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Hao Cui,Xiaoxing Zhang,Hanyan Xiao,Ju Tang 한국탄소학회 2018 Carbon Letters Vol.25 No.-
Carbon chain inserted carbon nanotubes (CNTs) have been experimentally proven having undergone pronounced property change in terms of electrical conductivity compared with pure CNTs. This paper simulates the geometry of carbon chain inserted CNTs and analyzes the mechanism for conductivity change after insertion of carbon chain. The geometric simulation of Pt doped CNT was also implemented for comparison with the inserted one. The results indicate that both modification by Pt atom on the surface of CNT and addition of carbon chain in the channel of the tube are effective methods for transforming the electrical properties of the CNT, leading to the redistribution of electron and thereby causing the conductivity change in obtained configurations. All the calculations were obtained based on density functional theory method.
Cui, Jing-Hao,Cao, Qing-Ri,Lee, Beom-Jin Informa Healthcare 2007 DRUG DELIVERY Vol.14 No.5
<P> Enhanced delivery of bifidobacteria and fecal changes were compared following multiple oral administrations of protected bifidobacteria-loaded alginate poly-l-lysine microparticles (bap-microparticles) and unprotected bifidobacteria cultures over a period of 1 month to healthy human volunteers as preliminary in vivo studies. When bap-microparticles were orally administered, enhanced delivery of bifidobacteria was achieved. The viability of the bifidobacteria was significantly increased ∼ 11.5-30 times (1.06-1.48 log cycles) during the ingestion period when compared with the bifidobacteria culture group (p < 0.05). However, other gut microflora such as bifidobacteria, enterobacteriaceae, lactic acid bacteria, and staphylococci in feces were not significantly different between the two groups. Encapsulated bifidobacteria resulted in more frequent defecation and decreased fecal viscosity.</P>
Design of LED Luminaire for Parking Garage
Hao Cui,Si-Hyun Park 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.6
This study aims to design a zonal lumen for parking garage LED lightings of a slim appearance and 20 W/2,000 lm capacity and to fabricate a lighting luminaire accordingly. The frame is of a one-dimensional bar type with a reverse V-shaped section, with LED chips arranged along both sides. To maximize the 60° to 80° zonal lumen, the geometric structure was designed with the apex of the reverse V-shaped section at 40° and both sides at 70°. As for the LED light source, focusing lenses with narrower full-width half-maximum (FWHM) in luminous intensity were used. A ray-tracing simulation method was utilized for the zonal lumen simulation of the given structure. An actual hardware of luminaire based on the simulation results was fabricated and characterized. The suggested model is meant to develop LED lightings with a proper level of zonal lumen required in parking garages.
Hao Cui,Xiaoxing Zhang,Qiang Yao,Yulong Miao,Ju Tang 한국탄소학회 2018 Carbon Letters Vol.28 No.-
Transition-metal-embedded carbon nanotubes (CNTs) have been accepted as a novel type of sensing material due to the combined advantage of the transition metal, which possesses good catalytic behavior for gas interaction, and CNTs, with large effective surface areas that present good adsorption ability towards gas molecules. In this work, we simulate the adsorption of O2 and O3 onto Rh-doped CNT in an effort to understand the adsorbing behavior of such a surface. Results indicate that the proposed material presents good adsorbing ability and capacities for these two gases, especially O3 molecules, as a result of the relatively large conductivity changes. The frontier molecular orbital theory reveals that the conductivity of Rh-CNT would undergo a decrease after the adsorption of two such oxidizing gases due to the lower electron activity and density of this media. Our calculations are meaningful as they can supply experimentalists with potential sensing material prospects with which to exploit chemical sensors.
Cui, Chang-Hao,Fu, Yaoyao,Jeon, Byeong-Min,Kim, Sun-Chang,Im, Wan-Taek The Korean Society of Ginseng 2020 Journal of Ginseng Research Vol.44 No.6
Background: The separation of isomeric compounds from a mixture is a recurring problem in chemistry and phytochemistry research. The purification of pharmacologically active ginsenoside Rb<sub>3</sub> from ginseng extracts is limited by the co-existence of its isomer Rb<sub>2</sub>. The aim of the present study was to develop an enzymatic elimination-combined purification method to obtain pure Rb<sub>3</sub> from a mixture of isomers. Methods: To isolate Rb<sub>3</sub> from the isomeric mixture, a simple enzymatic selective elimination method was used. A ginsenoside-transforming glycoside hydrolase (Bgp2) was employed to selectively hydrolyze Rb<sub>2</sub> into ginsenoside Rd. Ginsenoside Rb<sub>3</sub> was then efficiently separated from the mixture using a traditional chromatographic method. Results: Chromatographic purification of Rb<sub>3</sub> was achieved using this novel enzymatic elimination-combined method, with 58.6-times higher yield and 13.1% less time than those of the traditional chromatographic method, with a lower minimum column length for purification. The novelty of this study was the use of a recombinant glycosidase for the selective elimination of the isomer. The isolated ginsenoside Rb<sub>3</sub> can be used in further pharmaceutical studies. Conclusions: Herein, we demonstrated a novel enzymatic elimination-combined purification method for the chromatographic purification of ginsenoside Rb<sub>3</sub>. This method can also be applied to purify other isomeric glycoconjugates in mixtures.
Hao Cui,박시현 한국광학회 2014 Current Optics and Photonics Vol.18 No.6
We report a numerical analysis of the light-extraction efficiency (LEE) of light-emitting diodes (LEDs) on patterned sapphire substrates (PSSs). We considered various n-sided, regular convex pyramids, where n is an integer and n ≥ 3. We then considered four cross sections: extruded, subtracted, truncated-extruded, and truncated-subtracted. Ray-tracing simulations were carried out with these polygonal pyramid patterns, and the dimensions of the patterns were systematically varied. Optimized pattern shapes were determined for large LEE. An extruded circular pyramid with a slant angle of 45° was found to be the optimal patterned shape.