Journal of Science and Technology - IUH

EXPLORING THE IMPACT OF MULTISENSORY MARKETING ON RETURN INTENTION TO A COFFEE SHOP IN HO CHI MINH CITY: THE MEDIATING ROLE OF POSITIVE EMOTIONS

2025-03-13T06:39:37+00:00

The study aims to explore how multisensory marketing influences customers' intentions to revisit coffee shop chains in Ho Chi Minh City, mainly focusing on the mediating role of positive emotions. Research data were collected through a survey of 329 customers who had previously experienced services at various coffee shop chains in the city. This was done using direct questionnaires and online surveys, employing a convenience sampling method. The findings indicate that multisensory marketing positively affects customers' intentions to return. Furthermore, positive emotions partially mediate the relationship between multisensory marketing and customers' intentions to revisit. This study contributes a new perspective on the interplay between multisensory marketing, positive emotions, and customers' revisit intentions. The results not only provide empirical evidence for the effectiveness of multisensory marketing but also offer insights for developing more effective personalized marketing strategies for coffee shop chains in Ho Chi Minh City.

FACTORS AFFECTING CUSTOMERS’ REVISIT INTENTION AT VIRTUAL EVENTS IN HO CHI MINH CITY

2024-10-23T15:54:07+00:00

This study aims to identify and analyze the factors influencing customers' revisit intention at virtual events in Ho Chi Minh City. The research applied both qualitative and quantitative methods. The author relied on the C-TAM-TPB, the IS Success Model and Social Presence Theory as well as previous related research materials to build the research model. The author collected and processed 466 observations after surveying respondents who were customers who had participated in virtual events by sending online surveys. The results of the study show that there are three factors influencing the intention to revisit virtual events, including: Virtual event quality; Virtual event experience; Satisfaction with virtual events. Based on the quantitative analysis results, the author proposes managerial implications to enhance the ability to attract customers' interest in revisit virtual events and provide valuable recommendations for the event industry in Ho Chi Minh City.

THE IMPACT OF PAST BEHAVIOUR AND HERDING EFFECT ON INVESTMENT DECISIONS: AN ANALYSIS OF INVESTOR BEHAVIOUR IN HO CHI MINH CITY

2026-01-15T11:24:59+00:00

The Vietnamese stock market, as an emerging market, has garnered significant attention due to its strong growth potential. Research on individual investment behaviour is particularly relevant, as investment decisions are not only influenced by financial models and portfolio structures but also by psychological factors such as the herding effect and past behavioural patterns. This study employs PLS-SEM to examine the relationship between past behaviour, herding behaviour, and investment decisions. Additionally, it explores the mediating role of herding behaviour in the relationship between past behaviour and investment decisions among investors in the Vietnamese stock market. Based on survey data from 255 stock investors residing in Ho Chi Minh City, Vietnam, the findings indicate that past behaviour exerts the strongest influence on investment decisions among the studied factors, suggesting that investors tend to rely heavily on prior experiences when making investment choices. Moreover, past experiences not only have a direct impact on investment decisions but also an indirect effect through herding tendencies. This finding reinforces the notion that investment decisions are not solely rational but are also shaped by individual and social behavioural factors. Raising awareness of behavioural biases and promoting financial education are essential in helping investors make more informed decisions and mitigate financial risks in the future.

THE IMPACT OF GREEN HUMAN RESOURCE MANAGEMENT ON EMPLOYEES'S TURNOVER INTENTION IN HO CHI MINH CITY: THE MEDIATING ROLE OF JOB SATISFACTION

2026-01-15T11:48:56+00:00

Green human resource management (GHRM) is currently a major concern in businesses worldwide because it affects the functions of human resource management and employee behavior. Understanding the impact of GHRM on the employee’s turnover intention and testing the mediating role of job satisfaction is essential. The research sample includes 300 employees working in businesses in Ho Chi Minh City and the study was conducted with five factors: (1) Green recruitment; (2) Green training; (3) Green performance; (4) Green rewards; (5) Green participation. The study used the PLS-SEM tool for data processing and model evaluation. The results showed that green recruitment, green training, green performance, green rewards, and green participation all have a negative impact on the turnover intention. Furthermore, job satisfaction has a mediating impact on the relationship between GHRM and employee’s turnover intention. This helps businesses to refer to and develop appropriate policies to minimize turnover rates and promote sustainable development.

ANALYSIS OF THE INFLUENCE OF MATERIALS ON THE DURABILITY CHARACTERISTICS OF BRAKE DISCS ON VEHICLE

2026-01-14T12:32:28+00:00

Currently, most passenger cars often use disc brakes because this mechanism brings safety and fast operation. During the movement of the vehicle, the brake disc operates continuously, so it is easy to change the durability compared to the original, so manufacturers need to choose the appropriate material to make the brake disc at a reasonable price. The finite element method is applied based on Ansys to analyze the stress and deformation of hydraulic brake discs for passenger cars corresponding to materials. The 3D analytical model of the disc is built using SolidWorks software. The simulation shows that the structural steel with stress and strain of 48.778 MPa and 0.078082 mm respectively is suitable for making brake discs. This result serves the research work to improve brake discs or for manufacturers of automobile brake systems.

OPTIMIZATION OF MONOCOQUE BUS FRAME FOR ROLLOVER CRASHWORTHINESS

2026-01-14T12:50:10+00:00

This study proposes an improved design method for monocoque bus frames under rollover conditions according to the ECE R66 standard by reinforcing the frame with composite ribs made of S2 glass fibers and epoxy. The effectiveness of the method is validated through finite element analysis (FEA) simulations using Hypermesh and the LS-DYNA solver. The results demonstrate that the bus structure reinforced with composite ribs maintains a residual space, meeting the ECE R66 safety requirements. Moreover, the vehicle's weight remains nearly unchanged, providing an optimal solution for sustainable bus frame design. This research offers a pathway toward developing safer, more sustainable, and environmentally friendly public transportation vehicles.

STUDY ON PRODUCING LIQUID CO₂ FROM BIOMASS-FIRED BOILERS AS A REPLACEMENT FOR FOSSIL FUELS

2026-01-15T08:49:51+00:00

Liquid carbon dioxide (CO₂) is widely used in industry and daily life. CO₂ is primarily produced from fermentation processes (such as in beer, wine, soft drink, and ethanol production) or from the direct combustion of diesel fuel (DO), natural gas (NG), nitrogen fertilizer production, and from the calcination of limestone (CaCO₃). Currently, in Vietnam, the supply of CO₂ to the market does not meet actual demand. To help increase supply, the research team proposes an additional solution for producing liquid CO₂ from biomass-fired boilers. The main result presented in this paper is the design and fabrication of an industrial-scale liquid CO₂ production system from the flue gas of a biomass-fired boiler. The CO₂ recovery system has a capacity of 50 tons of liquid CO₂ per day and night. Flue gas flow into the system is 22,000–25,000 m³/h, with an inlet gas temperature of 42–45°C. The MEA flow rate is 65–70 m³/h, the absorber column operates at 42–45°C, and the stripper column at 115–125°C. Steam is supplied at a pressure of 3 bar(a) and a flow rate of 6–7 tons/hour. The amount of steam consumed per ton of CO₂ produced is approximately 2.8–3.2 tons. The system meets the criteria for “green” CO₂ production, helps reduce greenhouse gas emissions, and is capable of meeting the future demand for liquid CO₂. This system can be applied to large-scale biomass-fired boilers.

SYNTHESIS OF TiO₂/ZnO/HAp COMPOSITE MATERIAL AND ITS APPLICATION IN ADSORPTION OF REACTIVE BLUE DYE

2026-01-14T10:54:57+00:00

In this study, the TiO₂-ZnO/HAp composite materials were successfully synthesized using the co-precipitation method, Ti⁴⁺:Zn²⁺:Ca²⁺ ratio 1:1:6. The structural materials characteristics and surface morphology were determined through modern physicochemical techniques, including X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results indicate a particle size of 10 nm. The adsorption of the Reactive Blue dye by synthesized composite material was experimentally evaluated using UV-Vis spectroscopy. The findings demonstrate that, TiO₂-ZnO/HAp composite material exhibits significantly enhanced dye adsorption capacity compared with separate materials (TiO₂, ZnO, and HAp). Under optimized conditions (40 ppm Blue 21 dye, 10-minute adsorption time, and 0,1 g of material), the TiO₂/ZnO/HAp composite demonstrated 93% adsorption efficiency. This significantly outperformed TiO₂ and ZnO individually (8-10% efficiency), while showing comparable performance to HAp (85%). An increase in adsorption time further enhanced the dye removal efficiency of the composites, raising it from 93% to 98.5%. A Langmuir isotherm model revealed a maximum adsorption capacity of 42.3 mg/g for the TiO₂-ZnO/HAp composite with reactive Blue dye.

NDVI TRENDS IN DAK NONG PROVINCE

2026-01-14T11:26:17+00:00

This study aims to analyze the vegetation cover trend of Dak Nong province based on the Normalized Difference Vegetation Index (NDVI). NDVI data were obtained from MODIS (Moderate Resolution Imaging Spectroradiometer) and were collected from 2000-2023. This data has a resolution of 463 m x 463 m. The methods used in the study are trend analysis and change point detection. Mann-Kendall test and Sen's slope estimator were used in trend analysis. The Pettitt method was used to detect the change points. The analysis results showed that most of the grid cells had a decreasing trend of NDVI, of which 39% had a significant decrease at the 0,05 significance level. The decreasing trend of NDVI is different between land use types, in which the crop group has a decrease of about 2,6 times higher than the forest group. The analysis results show that the change point of NDVI and the area of forest and perennial trees usually appeared in 2013. The rapid decline of forests, especially in the period 2000-2013, which was the period before the change point, caused a sharp decline in NDVI in this region. NDVI is a measure of vegetation health and land use change. The area with “Very Strongly Degraded” NDVI is 30%, indicating high vulnerability to human-caused damage to vegetation in this region.

SYNTHESIS OF NANOSILICA FROM AGRICULTURAL WASTE SUGAR BAGASS AND PREPARATION OF NANOSILICA COLLAGEN FOR COSMETIC

2026-01-14T11:52:22+00:00

Vietnam is a nation renowned for its agricultural production, which generates a vast quantity of agricultural waste annually. Improper and untimely management of these agricultural byproducts can lead to detrimental effects on the environment and public health. Notably, agricultural wastes such as rice husks, sugarcane bagasse, and corncobs are rich in silica, presenting an opportunity to utilize these materials for the synthesis of nanosilica. Nanosilica is a versatile material with extensive applications in diverse fields, including drug delivery, cosmetics, construction material additives, and environmental remediation. This research focuses on using sugarcane bagasse, an agricultural waste, for the production of nanosilica, and then prepares nanosilica collagen used in cosmetic ingredients. Scanning Electron Microscopy (SEM) results reveal that the synthesized nanosilica particles are spherical with an average size ranging from approximately 25 to 30 nm. Collagen-modified nanosilica, the product of the modification process, also exhibits a spherical morphology with a slightly larger average size, approximately 30 to 40 nm. Analysis of N₂ adsorption-desorption isotherms (BET) indicates that the nanosilica material possesses a stable porous structure and exhibits good absorption capacity, rendering it suitable for cosmetic applications by promoting a dry and smooth product texture, enhancing the adsorption of active ingredients within the cosmetic formulation, and facilitating efficient release upon application to the skin.

DOSE-DEPENDENT GASTROPROTECTIVE AND IMMUNOMODULATORY EFFECTS OF Oldenlandia capitellata Kuntze LEAF EXTRACT IN AN INDOMETHACIN-INDUCED MURINE MODEL

2026-01-14T12:04:31+00:00

Objectives: This study aimed to evaluate the dose-response correlation between Oldenlandia capitellata Kuntze leaf extract (EE-OC) and its gastroprotective effects in an indomethacin-induced murine model, with a specific focus on the relationship between extract dosage and gastric, hematological, and immunological parameters. Materials and Methods: Male Swiss albino mice were randomly assigned to six groups: normal control, indomethacin-induced model, omeprazole-treated group (20 mg/kg), and three groups receiving EE-OC at doses of 100, 200, and 300 mg/kg. Treatments were administered orally for seven consecutive days. Key parameters measured included gastric pH, free and total acidity, ulcer index, red and white blood cell counts, erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), and cytokine levels (TNF-α, IL-1β, IL-10). Pearson correlation analysis was employed to assess dose–response relationships. Results: EE-OC demonstrated dose-dependent effects, including increased gastric pH (r = +0.999, p = 0.030), reduced total acidity (r = -0.995, p = 0.047), and lower ulcer index (r = -0.993, p = 0.073), with ulcer inhibition reaching 61.1% at 300 mg/kg (p = 0.041). Hematological improvements included elevated RBC counts (r = +0.994, p = 0.069) and significantly reduced CRP levels (r = –1.000, p = 0.0077). EE-OC also downregulated IL-1β (r = -0.998, p = 0.0408) and upregulated IL-10 (r = +0.999, p = 0.0334), indicating a strong immunomodulatory effect. Conclusion: These findings confirm a dose-response correlation between EE-OC and gastroprotection, highlighting its potential as a multi-target agent acting via gastric acidity reduction and immunomodulation in NSAID-induced gastric injury.

A NEW SOLAR DRIVE SYSTEM APPLIED TO FOUR-SWITCH THREE-PHASE INVERTERS

2026-01-14T13:07:55+00:00

To reduce the size and cost of the electric drive systems, this paper proposes an electric drive system which is supplied by solar photovoltaics based on a 3-phase 4-switch inverter technology applying 2 hysteresis current controllers. Firstly, the boost dc–dc converter model is proposed and the maximum power point is enforced by adjusting the duty cycle ratio of the boost converter using the incremental conductance method to extract the optimal power from the solar photovoltaics discussed in detail. Secondly, the vector controller for the permanent magnet synchronous motor with pump load is controlled based on power output of the solar photovoltaics. Finally, the proposed system is simulated by MATLAB/Simulink software and the control response is verified through the simulation results.

A DESIGN OF MULTI-FUNCTION SENSOR FOR HIGH-TECH SHRIMP FARM

2026-01-15T09:02:16+00:00

High-tech shrimp farming techniques have developed strongly and brought high potential in terms of economic efficiency for shrimp farming households in coastal areas in the Mekong Delta region. High-tech shrimp farming models require strict control of water environment parameters while equipping shrimp ponds with water environment sensors is expensive and difficult to maintain. This paper proposes an effective solution for monitoring the environmental parameters of shrimp pond water by using a handheld online multi-function sensor. From there, an effective design was proposed for a multi-function sensor to monitor the shrimp pond water environment such as dissolved oxygen, PH, oxidation reduction potential, temperature, and leftover feed at the bottom of the pond. The proposed design model is compact, portable, and connected with an IoT cloud so that farmers can not only easily move, measure and monitor pond water environmental parameters online via smartphone app, but also easily operate and maintain sensor probes. By using only one multi-function sensor to measure all shrimp ponds, the cost of investing in environmental monitoring equipment for shrimp farms has reduced many times compared to the current one. Therefore, the proposed multi-function sensor has high economic efficiency, durability, and stability. It is also very convenient for farmers and easy to implement practical applications.

INNOVATING UNIVERSITY TEACHING METHODS THROUGH EXPERIENTIAL AND COMMUNITY-BASED LEARNING IN CONTEMPORARY VIETNAM

2026-01-15T12:12:41+00:00

The article analyzes recent innovations in university teaching in Vietnam toward experiential learning integrated with community service. Methodologically, the study combines a literature review with a comparative case analysis of four public universities (IUH, VLU, HUTECH, CTU), drawing on student surveys, empirical studies, and reports on service-learning courses. The findings identify four main models: credit-bearing community service-learning (CSL) modules, EPICS-style engineering design projects, short-term international service-learning programs, and summer camps or other seasonal projects. Among these, credit-bearing course modules designed under the EPICS framework or its equivalents demonstrate clear advantages in terms of learning outcomes, soft-skill development, social responsibility, and degree of institutionalization. The study further highlights barriers related to the regulatory framework, resource constraints, evaluation tools, and cross-sector coordination. This article contributes a classification framework, a set of evaluation criteria, and a package of governance–policy solutions to support the sustainable scaling of experiential, community-engaged learning models in Vietnamese higher education.

DESIGN SOLUTIONS FOR WOMEN’S SHIRTS USING OPTITEX 3D SOFTWARE: AN EFFECTIVE APPROACH FOR GARMENT ENTERPRISES

2026-01-15T12:28:14+00:00

3D fashion design is becoming an inevitable trend in the digital transformation process of the garment industry. The study proposes the application of Optitex 3D in women’s shirt design to test the efficiency in terms of time, cost, and technical accuracy compared to traditional methods. Through user surveys and simulation experiments, the study shows that 3D technology can optimize product development and support small and medium enterprises to improve their competitiveness. The results provide a suitable approach for the garment industry in the current digital context.