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Publication

The Use of Drama Role-Playing in Teaching English Literature for English Majored Students: An Action Research at Van Lang University

( 2021)

Hoa Mai Phuong Nguyen

Role-Playing has been applied to teach literature in many countries; however, research on this subject is minimal. This study aims to describe literary class activities, which is considered the first step of action research to solve the difficulties in teaching English literature in the Vietnamese context. The participants include 100 senior English majored students involved in the Pre, While and Post activities in the English Literature class. Post-session interviews were conducted to learn more about learners’ attitudes. These activities initially aroused students’ interest in understanding literary works and enhanced their ability to appreciate the selected stories in Van Lang University’s curriculum.

Publication

Indications of Paired- vs. Grouped-Peer Feedback on Students’ Writing Activities

( 2021)

Loi Nguyen Tan

;

Vu Phi Ho Pham

L2 teachers in Writing have long been using peer feedback to improve their writing skills in the classrooms. While findings from nearly all studies have shown paired-peer feedback and grouped-peer feedback to enhance student writing performance, few studies have attempted to compare the effect of paired and grouped-peer feedback on writing performance. If the results of paired and grouped-peer feedback are thus proposed, the view of using paired and grouped-peer feedback is further clarified in the EFL written guidance, so teachers can have a clearer understanding of the appropriate arrangement for students to receive paired or clustered peer reviews. This helps educators to organize their students in a writing classroom. First, in the current post, we shall address the theoretical basis of peer reviews. We will review previous feedback studies by analyzing paired-peer feedback and grouped-peer feedback behaviors in foreign and Vietnamese contexts. Finally, we will define the research differences based on theoretical review and previous studies.

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

Relationships of Marketing, Customer Satisfaction and Customer Loyalty – A Case Of Vietnamese Dairy Retail Stores in Ho Chi Minh City, Vietnam

( 2021)

Trung LAM

;

Bach LE

;

Tuan Hoang DINH

;

Hieu VU

With the current high market competition, all businesses must have a suitable approaches and strategies to develop more and more customers and achieve their customer satisfactionand loyalty. This work aspires to inspect the relationships of the marketing, customer satisfaction and customer loyalty in Vietnamese dairy retail stores in Ho Chi Minh City, Vietnam. The study employs to methods of qualitative and quantitative. The qualitative technique is gone with the related literature and theories, consultations with 6 academic researchers, 27 business owners, and 15 managers, group discussions and 3 in-depths planned interviews with 30 random customers. The quantitative tool is donewith 200 surveyed questionnaires with the customers in milk product retail stores in Ho Chi Minh city. The findings show 4 important factors affecting customer satisfaction: Product, Price, Promotion, Place (Distribution channel) and 2 crucial other factors: Satisfaction and reference group have linear relationships with customer loyalty. The findings are expected to add to the accessible literature to both theoretical and managerial approaches for a superior understanding of the activities of the marketing mix, customer satisfaction, and customer loyalty, particularly in the research trade setting

Publication

Using Collocations to Enhance Academic Writing: A Survey Study at Van Lang University

( 2021)

Duc Thanh Hung Duong

;

Nha Dai Trang Nguyen

As a formulaic language, collocations have brought benefits and challenges to EFL learners’ academic writing. These chunks’ functions in academic writing need examining for a long time. Under certain constraints of the research setting, the current study explored both students’ and lecturers’ standpoints on using collocations to enhance academic writing. As one of quite a few studies in the Vietnamese context, the research included 47 English-major juniors and 5 English lecturers at Van Lang University, Hochiminh City, in the first semester of 2020-2021 academic year. Two research instruments were employed: the online questionnaire (to students) and the email interview (to lecturers). Thematic analysis and descriptive statistics by SPSS (version 20) were utilized to describe both stakeholders’ insights into the research problem. Major findings illustrated that the students’ demotivation of extensive reading and collocational practice were additional barriers to the collocational acquisition. Learners’ and teachers’ perspectives on the benefits of collocations in academic writing are congruent; however, the ignorance of collocations in language instruction and ineffective learning strategies might cause many constraints. The study results might provoke questions of whether using corpus-based tools (instructed or non-instructed) could have any impact on students’ collocation use in their academic writing. Thus, the results might draw attention to the need of teachers’ and learners’ reflection and recommends a few ideas for future research.

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

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

Touchless Hotel A Potential Sustainable Model for The Hospitality Industry in The Post Pandemic Period The Case in Hotels in Vung Tau, Vietnam

( 2021)

Phạm Xuân Quyết

;

Trần Ngọc Anh Vũ

;

Cao Quốc Việt

The Covid-19 pandemic has severely affected the entire economy. In particular, the hotel service industry struggled with the decrease in revenue and affected the ability to develop according to the set goals. Realizing that the development of a touchless model for hotels still has a lot of potentials, the application of touchless hotels in the tourist city of Vung Tau is considered to analyze in the post-pandemic period. By reviewing papers and interviewing four managers in luxury hotels in Vung Tau, the study identifies the strengths, weaknesses, opportunities, and threats for applying touchless hotels in Vung Tau. The expert interviews also unveiled the difficulties in both human interaction and financial situations and hoped to orient safely and sustainably revitalizing tourism in Vietnam in general.

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

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

Generation rates of bottom and fly ash from thermal generation facilities in industrial and export processing zones in Ho Chi Minh City, Vietnam

( 2021)

T. T. Hien Ho

;

T. Thanh Lam

;

N. Q. Thinh Le

;

T. K. Oanh Le

The use of thermal generation facilities (TGFs) in manufacturing industries produces of a massive amount of bottom and fly ash (BFA) containing toxins, thus requiring proper management. In Ho Chi Minh city, more than 200 TGFs are in operation but the generation BFA and how it is handled is unknown, posing environmental and health risks if contaminants in BFA are leaching into the environment and accumulated in food webs. This study investigated the fuel demands of and the BFA generation from the TGFs in 17 industrial zones and export processing zones in Ho Chi Minh city to estimate BFA generation rates for various fuels. The results revealed a total consumption of 129,028 tons of diverse fuels per month, among which diesel oil (DO) and coal were of majority, accounting for 85,65% and 9,11% by weight, respectively. In addition to coal and DO, cashew husk, wood, and sawdust were among the most widely used fuels. BFA generation rates for rice husk, coal, sawdust, firewood, and cashew husk were 16.95 ± 28.12%, 10.62 ± 8.84%, 5.57 ± 7.34%, 4.88 ± 3.59% and 0.93 ± 1.37%, respectively. Automatically fuel feeding and small – medium TGFs showed higher BFA generation rates than manually fuel feeding and large ones. The findings help estimate the amount of BFA from MFs on larger scales, such as city, province, and country, which serves to develop an effective management strategy and plan

Publication

Lang creek-section running third campus of Van Lang University: Water characteristics, loading of pollutants and solutions

( 2021)

Thao Ho Phung Ngoc

;

Phuoc Ha Vinh

;

Oanh Le Thi Kim

Pollution of canals and creeks has been an urgent issue in Ho Chi Minh City (HCMC). Canal pollution not only worsens the urban beauty but also greatly affects surroundings and public health. Built on the land with a 600m long of Lang creek running through, the third campus serving most teaching and learning activities of Van lang university will also be affected by pollution of Lang creek. Mutually, these activities would increase the pollution level of Lang canal if wastewater generated from Van Lang university will be untreated before discharged into Lang creek. The study results showed that current water quality of Lang creek was polluted by organic substances, N-NH4+ and microbiological indicator in both dry and rainy seasons when compared with QCVN 08: 2015/BTNMT. However, if compared with QCVN 14: 2008/BTNMT, the water of the canal was polluted just by the N-NH4+ and microbiological parameters in both seasons. Besides, the pollutant load of the discharging sources and the reception capacity of Lang creek that flowing through the third campus of Van Lang University were also estimated in detail in this study. In addition to improving the water quality and environment of the creek, renovating solutions are also proposed in this paper. Besides, this study showed that Van Lang university’s activities would not exacerbate Lang creek’s pollution.

Publication

Formulation and effectiveness of Neem oil shampoo on companion animals

( 2021)

Quyen Vu Thi

;

Anh Nguyen Luong Lam

Neem oil (azadirachtin) is long known as a natural insecticide or medication for humans and animals. This study aimed to formulate an herbal shampoo and understand the efficacy of neem oil in the atopic treatment of companion animals (cats and dogs) of Vietnam. From November 2019 - May 2020, 35kg neem fruits were collected and extracted into essential oil. Four formulas were developed by adding the neem extract in different concentrations (0ml, 5ml, 10ml, 15ml) and endured trial on 40 families having dogs or cats for 2 weeks to evaluate the chemical properties and physical performance of the animals. The four formula surveys on consumers about neem shampoo showed good cleansing and detergency. Significantly, formula 3 (neem oil 10ml; glycerine 40g; bamboo vinegar 5ml; distilled water 150ml; coconut oil 25ml; coco betaine 40ml; vitamin E 4.7mg; pomelo flavor 2g) was selected due to good performance to treat skin diseases, ticks and fleas, and did not irritate people and pets. Further research and development are required to assess its optimal quality and safety

Publication

Candidate word generation for OCR errors using optimization algorithm

( 2021)

D. T. Pham

;

D. Q. Nguyen

;

A. D. Le

;

M. N. Phan

;

P. Kromer

OCR post-processing is an important step to improve OCR text accuracy. It includes two main tasks, error detection and error correction. Hill climbing algorithm is a heuristic search method used for solving optimization problems. In this paper, we present a novel OCR error correction approach using an adapted version of the Hill climbing algorithm. Correction candidates of OCR errors are explored by random character edits and evolved with the Hill climbing. The character edit patterns are obtained from the training data. The proposed model is evaluated on the benchmark dataset in the OCR post-correction competition of the International Conference on Document Analysis and Recognition 2017. It is shown that our model outperforms various baseline approaches in the competition. In addition, the randomness of the proposed algorithm is analyzed to verify its stability under parameter configurations.

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

Publication

Classification of the Kanji character in Japanese using the ANFIS technique

( 2021)

Bac Thi Vo

;

Tri Quoc Truong

Remembering the Kanji character in Japanese is a difficult task for foreign students. To recognize their characteristic, it is necessary to classify the kind of image containing Kanji characters. This research proposes a method to classify such tasks by using the ANFIS technique. We employ a model to learn the feature of the Kanji character image. The numerical result shows a good predictive ability. It also demonstrates a potential application in the educational environment of learning Japanese

Publication

Effects of the top extension of the domain in CFD simulation of solar chimneys

( 2021)

T. N. Huynh

;

Y. Q. Nguyen

Solar chimneys have been widely used for natural ventilation of buildings. It absorbs solar radiation to create stack effect to induce air flow for ventilation. To model air flow and heat transfer inside solar chimneys, numerical models based on Computational Fluid Dynamics (CFD) have been broadly employed. The size of the computational domain is one of the factors influencing computed results from CFD models. In this study, we investigated effects of the extension of the domain above the outlet of the air channel as the gap and the height of the air channel changes. Two types of the computational domains were studied. The small domain has identical physical size with a cavity inside the solar chimney while the large domain contains both the cavity and the ambient air surrounding the chimney. The induced flow rate and temperature rise of the chimney were computed and compared between those domains. It is seen that to ensure the changes of both flow rate and temperature below 1.0%, the required extension, h, of the domain above the outlet of the air channel is a function of the gap – to – height ratio G/H, not only the gap. Specifically, for G/H in the range of 0.1 – 0.4 in this study, the required h/G rises from 10 to 30

Publication

Effects of heat source location on the performance of the solar chimney with a horizontal absorber surface

( 2021)

Y. Q. Nguyen

;

T. N. Huynh

Solar chimney has been studied extensively in many aspects, especially green design and building physics. Various designs of solar chimney have been proposed for improving its performance for a specific application, i.e ventilation and/or heating/cooling. In this work, we studied performance of a solar chimney including horizontal and vertical air channels connected continuously by a numerical model based on the Computational Fluid Dynamics (CFD) method. Two different total lengths and a fixed gap of the chimney were examined with two different heated walls. The considered parameters contained the flow rate, temperature rise, and thermal efficiency. The results show that heating upper wall or lower wall has a minor effect on the examined parameters. The findings can help to choose appropriate materials for upper wall to adapt to environmental conditions

Publication

Numerical simulation of thermal behavior for electronic enclosure

( 2021)

Tue Nguyen Duy

Electronic is a significant device in our daily life. To ensure its good performance, the temperature of chips must not exceed 80°C. For a long time, Computational Fluid Dynamic (CFD) has been a powerful tool to analyze fluid flow, heat exchangers, and other equipment that have been applied widely in industry. In this paper, the authors designed the electronic enclosure and used CFD Autodesk to analyze its thermal performance. The three types of electronic enclosures are a/ the enclosure without any ventilation slot; b/ the enclosure with both ventilation slots on the top and the bottom of it; c/ the enclosure with both ventilation slots on the left and right of it. The 2 same power small chips and the large chip whose power were 0.5W and 2W, respectively, were used as the heat source. Moreover, the effect of the radiation heat transfer of the surface enclosure was also analyzed. The result shows that the enclosure which has both ventilation slots on the top and bottom has more efficiency than others. Also, the radiation heat transfer plays a vital role in enclosure cooling without the fan. For that reason, covering the white coating with emissivity ε=0.9 or the black coating with emissivity ε=0.98 is an excellent way to decline the temperature of the enclosure by radiation heat transfer.

Publication

IoT based detection, monitoring and automatic cleaning system for soiling of PV solar panel

( 2021)

Wilen Melsedec O. Narvios

;

Y. Q. Nguyen

Solid particles impair the performance of the photovoltaic (PV) modules. The results in power losses that lower the system’s efficiency also decrease the life expectancy of the panel. An Internet of Things (IoT) based system was made to monitor, detect dust accumulation, and a cleaning system that would automatically wipe the dust on the surface of the PV solar panels. Using a specific dust sensor, it detects and monitor the amount of dust in the panel. As the dust accumulated reaches its limit, the cleaning system triggers automatically. The ambient temperature was monitored using the temperature and humidity sensor. The data will be received via internet using the Blynk app. The system will address the panel’s dust accumulation problem as it was considered one of the biggest problems globally regarding solar energy reproduction

Conference Proceedings - 2021

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