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Robust Precoding and Postcoding for Multicell Multiuser Transmission using Imperfect CSI
Hung Nguyen-Le,Vien Nguyen-Duy-Nhat,Chien Tang-Tan,Vo Nguyen Quoc Bao 한국통신학회 2016 Journal of communications and networks Vol.18 No.5
This paper studies the problem of precoding and post-coding design for multicellmultiuser downlink transmissions in theabsence of perfect channel state information (CSI). Using statisti-cal information of imperfect CSI, an iterative multiuser multicelltransceiver design is formulated by minimizing the mean squarederror (MSE) cost function of signal and leakage interference underper-base station power constraint (PBPC). The convergence of theiterative precoding and postcoding algorithm is verified by analyt-ical and empirical results. The proposed precoding and postcodingalgorithm offers a low computational complexity and robustnessagainst CSI imperfection.
Factors Affecting the Intention to Apply Management Accounting in Enterprises in Vietnam
NGUYEN, Hung Quoc,LE, Oanh Thi Tu Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.6
By applying behavioral intention theories and the theory of diffusion of innovation in organizations, this study identified several factors influencing the intention to apply management accounting in enterprises in Vietnam. Research data was collected from the questionnaire sent to Vietnamese enterprises in 2019, collecting 542 observations from accountants and directors. The data is, then, synthesized by excel file, conformity check, and processed by SPSS 20 software with descriptive statistics and multiple regression analysis. The results showed four factors that affect the intention to apply management accounting in enterprises in Vietnam: (1) Performance expectancy; (2) Effort expectancy; (3) Perceived trust; and (4) Subjective norms. The study pointed out that the above factors explain 60.618% of the variation of "intention to apply management accounting", in which, Subjective norms has the strongest impact (regression coefficient is 0.238). The findings also show that raising the awareness of managers and accountants about the role of management accounting, improving the qualifications and knowledge of accountants, and increasing the trust of managers about management accounting information are needed to increase the level of management accounting application in Vietnamese enterprises. The study also proposes recommendations to improve the effectiveness of management accounting for managers in operation and decision-making.
Robust Precoding and Postcoding for Multicell Multiuser Transmission using Imperfect CSI
Nguyen-Le, Hung,Nguyen-Duy-Nhat, Vien,Tang-Tan, Chien,Bao, Vo Nguyen Quoc The Korea Institute of Information and Commucation 2016 Journal of communications and networks Vol.18 No.5
This paper studies the problem of precoding and post-coding design for multicell multiuser downlink transmissions in the absence of perfect channel state information (CSI). Using statistical information of imperfect CSI, an iterative multiuser multicell transceiver design is formulated by minimizing the mean squared error (MSE) cost function of signal and leakage interference under per-base station power constraint (PBPC). The convergence of the iterative precoding and postcoding algorithm is verified by analytical and empirical results. The proposed precoding and postcoding algorithm offers a low computational complexity and robustness against CSI imperfection.
Islam Cham Community in Phum Soai Hamlet: Now and Future
Nguyen Quoc Hung,Vu Van Nam,Le Thi Minh Thu 세계문화관광학회 2019 International Journal of Culture and tourism Resea Vol.12 No.1
If someone has a chance to come to Phum Soai hamlet in Chau Phong commune, Tan Chau town, An Giang province, they will have the opportunity to experience the interesting things about the life of the Muslim Cham community for hundreds of years. It is like a living museum, preserving traditional livelihoods, religious life, religious architectural works of Cham Muslims for generations. Within the scope of this article, the authors will summarize the results from the field trip at Phum Soai hamlet so that those who are interested have more information about life, culture and future development of the Islam Cham community here.
Bang Quoc Ho,Hoang Ngoc Khue Vu,Thoai Tam Nguyen,Thi Thuy Hang Nguyen,Ricardo Simon Carbajo,Quan Le,Rajnish Rakholia 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
Air in Ho Chi Minh city is polluted by PM2.5 (particle matter with the diameter is less than 2.5 μm, so-called PM2.5), O₃, CO, NO₂ and TSP which greatly affects public health. Ho Chi Minh City (HCMC) had 8,640,000 inhabitants with a total of 7,339,552 motorcycles and 637,323 automobiles. There are about 2,807 factories releasing air emission, 2,061,957 household and 5,096 restaurants in the city. A comprehensive study is required to evaluate causes of air pollution and the impacts of air pollution level to public health in this city. The aim of this study is to: (i) Application EMISENS model and other tools to calculate air emission in HCMC and (ii) Modelling the Impact of Air Pollution on Public Health in Ho Chi Minh City for Policy Making and Awareness Creation using Machine Learning. The results showed that comprehensive EI and GHG over HCMC in 2019 was conducted in this project by following the top-down and bottom-up approaches and IPCC-2006 methodology. The estimation of the emission of different types of sources including line, point, area, and the biogenic source was conducted. Traffic sources accounted for the largest emissions for almost all pollutants. Motorcycles were the dominant emission source of all pollutants for on-road sources, accounting for 35.3%, 91.4%, 65.4%, 70.4%, 99.4% and 79.9% of the total line sources emissions for NOx, CO, SOx, NMVOC, CH₄ and PM2.5, respectively. Industrial activities contributed the highest emission of PM2.5 about 39.7% of the total of PM2.5 in HCMC in 2019. The area sources accounted for 38.9% of TSP and 23.5% of PM2.5 in HCMC, whereas, others were negligible sources. Biogenic sources, particularly from greenery, agriculture, mangroves, etc. of the HCMC emitted 4.6% of total NMVOC emissions of the whole city. Motorcycles contributed the highest emission of PM2.5 for all single sources of emission in HCMC. For PM2.5, motorbikes contribute 24.5% of HCMC"s total PM2.5 emissions, Households, Textiles, Metal Production, Food, Restaurants, Seaports, Manufacturing Paper respectively is 15.1, 10.0, 9.1, 6.8, 6.7, 5.8 and 3.8, respectively. With SO₂, motorcycles, Thermo-electricity, Seaports, Textile, Cars, Food, Metal production and HDVs contribute 24.6, 20.7, 11.7, 8.6, 6.6, 5.5, 5.0 and 3.8% of total SO₂ emission of HCMC. Study also develop air quality automatically monitoring network and install 6 air quality stations around HCMC, then apply Machine Learning to analysis/extrapolate hourly air quality data for HCMC, then modeling the the Impact of air Pollution on hospital admission in HCMC. The 13 measure to reduce air pollutants should be based on this detailed EI emission.
Hai Le Xuan,Quoc-Dong Hoang,Soon Geul Lee,Dat Pham Xuan,Hoang Tran Viet,Minh Pham Van,Hung Pham Van,Hung Pham Viet,PHAM DUC TUAN,Duc Anh Nguyen 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.2
Ballbots, which have been studied for over ten years, are under-actuated mobile robots that operate using the inverted pendulum paradigm. Controlling a ballbot poses a number of challenges, including maintaining the stable upright posture from the ground in all directions and making sure it follows the desired trajectory. External factors such as a minor change in contact surface properties or fabrication errors can affect the system's stabilization and transfer capabilities. In this study, an adaptive hierarchical sliding mode control algorithm based on an artificial neural network is developed to make the ballbot robust to external factors. The use of the proposed controller ensures system stability despite uncertainties including friction, accidental centrifugal forces and gravity that occur when the ballbot follows the reference trajectory. The system stability is guaranteed on the basis of Lyapunov theory. Control efficiency and robot stability under system uncertainties are demonstrated by numerical simulation.
The Capacity of Applying Electrical Resistance Probe in Natural Corrosion Tests of Vietnam
San, Pham Thy,Lien, Le Thi Hong,Hung, Le Quoc 한국부식방식학회 2003 Corrosion Science and Technology Vol.2 No.2
The Electrical Resistance Probe of carbon steel and weight loss coupons were exposed in atmosphere and in the lake water of Hanoi. The comparison of data received by two methods after one year exposure was presented. The correspondence of the data of these methods on the exposure time in both environments showed a capacity of using Electrical Resistance Probe in Vietnamese natural corrosion testing of Carbon steel.
Ha Thi Thu Vu,Hanh Thi Vinh Le,Yen Thi Hai Pham,Hung Quoc Le,Phong Hong Pham 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.3
Different kinds of materials for electrodes based on glassy carbon, carbon fibers, and modified by an ionic liquid (BMIMBF4) were used to determine 2,4,6-trinitrotoluene (TNT) in water environment by differential pulse adsorptive stripping voltammetry. The modified electrode based on BMIMBF4 showed a better performance than those based on the microelectrode and glassy carbon electrode (GCE) in term of sensitivity. The best performance was obtained with the ionic liquid-modified electrode with 80:10:10 (w/w/w) of the graphite powder/paraffin oil/BMIMBF4 composition in PBS, pH 8. The TNT concentration was linear in the range 1.5 to ~30 ppm for all studied electrodes (r = 0.9978) with a detection limit of 88.6 ppb using IL-CPE (ionic liquid-modified carbon paste electrode). This latter electrode was used to measure real samples taken from Red River, Vietnam. The recovery study for TNT in natural samples gave values from 99.7% to 103.3%. IL-CPE demonstrated long-term stability and reproducibility, with a relative standard deviation of 1.67%.