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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.
Preparation and properties of Bi-based lead-free ceramic multilayer actuators
Van-Quyet Nguyen 한양대학교 세라믹연구소 2012 Journal of Ceramic Processing Research Vol.13 No.S1
Lead-free (Bi0.5Na0.41K0.09)TiO3 (BNKT) multilayer ceramic actuators were prepared using tape-casting and screen-printing techniques. Co-firing behavior of BNKT/AgPd laminates was examined as a function of sintering temperature. It was found that co-firing induced bending and electrical properties were very sensitive to sintering condition. By optimizing sintering conditions, lead-free electrostrictive multilayer actuators with normalized strain Smax/Emax of 266 pm/V have been successfully fabricated, which is promising for lead-free actuator applications.
A Study on Visual Feedback Control of Robot Arm
Van-Quyet Nguyen,Jun-Hong Kim,Suk-Bum Yoon,Young-Gyun Yoo,Sung-Hyun Han 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
This paper presents how it is effective to use many features for improving the speed and the accuracy of the visual servo systems. Some rank conditions, which relate the image Jacobian, and the control performance are derived. It is also proven that the accuracy is improved by increasing the number of features. Effectiveness of the redundant features is verified by the real time experiments on a Dual-Arm Robot manipulator made by Samsung Electronics Co. Ltd.
A Study on Obstacle Avoidance of Mobile Robot
Van-Quyet Nguyen,Se-Bong Oh,Hyen-Chul Ro,Chang-Jae Cho,Sung-Hyun Han 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
We present a new technique to autonomous navigation based on ultrasonic sensors for mobile robots travelling through the narrow aisle that leave only a few centimeters on each side between the guides and the robot. In our current implementation the ultrasonic sensor system fires at a rate of 100 ms, that is, each of the 8 sensors fires once during each 100 ms interval. This is a very fast firing rate, implemented here for optimal performance. This paper presents an extensively tested and verified solution to the problem. Our solution is based on the optimal placement of ultrasonic sensors at strategic locations around the robot. Both the sensor location and the associated navigation algorithm are defined in such a way that only the accurate radial sonar data is used for servoing.