Journal of Science and Technology - IUH

RESEARCH ON CONSUMER USE INTENTION FOR ELECTRIC COMMERCE PLATFORMS INTEGRATED ARTIFICIAL INTELLIGENCE (AI)

2024-10-22T04:28:43+00:00

The rapid development of artificial intelligence (AI) in the e-commerce sector has changed the way consumers shop online. This study aims to evaluate and research factors that influence users' intention to use e-commerce platforms with integrated AI. The study uses the technology acceptance model (TAM), theory of reasoned action (TRA), theory of planned behavior (TBP) and diffusion of technology theory (DOIT) to design the model. With data from 314 customers interested in e-commerce with AI integration, structural equation modeling (SEM) was used to test the model. The results show that subjective norms have a significant influence on perceived ease of use, thereby forming positive attitudes and curiosity, strongly promoting the intention to use AI to support shopping. online. Similarly, perceived usefulness has a significant influence on intention to use AI for online shopping. The findings help researchers and businesses better understand consumers' intentions to use AI to assist with shopping.

TBP-EET INTEGRATED MODEL OF UNIVERSITY STUDENTS’ DIGITAL ENTREPRENEURSHIP INTENTIONS – A CASE STUDY OF INDUSTRIAL UNIVERSITY OF HO CHI MINH CITY

2024-11-24T13:37:29+00:00

Nowadays, digital entrepreneurship offers more opportunities for development and survival than traditional business methods due to the boom of the digital economy and e-commerce. In this article, the factors affecting the digital entrepreneurship intention of students at Industrial University of Ho Chi Minh City are examined and discussed based on two theories: The Planned Behavior (TPB) and Entrepreneurial Event Theory (EET). Quantitative data were collected from 302 students in four majors: Business Administration, Marketing, International Business and E-commerce. The selected data were then processed and analysis through SPSS and AMOS statistical software. The results show that four factors, including personality traits, digital entrepreneurship education, attitude essence, and technology inclination, have an indirect positive influence on digital entrepreneurship intention through perceived feasibility, while the risk propensity has a direct impact on digital entrepreneurship intention. From the findings, the study provides some managerial implications for higher education administrators to find ways to promote awareness and confidence, thereby inspiring the spirit of digital entrepreneurship right from the time they are still studying at universities.

FACTORS AFFECTING CONSUMERS' INTENTION TO BUY DOMESTIC ORGANIC FOOD IN HO CHI MINH CITY

2024-10-23T03:29:51+00:00

The problem of contaminated food and high antibiotic residues causes the problem of food poisoning, as well as serious impacts on people's health. In the current context of food poisoning, people are paying more and more attention to health and healthy lifestyles, which makes shoppers have better considerations and priorities for products. Obstacles in choosing foods cause health problems for themselves, organic foods are the first concern of consumers. To achieve the goals of identifying and measuring the factors affecting the intention to buy domestic organic foods, the author has based on the rational action theory model, planned behavior theory to design the research model. With a sample of 200 consumers intending to consume local organic food in Ho Chi Minh City, the hypotheses were tested by Cronbach's Alpha reliability analysis, EFA discovery factor, linear regression. The results show that health consciousness, perception of price, quality, attitude and subjective standards are factors that significantly influence consumers' intention to buy domestic organic food. The research has assisted food suppliers to come up with solutions to improve people's intention to use domestic organic food, especially in terms of product quality.

Ho Chi Minh’s thought on culture and its application in preserving and promoting national cultural values in the digital age

2025-02-21T01:23:09+00:00

The scholarly article “Ho Chi Minh’s Thought on Culture and Its Application in Preserving National Culture in the Digital Age” provides an in-depth analysis of Ho Chi Minh’s perspective on culture, viewing it as the spiritual foundation, driving force, and goal of social development. Ho Chi Minh’s thought emphasizes the close relationship between culture, economy, and politics, while affirming the importance of harmoniously combining national traditions with the cultural essence of humanity. In the digital age, the article proposes solutions such as applying modern technology to digitize and promote culture, developing supportive policies, and leveraging the role of communities, especially the younger generation, in cultural preservation. It underscores the significance of Ho Chi Minh’s thought in protecting and developing national culture, contributing to affirming Vietnam’s identity in the context of globalization.

A REVIEW ON THE USE OF MOBILE APPS IN ENHANCING VOCABULARY ACQUISITION FOR LANGUAGE STUDENTS

2025-03-19T09:14:30+00:00

This research seeks to determine the efficiency of mobile applications as tools for acquiring vocabulary especially within language learning environment. It also examines the impact of these tools on the teaching processes and interaction with the audience, as well as the resulting learning effect obtained with their help. This review is based on existing empirical studies and meta-analyses conducted within the last decade. The inclusion criteria when selecting the research focused on the definition of vocabulary, methodological quality, and the variety of mobile applications in the studies. An emphasis on the use of qualitative research was considered, and the data was collected from academic databases and peer-reviewed journals. The study shows mobile apps greatly help in increasing vocabulary learning by promoting interactivity, usability, and contextualized learning. Particularly when using the techniques like gamification, spaced repetition, and multimedia the apps are seen to demonstrate higher engagement and retention of the users. In addition, different with conventional teaching modalities, enhancing mobile apps enable learners to learn interactively and continually. Additionally, it was evident that mobile applications are handy in facilitating word acquisition, providing significant enhancements over conventional ways. These vary in the way they are presented, allows for quick feedback and learning, and can incorporate real life contexts. The study recommends that the mainstream integration of mobile apps in language learning contexts should be factored so as to unlock such benefits. Also, the developers of the apps should enhance designs and features that would make the apps much more engaging and grounded in research. Further research will need to look into long-term mobile app impacts on vocabulary mastery and future work should investigate how mobile applications can be incorporated with other learning technologies to form a more complex learning environment.

A STUDY ON THE CHALLENGES EFL STUDENTS FACED WITH IN PUBLIC SPEAKING AND THE PROPOSED SOLUTIONS

2025-04-02T09:11:51+00:00

This study aimed to investigate the factors that limit the public speaking ability of English major students and propose practical solutions for improvement at a Vietnamese university. As stated by Van Emden & Becker (2004), good presentation skills provide learners with abilities and qualities that are highly valued in the labor market such as critical thinking, management skills, leadership skills and professional communication skills. In order to provide a more comprehensive understanding of the research problem with in-depth personal viewpoints, the study utilized two primary instruments: a structured questionnaire with 141 participants and semi-structured interviews with 10 participants. The results have revealed the multifaceted challenges faced by EFL students in public speaking which are related to preparation and experience, presentation of physical, visual and story messages, and other external factors such as classroom environment, teaching methods and peer pressure. Based on the findings, proposed solutions, such as structured practice, targeted workshops, and supportive tools, are believed to significantly enhance learners' public speaking proficiency. Although the study is limited due to its sample size and time constraint, it suggests avenues for future research, including longitudinal studies with observations and self-reported instruments to assess how sustained use of technology-based platforms influences public speaking performance for months or years.

IMPLEMENTATION OF OUTCOMES-BASED EDUCATION – EXPERIENCE LESSONS FROM OUTCOMES-BASED EDUCATION PRACTICE AT THE INDUSTRIAL UNIVERSITY OF HO CHI MINH CITY

2024-02-21T08:02:57+00:00

Outcomes-based education (OBE) is an educational principle proposed in the 1990s in America. This educational principle then attracted attention, research, and implementation in many countries around the world. Many studies have demonstrated the positive impact of OBE practice in higher education. In recent years, this principle has been studied and implemented by many universities in Vietnam at different levels. This article summarizes the results of a number of domestic and foreign OBE important studies, describes the OBE implementation process at the Industrial University of Ho Chi Minh City in the past 5 years, and the lessons learned from that process.

GENERAL THERMODYNAMIC MODEL FOR ANALYSIS OF TWO-STAGE VAPOR COMPRESSION REFRIGERATION SYSTEM USING R32 REFRIGERANT

2025-03-26T01:53:20+00:00

Two-stage vapor compression refrigeration systems improve the cooling coefficient (COP) by performing compression in two stages, reducing the heat load on the compressor and improving energy efficiency. When using R32 refrigerant, the system not only achieves higher cooling efficiency but is also more environmentally friendly. In this study, a thermodynamic calculation program for two-stage vapor compression refrigeration systems was performed to investigate the effects of sub-cooling, de-superheating and intermediate pressure on COP. The sub-cooling and de-superheating parameters were varied from 0 to 1 to investigate a variety of cycles from single stage to multiple two-stage cycles. The results showed that the intermediate pressure deviation ratio should be between 1.02 and 1.04 to achieve the largest COP. The two-stage vapor compression refrigeration cycle with complete sub-cooling and complete de-superheating in the intermediate tank has a COP of up to 3.5 while the single-stage vapor compression refrigeration system achieves a COP of 3.1 under the same operating conditions.

DESIGN AND OPTIMIZATION OF A NOVEL DAMPER USING MAGNETORHEOLOGICAL FLUID AND BALL SCREW MECHANISM FOR AUTOMOTIVE APPLICATIONS

2025-03-06T02:31:00+00:00

This study presents a novel design of a damper utilizing magnetorheological fluid (MRF) for automotive suspension systems, aiming to enhance damping force compared to previously studied MR-based dampers. The proposed damper integrates the principles of a ball screw and magnetorheological brake to convert rotational motion into linear motion. In this research, prior studies relevant to the topic are reviewed and analyzed. Subsequently, the design and modeling of this new damper is carried out using the Bingham plastic model and the finite element method (FEM). Mathematical models will also be developed to calculate the damping force and friction torque of the proposed damper. To achieve the required damping force at the lowest production cost, the particle swarm optimization (PSO) method is applied to optimize the design of proposed MR damper. The optimized parameters are then used to fabricate a prototype and test its practical performance. The experimental results are compared with simulation data. The novel magnetorheological fluid damper offers an efficient solution for vibration control across various applications, including automotive systems, machinery, and buildings. Ultimately, this research aims to deliver improved damping performance and foster widespread practical applications.

SIMULATION AND ANALYSIS OF MICRO-BEAM STRUCTURE FOR PIEZO-RESISTIVE MEMS STRAIN SENSORS TO APPLY IN STRUCTURAL HEALTH MONITORING SYSTEMS

2025-03-20T06:14:41+00:00

Stress is one of the main parameters to monitor the condition of the infrastructure such as bridges, roads, buildings, and high-speed train rails in the structural health monitoring system (SHMS). Microelectromechanical systems (MEMS) piezo-resistive strain sensors are often used for advanced applications due to their small sensor size, low power consumption, and high sensitivity. Typically, the strain sensor structure is made of a thin layer of metals, alloys, and semiconductor materials such as silicon. In this study, the new structure of the micro-beam is simulated to measure stress and strain by the Finite Element Method (FEM). The piezoresistive effect of semiconductor materials such as silicon is used to measure stress and strain with high sensitivity. Finally, the results show that the stress increases up to 35.92% with the micro-beam structure because the stress is amplified in only one direction while the other stresses in the other directions are close to zero.

A Hybrid Algorithm Based on K-L Expansion and Interval Analysis Method for Dynamic Load of Vehicle - Bridge Interaction System with Uncertainty

2025-01-15T03:28:56+00:00

Dynamic load identification of vehicle-bridge interaction system with uncertain parameters is studied in this paper. The vehicle is modeled by a two degrees of freedom mass-spring system and the bridge is modeled as an Euler-Bernoulli beam. A hybrid method that combines the Karhunen-Loève expansion and the interval analysis method is proposed to determine the midpoint value, lower and upper bounds of dynamic load acting on the vehicle-bridge system with uncertainty. The road surface roughness and excitation force of the bridge, which are assumed as Gaussian random processes, are described by the Karhunen–Loève expansion. Uncertain parameters of the structure are considered as interval variables, due to the fact that only their bounds are needed. The moving load identification algorithm can be formulated into an computational inverse problem. To prove the results obtained by proposed method HKIM, the interval analysis method (IAM) is also implemented. The results obtained by proposed method are effective for dynamic load of system with uncertainty.

RESULTS OF RESEARCH ON USING CEMENT PILE FOUNDATION IN QUANG NGAI CITY AREA

2025-06-30T09:24:55+00:00

Cement piles are widely used in the treatment of foundations and weak soil for construction works of traffic, irrigation, airports, ports... such as: making waterproofing trenches for dikes and dams, repairing seepage of culverts and culvert bottoms, reinforcing soil around tunnels, stabilizing retaining walls, preventing landslides for slopes, reinforcing roadbeds, bridge abutments... In Quang Ngai city, cement piles were first used at the Hotel Central project in 2005. In recent years, a series of projects such as Hung Vuong Hotel, Huyndai Company Showroom, Bau Ca Phat Dat Residential Area... have used cement piles as a foundation solution for low-rise buildings (less than 9 floors), reducing construction costs and being economically effective. In this research, the author presents the results of the study on the use of cement soil piles in the geological conditions of Quang Ngai city, based on a number of projects under construction.

EXTENDED PRODUCER RESPONSIBILITY (EPR): INTERNATIONAL EXPERIENCE AND POLICY IMPLICATIONS FOR VIETNAM

2025-03-21T02:18:12+00:00

The significant increase in the production and consumption of single-use plastic packaging has led to a plastic waste crisis in Vietnam, necessitating effective waste management solutions. This study provides a comprehensive analysis of the implementation of Extended Producer Responsibility (EPR) for plastic packaging waste in Vietnam, utilizing the ROCCIPI analytical framework and drawing comparisons with international experiences from Germany, Japan, and South Korea. Through document analysis and in-depth interviews with over 20 experts, the study identifies substantial gaps between Vietnam and advanced countries regarding recycling rates and waste management efficiency. Major challenges include an incomplete legal framework, limited recycling infrastructure, weak corporate capacity, and low community awareness. The study proposes a multifaceted strategy, including legal reforms, technological investments, capacity building, and strengthened communication efforts. The research particularly emphasizes the importance of cross-sectoral and international cooperation in sharing experiences, resources, and technology. The findings provide scientific and practical grounds for the formulation of EPR policies in Vietnam aimed at building a circular economy and achieving sustainable development.

COBALT CATALYSIS FOR CH4 AND CO2 REFORMING REACTION: EFFECTS OF ALKALI AND ALKALINE EARTH METAL PROMOTERS

2025-06-30T08:01:49+00:00

This study investigated the effects of alkaline earth metal oxide (Ca) and alkali metal oxide (K) promoter on the physicochemical properties and activity of Al₂O₃-supported cobalt catalysts in the CH₄ reforming reaction with CO₂. The selected Al₂O₃ carriers have a mixed alpha and gamma structure. The cobalt oxide active phase and the promoter are dispersed on the support by capillary impregnation. The effect of the promoter has been shown to reduce the size of the cobalt oxide catalyst and increase the basic of the catalyst. The conversions of CO₂ and CH₄ as well as the efficiency of CO and H₂ products increased when the reaction was carried out on K-Co/MA and Ca-Co/MA catalysts compared to Co/MA catalysts. An H₂/CO ratio close to 1 is ideal as a feedstock for Fisher Tropsch synthesis. In addition, the carbon residue covering the catalytic surface is rapidly oxidized to facilitate the reaction and maintain stable activity.

TECHNICAL PROPERTIES AND PRESERVATION ABILITY OF SPRAY-DRIED RED-FLESH DRAGON FRUIT (HYLOCEREUS COSTARICENSIS) POWDER

2025-02-25T02:49:58+00:00

Red-fleshed dragon fruit (Hylocereus costaricensis) is a nutritious, antioxidant-rich tropical fruit with a high sensory value; nonetheless, it has a short harvest season and is perishable. The spray drying technique was used to turn dragon fruit into powder to increase storage time and applicability in the food technology business. This study evaluates the recovery efficiency, physical qualities, biologically active component content, and preservation ability of spray-dried red-meat dragon fruit powder with maltodextrin (DE11. 9) at 2 degrees Brix of 15 and 20 during 6 weeks of storage at 50℃. The results showed that the drying solution with Brix 15 and 20 had recovery efficiency of 57% and 65.205%, respectively. The content of active ingredients after spray drying at Brix 15 was higher than that at Brix 20, although both demonstrated high concentration and good storage stability. The physical attributes of the two powders change, with the water absorption index (WAI) increasing, the water solubility index (WSI) decreasing, particle size increasing, and the powder's color becoming brighter, less red, and bluer as the maltodextrin content increases. The findings indicate that spray-dried dragon fruit powder has a potential application in the food business.

A STUDY OF FORMULATION AND CHARACTERIZATION OF NANO LIPOSOMES FROM Cordyceps militaris EXTRACTS USING MEMBRANE HYDRATION

2025-06-30T06:37:19+00:00

In this study, a simple procedure for the preparation of nano liposomes encapsulating extracts from Cordyceps militaris using the membrane hydration method was performed. The extraction of the mushroom extract was carried out using an ultrasound-assisted method with water as the solvent, and the extract was encapsulated using nano liposomes made from lecithin. Several factors influencing encapsulation efficiency and particle size of the nano system were investigated. The characteristics of the nano system were determined using techniques such as Dynamic Light Scattering (DLS), Transmission Electron Microscopy (TEM), and Zeta potential analysis. Results indicated that the optimal lecithin concentration was 1:40 (w/v), with encapsulation efficiencies for the active compounds ADE reaching 73.3 ± 1.5% and COR reaching 76.0 ± 5.9%. The optimal homogenization power was found to be 12,000 rpm, with a homogenization time of 10 minutes. The resulting nano liposome system achieved an average particle size of 128.3 ± 4.2 nm, with a Zeta potential of -24.5 mV. The findings of this study highlight the potential for diversifying products derived from Cordyceps militaris to enhance the value of this precious medicinal mushroom.

PRELIMINARY PHYTOCHEMICAL SCREENING AND ANTIOXIDANT PROPERTIES OF LINOSTOMA DECANDRUM

2025-06-30T08:07:12+00:00

Linostoma decandrum is a rare species, and this study is the first to report its phytochemical screening and antioxidant properties. As a result, the ethanol extracts isolated from the leaves and stems of this plant contain many bioactive components such as phenol, tannin, flavonoid, alkaloid, saponin, coumarin, terpenoid, and steroid. The leaves extract includes the total flavonoid, polyphenol, and triterpene contents of 98.06 mg QE/g DW, 43.28 mg GAE/g DW, and 6.35 mg OAE/g DW, respectively. In comparison, 16.90 mg QE/g DW, 26.03 mg GAE/g DW, and 4.51 OAE/g DW were the total flavonoid, polyphenol, and triterpene contents in the stem extract. The leaves and stem extract showed the DPPH radical-scavenging activities with IC₅₀ values of 0.45 and 0.68 mg/mL, respectively.

REMOVAL OF METHYLENE BLUE FROM AQUEOUS SOLUTION USING TiO2/SiO2/CMC PHOTOCATALYTIC COMPOSITE MATERIALS

2025-03-10T03:11:24+00:00

In this study, the composite material made from TiO₂, SiO₂, and CMC was synthesized using the sol-gel method. The structure of the material was characterized by various techniques, including X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), energy-dispersive spectroscopy (EDS), scanning electron microscopy (SEM), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), and dynamic light scattering (DLS). The results indicated that the synthesized TiO₂/SiO₂/CMC material had a spherical shape with a fairly uniform size distribution in the range of 90–100 nm.The applicability of the TiO₂/SiO₂ and TiO₂-SiO₂/CMC composite materials for degrading Methylene Blue under both illuminated and non-illuminated conditions was evaluated using the UV-Vis method. The results showed that, with a material mass materials of 0.05 g and an initial dye concentration (C_MB) below 20 ppm, the dye was completely degraded. Furthermore, for CMB concentrations in the range of 100–200 ppm, with m= 0.1–0.2 g and t = 60 minutes under illumination, the degradation efficiency reached 97%, whereas under non-illuminated conditions, it was 93%. For the TiO₂/SiO₂ material, the corresponding values were 92% and 87%, respectively.Thus, it can be observed that under the same experimental conditions, the TiO₂/SiO₂ composite with a CMC coating exhibited better dye degradation performance than the TiO₂/SiO₂ composite, both under illuminated and non-illuminated conditions. Additionally, under illumination, the degradation efficiency increased by 8–10% compared to non-illuminated conditions. The kinetics of the degradation reaction were studied based on the Langmuir-Hinshelwood model.

INITIAL STUDY ON EFFECT OF SEAWEED EXTRACT FROM Porphyra vietamensis ON Brassica juncea (L.) Czern. et Coss. AND Amaranthus tricolor

2025-06-30T07:01:20+00:00

Seaweed extracts have been increasingly studied for their potential in foliar fertilizer production due to their ability to promote plant growth. This study initially investigated the effect of extracts from Porphyra vietamensis, obtained using potassium hydroxide solution, on the growth of Brassica juncea (L.) Czern. et Coss. and Amaranthus tricolor. The experiment for each plant species included four treatments: water spray (control), and foliar application of seaweed extract at doses of 6 ml (SE06), 9 ml (SE09), and 12 ml (SE12). The results showed that seaweed extract positively impacted plant height, leaf color (SPAD value), and biomass, particularly at appropriate doses. Plant height, SPAD value, and biomass of Brassica juncea (L.) Czern. et Coss. were significantly higher in the 12 ml seaweed extract treatment compared to the control (water spray). Similarly, plant height, SPAD value, and biomass of Amaranthus tricolor were also higher in the 6 ml and 9 ml seaweed extract treatments compared to the water spray control. This study provides a foundation for developing foliar fertilizers from seaweed extract using potassium hydroxide as the solvent and suggests further research into the active compounds in the extract for specialized applications for different plant species.