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Development of Aircraft Mission Performance Analysis Program
Lee, Hyunseok,Lee, Hyungjoon,Kwak, Einkeun,Lee, Seungsoo,Bae, Seungho The Korean Society for Aeronautical and Space Scie 2013 International Journal of Aeronautical and Space Sc Vol.14 No.2
A general purpose aircraft mission performance analysis program has been developed. The program can be used in design mode or in analysis mode. Fuel weight for a given mission profile can be estimated when the design mode is chosen, while mission time or mission range for a given fuel can be estimated when the analysis mode is chosen. The mission analysis program is written with JAVA and includes GUI(Graphic User Interface) for users' conveniences. With a proper combination of databases for propulsion, aerodynamics and weight, the program can be configured to compute the performance of any type of aircraft. The program is validated by comparing its results with the results of a well known performance analysis program by ADD(Agency for Defense Development).
Lee, Hyeong-Hoon,Ahn, Sook-Hyun,Nam, Byong-Uk,Kim, Byeong-Soo,Lee, Gang-Woo,Moon, Donghyun,Shin, HyungJoon,Han, Kyu Won,Yoon, Ji-Ho AmericanChemical Society 2012 Environmental science & technology Vol.46 No.7
<P>Landfill gas (LFG), which is primarily composed of CH<SUB>4</SUB>, CO<SUB>2</SUB>, and N<SUB>2</SUB>, is produced from theanaerobicdigestion of organic materials. To investigate the feasibility ofthe storage and transportation of LFG via the formation of hydrate,we observed the phase equilibrium behavior of CO<SUB>2</SUB>–CH<SUB>4</SUB>–N<SUB>2</SUB> mixture hydrates. When the specificmolar ratio of CO<SUB>2</SUB>/CH<SUB>4</SUB> was 40/55, the equilibriumdissociation pressures were gradually shifted to higher pressuresand lower temperatures as the mole fraction of N<SUB>2</SUB> increased.X-ray diffraction revealed that the CO<SUB>2</SUB>–CH<SUB>4</SUB>–N<SUB>2</SUB> mixture hydrate prepared from the CO<SUB>2</SUB>/CH<SUB>4</SUB>/N<SUB>2</SUB> (40/55/5) gas mixture formed a structureI clathrate hydrate. A combination of Raman and solid-state <SUP>13</SUP>C NMR measurements provided detailed information regarding the cageoccupancy of gas molecules trapped in the hydrate frameworks. Thegas storage capacity of LFG hydrates was estimated from the experimentalresults for the hydrate formations under two-phase equilibrium conditions.We also confirmed that trace amounts of nonmethane organic compoundsdo not affect the cage occupancy of gas molecules or the thermodynamicstability of LFG hydrates.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2012/esthag.2012.46.issue-7/es203389k/production/images/medium/es-2011-03389k_0005.gif'></P>
Lee, Hansol,Baek, Sun-Yong,Chun, Se Young,Lee, Jae-Hyeok,Cho, HyungJoon Elsevier 2018 NeuroImage Vol.172 No.-
<P><B>Abstract</B></P> <P>Neuromelanin (NM) is an endogenous iron chelating molecule of pigmented neurons in the human substantia nigra (SN). Along with the increase in iron deposition, the reduction in NM-containing dopaminergic neurons and the variation of iron load on NM are generally considered to be important factors participating to pathogenesis of Parkinson's disease (PD). The aim of this study was to non-invasively delineate the spatial distributions of paramagnetic magnetic susceptibility perturbers, such as NM-iron complex and ferric iron in SN. Multiple quantitative MR parameters of <I>T</I> <SUB> <I>1</I> </SUB>, <I>T</I> <SUB> <I>2</I> </SUB>, <I>T</I> <SUB> <I>2</I> </SUB> <SUP> <I>*</I> </SUP>, susceptibility weighted image (SWI), quantitative susceptibility map (QSM), and <I>T</I> <SUB> <I>1</I> </SUB> weighted image with magnetization transfer (MT) effects were acquired for six post-mortem SN samples without a history of neurological disease. Co-registered quantitative histological validations were performed to identify and correlate NM pigments, iron deposits, and myelin distributions with respect to associated MR parameters. The regions with NM pigments and iron deposits showed positive magnetic susceptibility (paramagnetic) values, while myelinated areas showed negative magnetic susceptibility (diamagnetic) values from the QSM. The region of reduced <I>T</I> <SUB> <I>2</I> </SUB> values in SN mostly coincided with high iron deposits, but not necessarily with the NM pigments. The correlations between <I>T</I> <SUB> <I>2</I> </SUB> <SUP> <I>*</I> </SUP>/<I>T</I> <SUB> <I>2</I> </SUB> (or <I>T</I> <SUB> <I>2</I> </SUB> <SUP> <I>*</I> </SUP>/<I>T</I> <SUB> <I>2</I> </SUB> <SUP>2</SUP>) values and NM pigments were higher than those between <I>T</I> <SUB> <I>2</I> </SUB> <SUP> <I>*</I> </SUP> values and NM pigments, due to the effective size differences between NM-iron complex and ferric iron. Consequently, separate segmentations of ferric iron from the <I>T</I> <SUB> <I>2</I> </SUB> map and NM-iron complex from the <I>T</I> <SUB> <I>2</I> </SUB> <SUP> <I>*</I> </SUP>/<I>T</I> <SUB> <I>2</I> </SUB> map (or <I>T</I> <SUB> <I>2</I> </SUB> <SUP> <I>*</I> </SUP>/<I>T</I> <SUB> <I>2</I> </SUB> <SUP>2</SUP> map) were possible with the boundary of the SN determined from the <I>T</I> <SUB> <I>1</I> </SUB> weighted image.</P>
Quantum efficiency of colloidal suspensions containing quantum dot/silica hybrid particles
Jeon, Hyungjoon,Yoon, Cheolsang,Lee, Sooho,Lee, Doh C,Shin, Kyusoon,Lee, Kangtaek IOP 2016 Nanotechnology Vol.27 No.43
<P>We have investigated the fluorescence properties of colloidal suspensions conntaining quantum dot (QD)/silica hybrid particles. First, we synthesized QD/silica hybrid particles with silica–QD–silica (SQS) core–shell–shell geometry, and monitored the quantum efficiencies of their suspensions at various particle concentrations. We found that the quantum efficiency (QE) of SQS particles in deionized (DI) water was much lower than that of the QDs even at low particle concentration, mainly due to the light scattering of emitted photons at the silica/water interface, followed by reabsorption by QDs. As the concentration of SQS particles was increased, both light scattering and reabsorption by QDs became more important, which further reduced the QE. Refractive index-matched solvent, however, reduced light scattering, yielding greater QE than DI water. Next, we induced aggregation of SQS particles, and found that QE increased as particles aggregated in DI water because of reduced light scattering and reabsorption, whereas it remained almost constant in the refractive index-matched solvent. Finally, we studied aggregation of highly concentrated silica particle suspensions containing a low concentration of SQS particles, and found that QE increased with aggregation because light scattering and reabsorption were reduced.</P>