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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.
( 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.
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.
A Prospective Technique for Damage Detection in Truss Structures Using the Fusion of DNN with AVOA
Quyet Huu Nguyen,Thang Xuan Le,Dang Le Minh Nguyen,Thanh Tien Bui,Nhung Cam Nguyen Thi,Hoa Tran 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.7
In recent decades, the integration of optimization methods and Machine Learning (ML) models has garnered significant attention within the research community. In the pursuit of establishing a symbiotic relationship between ML and optimization algorithms, this study focuses on the fusion of the African Vulture Optimization Algorithm (AVOA) - an optimization algorithm inspired by the foraging behavior of African vultures - with Deep Neural Networks (DNNs) - a prevalent model in ML for damage detection of a real large-scale bridge. In this research, AVOA, possessing a vast search space and the ability to autonomously adjust crucial parameters during the search process, such as flight velocity and learning rate, is employed to select informative features such as weight and biases of DNNs. This synergy allows the network to automatically adjust its potential. The technique is applied to a truss bridge, utilizing Finite Element Model (FEM) data that has been validated by real-world vibration measurements, resulting in precise damage identification even in the presence of white Gaussian noise. Evaluation criteria demonstrate enhanced accuracy and computational efficiency compared to the traditional neural network approach.
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.
Dual use of tantalum disulfides as hole and electron extraction layers in organic photovoltaic cells
Le, Quyet Van,Nguyen, Thang Phan,Choi, Kyoung Soon,Cho, Yoon-Ho,Hong, Young Joon,Kim, Soo Young The Royal Society of Chemistry 2014 Physical chemistry chemical physics Vol.16 No.46
<P>UV/ozone treated (UVO-treated) TaS<SUB>2</SUB> and non-treated TaS<SUB>2</SUB> nanosheets are introduced into organic photovoltaic cells (OPVs) as hole extraction layers (HEL) and electron extraction layers (EEL). TaS<SUB>2</SUB> nanosheets are obtained <I>via</I> ultrasonic vibration and size-controlled by centrifugation. Atomic force microscopy (AFM) images reveal that the thickness and lateral size of TaS<SUB>2</SUB> nanosheets are approximately 1 and 70 nm, indicating that uniform and ultrathin TaS<SUB>2</SUB> nanosheets are obtained. The work function of TaS<SUB>2</SUB> increases from 4.4 eV to 4.9–5.1 eV after applying UVO treatment by forming Ta<SUB>2</SUB>O<SUB>5</SUB>. In addition, the power conversion efficiencies of normal OPV with UVO-treated TaS<SUB>2</SUB> and inverted OPV with TaS<SUB>2</SUB> are 3.06 and 2.73%, which are higher than those of OPV without TaS<SUB>2</SUB> (1.56% for normal OPV and 0.22% for inverted OPV). These results indicate that TaS<SUB>2</SUB> is a promising material for HEL and EEL layers in OPVs.</P> <P>Graphic Abstract</P><P>Organic photovoltaic cells with a UVO-treated TaS<SUB>2</SUB> hole extraction layer. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp04412f'> </P>
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>