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  • 1
    Online Resource
    Online Resource
    Ho Chi Minh City University of Technology and Education ; 2021
    In:  Journal of Technical Education Science , No. 65 ( 2021-08-30), p. 54-59
    In: Journal of Technical Education Science, Ho Chi Minh City University of Technology and Education, , No. 65 ( 2021-08-30), p. 54-59
    Abstract: Trong bài báo này, tác giả trình bày các kết quả nghiên cứu ứng dụng bộ điều khiển nơ ron mờ thích nghi (ANFIS) để giảm dao động nhằm nâng cao đáp ứng của hệ thống điện mặt trời áp mái công suất nhỏ khi có các sự cố xảy ra trong quá trình hoạt động. Ngoài bộ điều khiển nhiễu loạn và quan sát (P & O) được sử dụng để dò điểm làm việc cực đại (MPPT) cho hệ thống điện mặt trời áp mái 5,8-kWp sử dụng các tấm pin quang điện (PV), bộ điều khiển ANFIS được đề xuất dùng điều khiển ổn định điện áp DC trong bộ biến tần của hệ thống điện mặt trời. Một số kết quả mô phỏng miền thời gian của hệ thống đề xuất được thực hiện với các điều kiện hoạt động khác nhau như bức xạ mặt trời thay đổi, sự cố ngắn mạch xảy ra ở đầu ra biến tần và sự cố sụt giảm điện áp từ lưới điện được thực hiện bằng cách sử dụng công cụ Simulink của Matlab. Dựa trên các kết quả mô phỏng này, có thể kết luận rằng bộ điều khiển ANFIS được thiết kế cho thấy hiệu quả tốt hơn trong việc giảm độ vọt lố và thời gian quá độ các đáp ứng của hệ thống điện mặt trời áp mái khi các điều kiện vận hành thay đổi.
    Type of Medium: Online Resource
    ISSN: 2615-9740
    Language: Unknown
    Publisher: Ho Chi Minh City University of Technology and Education
    Publication Date: 2021
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  • 2
    Online Resource
    Online Resource
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2020
    In:  VIETNAM JOURNAL OF EARTH SCIENCES Vol. 43, No. 1 ( 2020-12-04), p. 33-55
    In: VIETNAM JOURNAL OF EARTH SCIENCES, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 43, No. 1 ( 2020-12-04), p. 33-55
    Abstract: In this paper, we present detail data of Pliocene - present tectonics and strain rate from GPS measurement and seismic interpretation. Using international reference frame ITRF08, we revealed absolute tectonic velocities of GPS sites with the slip rate to the east between 22 to 25 mm/year, to the south between 4 to 8 mm/year. The present strain rate was determined from present tectonic velocities that were consistent with the recent strain rates determined from seismic profiles, thickness of Pliocene - Quaternary sediments. Present day strain rate varying from 10 to 30 nano per year indicated that the region has been deformed weakly, in a stable tectonic regime.
    Type of Medium: Online Resource
    ISSN: 0866-7187 , 0866-7187
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2020
    detail.hit.zdb_id: 1123550-0
    SSG: 6,25
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  • 3
    Online Resource
    Online Resource
    Vietnam National University Journal of Science ; 2023
    In:  VNU Journal of Science: Natural Sciences and Technology ( 2023-04-14)
    In: VNU Journal of Science: Natural Sciences and Technology, Vietnam National University Journal of Science, ( 2023-04-14)
    Abstract: The peels of grapefruit are a rich source of Pectin and Cellulose. This study focuses on the extraction of Pectin and Cellulose from grapefruit peels, and the production of carboxymethyl Cellulose (CMC) from extracted products. Firstly, the extraction conditions of Pectin from grapefruit peels were optimized to obtain a high yield of Pectins such as extraction time and citric acid concentration. The weight, purity, and esterification degree of Pectin were also determined. The highest yield of Pectin is 32.12% in the extraction conditions with pH 1.25 for 60 minutes at 80 oC. The Pectin product is of 84.02% purity at 29,427 g/mol of weight with 86.40% esterification degree. For extraction of Cellulose from grapefruit peels, the highest yield of Cellulose is 45.08% in the conditions with a pH of nitric acid 0.75 for 70 minutes at 90 oC. After that, the extracted Cellulose was converted to Carboxymethyl Cellulose by Monochloroacetic acid etherification. The characterization of Pectin, Cellulose, and CMC is determined through Scanning Electron Microscopy (SEM) and Infrared spectrums. The experimental results also showed that Pectin and Cellulose were successfully extracted from grapefruit peels and Carboxymethyl Cellulose was successfully produced from the extracted Cellulose.
    Type of Medium: Online Resource
    ISSN: 2588-1140 , 2615-9317
    Language: Unknown
    Publisher: Vietnam National University Journal of Science
    Publication Date: 2023
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  • 4
    In: Healthcare, MDPI AG, Vol. 9, No. 6 ( 2021-06-11), p. 718-
    Abstract: Adopting a cross-sectional study design, we aimed to examine the prevalence of psychological problems in different healthcare workers during the COVID-19 pandemic in the hospitals in these COVID-19 hotspots (Da Nang city and Quang Nam province) and to explore the socioeconomic and COVID-19 control-related factors that are associated with various psychological problems. A total of 611 healthcare workers were included in the final analysis from 1 August 2020 to 31 August 2020. The prevalence of anxiety, depression, insomnia, and overall psychological problems was 26.84%, 34.70%, 34.53%, and 46.48%, respectively. The prevalence rates of anxiety were approximately equal amongst the groups of healthcare workers, and moderate-to-severe anxiety was the most common in physicians (11.11%). The prevalence of depression was the highest in nurses (38.65%) and moderate-to-severe depression was mainly found in physicians (11.81%). The prevalence rates of insomnia were 34.03% in physicians, 36.20% in nurses, and 31.21% in technicians; in particular, the rate of moderate-to-severe insomnia was higher in physicians and nurses compared to technicians. The prevalence of overall moderate-to-severe psychological problems was the highest among physicians (14.58%), followed by nurses (12.58%) and technicians (9.22%). Statistically significant associated factors of current psychological problems were the occupations of physicians or nurses, less than 1 year of experience, university education, living with 4–5 people, reporting 1000–5000 m distance between home and workplace, participating in the COVID-19 control for less than 1 week, being under social isolation at home, being affected a lot by the community, reporting inadequate equipment in current workplace conditions, frequently working in the department directly in contact with the COVID-19 patients, and feeling anxious, stressed, or sad about current works. Present findings can provide valuable evidence for the policymakers and managers to adopt supportive, encouraging, motivational, protective, training, and educational interventions into healthcare workforce in other parts of Vietnam.
    Type of Medium: Online Resource
    ISSN: 2227-9032
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2721009-1
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  • 5
    In: Journal of Fuzzy Systems and Control, Peneliti Teknologi Teknik Indonesia, Vol. 1, No. 3 ( 2023-12-26), p. 80-84
    Abstract: The present study examined the nonlinear system of Ball and Beam, to design an intelligent controller for this dynamic system. The authors formulated a mathematical model for the system and performed simulation testing using MATLAB to control it. It is noteworthy that the mathematical model was exclusively used for simulation purposes and not for building the controller. The author's team then proceeded to develop a Fuzzy Controller for the simulation model of the Ball and Beam system. Subsequently, the team tested the Fuzzy controller on the actual Ball and Beam model. The primary objective of this study was to assess the feasibility of building and controlling an intelligent controller for a nonlinear object, without relying on its mathematical model. The findings of the study can be useful in designing and controlling complex systems that are difficult to model mathematically.
    Type of Medium: Online Resource
    ISSN: 2986-6537
    Language: Unknown
    Publisher: Peneliti Teknologi Teknik Indonesia
    Publication Date: 2023
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  • 6
    Online Resource
    Online Resource
    Vietnamese Society for Infectious Diseases ; 2020
    In:  Tạp chí Truyền nhiễm Việt Nam Vol. 2, No. 30 ( 2020-06-16), p. 100-107
    In: Tạp chí Truyền nhiễm Việt Nam, Vietnamese Society for Infectious Diseases, Vol. 2, No. 30 ( 2020-06-16), p. 100-107
    Abstract: Mục tiêu: Nhằm mô tả tỉ lệ trầm cảm và xác định một số yếu tố liên quan đến trầm cảm ở người bệnh nhiễm HIV đang được điều trị thuốc kháng vi rút ARV tại Trung tâm Bệnh nhiệt Đới, Bệnh viện Bạch Mai năm 2019. Đối tượng và phương pháp nghiên cứu: Thiết kế nghiên cứu mô tả cắt ngang được tiến hành bằng phỏng vấn trực tiếp người bệnh tại địa điểm nghiên cứu. Kết quả: 120 người bệnh tham gia vào nghiên cứu với tỉ lệ nam giới chiếm 55,8%. Tỉ lệ trầm cảm đánh giá theo thang đo PHQ - 9 là 11,7%, trong đó, tỉ lệ trầm cảm nhẹ là 7,5%, trung bình là 3,3% và nặng là 0,8%. Phân tích hồi quy logistic đa biến cho thấy các đối tượng có tiền sử tiêm chích ma túy và có hỗ trợ xã hội thấp hoặc trung bình có xu hướng mắc trầm cảm cao hơn so với nhóm chưa từng sử dụng ma túy và có hỗ trợ xã hội cao. Các yếu tố nhân khẩu về giới tính, tuổi và đặc điểm nghiện thuốc lá, rượu, bia không cho thấy sự liên quan có ý nghĩa thống kê đến tình trạng trầm cảm ở đối tượng nghiên cứu. Kết luận: Kết quả nghiên cứu gợi ý tư vấn và lồng ghép điều trị các rối loạn tâm thần bao gồm trầm cảm là cần thiết nhằm nâng cao chất lượng điều trị và chất lượng cuộc sống cho người nhiễm HIV.
    Type of Medium: Online Resource
    ISSN: 0866-7829
    URL: Issue
    Language: Unknown
    Publisher: Vietnamese Society for Infectious Diseases
    Publication Date: 2020
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  • 7
    In: Journal of Medicine and Pharmacy, Hue University of Medicine and Pharmacy
    Abstract: Background: Since the academic year 2018-2019, Hue University of Medicine and Pharmacy has implemented a renewed competency-based medical program, with comprehensive changes in clinical assessment methods such as Mini-CEX, EPAs, OSCE… The evaluating students’ satisfaction with these methods onwards is a critical issue in enhancing the quality of medical education. This study focuses on describing and analyzing the factors influencing the satisfaction of 4th to 6th-year medical students with the new clinical assessment methods, aiming to provide a foundation for adjusting and improving these methods to better meet the needs and preferences of the students. Objectives: Surveying the satisfaction of medical students and factors related to their satisfaction with innovative clinical assessment methods at Hue University of Medicine and Pharmacy. Materials and Method: The study involved 464 medical students in years 4-6 enrolled in the competency-based integrated renewal program. A web-based survey method was utilized to assess the level of satisfaction of medical students with the training program. Linear regression analysis was employed to evaluate the correlation between various components of the training quality and student satisfaction. Results: The overall satisfaction level of students with the training program was as follows: Satisfied: 91.6%; Dissatisfied: 8.4%. The study revealed that three factors significantly contributed to student satisfaction with the innovative clinical assessment methods: Appropriateness, Organizational arrangement, and Quality of assessment. Conclusion: The majority of students (91.6%) were satisfied with the appropriateness of the innovative clinical assessment methods. The influence of factors on student satisfaction with the innovative clinical assessment methods were ranked as follows: Appropriateness, Organizational arrangement, and Quality of assessment. Key words: satisfaction, medical students, innovative clinical assessment methods.
    Type of Medium: Online Resource
    ISSN: 1859-3836
    Language: Vietnamese
    Publisher: Hue University of Medicine and Pharmacy
    Publication Date: 2024
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  • 8
    Online Resource
    Online Resource
    Hanoi University of Civil Engineering (HUCE) ; 2018
    In:  Journal of Science and Technology in Civil Engineering (STCE) - NUCE Vol. 12, No. 1 ( 2018-02-14), p. 46-52
    In: Journal of Science and Technology in Civil Engineering (STCE) - NUCE, Hanoi University of Civil Engineering (HUCE), Vol. 12, No. 1 ( 2018-02-14), p. 46-52
    Abstract: Mô hình thông tin công trình, tên tiếng anh là Building Information Modeling, viết tắt BIM, là một tiến trình tạo dựng và sử dụng mô hình kĩ thuật số giàu dữ liệu để cho phép các bên liên quan hợp tác thiết kế, thi công và vận hành công trình xây dựng. Trong tiến trình đó, BIM tích hợp các phần mềm giúp tự động hóa việc tính toán khối lượng cấu kiện và được cho là một công cụ đo bóc khối lượng công trình xây dựng hiệu quả. Bài báo nghiên cứu việc ứng dụng BIM trong đo bóc khối lượng (BIM-based quantity take-off, viết tắt là QTO), tìm hiểu kinh nghiệm của một số nước tiên phong về ứng dụng BIM vào đo bóc khối lượng trên thế giới và trong khu vực với mong muốn tìm ra bài học khi áp dụng tại Việt Nam. Nhận ngày 5/12/2017; sửa xong 21/12/2017; chấp nhận đăng 16/01/2018
    Type of Medium: Online Resource
    ISSN: 1859-2996 , 1859-2996
    Language: Unknown
    Publisher: Hanoi University of Civil Engineering (HUCE)
    Publication Date: 2018
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  • 9
    Online Resource
    Online Resource
    IOP Publishing ; 2021
    In:  IOP Conference Series: Materials Science and Engineering Vol. 1159, No. 1 ( 2021-06-01), p. 012068-
    In: IOP Conference Series: Materials Science and Engineering, IOP Publishing, Vol. 1159, No. 1 ( 2021-06-01), p. 012068-
    Abstract: In current practice, indirectly structured frequency converters are popular because of the simple switch and control circuit diagram, and pulse width modulation (PWM) can be used to control the semiconductor switches. The PWM method has the advantage of a simple control circuit but has large switching losses and generates a common-mode voltage that causes motor damage. The development of the space vector modulation (SVM) method takes advantage of the PWM method, reducing the switching loss of the switches and reducing the harmonic at the output of the inverter. With direct converters, there are many types depending on the circuit structure and semiconductor key structure, including matrix frequency converters which are widely studied. The classical modulation method according to the duty-cycle matrix approach for matrix converter has disadvantages such as complex computational algorithms, which require many trigonometric calculations. Based on the PWM and SVM modulation algorithms for indirect converters, a space vector modulation method for matrix converters will be developed. Compared with the indirect converter, the SVM modulation method for the matrix converter will be based on two separate modulation principles: control the input current vector and control the output voltage vector. The relationship between current and voltage at the converter input is closely related to the voltage and current at the output. The relationship between current and voltage at the converter input is closely related to the voltage and current at the output. Make sure at the input of the converter, the power factor cosφ = 1 and can be adjusted, it has the quality of sine input and outputs current and the exchange power in two directions.
    Type of Medium: Online Resource
    ISSN: 1757-8981 , 1757-899X
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2567001-3
    detail.hit.zdb_id: 2506501-4
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  • 10
    In: European Science Editing, Pensoft Publishers, Vol. 49 ( 2023-12-12)
    Abstract: Background: Digital transformation refers to applying digital technology in various fields of society. In the last 5 years, digital transformation has spread to most areas of social life, including education. However, research on digital transformation in education is still fragmented. Objectives: The aim of the study was to present a comprehensive review of studies on digital transformation in education using bibliometric analysis. Methods: We searched the Scopus database from inception to 1 January 2023 using the search terms & lsquo;digital transformation & rsquo; AND & lsquo;education & rsquo; within abstracts, keywords, or titles of journal articles or conference papers written in English. The retrieved articles were analysed using VOSviewer and Biblioshiny tools. Results: A total of 1329 relevant studies were retrieved. Although the first paper in this field was published in 1999, the number of publications has increased rapidly only in the past 4 years. The most influential countries in this field are the developed countries (Russian Federation, Germany, and the United States), but scholars from the developing countries (Indonesia and Thailand) are among the most productive. Papers on digital transformation are frequently published in journals with lower rankings within the Scopus database. Using VOSviewer for keyword co-occurrence analysis, we classified the research topics related to digital transformation in educa-tion into four main groups: digital transformation in higher education under the impact of the coronavirus disease pandemic 2019 pandemic, applying the technolo-gies of the Fourth Industrial Revolution to education, digitization and digital compe-tence in education in the context of digital transformation, and learning forms using technology (for example, e-learning, m-learning, and blended learning) in higher-education institutions. Conclusions: Four research trends related to digital transformation in education were identified. These trends may also change as digital transformation continues to develop.
    Type of Medium: Online Resource
    ISSN: 2518-3354 , 0258-3127
    Language: Unknown
    Publisher: Pensoft Publishers
    Publication Date: 2023
    detail.hit.zdb_id: 2211450-6
    detail.hit.zdb_id: 1087246-2
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