Conference Proceedings - 2021

Permanent URI for this collection

http://repository.vlu.edu.vn:443/handle/123456789/1422

Browse

Browsing Conference Proceedings - 2021 by Title

  • Publication
    A fluid dynamics analysis and simulation of the airflow-generated kinetic energy in SRP Tunnel, Cebu, Philippines
    ( 2021)
    Mr. Mark Borres
    ;
    Engr. Alessandro D. Armodia
    ;
    Engr. Jun-Jie Vosotros
    ;
    Engr. Christian Rei Alforque
    ;
    Jennifer Baylon Verances
    The study of potential abundant natural resources as an energy source has become a trend in the past years. Wind energy is seen as an abundant natural resource which can be produced and generated. Roadways are great sources of wind energy since vehicles moving at certain speeds cause wind movements. The airflow inside SRP Tunnel, located at Cebu City, Philippines, underneath Plaza Independencia, is the focus of this paper. The structural layout and dimensions of the tunnel and the velocities of the vehicles passing through the tunnel were gathered and were used for the CFD simulation. Relevant data includes the traffic count inside the tunnel. Results show the quantity and location of the maximum airflow produced by moving vehicles at certain speeds inside the tunnel. The areas of the moving vehicle inside the tunnel significantly affect the amount of kinetic energy generated. The locations where the maximum airflow velocities occur are at segment b’ and a’ at ZX plane. Since b’ is located on the roadway of the tunnel, it is recommended to utilize segment a’. Segment a’ covers 1.85 meters from the wall of the tunnel to the side of the roadway. At YZ plane, as aforementioned, the maximum airflow velocities occur at segment e, f, and g. Segment e covers 2.7 meters, segment f covers 2.8 meters, and segment g covers 1.46 meters from the ground of the tunnel. This means that if a wind energy harvester will be installed along segment a’, the recommended height of the harvester should be at the range of 1.46-2.7 meters
  • Publication
    A numerical simulation of a wall-attached solar chimney with asymmetric heating
    ( 2021)
    Y. Q. Nguyen
    Solar chimney has been widely employed for natural cooling or heating of buildings. Of its forms, wall-attached solar chimney is common. Most of previous studies examined solar chimneys with the heat source on one side of the air channel of a solar chimney. In practical applications, depending on the materials, the absorption of solar radiation can be on both sides of the air channel. Therefore, this study examines a wall-attached solar chimney with the heat source distributed on both sides of the air channel. The Computational Fluid Dynamics (CFD) model was utilized to simulate the flow dynamics and heat transfer of the problem. Performance of the solar chimney was described in terms of the heat transfer coefficient, or Nusselt number, the induced flow rate, and the temperature rise through the chimney. The results shows that the examined parameters can be improved, reduced, or unchanged depending on the gap of the air channel and the heat distribution ratio. The findings may be useful for designing wall-attached solar chimney as they show the conditions for maximizing the flow rate or the temperature rise
  • Publication
    A Study of Facebook-Based Peer Comments on L2 Writing
    ( 2021)
    Vu Phi Ho Pham
    ;
    Anh Nguyen Thi Hoai
    Over the last decade, various studies have contributed to research around Computer-mediated Communication (CMC) tools such as Facebook Group as an alternative method for teaching English writing. In the review of Facebook in the L2 writing process, the study has found that the advent of Facebook integrated into a conventional writing class further necessitates the need for scrutinizing how to shape the quality of comments posted on Facebook Group and how to make use of these given comments in writing. This study explores Facebook-based peer comments on EFL students’ writing revisions, which may aid in answering how Facebook-based peer comments help learners improve their writing. This study’s contribution is to address writing teachers that play an essential role in applying technology into their writing classes to help students with peer commenting activities and students who actively take advantage of Facebook Group in learning outside classrooms.
  • Publication
    A study on the species composition of Toxocara spp. in infected home cats in Ho Chi Minh City
    ( 2021)
    Thi-Phuong Nguyen
    ;
    Huu-Hung Nguyen
    Toxocariasis is defined as a zoonotic disease caused by species of Toxocara genus, including Toxocara canis and Toxocara cati, which are potentially infectious to human. Toxocara malaysiensis, a roundworm in cat with similar morphology as Toxocara cati, was initially identified in Malaysia and as a common ascaridoid of cats in Hanoi, Vietnam. This study was conducted to investigate the species composition of Toxocara spp. in infected home cats in Ho Chi Minh City by morphological, and moculecular biology method, reconstruct the phylogenetic tree based on atp6 gene using MEGA 6.0 sofware. Toxocara spp. were identified including 4 individuals of T. cati species and 1 individual of T. malaysiensis species. Genetic distance between T. malaysiensis in this study and one from China was 0%. This study indicated the detection of Toxocara malaysiensis for the first time in Ho Chi Minh City.
  • Publication
    Activities to preserve and promote traditional and cultural heritage of Dao Thanh Y people in Quang Ninh
    ( 2021)
    Ninh Ngo Hai
    ;
    Dinh Luong Khac
    ;
    Hung Ngo Minh
    ;
    Lam Nguyen Dinh
    ;
    Son Quang Van
    As one of the three triangles of socio-economic development in the Northern delta and midlands, Quang Ninh is often referred to as an ecological, economic and cultural region. However, a large part of the province is also located in the Northeast region with clear mountainous areas. In recent years, Quang Ninh province has paid special attention to the conservation, promotion and exploitation of cultural heritage of the communities of ethnic minorities living in mountainous and highland communes to preserve real estate, improving population life and developing tourism economy. The article covers the typical cultural characteristics of the Dao Thanh Y people in Quang Ninh, studies the current situation of conservation and promotion of cultural heritage of the Dao Thanh Y community and suggests some solutions to improve effectiveness. Results of this activity, based on experience, a number of models have been successfully applied in other localities in Vietnam
  • Publication
    Air quality and climate co-benefits estimation for vehicle fuel switching in Ho Chi Minh City
    ( 2021)
    Trang Tran Thu
    ;
    Minh Phan Nguyen Nguyet
    Transportation is identified as one of the major sources causing air pollution in Ho Chi Minh City (HCMC). International Vehicle Emission Model was used to conduct emission inventory of taxis and motorcycles in HCMC in 2014 and project the total emission in 2020. CO2 equivalent of nine air pollutants including climate forcers was generated from the model. To estimate emissions from different vehicle types, Global Positioning System (GPS) and technical activities surveys were carried. Emission factors (EFs) of taxi and motorbike, as well as the reduction of CO2 equivalent of fuel switching scenarios, were figured out. Results showed that the annual emission of taxis and motorcycles of HCMC in 2020 for CO, NOx, SO2, CO2, N2O, CH4 were 0.539; 1.417; 0.047; 1.597; 0.064; 0.109; 0.014; 0.046 and 4.213; 1.329; 0.124; 0.696; 0.510; 2.035; 1.653; 5.370 Mt/year, respectively. The potentiality of air quality and climate co-benefits was determined by using Global Warming Potential (GWP) and EFs of emission species. Fuel switching would bring noticeable benefits, in CO2 equivalent. If 50% of taxis and motorcycles in HCMC switched from traditional fuels to compressed natural gas (CNG) (Scenario 1) and liquefied petroleum gas (LPG) (Scenario 2), the total emission of nine selected pollutants for both taxi and MC fleets would reduce in Scenario 1 more than Scenario 2. Switching to CNG would also bring more climate benefits than those of switching to LPG as it reduced 16% and 57% of climate forcers in CO2 eq. Between taxi and motorcycle fleet, emission from motorcycles was higher than those from taxis.
  • Publication
    An efficient curriculum management ICT-based system to support AUN-QA
    ( 2021)
    Dinh Van Ho
    ;
    Thi Hong Phan
    ;
    Ngoc Duy Pham
    Effective curriculum management has been the main concern at Van Lang University over the past few years. With the goal of becoming one of the most admired young universities in Asia by 2030, Van Lang University has strived to enhance its academic quality by a constant process of inspection and self-evaluation in which curriculum management plays a central role. Aiming to suggest a proper way to manage curricula, in this article, the authors present an ICT based solution to digitize curriculum and syllabus content with keen attention to details of expected learning outcomes based on AUN-QA, a standard measurement which was proposed by ASEAN University Network for assessing academic quality at university. The proposed system has been experimentally applied to manage syllabuses of all subjects in one semester at Information Technology faculty. Faculty retrospective has shown that the tool is efficient in managing and visualizing the curriculum and syllabus content, which is useful in promoting, evaluating, as well as comparing the amount of training and learning outcomes among curricula. Based on this research, the researchers hope that Van Lang University, especially the Office of Academic Affairs will be able to manage all current curricula effectively and consistently.
  • Publication
    An empirical Study of Factors Influencing the Language Proficiency of Vietnamese Students
    ( 2021)
    Lan Thi Ngoc Nguyen
    ;
    Nga Thi Thanh Tran
    ;
    Huyen Thi Nguyen
    ;
    Minh Quang Le
    This study aims to investigate language proficiency and its determinants of Vietnamese students. Based on holistic literature, the authors examine and test the impact of five intrinsic factors related to the students’ characteristics (which are learning purpose, learning ability, learning method, hard-working, and self-awareness) and three extrinsic factors that are related to demographic factors, parental indicators, and schooling-environment on the language proficiency. Data was collected from online questionnaires sent to more than 2500 students from eight famous universities in Vietnam and converted into an excel version before translated into SPSS and EVIEW. Research results show that intrinsic factors, especially learning methods, play a vital role in shaping Vietnamese students’ capability to learn a second language. From educators’ perspectives, the higher level of English exposure the students are equipped at school, the higher their language proficiency. Finally, we compare the difference in learning language ability among genders and ages. The findings suggest that girls and minorities are less proficient in language than others.
  • Publication
    An experimental study on effects of indoor plants on temperature and humidity in a test house
    ( 2021)
    Y. Q. Nguyen
    ;
    Duy C. Bui
    ;
    Lan N. Pham
    The use of vertical greenery systems in buildings is becoming more and more common as they provide several benefits, particularly in improving indoor thermal comfort. This paper studies the influence of an indoor living wall on the air temperature and humidity in the test house in Ho Chi Minh City. Effects of the plants, irrigation and ventilation were examined. The temperature and humidity were monitored and analyzed during a 2–month period. The cooling effect of the living wall was proven, with an average reduction of 1°C of the room temperature. Higher air humidity levels were experienced near the green wall, increasing the overall humidity in the room. Irrigation for the plants also helped reduce the room temperature compared to that without irrigation. Therefore, these systems have been proven to be very useful and interesting for warm indoor environments due to the cooling effect.
  • Publication
    An internet of things (IoT) based swarm electrification for solar powered households
    ( 2021)
    Wilen Melsedec O. Narvios
    ;
    Joecyn N. Archival
    ;
    Y. Q. Nguyen
    Certain areas suffer frequent energy shortages due to their limited access to the power grid. With this notion, it is very recommended that these areas utilize alternative forms of producing electric energy. The Solar Home System (SHS) has helped millions of families gain access to electricity in Asia and requires the simplest form of a panel and battery. This setup provides a household with sufficient power for their basic needs, particularly the electrification of essential lightings and appliances. The Swarm Solar Household System (SSHS) is one of the potential ways of enjoying energy for every household for in this process, the households that need more power can connect to the interconnected households and use their energy. This research establishes a proof-of-concept for the idea of swarm solar household systems (SSHS) as an additional but beneficial feature for existing solar home systems (SHS). The IoT-based information and control system will be used to utilize SSHS powerfully. SSHS has been installed readily by each of these modeled households. Every household includes a swarm solar household system wireless connection. Monitoring the mutual power and cost process associated with this SSHS can determine the owner’s total payment. In this study, an IoT-based swarm solar household system was successfully obtained using sensors, controllers, Wi-Fi modules, and software applications via Blynk with a built-in cloud server for monitoring and controlling the connection between households; energy sharing is enabled
  • Publication
    Analysis of pathogenic characteristics induced by Toxocara cati in experimental mouse model
    ( 2021)
    Thi-Tuyet-Trinh Thai
    ;
    Huu-Hung Nguyen
    Toxocara cati is a kind of round worm which parasitize in Felidea. Their larvae can infect human and induce toxocariasis. In human body, the larvae uncontrollably migrate and induce multi-organ damages. However, characteristics of toxocariasis in human are not fully understood. In this study, mice were used as a model of toxocariasis produced by intraperitoneal infection of T. cati larvae. The pathogenic characteristics were assessed by histopathology and the recovery of these worms from the animal organs after infection. Our results showed that the larvae induced remarkable damages in the liver and lungs and a countable number of larvae was found in the brain after 4 weeks of infection. The data indicates a high risk that the worms can make in human and requires further investigations.
  • Publication
    Analyzing the factors affecting to the intension to use traditional medicine
    ( 2021)
    T. L. Do
    ;
    T. Pham
    The research is conducted with the goal of finding out the factors that affect the intention to use the traditional medicine over the modern one.
  • Publication
    Analyzing the usage of short cantilever reinforced concrete beam and applying strut and tie model in design calculation
    ( 2021)
    Nam H. Vu
    ;
    Trung T. Tran
    ;
    Xuan D. Tu
    Short cantilever beams appear in both civil and industrial projects such as bearing supports in assembled structures, connections between steel and concrete or heavy load-bearing components such as crane pillars, supporting bridge, etc. However, the distributed stress in the short cantilever reinforced concrete beam under concentrated load usually has a discontinuity zone and varies, which depend on the ratio between span length and height, making it difficult to calculate from the viewpoint as conventional beam. The strut and tie model has been studied by many authors, the application results have been recorded and included in the Euro code and ACI standards but the application to designers in civil engineering field is not efficient. Whenever designers need to design short cantilever beams, a difficult research must be done by designers, and it takes period to finish calculations. In this article, we discuss the usage of short cantilever reinforced concrete beams, apply strut and tie model to calculate this structure in accordance with ACI and Euro code standards and compare the calculation results to short cantilever reinforced concrete beams of TCVN 5574-2018 for an overview of these structural calculations in 3 different criteria. The article will be a practical reference source for designers and students to apply in real building design and reduce time in designing short cantilever beam
  • Publication
    Application of two-dimensional model to simulate the storm surge in Ho Chi Minh city’s coastal area
    ( 2021)
    Nga N. Q. Tra
    ;
    Loan K. Nguyen
    ;
    Y Q. Nguyen
    The paper focuses on the flow in the coastal area of Ho Chi Minh City in stormy conditions. In this study, using hydraulic model MIKE 21 with wind and pressure conditions in Tropical Storm Pakhar (2012). The model is calibrated and verified by actual water level data measured at Nha Be, Vam Co, Vam Sat, Dong Tranh, Nga Bay and Cai Mep stations, showing good correlation, ensuring tissue reliability. The simulation results show that, when there is a storm, the average water level rise is about 10 cm in estuary areas, while at rivers, the water level rises by 5 cm. The results show the influence of the storm on the study area, which if combined with rain could cause flooding
  • Publication
    Art and architecture: A historical assessment of Nam Bo houses, late 19th to early 20th centuries
    ( 2021)
    Thanh Luong Van
    ;
    Hung Ngo Minh
    ;
    Phuc Hoang Minh
    ;
    Son Quang Van
    The architectural style and decorative art of traditional Nam Bo houses has been an attractive area of study for decorative arts specialists and artisans in Vietnam. In general, some styles and decorative features are quite similar to the Ruong houses of Hue, especially in the interior layout - reflects different beliefs about the organization of space. From an artistic point of view, the article explores in-depth the artistic features of decorating typical classical houses in the South. The houses affected by the latest mixed style between French colony and the Nguyễn Dynasty. The diverse artistic value wrung creates unique culture of the ancient Southern region
  • Publication
    Assessing Supplier-Customer Relationship Management Practice and Business Performance
    ( 2021)
    Chijioke Nwachukwu
    ;
    Vu Hieu
    The To remain competitive firms must develop and implement strategies to attract and retain key suppliers and customers. Drawing on transaction cost economics (TCE) and social exchange theory (SET), this study shed light on the link between supplier relationship management (SRM) practices, customer relationship management (CRM) practices and business performance. The paper uses surveys conducted on microfinance banks operating in Nigeria. This study used correlation and regression to analyse the direct influence of SRM practices and CRM practices on business performance. Data from 307 respondents affirm that supplier relationship management practices and customer relationship management practices increase business performance. Furthermore, supplier relationship management practices and customer relationship management are significantly correlated with financial health, market and sales performance and operational performance. We conclude that implementing strong collaboration with suppliers and customers can foster superior business performance
  • Publication
    Automatic power factor correction for three-phase induction motors with embedded IoT-Based monitoring system
    ( 2021)
    Wilen Melsedec O. Narvios
    ;
    Y. Q. Nguyen
    Power efficiency and responsible electricity usage are the topmost global concern nowadays, as significant electricity resources are mostly non-renewable. In industries, power factor correction dramatically reduces system power losses, increases the load carrying capabilities, maintains an efficient electrical system, and more. Power factor (PF) measures an electrical system’s power efficiency and is an essential aspect in improving the quality of supply. In terms of induction motors, the power factor drastically changes as the motor changes load; therefore, automatic power factor correction deals the most significant part in maintaining the efficiency of the power supplied to the machine. The study aims to build an Automatic Power Factor Correction (APFC) Unit with embedded Internet of Things (IoT)-Based energy consumption monitoring system that will automatically improve the system’s power factor. An open-source energy monitoring library was implemented to design accurate power calculations to display the system’s voltage, current, power, power factor, energy consumption, and frequency. Through a wireless sensor network, the real-time data reading from the IoT-Based energy monitoring system can be accessed and obtained from the IoT-Based web server through the Blynk IoT platform. Energy measurement and monitoring are done in the sensor microcontroller unit (MCU). The data is then calculated and transmitted to the capacitor bank MCU that handles the switching of relays to the capacitor bank to compensate for the system’s lagging power factor. The result shows that APFC provides the ease of monitoring more efficiently and can be achieved due to reduced power losses and reduced electric consumption
  • Publication
    Blockchain for building information modeling in construction industry
    ( 2021)
    Hung Tien Le
    Building Information Modeling (BIM) can be considered as a visual database which means a 3D building model equips all data for different disciplines like architecture, structure and Mechanical-Electrical – Plumbing (MEP) design. The data rich model serves multi tasks from cost estimation, project scheduling, energy analyses. However, the data in BIM model cannot be controlled strictly in project phases by stakeholders, therefore the quality of BIM Model and included documents is limited and disorder. Blockchain, the back-end database technology that makes Bitcoin work, is one of the most exciting technologies emerging right now. Beyond the cryptocurrency, it is redefining how we store, update, and move data on networks. It enables a whole new way of writing and deploying applications that has the potential to improve online security and trust. It can even enable the creation of a new type of organization that is devoid of hierarchy and centralized decision-making. This paper shows the development of a blockchain based on Ethereum for BIM applications, which can help to solve model ownership and increase the quality and usefulness of the BIM model