistry Part C Vol.118 No.35
<P>Multiple H<SUB>2</SUB> occupancy in confined cages has been explored for the purpose of enhancing storage capacity. Furthermore, balancing the formation pressure with high storage capacity is one of the most significant factors. Here, we demonstrate the use of binary (LGM + N<SUB>2</SUB>) hydrates to capture hydrogen clusters under relatively mild conditions, even observing double H<SUB>2</SUB> occupancy in small cages. The cage occupancy and structures of hydrates were identified by the Raman spectroscopic analysis and high-resolution powder diffraction. The reaction product of binary (LGM + N<SUB>2</SUB>) hydrates with H<SUB>2</SUB> molecules suggests the possibility of multiple H<SUB>2</SUB> occupancy in both small (5<SUP>12</SUP>) and large (5<SUP>12</SUP>6<SUP>4</SUP>) cages at relatively low pressures. Also, the lattice parameter decreases with an increase in H<SUB>2</SUB> occupancy. The unique and abnormal role of N<SUB>2</SUB> as a preoccupied coguest significantly affects the H<SUB>2</SUB> population in a crystalline hydrate matrix and further lowers the pressure for structure stabilization.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2014/jpccck.2014.118.issue-35/jp5061254/production/images/medium/jp-2014-061254_0008.gif'></P>
Development of a System Grading Color and Texture of Beef using Spectral Information
( Seongmin Park ),( Daesik Son ),( Myongkyoon Yang ),( Jinshi Cui ),( Youngkwon Yun ),( Sung Ho Yoon ),( Seong In Cho ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
The meat color and texture are important factors in determining beef grade. However, unlike marbling, which can be easily judged by the human eye, the color and texture grade of the meat are highly likely to be misjudged by the person who makes the judgment according to the environment of the place. Therefore it is important to make equipment that can easily determine the color and texture of meat. In this study, we tried to develop a system for easily determining the color and texture grade of beef using portable spectroscopic analyzer. First, the spectroscopic information of each beef carcass was collected at the place where the beef grade was actually judged by the portable spectrometer. The wavelength band is from 400 nm to 1000 nm. And machine learning was used to match the meat color and texture grade information to this spectral information. The number of iterations was set to 10,000. Machine learning has reached an accuracy level that allows the system to judge adequately the color and texture. Based on these results, we made a mobile application. By using this application, we have implemented a system that can easily rate meat color and texture grade at the judgment place.