Minh City’s research while affiliated with Ho Chi Minh City University of Technology and other places

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Publications (163)


Fig. 1 SEM images of a BA, b BM, and c BC at the 10-μm scale. SEM images of d BA, e BM, and f BC at the 200-nm scale. g FTIR spectra (the colors of texts correspond to the adsorption peaks of each biochar)
Fig. 2 Effect of biochar dose (a, b), and pH (c, d) on MB adsorption at the initial concentration of 50 mg/L
Fig. 4 Effect of temperature (25-45°) on MB removal of a BA, b BC, and c BM
Fig. 5 The fitting results of the experimental data of MB adsorption to nonlinear kinetic models: a BA, b BC, and c BM
Fig. 6 The fitting results of multilinear kinetic models to MB adsorption data by BA: a IDP, b Bangham; BC: c IDP, d Bangham; and BM: e IDP, f Bangham

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Converting biomass of agrowastes and invasive plant into alternative materials for water remediation
  • Article
  • Full-text available

February 2025

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5 Reads

Thi Thanh

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Huyen Nguyen

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Xuan Cuong Nguyen

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[...]

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Minh City

Three types of biomass of invasive plants and agrowastes, namely, the wattle bark of Acacia auriculiformis (BA), mimosa (BM), and coffee husks (BC), were converted into biochars through slow pyrolysis and investigated for their ability to remove dyes in water. The properties of the materials were characterized using Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET) analysis. The BET surface area (total pore volume) of BC was 2.62 m 2 /g (0.007 cm 3 /g), far below those of BA and BM with 393.15 cm 2 /g (0.195 m 3 /g) and 285.53 cm 2 /g (0.153 m 3 /g), respectively. The optimal adsorption doses for the removal of methylene blue (MB) were found to be 2, 5, and 5 g/L for BC, BA, and BM, respectively. The suitable pH ranges for MB removal were 6-12 for BA, 7-12 for BC, and 2-10 for BM. The majority of MB (over 83%) was removed in the initial 30 min, followed by a more quasisteady state condition after the removal rate exceeded 90%. The experimental data were fitted with the kinetic models (PFO, PSO, Bangham, IDP), indicating that physicochemical adsorption, pore diffusion process, and multiple stages are the dominant mechanisms for the MB adsorption onto biochars. Finally, BA and BM showed similar adsorption efficiencies, while BC may not be favorable for use as an adsorbent due to its low surface area and low pore volume.

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Tools' Results Comparison.
Generalization capability test results.
A Study on Deep Graph Neural Networks for Security Vulnerabilities Detection in Web Applications

December 2024

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32 Reads

Security becomes a top priority as the role of information technology and communication continues to grow, accompanied by the proliferation of web applications in every aspect of life. With every interactive application handling the information of thousands of customers, even a single vulnerability can lead to cascading effects and significant harm to individuals and organizations. The demand for tools and techniques to support vulnerability assessment and detection is increasing to mitigate the potential for such serious consequences. Furthermore, with the advent of data-driven approaches, deep learning to assist in vulnerability detection and software security assessment is gaining significant attention. In this paper, we investigate the ability to predict security vul-nerabilities in source code using a combination of data mining and deep learning techniques. Specifically, we focus on improving the efficiency of detecting vulnerabilities in websites written in PHP by employing a combination of Deep Graph Convolutional Neural Network (DGCNN) and Code Property Graph (CPG). Furthermore, we propose a novel feature engineering technique tailored for code analysis and evaluate its performance compared to existing methods. Our results demonstrate the efficacy of our approach in enhancing vulnerability detection, offering a promising direction for future research and development in software security.


Fig. 1. Maslow's hierarchy of needs (1943)
Fig.2. Modified research model
DESCRIPTION OF FACTORS
Investigating The Relationship between Workers’ Needs and Commitments to Garment Enterprise

This paper analyzes the relationship between workers' needs and commitments to garment enterprises. Data is collected from the direct survey through the questionnaire will determine the level of satisfaction of garment workers' needs based on the Hierarchy of Needs (Maslow, 1943), and the commitment between the worker and the garment enterprise. Then, through statistical analysis to review and test the influence of each factor on worker commitment to the enterprise. The research results show that factors affecting workers' commitment to garment enterprises include: social needs; physiological needs related to business policies and the lives of workers; safety and respect needs. Keywords-needs of garment workers; commitments with garment enterprises; social needs; physiological needs; safety and respect needs.


The determinants of digital competencies in accounting: an empirical study in Vietnam

November 2024

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74 Reads

Purpose-This study investigates the determinants of digital competencies (DC) of students and professionals in accounting. Design/methodology/approach-A total of 278 valid questionnaires were collected from 145 accounting students and 133 professionals to test the relationship between some characteristics of learners through the t-test and two-way ANOVA test. Findings-The results showed a difference in DC between students and professionals. Whereas the characteristics of students do not influence their DC, gender and the number of short courses significantly affect their DC. Information and communication technologies (ICTs) should be provided in accounting programs as core competencies. Research limitations/implications-A sample size that is not too large and does not include learners and professionals in the central and northern areas is problematic. Practical implications-The key findings support the development of policies for digital transformation in accounting. Originality/value-Accounting is one of the professions that must keep up with the changes in the world, which is in the process of rapid digitalization. Hence, this study is valuable for accounting practitioners, higher education institutions and managers to enhance DC continuously.


Figure 1 A flow chart to present the process of enrollment.
Figure 2 Numbers of patients requiring intensive respiratory or vasopressor support and death patients for each level of pneumonia severity.
Figure 3 ROC curve for prediction of IRVS and mortality using CURB-65 and SMART-COP in patients with melioidosis pneumonia.
Severity assessment in melioidosis pneumonia: validity of PSI, CURB-65, and SMART-COP scoring criteria

November 2024

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44 Reads

AME Medical Journal

Background: Pneumonia is a common clinical presentation of Burkholderia pseudomallei infection. Along with the development of melioidosis rapid diagnostic tests, prognostic assessment [including prediction of intensive respiratory or vasopressor support (IRVS) need and death outcome] for melioidosis pneumonia (MP) patients at admission is essential. Study to compare pneumonia scoring systems, likewise the mortality scoring system for acute melioidosis, among MP patients is still lacking. This study aims to evaluate the validity of these scores in predicting MP patients. Methods: A prospective cross-sectional study was conducted from October 2019 to February 2022 at the Respiratory Department of Cho Ray's Hospital, Ho Chi Minh, Vietnam (the largest central hospital in Southern Vietnam). All adult MP patients hospitalized with a medical history ≤2 months were enrolled conveniently and consecutively. Pneumonia severity index (PSI), CURB-65 (acronym for confusion, urea, respiratory rate, blood pressure and age ≥65 years), and SMART-COP (acronym for systolic blood pressure, multilobar infiltrates, albumin, respiratory rate, tachycardia, confusion, oxygen and pH) as well as the acute melioidosis mortality scoring system were evaluated. Results: Of 66 MP patients, mean age was 51±11 years, and male gender accounted for 86.4% (57/66). Patients requiring IRVS constituted 34.8% (23/66) and the mortality rate at discharged was 25.8% (17/66). The areas under receiver operating characteristic curve (AUCs) of PSI, CURB-65, and SMART-COP in predicting the IRVS need were 0.813 [95% confidence interval (CI): 0.684-0.943, P<0.001], 0.868 (95% CI: 0.767-0.969, P<0.001), and 0.910 (95% CI: 0.825-0.994, P<0.001), respectively. The AUCs of PSI, CURB-65, SMART-COP, and the mortality score of acute melioidosis in predicting the death outcome were 0.698 (95% CI: 0.536-0.857, P=0.02), 0.797 (95% CI: 0.665-0.928, P<0.001), 0.797 (95% CI: 0.673-0.920, P<0.001), and 0.663 (95% CI: 0.524-0.801, P=0.05), respectively. CURB-65 score is non-inferior to SMART-COP in predicting MP patients. The sensitivity, specificity, and positive likelihood ratio for CURB-65 score ≥2 in predicting the IRVS need were 69.57%, 90.70%, and 7.48, respectively and in predicting the mortality 70.59%, 83.67%, and 11.53, respectively. Conclusions: MP could present mild to severe clinical scenario, with higher mortality in severe MP cases. The CURB-65 score could be simple and useful in predicting the IRVS need or the death outcome among MP patients.


Fig. 2. Placing computer vision's and computer graphics' camera
Graphics and vision's camera calibration and applications to neural radiance fields

September 2024

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70 Reads

Pre-training and fine-tuning are important tasks for developing deep-learning models in many modals, e.g., image, video, and text. Recently proposed works enable Neural Radiance Fields (NERF) ready for using with those two tasks. In combination with training and tuning , techniques for enriching data, for example, data augmentation and masking, are also crucial for making deep-learning successfully. Inspired by the field of computer vision (e.g., classification, detection, segmen-tation, and so on) where the data augmentation have been performed online for each input batch; in NERF, we plan to use computer graph-ics' libraries (especially, OpenGL) to generate views online with virtually posed cameras. Practically, OpenGL has a camera frame; however, this kind of cameras is configured differently to the one in computer vision. Specifically, OpenGL's cameras do not have intrinsic camera matrix as in computer vision. This paper presents an approach to calibrate cameras in the two fields, i.e., computer vision and OpenGL. The developed technique enables to generate views online that can be integrated naturally to NERF's research works. Utilizing fundamental features of graphics pipelines, e.g., geometric transformation, lighting, shading and textur-ing, the proposed technique is able to support similar operations in the data augmentation for images, video and text. Experiments in this paper shows that: (a) the intrinsic camera matrix can be loaded into the projection matrix in OpenGL; (b) the intrinsic camera matrix used by the proposed technique can be successfully recovered by COLMAP[1], which means that our calibration method is workable; and (c) the generated views can used with nerfstudio[2] to generate 3D-models, which means that the proposed method can generate views that are compatible with NERF's algorithms.


Curbing Environmental Degradation to Balance Sustainable Development: Evidence from China

September 2024

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20 Reads

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4 Citations

Environmental and Sustainability Indicators

To achieve the goals of sustainable development, it is crucial to check the balance of increased level of international trade along with financial development, foreign direct investment (FDI), energy consumption, and institutional advancement with the quality of the environment. This study focuses on how these variables have caused environmental degradation in China. To achieve Goal 13 of the Sustainable Development Goals (SDGs), i. e. to increase the nation's resilience to natural disasters and hazards related to climate change, to promote climate action and safeguard life as part of sustainable development, this involves the analysis of time-series data sets from 1975 to 2021 and the use of the dynamic version of ARDL (Autoregressive Distributed Lag) cointe-gration or simulation model. The results show that FDI is essential for lowering carbon dioxide (CO2) emissions over the long term, but financial development, the volume of international trade, and the level of energy use or consumption contribute to environmental deterioration. Moreover, China's environmental degradation is decreased by high institutional quality. To accomplish the SDGs and reduce environmental degradation, it is essential to take into account how these elements interact and to adopt a holistic strategy that includes regulations , policies, and education. On the basis of our trustworthy findings, suggestions are made to keep the sustainable development.


Fig. 1. The Map of Lagos in Nigeria. Source: Mogaji, 2020.
Fig. 2. People rushing to catch the Danfo bus highlight the inherent challenges for CWD.
Fig. 3. Commuter-to-Commuter Dynamics in Public Transport.
Demographics information of CWD participants (Phase 2 and 3).
Commuter-to-Commuter interaction's impact on travel satisfaction and wellbeing for commuters with disabilities

September 2024

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230 Reads

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1 Citation

Transportation Research Part D Transport and Environment

This study investigates the influence of fellow passenger interactions on travel satisfaction and wellbeing among commuters with disabilities (CWD) in a developing country. Employing qualitative methods such as ethnography and interviews, it explores the challenges CWD faces in public transport. In addition to building on previous studies regarding interaction on public transport, the study introduces the concept of Commuter-to-Commuter interaction. This study unveils the impact of fellow passengers on travel experiences and categorises interactions as positive, neutral, or negative, elucidating key features of this dynamic. Understanding these interactions is pivotal for developing interventions aimed at improving transportation accessibility. Unlike previous studies focusing on religion, race, gender, and age, this research addresses a gap by focusing on disabilities. Enhancing comprehension of inclusion dynamics informs policies for more equitable transportation systems, ultimately contributing to a supportive and accommodating environments for all commuters, including those with disabilities.


ORIENTAL JOURNAL OF CHEMISTRY Sequent Adsorption of phosphate ions by Copper ions Adsorbed on Tripolyphosphate Chitosan

July 2024

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13 Reads

In this study, we successfully crosslinked chitosan using STPP and produced chitosan beads to adsorb copper ions and subsequently phosphate ions from aqueous solutions. The optimal concentrations of chitosan (2%w/v) and STPP (7.5%w/v) during chitosan beads preparation and the optimal pH of 5.0 during adsorption were determined. Several adsorption models, including pseudo-first-order, pseudo-second-order, Langmuir, and Freundlich models, were used to evaluate the static adsorption experimental data. Moreover, the chitosan beads were applied in a dynamic adsorption column and several models including Bohart-Adam, Thomas, Yoon-Nelson, and Clark models were used to describe the system. This study showed that after adsorbing heavy metal ions, chitosan-STPP beads can be used for further adsorption of toxic anions from wastewater.


Energy for Sustainable Development 80 ( Techno-economic analysis case study of energy production utilizing cashew shell agro-waste in Vietnam

June 2024

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117 Reads

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1 Citation

Energy for Sustainable Development

In this paper, a system for energy production from biomass combustion to provide electricity to the national grid of Vietnam was evaluated based on different thermodynamics systems and the cultivation capacity of the local area. A 20:80 mixture of cashew shell and cashew wood chip is considered as fuel source to be combusted utilizing a fixed bed technology with high energy efficiency. Considering a 10 MW production capacity to the national grid, a 20-year Net Present Value analysis and payback time evaluation were considered based on the economic factors in Vietnam. The study demonstrates how the current feed-in tariff in Vietnam is too low to encourage investment in biomass power plants. Following a suggested electricity selling price that is close to the household electric cost, the power plant shows high potential with a short payback period of 9.22 years and a levelized cost of electricity (LCOE) of only 6.4 cents/kWh. Sensitivity analyses were performed for different scenarios of material cost, electricity selling price, and initial investment to show that within a 10 % variation in process factors, such a project would still be able to reach payback within 20 years, with an overall LCOE of around 5–7 cents/kWh, proving the high potential of biomass-based energy production projects.


Citations (42)


... In recent years, global environmental degradation has received special a ention from scholars, firms, and policymakers [1][2][3]. Acknowledging its significance, businesses started emphasizing both financial rewards as well as their contributions to society and the environment in particular [4]. To address growing environmental concerns endangering sustainability in today's dynamic landscape, businesses have devoted substantial a ention towards adopting green innovation (GI). ...

Reference:

Green Innovation in Business: A Comprehensive Bibliometric Analysis of Trends, Contributors, and Future Directions
Curbing Environmental Degradation to Balance Sustainable Development: Evidence from China

Environmental and Sustainability Indicators

... Vũ Quốc Thắng và cộng sự (2021) cho biết dược sĩ công tác tại bệnh viện có QWL ở mức thấp so với trình dược viên [6]. Ketsana và cộng sự (2024) nhận định rằng nhân viên y tế làm việc tại bệnh viện hài lòng với QWL, song cũng chỉ ra các yếu tố tuổi, tình trạng hôn nhân, số người phụ thuộc có ảnh hưởng đến QWL [7]. Trong lĩnh vực y tế, các đề tài chủ yếu khảo sát QWL trên đối tượng nhân viên làm việc tại các khoa phòng của bệnh viện. ...

QUALITY OF WORKING LIFE AMONG HEALTHCARE WORKERS IN THONG NHAT HOSPITAL, HO CHI MINH CITY 2023

... Furthermore, according to Benner and Tushman (2002), Levinthal (1993), and McGrath (2001), exploratory innovation necessitates either gaining new knowledge or discarding old knowledge that already exists. There is an imbalance between exploitation and exploratory operations in Vietnamese real estate brokerage firms, according to research by Luan Pham (2024). According to the study, the organization's workers engage in more exploitation than exploration. ...

The relationship between work motivation and individual ambidexterity behavior affects the task performance of real estate market employees.

... In recent years, there has been a growing interest in integrating innovative technologies to enhance the tourist experience while promoting sustainability in ecotourism destinations [11,13]. One such technology that shows great potential is Bluetooth Low Energy (BLE) beacon technology [3,[8][9][10]15]. ...

A Tourism Support Framework using Beacons technology

... Causes of flooding include rainfall, watershed characteristics, river flow capacity, land use changes, and river management ranging from regional planning to regulation. [3] New technologies such as IoT are proposed to overcome these obstacles by utilizing faster internet connectivity. ...

Estimating disease burden of rotavirus in floodwater through traffic in the urban areas -A case study of Can Tho city, Vietnam

... Twenty-nine isolates shown positive for both urea hydrolysis, nitrate reduction and five isolates shown negative. Similar results were obtained in studies conducted by Nguyen et al. (2022) [12] and Nohwar et al. (2019) [13] . ...

Isolation and characterization of Rhizobium spp. and Bradyrhizobium spp. from legume nodules

... Furthermore, the solubility of copolymers is an important issue in industrial wastewater treatment and pharmacy [19][20][21] . Indeed, the addition of additives such as salts, urea into associates of such surfactants will change their physicochemical properties, including the degree of ionization, reaction rates, clouding and/or phase separation [22][23][24][25] . ...

Impact of double headed geminis on leucine and ninhydrin reaction in buffer solvent
  • Citing Article
  • June 2023

Colloids and Surfaces A Physicochemical and Engineering Aspects

... Tại Việt Nam, bệnh nhân ghép thận đầu tiên vào năm 1992, số lượng bệnh nhân ghép thận trên 1.500 trường hợp (năm 2016) trường hợp và ngày càng tăng [7]. Tuy nhiên, việc sử dụng ATG dẫn nhập ở bệnh nhân ghép thận nguy cơ thấp còn ít. ...

PREVALENCE RATE OF CMV INFECTION IN PATIENTS AFTER KIDNEY TRANSPLANTATION IN VIET NAM

European Journal Pharmaceutical and Medical Research

... Accordingly, even with low per capita income levels, developing countries can accelerate their development and break free from the vicious cycle of poverty initiated by (Lacher and Nepal, 2010). Rostow (1960) postulates that the different stages of a host country's development processes will have varying impacts on income inequality, as per modernization theory, while FDI inflows may initially increase income inequality in the early stages of development, this effect diminishes as an optimal development stage is reached (Nguyen, 2023). In contradiction to modernization theory, dependency theory challenges the detrimental distributive impacts of foreign direct investment, addressing the issue of inequality from the perspective of the global economy and historical context, and claiming that what affects income inequality is not economic output or wealth per se but rather the social control and organization of production (Chase-Dunn, 1975 From another point of view, the North-South FDI model introduced by Feenstra and Hanson (1997) argues that FDI inflows into developing economies can lead to greater income inequality due to directed comparative advantages. ...

The role of digitalization in the FDI -income inequality relationship in developed and developing countries

Journal of Economics Finance and Administrative Science

... Ấu trùng cá ngựa vằn AB ở giai đoạn 3,5 dpf được xử lý với các nồng độ cao chiết 250-1750 µg/mL) trong 72 giờ. Quy trình xử lý dược liệu và đánh giá tỷ lệ sống của cá ngựa vằn được mô tả bởi nhóm tác giả Nguyễn Thành Vũ và cộng sự 2022 [16]. Tỷ lệ sống của ấu trùng được ghi nhận sau mỗi 12 giờ xử lý. ...

Keap1/Nrf2-independent antioxidative activity of Phyllanthus amarus extract in zebrafish

Vietnam Journal of Biotechnology