Quân Minh - Academia.edu (original) (raw)

Papers by Quân Minh

Research Square (Research Square), Mar 22, 2023

Most of the current task-oriented dialogue systems (ToD), despite having interesting results, are... more Most of the current task-oriented dialogue systems (ToD), despite having interesting results, are designed for a handful of languages such as Chinese and English. Therefore, their performance in low-resource languages is still a significant problem due to the absence of a standard dataset and evaluation policy. To address this problem, we proposed ViWOZ, a fully-annotated Vietnamese task-oriented dialogue dataset. ViWOZ is the first large scale, multi-turn, multi-domain, task-oriented dataset in Vietnamese, a low-resource language. The dataset consists of 5,000 dialogues in total, including 60,946 fully annotated utterances. Furthermore, we provide a comprehensive benchmark for both modular and endto-end models in low-resource language scenarios. With those characteristics, the ViWOZ dataset enables future studies on the construction of multilingual task-oriented dialogue systems.

Tạp chí Khoa học và Công nghệ Biển, Jun 30, 2021

Samples of soft coral Sinularia flexibilis were collected in February, May, August, November in N... more Samples of soft coral Sinularia flexibilis were collected in February, May, August, November in Nha Trang, Khanh Hoa. The content of molecular species in phosphatidylethanolamine class in the lipid of obtained coral samples has been determined. Identified 14 types of PE molecule species, in which the alkenylacyl PE 18:1e/20:4 has the highest concentration, ranging from 51.35% to 63.16% in 4 samples, the highest and lowest concentrations were in a sample collected in August and November, respectively. Samples collected in August and May have a lower diacyl PE ratio than samples collected in November and February. This study identified the lowest alkylacyl and the highest alkenylacyl concentration in a sample collected in August. The fatty acids present in this class

Vietnam Journal of Education, Dec 29, 2021

Drawing on the evaluations of students' attitudes toward learning aspects the mixed-method resear... more Drawing on the evaluations of students' attitudes toward learning aspects the mixed-method research aims to examine the prospects of Blended Learning at FPT University in Can Tho. Four hundred sixty-seven students partook in the study by providing answers for a 30-item questionnaire with open-ended questions. The results showed that most students have positive attitudes towards factors constructing their Blended Learning adaptability, including (1) Study Management and Online Learning, (2) Classroom Learning, and (3) Learning Flexibility. The results of Binary Logistic Regression also clarified the good promise of Blended Learning implementation and the discovery of other concerns that hindered informants' willingness, namely Worriment about Learning Effectiveness, Online Learning Barriers, and Learners' Ego. The research findings served as a reference for FPT University and other higher institutions to better grasp how students perceive Blended Learning to develop strategies for successful practices.

International journal of Earth Sciences and Engineering, 2011

日本水処理生物学会誌. 別巻 = Journal Japan Biological Society of Water and Waste, Oct 15, 2010

... Up-flow anaerobic treatment of low-strength wastewater using PVA gel beads. KHANH Do Phuong; ... more ... Up-flow anaerobic treatment of low-strength wastewater using PVA gel beads. KHANH Do Phuong; Graduate School of Science and Technology, Kumamoto University. QUAN Lai Minh; Graduate School of Science and Technology, Kumamoto University. ...

Tạp chí Khoa học và Công nghệ Biển, Mar 31, 2022

Samples of soft coral Sinularia flexibilis were collected for one year, from January to December,... more Samples of soft coral Sinularia flexibilis were collected for one year, from January to December, in the Nha Trang coastal area, Khanh Hoa province, to assess the month-by-month fluctuation of total lipid content and lipid classes composition in this species. Full lipid content reached the highest value from March to May, lower in the period of June-September, and bottomed in October and November. There was a significant decrease in this content between May and June, September and October; the content increased from February to March but was not stable from October to February. The lipid classes composition of Sinularia flexibilis includes polar lipids (PL), sterols (ST), triacylglycerol (TAG), monoalkyldiacyl-glycerol (MADAG), wax (W), and free fatty acids (FFA). The concentration of PL in summer (April-August) was lower than that in winter (September-February); this content increased significantly during November-December; meanwhile, it was observed to decrease in April-May, December-January. The content of ST increased from October to March and declined from April to September. The remaining classes, including W, MADAG, and TAG, tend to grow in the summer and decline in the other months. The fluctuation of lipid class composition throughout the year is closely related to zooxanthellae microalgae in corals at different times of the year and is directly influenced by environmental conditions, especially seawater temperature. Besides, this coral's maturation and reproduction effect with the increase or release of reproductive materials was also observed.

JOURNAL OF ASIAN BUSINESS AND ECONOMIC STUDIES

Nghiên cứu đã dựa vào Thuyết bản sắc xã hội để kiểm tra mối quan hệ giữa trải nghiệm khách hàng v... more Nghiên cứu đã dựa vào Thuyết bản sắc xã hội để kiểm tra mối quan hệ giữa trải nghiệm khách hàng và hành vi gắn kết khách hàng của dịch vụ du lịch sức khoẻ trong bối cảnh hậu Covid-19. Phương pháp nghiên cứu định tính và định lượng được phối kết hợp để thực hiện nghiên cứu. Bộ dữ liệu được thu thập từ cuộc khảo sát với 198 du khách đã được phân tích mô hình cấu trúc bình phương tối thiểu từng phần (PLS-SEM). Kết quả nghiên cứu cho thấy có mối quan hệ tích cực giữa trải nghiệm khách hàng và hành vi gắn kết khách hàng thông qua vai trò trung gian của nhận diện khách hàng-nhân viên và nhận diện khách hàng-tổ chức. Từ kết quả tìm thấy, nghiên cứu đề xuất một số hàm ý quản trị trong ngành dịch vụ du lịch sức khoẻ nhằm thiết kế trải nghiệm khách hàng phù hợp để làm gia tăng hành vi gắn kết khách hàng trong bối cảnh hậu Covid-19. Cuối cùng, nghiên cứu đưa ra một số hạn chế và hướng nghiên cứu tiếp theo.

JOURNAL OF ASIAN BUSINESS AND ECONOMIC STUDIES

Nghiên cứu kiểm tra mối liên hệ giữa mục tiêu đa dạng hóa và kết quả hoạt động của công ty. Đồng ... more Nghiên cứu kiểm tra mối liên hệ giữa mục tiêu đa dạng hóa và kết quả hoạt động của công ty. Đồng thời, nghiên cứu kiểm tra vai trò trung gian của năng lực kết nối trong mối quan hệ này. Kết quả phân tích dựa trên khảo sát do 285 lãnh đạo các công ty hoạt động tại thành phố Hồ Chí Minh cho thấy mối quan hệ giữa mục tiêu đa dạng hóa và kết quả hoạt động của công ty không có ý nghĩa thống kê. Đồng thời, năng lực kết nối đóng vai trò trung gian trong mối quan hệ này. Kết quả này đã đóng góp cho lý thuyết về nguồn lực và gợi ý những hàm ý quản trị giúp doanh nghiệp tại thành phố Hồ Chí Minh xây dựng năng lực kết nối, nhằm thúc đẩy kết quả hoạt động của công ty.

International Journal of Advanced Computer Science and Applications

Imbalanced datasets usually appear popularly to many real-world applications and studies. For met... more Imbalanced datasets usually appear popularly to many real-world applications and studies. For metagenomic data, we also face the same issue where the number of patients is greater than the number of healthy individuals or vice versa. In this study, we propose a method to handle the imbalanced datasets issues by Cost-sensitive approach. The proposed method is evaluated on an imbalanced metagenomic dataset related to Inflammatory bowel disease to do prediction tasks. Our method reaches a noteworthy improvement on prediction performance with deep learning algorithms including a MultiLayer Perceptron and a Convolutional Neural Neural Network with the proposed cost-sensitive for Metagenome-based Disease Prediction tasks.

arXiv (Cornell University), Mar 15, 2022

Most of the current task-oriented dialogue systems (ToD), despite having interesting results, are... more Most of the current task-oriented dialogue systems (ToD), despite having interesting results, are designed for a handful of languages like Chinese and English. Therefore, their performance in low-resource languages is still a significant problem due to the absence of a standard dataset and evaluation policy. To address this problem, we proposed ViWOZ, a fully-annotated Vietnamese task-oriented dialogue dataset. ViWOZ is the first multi-turn, multi-domain tasked oriented dataset in Vietnamese, a low-resource language. The dataset consists of a total of 5,000 dialogues, including 60,946 fully annotated utterances. Furthermore, we provide a comprehensive benchmark of both modular and end-to-end models in lowresource language scenarios. With those characteristics, the ViWOZ dataset enables future studies on creating a multilingual task-oriented dialogue system.

2021 17th IEEE International Conference on Advanced Video and Signal Based Surveillance (AVSS), 2021

People detection in top-view, fish-eye images is challenging as people in fish-eye images often a... more People detection in top-view, fish-eye images is challenging as people in fish-eye images often appear in arbitrary directions and are distorted differently. Due to this unique radial geometry, axis-aligned people detectors often work poorly on fish-eye frames. Recent works account for this variability by modifying existing anchorbased detectors or relying on complex pre/post-processing. Anchor-based methods spread a set of pre-defined bounding boxes on the input image, most of which are invalid. In addition to being inefficient, this approach could lead to a significant imbalance between the positive and negative anchor boxes. In this work, we propose ARPD, a singlestage anchor-free fully convolutional network to detect arbitrarily rotated people in fish-eye images. Our network uses keypoint estimation to find the center point of each object and regress the object's other properties directly. To capture the various orientation of people in fish-eye cameras, in addition to the center and size, ARPD also predicts the angle of each bounding box. We also propose a periodic loss function that accounts for angle periodicity and relieves the difficulty of learning small-angle oscillations. Experimental results show that our method competes favorably with state-of-the-art algorithms while running significantly faster.

Journal of Military Science and Technology, 2021

Currently, the high penetration of photovoltaic energy (PV) in the power system raises many chall... more Currently, the high penetration of photovoltaic energy (PV) in the power system raises many challenges due to the instability of this type of energy. To overcome this problem, this study analyzes the Power Factor Correction (PFC) control technique through the existing power grid to support converters integrated with the MPPT algorithm. Then, an experimental circuit model integrating two control methods will be fabricated and evaluated under the actual operating conditions. The experimental process shows that in the case of PFC support, output voltage response is more stable than the case that only uses the simple MPPT algorithm.

Chemistry & Biodiversity, 2021

A new racemic xanthone, garmckeanin A (1), and eight known analogs 2–9 were isolated from the eth... more A new racemic xanthone, garmckeanin A (1), and eight known analogs 2–9 were isolated from the ethyl acetate (AcOEt) extract of the Vietnamese Garcinia mckeaniana leaves. Their structures were determined by MS and NMR spectral analyses and compared with the literature. The AcOEt extract showed good cytotoxicity against cancer cell lines KB, Lu, Hep‐G2 and MCF7, with IC50 values of 5.40–8.76 μg/mL, and it also possessed α‐glucosidase inhibitory activity, with an IC50 value of 9.17 μg/mL. Garmckeanin A (1) exhibited inhibition of all cancer cell lines, with an IC50 value of 7.3–0.9 μM. Allanxanthone C (5) successfully controlled KB growth, with an IC50 value of 0.54 μM, higher than that of the positive control, ellipticine (IC50 1.22 μM). Norathyriol (8) was a promising α‐glucosidase inhibitor, with an IC50 value of 0.07 μM, much higher than that of the positive control, acarbose (IC50 161.0 μM). The interactions of the potential α‐glucosidase inhibitors with the C‐ and N‐terminal doma...

Science & Technology Development Journal - Engineering and Technology, 2020

Currently, there have been no publications of using unmanned aerial vehicles (drones) in mine man... more Currently, there have been no publications of using unmanned aerial vehicles (drones) in mine management and supervision in Vietnam. Meanwhile, drones have been used in many fields worldwide, especially in exploitation management. Therefore, the purpose of this paper is to present the feasibility of applying unmanned aerial vehicles to the management of open-cast mines. The data of this research was collected from Ta Zon 2 quarry using Phantom 4 at two moments (October 2018 and February 2019). Through the methods of calibrating and processing images on specialized software, the authors obtained point cloud data sets and digital elevation models (DEM) of the mining area two times. In which, the point cloud is the key product of the research, this large and detailed data set helps to fully and accurately reproduce and process the DEM and 3D models of the mine area. Next, the authors compared and adjusted DEM of the mine area, resulting in fluctuations of the geological block in Ta Zon...

Journal of Economics Development, 2014

7th International Symposium on Quality Electronic Design (ISQED'06)

We propose an accurate architecture-level power estima- tion method for SRAM memories. This hybri... more We propose an accurate architecture-level power estima- tion method for SRAM memories. This hybrid method is composed of an analytical part for dynamic power estima- tion and a circuit-simulation backend used to obtain static leakage power values of all basic memory components. The method is flexible in that memory size is an arbitrary param- eter. In a comparison to circuit-level

Proceedings of the Sixth International Conference on Engineering Computational Technology

In this paper, the smoothed finite element method (SFEM) is proposed for 2D elastic problems by i... more In this paper, the smoothed finite element method (SFEM) is proposed for 2D elastic problems by incorporation of the cell-wise strain smoothing operation into the conventional finite elements. When a constant smoothing function is chosen, area integration becomes line integration along cell boundaries and no derivative of shape functions is needed in computing the field gradients. Both static and dynamic numerical examples are analyzed in the paper. Compared with the conventional FEM, the SFEM achieves more accurate results and generally higher convergence rate in energy without increasing computational cost. In addition, as no mapping or coordinate transformation is performed in the SFEM, the element is allowed to be of arbitrary shape. Hence the well-known issue of the shape distortion of isoparametric elements can be resolved. Index Terms-finite element method (FEM), Gauss quadrature, isoparametric element, smoothed finite element method (SFEM), strain smoothing.

Desalination and Water Treatment, 2014

This study evaluated nutrients removal from domestic wastewater by five plants in wetland roof sy... more This study evaluated nutrients removal from domestic wastewater by five plants in wetland roof systems (WR). The study plants include Arachis duranensis (1), Evolvulus alsinoides (2), Cosmos Bipinnuatus (3), Cyperus alternifolius Linn (4), and Philodendron hastatum (5). The WRs were acclimatized at hydraulic loading rates (HLR) of 220 m 3 /ha d and operated at HLR of 300 m 3 /ha d. The plants (1), (2), (4), and (5) had the ability to grow under the rooftop conditions with domestic wastewater as a nutrient source while the plant (3) was not suitable and dead after 20 d of operation. Generally, A. duranensis (1) and C. alternifolius Linn (4) were the most suitable plants treating domestic wastewater under the conditions of WR. The average phosphorus removal efficiencies of (1) and (4) were approximately 75 and 89%, respectively, while the average nitrogen removal efficiencies were 69 and 92%. The phosphorus accumulation in plants (1) and (4) during operation was 20.4 and 29.4%, respectively, while the nitrogen accumulation was 21.5 and 93%. It is concluded that C. alternifolius Linn (4) has best nutrient removal among the study plants under the conditions of shallow bed WR treating domestic wastewater (24 ± 4 and 2.0 ± 0.4 kg TP/ha d).

Research Square (Research Square), Mar 22, 2023

Most of the current task-oriented dialogue systems (ToD), despite having interesting results, are... more Most of the current task-oriented dialogue systems (ToD), despite having interesting results, are designed for a handful of languages such as Chinese and English. Therefore, their performance in low-resource languages is still a significant problem due to the absence of a standard dataset and evaluation policy. To address this problem, we proposed ViWOZ, a fully-annotated Vietnamese task-oriented dialogue dataset. ViWOZ is the first large scale, multi-turn, multi-domain, task-oriented dataset in Vietnamese, a low-resource language. The dataset consists of 5,000 dialogues in total, including 60,946 fully annotated utterances. Furthermore, we provide a comprehensive benchmark for both modular and endto-end models in low-resource language scenarios. With those characteristics, the ViWOZ dataset enables future studies on the construction of multilingual task-oriented dialogue systems.

Tạp chí Khoa học và Công nghệ Biển, Jun 30, 2021

Samples of soft coral Sinularia flexibilis were collected in February, May, August, November in N... more Samples of soft coral Sinularia flexibilis were collected in February, May, August, November in Nha Trang, Khanh Hoa. The content of molecular species in phosphatidylethanolamine class in the lipid of obtained coral samples has been determined. Identified 14 types of PE molecule species, in which the alkenylacyl PE 18:1e/20:4 has the highest concentration, ranging from 51.35% to 63.16% in 4 samples, the highest and lowest concentrations were in a sample collected in August and November, respectively. Samples collected in August and May have a lower diacyl PE ratio than samples collected in November and February. This study identified the lowest alkylacyl and the highest alkenylacyl concentration in a sample collected in August. The fatty acids present in this class

Vietnam Journal of Education, Dec 29, 2021

Drawing on the evaluations of students' attitudes toward learning aspects the mixed-method resear... more Drawing on the evaluations of students' attitudes toward learning aspects the mixed-method research aims to examine the prospects of Blended Learning at FPT University in Can Tho. Four hundred sixty-seven students partook in the study by providing answers for a 30-item questionnaire with open-ended questions. The results showed that most students have positive attitudes towards factors constructing their Blended Learning adaptability, including (1) Study Management and Online Learning, (2) Classroom Learning, and (3) Learning Flexibility. The results of Binary Logistic Regression also clarified the good promise of Blended Learning implementation and the discovery of other concerns that hindered informants' willingness, namely Worriment about Learning Effectiveness, Online Learning Barriers, and Learners' Ego. The research findings served as a reference for FPT University and other higher institutions to better grasp how students perceive Blended Learning to develop strategies for successful practices.

International journal of Earth Sciences and Engineering, 2011

日本水処理生物学会誌. 別巻 = Journal Japan Biological Society of Water and Waste, Oct 15, 2010

... Up-flow anaerobic treatment of low-strength wastewater using PVA gel beads. KHANH Do Phuong; ... more ... Up-flow anaerobic treatment of low-strength wastewater using PVA gel beads. KHANH Do Phuong; Graduate School of Science and Technology, Kumamoto University. QUAN Lai Minh; Graduate School of Science and Technology, Kumamoto University. ...

Tạp chí Khoa học và Công nghệ Biển, Mar 31, 2022

Samples of soft coral Sinularia flexibilis were collected for one year, from January to December,... more Samples of soft coral Sinularia flexibilis were collected for one year, from January to December, in the Nha Trang coastal area, Khanh Hoa province, to assess the month-by-month fluctuation of total lipid content and lipid classes composition in this species. Full lipid content reached the highest value from March to May, lower in the period of June-September, and bottomed in October and November. There was a significant decrease in this content between May and June, September and October; the content increased from February to March but was not stable from October to February. The lipid classes composition of Sinularia flexibilis includes polar lipids (PL), sterols (ST), triacylglycerol (TAG), monoalkyldiacyl-glycerol (MADAG), wax (W), and free fatty acids (FFA). The concentration of PL in summer (April-August) was lower than that in winter (September-February); this content increased significantly during November-December; meanwhile, it was observed to decrease in April-May, December-January. The content of ST increased from October to March and declined from April to September. The remaining classes, including W, MADAG, and TAG, tend to grow in the summer and decline in the other months. The fluctuation of lipid class composition throughout the year is closely related to zooxanthellae microalgae in corals at different times of the year and is directly influenced by environmental conditions, especially seawater temperature. Besides, this coral's maturation and reproduction effect with the increase or release of reproductive materials was also observed.

JOURNAL OF ASIAN BUSINESS AND ECONOMIC STUDIES

Nghiên cứu đã dựa vào Thuyết bản sắc xã hội để kiểm tra mối quan hệ giữa trải nghiệm khách hàng v... more Nghiên cứu đã dựa vào Thuyết bản sắc xã hội để kiểm tra mối quan hệ giữa trải nghiệm khách hàng và hành vi gắn kết khách hàng của dịch vụ du lịch sức khoẻ trong bối cảnh hậu Covid-19. Phương pháp nghiên cứu định tính và định lượng được phối kết hợp để thực hiện nghiên cứu. Bộ dữ liệu được thu thập từ cuộc khảo sát với 198 du khách đã được phân tích mô hình cấu trúc bình phương tối thiểu từng phần (PLS-SEM). Kết quả nghiên cứu cho thấy có mối quan hệ tích cực giữa trải nghiệm khách hàng và hành vi gắn kết khách hàng thông qua vai trò trung gian của nhận diện khách hàng-nhân viên và nhận diện khách hàng-tổ chức. Từ kết quả tìm thấy, nghiên cứu đề xuất một số hàm ý quản trị trong ngành dịch vụ du lịch sức khoẻ nhằm thiết kế trải nghiệm khách hàng phù hợp để làm gia tăng hành vi gắn kết khách hàng trong bối cảnh hậu Covid-19. Cuối cùng, nghiên cứu đưa ra một số hạn chế và hướng nghiên cứu tiếp theo.

JOURNAL OF ASIAN BUSINESS AND ECONOMIC STUDIES

Nghiên cứu kiểm tra mối liên hệ giữa mục tiêu đa dạng hóa và kết quả hoạt động của công ty. Đồng ... more Nghiên cứu kiểm tra mối liên hệ giữa mục tiêu đa dạng hóa và kết quả hoạt động của công ty. Đồng thời, nghiên cứu kiểm tra vai trò trung gian của năng lực kết nối trong mối quan hệ này. Kết quả phân tích dựa trên khảo sát do 285 lãnh đạo các công ty hoạt động tại thành phố Hồ Chí Minh cho thấy mối quan hệ giữa mục tiêu đa dạng hóa và kết quả hoạt động của công ty không có ý nghĩa thống kê. Đồng thời, năng lực kết nối đóng vai trò trung gian trong mối quan hệ này. Kết quả này đã đóng góp cho lý thuyết về nguồn lực và gợi ý những hàm ý quản trị giúp doanh nghiệp tại thành phố Hồ Chí Minh xây dựng năng lực kết nối, nhằm thúc đẩy kết quả hoạt động của công ty.

International Journal of Advanced Computer Science and Applications

Imbalanced datasets usually appear popularly to many real-world applications and studies. For met... more Imbalanced datasets usually appear popularly to many real-world applications and studies. For metagenomic data, we also face the same issue where the number of patients is greater than the number of healthy individuals or vice versa. In this study, we propose a method to handle the imbalanced datasets issues by Cost-sensitive approach. The proposed method is evaluated on an imbalanced metagenomic dataset related to Inflammatory bowel disease to do prediction tasks. Our method reaches a noteworthy improvement on prediction performance with deep learning algorithms including a MultiLayer Perceptron and a Convolutional Neural Neural Network with the proposed cost-sensitive for Metagenome-based Disease Prediction tasks.

arXiv (Cornell University), Mar 15, 2022

Most of the current task-oriented dialogue systems (ToD), despite having interesting results, are... more Most of the current task-oriented dialogue systems (ToD), despite having interesting results, are designed for a handful of languages like Chinese and English. Therefore, their performance in low-resource languages is still a significant problem due to the absence of a standard dataset and evaluation policy. To address this problem, we proposed ViWOZ, a fully-annotated Vietnamese task-oriented dialogue dataset. ViWOZ is the first multi-turn, multi-domain tasked oriented dataset in Vietnamese, a low-resource language. The dataset consists of a total of 5,000 dialogues, including 60,946 fully annotated utterances. Furthermore, we provide a comprehensive benchmark of both modular and end-to-end models in lowresource language scenarios. With those characteristics, the ViWOZ dataset enables future studies on creating a multilingual task-oriented dialogue system.

2021 17th IEEE International Conference on Advanced Video and Signal Based Surveillance (AVSS), 2021

People detection in top-view, fish-eye images is challenging as people in fish-eye images often a... more People detection in top-view, fish-eye images is challenging as people in fish-eye images often appear in arbitrary directions and are distorted differently. Due to this unique radial geometry, axis-aligned people detectors often work poorly on fish-eye frames. Recent works account for this variability by modifying existing anchorbased detectors or relying on complex pre/post-processing. Anchor-based methods spread a set of pre-defined bounding boxes on the input image, most of which are invalid. In addition to being inefficient, this approach could lead to a significant imbalance between the positive and negative anchor boxes. In this work, we propose ARPD, a singlestage anchor-free fully convolutional network to detect arbitrarily rotated people in fish-eye images. Our network uses keypoint estimation to find the center point of each object and regress the object's other properties directly. To capture the various orientation of people in fish-eye cameras, in addition to the center and size, ARPD also predicts the angle of each bounding box. We also propose a periodic loss function that accounts for angle periodicity and relieves the difficulty of learning small-angle oscillations. Experimental results show that our method competes favorably with state-of-the-art algorithms while running significantly faster.

Journal of Military Science and Technology, 2021

Currently, the high penetration of photovoltaic energy (PV) in the power system raises many chall... more Currently, the high penetration of photovoltaic energy (PV) in the power system raises many challenges due to the instability of this type of energy. To overcome this problem, this study analyzes the Power Factor Correction (PFC) control technique through the existing power grid to support converters integrated with the MPPT algorithm. Then, an experimental circuit model integrating two control methods will be fabricated and evaluated under the actual operating conditions. The experimental process shows that in the case of PFC support, output voltage response is more stable than the case that only uses the simple MPPT algorithm.

Chemistry & Biodiversity, 2021

A new racemic xanthone, garmckeanin A (1), and eight known analogs 2–9 were isolated from the eth... more A new racemic xanthone, garmckeanin A (1), and eight known analogs 2–9 were isolated from the ethyl acetate (AcOEt) extract of the Vietnamese Garcinia mckeaniana leaves. Their structures were determined by MS and NMR spectral analyses and compared with the literature. The AcOEt extract showed good cytotoxicity against cancer cell lines KB, Lu, Hep‐G2 and MCF7, with IC50 values of 5.40–8.76 μg/mL, and it also possessed α‐glucosidase inhibitory activity, with an IC50 value of 9.17 μg/mL. Garmckeanin A (1) exhibited inhibition of all cancer cell lines, with an IC50 value of 7.3–0.9 μM. Allanxanthone C (5) successfully controlled KB growth, with an IC50 value of 0.54 μM, higher than that of the positive control, ellipticine (IC50 1.22 μM). Norathyriol (8) was a promising α‐glucosidase inhibitor, with an IC50 value of 0.07 μM, much higher than that of the positive control, acarbose (IC50 161.0 μM). The interactions of the potential α‐glucosidase inhibitors with the C‐ and N‐terminal doma...

Science & Technology Development Journal - Engineering and Technology, 2020

Currently, there have been no publications of using unmanned aerial vehicles (drones) in mine man... more Currently, there have been no publications of using unmanned aerial vehicles (drones) in mine management and supervision in Vietnam. Meanwhile, drones have been used in many fields worldwide, especially in exploitation management. Therefore, the purpose of this paper is to present the feasibility of applying unmanned aerial vehicles to the management of open-cast mines. The data of this research was collected from Ta Zon 2 quarry using Phantom 4 at two moments (October 2018 and February 2019). Through the methods of calibrating and processing images on specialized software, the authors obtained point cloud data sets and digital elevation models (DEM) of the mining area two times. In which, the point cloud is the key product of the research, this large and detailed data set helps to fully and accurately reproduce and process the DEM and 3D models of the mine area. Next, the authors compared and adjusted DEM of the mine area, resulting in fluctuations of the geological block in Ta Zon...

Journal of Economics Development, 2014

7th International Symposium on Quality Electronic Design (ISQED'06)

We propose an accurate architecture-level power estima- tion method for SRAM memories. This hybri... more We propose an accurate architecture-level power estima- tion method for SRAM memories. This hybrid method is composed of an analytical part for dynamic power estima- tion and a circuit-simulation backend used to obtain static leakage power values of all basic memory components. The method is flexible in that memory size is an arbitrary param- eter. In a comparison to circuit-level

Proceedings of the Sixth International Conference on Engineering Computational Technology

In this paper, the smoothed finite element method (SFEM) is proposed for 2D elastic problems by i... more In this paper, the smoothed finite element method (SFEM) is proposed for 2D elastic problems by incorporation of the cell-wise strain smoothing operation into the conventional finite elements. When a constant smoothing function is chosen, area integration becomes line integration along cell boundaries and no derivative of shape functions is needed in computing the field gradients. Both static and dynamic numerical examples are analyzed in the paper. Compared with the conventional FEM, the SFEM achieves more accurate results and generally higher convergence rate in energy without increasing computational cost. In addition, as no mapping or coordinate transformation is performed in the SFEM, the element is allowed to be of arbitrary shape. Hence the well-known issue of the shape distortion of isoparametric elements can be resolved. Index Terms-finite element method (FEM), Gauss quadrature, isoparametric element, smoothed finite element method (SFEM), strain smoothing.

Desalination and Water Treatment, 2014

This study evaluated nutrients removal from domestic wastewater by five plants in wetland roof sy... more This study evaluated nutrients removal from domestic wastewater by five plants in wetland roof systems (WR). The study plants include Arachis duranensis (1), Evolvulus alsinoides (2), Cosmos Bipinnuatus (3), Cyperus alternifolius Linn (4), and Philodendron hastatum (5). The WRs were acclimatized at hydraulic loading rates (HLR) of 220 m 3 /ha d and operated at HLR of 300 m 3 /ha d. The plants (1), (2), (4), and (5) had the ability to grow under the rooftop conditions with domestic wastewater as a nutrient source while the plant (3) was not suitable and dead after 20 d of operation. Generally, A. duranensis (1) and C. alternifolius Linn (4) were the most suitable plants treating domestic wastewater under the conditions of WR. The average phosphorus removal efficiencies of (1) and (4) were approximately 75 and 89%, respectively, while the average nitrogen removal efficiencies were 69 and 92%. The phosphorus accumulation in plants (1) and (4) during operation was 20.4 and 29.4%, respectively, while the nitrogen accumulation was 21.5 and 93%. It is concluded that C. alternifolius Linn (4) has best nutrient removal among the study plants under the conditions of shallow bed WR treating domestic wastewater (24 ± 4 and 2.0 ± 0.4 kg TP/ha d).