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ASYMPTOTIC BEHAVIOR OF STRONG SOLUTIONS TO 2D g-NAVIER-STOKES EQUATIONS
Quyet, Dao Trong Korean Mathematical Society 2014 대한수학회논문집 Vol.29 No.4
Considered here is the first initial boundary value problem for the two-dimensional g-Navier-Stokes equations in bounded domains. We first study the long-time behavior of strong solutions to the problem in term of the existence of a global attractor and global stability of a unique stationary solution. Then we study the long-time finite dimensional approximation of the strong solutions.
Changes in Income Distribution During the COVID-19 Pandemic: Empirical Evidence from Vietnam
Quyet Thang DAO,Thi Yen LE,Van Hung PHAM 한국유통과학회 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.1
This study examines changes in income for Vietnam’s service labors during COVID-19. A person’s income depends on several factors, such as educational level, working area, the number of activities creating jobs, the cost of living, investment, etc. This research was based on a survey of 479 workers in Vietnam’s service sector, who were evenly distributed across sectors (tourism and aviation) and workplaces (State and private). Based on the collected data, the REM regression model was used to analyze the factors influencing employee income when COVID-19 took place. The research returns show that the COVID-19 pandemic has had a considerable influence on labor incomes, and there are income disparities that exist between workers by work area and by gender. This study indicates that workers’ wages in Vietnam decreased by an average of 12.22 million VND per month after the outbreak of COVID-19. In addition, the results also show that the income of workers after COVID-19 differs depending on their position (the average salary of laborers working in the public sector is about 3.946 million VND higher than the average salary of laborers in the private sector); furthermore, the incomes of workers also vary by gender.
( Quyet Tien Phi ),( Yu Mi Park ),( Keyung Jo Seul ),( Choong Min Ryu ),( Seung Hwan Park ),( Jong Guk Kim ),( Sa Youl Ghim ) 한국미생물 · 생명공학회 2010 Journal of microbiology and biotechnology Vol.20 No.12
Twenty-nine P. polymyxa strains isolated from rhizospheres of various crops were clustered into five genotypic groups on the basis of BOX-PCR analysis. The characteristics of several plant growth-promoting factors among the isolates revealed the distinct attributes in each allocated group. Under gnotobiotic conditions, inoculation of pepper roots with P. polymyxa isolates significantly increased the biomass in 17 of total 29 treated plants with untreated plants. Experiments on induced systemic resistance (ISR) against bacterial spot pathogen Xanthomonas axonopodis pv. vesicatoria in pepper by P. polymyxa strains were conducted and only one isolate (KNUC265) was selected. Further studies into ISR mediation by the KNUC265 strain against the soft-rot pathogen Erwinia carotovora subsp. carotovora in tobacco demonstrated that the tobacco seedlings exposed to either bacterial volatiles or diffusible metabolites exhibited a reduction in disease severity. In conclusion, ISR and plant growth promotion triggered by P. polymyxa isolates were systemically investigated on pepper for the first time. The P. polymyxa KNUC265 strain, which elicited both ISR and plant growth promotion, could be potentially used in improving the yield of pepper and possibly of other crops.
PULLBACK ATTRACTORS FOR 2D g-NAVIER-STOKES EQUATIONS WITH INFINITE DELAYS
Quyet, Dao Trong Korean Mathematical Society 2016 대한수학회논문집 Vol.31 No.3
We consider the first initial boundary value problem for the 2D non-autonomous g-Navier-Stokes equations with infinite delays. We prove the existence of a pullback $\mathcal{D}$-attractor for the continuous process associated to the problem with respect to a large class of non-autonomous forcing terms.
Low Temperature Solution-Processable Cesium Lead Bromide Microcrystals for Light Conversion
Le, Quyet Van,Lee, Jong Won,Sohn, Woonbae,Jang, Ho Won,Kim, Jong Kyu,Kim, Soo Young The American Chemical Society 2018 CRYSTAL GROWTH AND DESIGN Vol.18 No.5
<P>In this report, we present a new approach for the fabrication and application of Cs<SUB>4</SUB>PbBr<SUB>6</SUB> microcrystals (Cs<SUB>4</SUB>PbBr<SUB>6</SUB> MCs). The Cs<SUB>4</SUB>PbBr<SUB>6</SUB> MCs are synthesized via an anti-solvent induced crystallization of PbBr<SUB>2</SUB>:CsBr directly in dimethylsulfoxide (DMSO) by introducing HBr (HBr, 48% aqueous solution). The ratio of HBr and DMSO plays a vital role in the formation of Cs<SUB>4</SUB>PbBr<SUB>6</SUB>. By controlling the HBr/DMSO ratio, pure Cs<SUB>4</SUB>PbBr<SUB>6</SUB> or the CsPbBr<SUB>3</SUB> phase can be obtained. The Cs<SUB>4</SUB>PbBr<SUB>6</SUB> MCs were initially obtained by adding HBr to CsBr:PbBr<SUB>2</SUB>/DMSO. However, on increasing the amount of the added HBr, Cs<SUB>4</SUB>PbBr<SUB>6</SUB> MCs were converted to CsPbBr<SUB>3</SUB> MCs and the photoluminescence (PL) disappeared. It was also found that CsPbBr<SUB>3</SUB> MCs can be transformed to Cs<SUB>4</SUB>PbBr<SUB>6</SUB> MCs by simply adding DMSO to the dried CsPbBr<SUB>3</SUB> MCs. The Cs<SUB>4</SUB>PbBr<SUB>6</SUB> MCs exhibit a strong PL at 516 nm with a full width at half-maximum of 25 nm regardless of the crystal size (5-10 μm). On using Cs<SUB>4</SUB>PbBr<SUB>6</SUB> MCs as a light converter in ultraviolet light emitting diodes, a PL intensity that is 3 times higher than that of CsPbBr<SUB>3</SUB> quantum dots based devices could be achieved, unraveling the potential of this material for optoelectronic applications.</P><P>Cs<SUB>4</SUB>PbBr<SUB>6</SUB> microcrystals (MCs) are synthesized through a low temperature solution process using hydrobromic acid and dimethyl sulfoxide. The resulting Cs<SUB>4</SUB>PbBr<SUB>6</SUB> MCs exhibit bright green luminescence at 516 nm regardless of crystal size. The use of Cs<SUB>4</SUB>PbBr<SUB>6</SUB> MCs as light conversion materials shows 3 times higher photoluminescence than that of CsPbBr<SUB>3</SUB> quantum dots, revealing their potential in optoelectronic devices.</P> [FIG OMISSION]</BR>
Le, Quyet Van,Nguyen, Thang Phan,Jang, Ho Won,Kim, Soo Young The Royal Society of Chemistry 2014 Physical Chemistry Chemical Physics Vol.16 No.26
<P>MoS<SUB>2</SUB> nanosheets obtained through a simple sonication exfoliation method are employed as a hole-extraction layer (HEL) to improve the efficiency and air stability of organic photovoltaic cells (OPVs). The reduction in the wavenumber difference, appearance of a UV-vis peak, and atomic force microscopy images indicate that MoS<SUB>2</SUB> nanosheets are formed through the sonication method. The OPVs with MoS<SUB>2</SUB> layers show a degraded performance with a power conversion efficiency (PCE) of 1.08%, which is lower than that of OPVs without HEL (1.84%). After performing the UV/ozone (UVO) treatment of the MoS<SUB>2</SUB> surface for 15 min, the PCE value increases to 2.44%. Synchrotron radiation photoelectron spectroscopy data show that the work function of MoS<SUB>2</SUB> increases from 4.6 to 4.9 eV upon UVO treatment, suggesting that the increase in the PCE value is caused by the bandgap alignment. Upon inserting poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) between MoS<SUB>2</SUB> and the active layer, the PCE value of the OPV increases to 2.81%, which is comparable with that of the device employing only PEDOT:PSS. Furthermore, the stability of the OPVs is improved significantly when MoS<SUB>2</SUB>/PEDOT:PSS layers are used as the HEL. Therefore, it is considered that the use of UVO-treated MoS<SUB>2</SUB> may improve the stability of OPV cells without degrading the device performance.</P> <P>Graphic Abstract</P><P>A longer lifetime was achieved for devices using MoS<SUB>2</SUB>/PEDOT:PSS layers than for those employing only the PEDOT:PSS layer. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp01598c'> </P>
Van-Quyet Nguyen,홍창효,이현영,공영민,이재신,안경관 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.6
The effects of Li substitution on the crystal structure and the strain properties of Bi<sub>0.5</sub>-(Na<sub>0.82</sub>K<sub>0.18</sub>)<sub>0.5</sub>(Ti<sub>0.95</sub>Sn<sub>0.05</sub>)O<sub>3</sub> ceramics have been investigated. Li substitution enhanced the grain growth and densification, as well as the electric-field-induced strain (EFIS).Without Li substitution, the EFIS was 0.31% under a dc field of 6 kV/mm. However, the EFIS was enhanced to 0.39% when 4 mol% Na was replaced with Li, resulting in a normalized strain (<i>S<sub>max</sub>/E<sub>max</sub></i>) of 646 pm/V. The enhanced strain could be attributed to the increased flexibility in the lattice caused by simultaneous substitutions with both A-site Li ions and B-site Sn ions.