Journal of Science & Technology University of Economics -Technology for Industries

OPTIMIZATION OF TECHNOLOGICAL PARAMETERS IN THE DRILLING PROCESS OF A6061 ALUMINUM USING THE FINITE ELEMENT METHOD

Lê Huỳnh Đức, Lương Quốc Việt, Phạm Văn Mạnh — Fri, 23 Jan 2026 00:00:00 +0700

Drilling A6061 aluminum alloy is a common operation in mechanical manufacturing but often encounters problems such as large heat generation, chip adhesion, dimensional deviation and rapid tool wear when selecting inappropriate technological parameters. This study uses the finite element method (FEM) to simulate the A6061 drilling process using Abaqus software. The workpiece material model is built according to Johnson-Cook standards, 3D drilling tools are set up with variable boundary conditions and technological parameters including cutting speed, feed rate and drilling depth. Simulation results allow analysis of chip formation, stress-strain distribution, and at the same time determine the relationship between technological parameters and cutting force and quality of drilled holes. On that basis, the study proposes an optimal set of drilling parameters to reduce cutting force, limit tool wear and improve machining accuracy, contributing to increased productivity and quality in mechanical manufacturing

DESIGN AND FABRICATION OF A HYDROFORMING DIE SYSTEM FOR MANUFACTURING HOLLOW X-SHAPED JOINT ON THE UNIVERSAL PRESS YH-32

Vũ Đức Quang, Đinh Trường Ninh — Fri, 23 Jan 2026 00:00:00 +0700

This paper presents research findings on the successful design and fabrication of a hydroforming die system for manufacturing hollow X-shaped joint components on the universal press YH-32. The study applies hydroforming technology to form products from tubular blanks with high quality and precision meeting technical requirements, while simultaneously reducing processing time and manufacturing costs, thereby enhancing competitiveness. The research methodology integrates theoretical analysis with 3D modeling using NX software and numerical simulation using Abaqus software to analyze and optimize both the forming process and die structure prior to manufacturing. The results confirm the technological feasibility, enabling production of hollow X-shaped joint that satisfy technical specifications and paving the way for broader application in manufacturing complex machine components. This research holds significant practical value, contributing to the development of Vietnam's metal forming industry

ẢNH HƯỞNG CỦA BÁN KÍNH CHUYỂN TIẾP KHUÔN ĐẾN QUÁ TRÌNH DẬP THỦY TĨNH PHÔI ỐNG PHÂN NHÁNH DẠNG CHỮ U

Trịnh Thị Mai, Trần Vũ Lâm — Fri, 23 Jan 2026 00:00:00 +0700

Hydroforming (HF) is an advanced metal forming technology used to manufacture hollow components with complex geometries, in which the die shape-especially the transition radius-significantly influences material flow and forming quality. Although many studies have examined internal pressure and axial feeding, the effect of the transition radius on the hydroforming of branched tubes has not been clearly clarified.

This study simulates the hydroforming of a U-shaped branched tube made of CDA110 copper using Abaqus/CAE with three transition radius values: Rc = 4 mm, 6 mm, and
8 mm. As Rc increases from 4 mm to 8 mm, the bulge height increases by 12.4%, while the maximum wall thinning decreases by 4.6%. The PEEQ analysis indicates that a larger radius provides a more stable stress distribution and reduces stress concentration.

The results show that Rc = 8 mm is the optimal choice under the investigated conditions, ensuring better die filling and reducing the risk of failure. These findings provide valuable quantitative data for die design and process optimization in tube hydroforming, serving as a foundation for future studies and experimental validation.

DESIGN COMPARISON OF SURFACE-MOUNTED PERMANENT MAGNET SYNCHRONOUS MOTORS WITH INNER AND OUTER ROTOR APPLICATION FOR ELECTRIC VEHICLE

Trần Đức Chuyển, Bùi Hữu Hoàng — Fri, 23 Jan 2026 00:00:00 +0700

The surface-mounted permanent magnet synchronous motor (SPMSM) is one of the electric machines applied widely in the fields of electric vehicles (EVs) and electrical drives and electric drives in industry and civil. There are two types of SPMSM motors, namely inner rotor SPMSM and outer rotor SPMSM. To analyze and calculate the advantages and disadvantages, as well as compare the performance of these two types of motors. This SPMSM research problem presents an analytical model to preliminarily design the main parameters of SPMSM with both inner and outer rotor types. Then, the finite element method is used to simulate, analyze and compare the electromagnetic parameters of the motors. This research result is also the basis for calculation, analysis, design and control for industrial machines and especially for application in the field of electric vehicle motors

RESEARCH ON THE APPLICATION OF FUZZY LOGIC COMBINED WITH IoT INTO WSN SENSOR NETWORK

Ninh Văn Thọ, Bùi Thị Nhi — Fri, 23 Jan 2026 00:00:00 +0700

In this paper, we propose an adaptive dynamic clustering algorithm PMACME for data transmission based on the priority MAC (Media Access Control) protocol PMME (Priority MAC protocol for MultiEvent Wireless Sensor Network) to reduce the risk of collision and delay of packets, route data and form dynamic clusters in WSN (Wireless Sensor Network) using Fuzzy Logic combined with IoTs (Internet of Things). The dynamic clustering algorithm PMACME has the ability to expand the cluster. Determine the selected cluster heads (CH) and the distance between nodes in the cluster is maintained to transmit maximum data without affecting the network parameters. The combination of Fuzzy Logic with IoTs optimizes the selection of cluster heads (CH), determines the cluster size and improves energy efficiency. Simulation results demonstrate that PMACME is superior in balancing energy consumption and improving network lifetime compared to current routing algorithms

DESIGN OF A WIDE-INPUT-RANGE LINEAR VOLTAGE REGULATOR USING 90 nm CMOS TECHNOLOGY

Vũ Ngọc Dân, Nguyễn Cao Chí Hoàng — Fri, 23 Jan 2026 00:00:00 +0700

This study presents the design of a low-dropout linear voltage regulator using 90nm CMOS technology. The design addresses the increasing demand for stable and efficient power supplies capable of operating across a wide input voltage range for mobile applications. The proposed circuit architecture is optimized to achieve high efficiency, robust output voltage stability under wide input voltage variation, and low power consumption. Simulation results validate the effectiveness of the designed circuit. Specifically, the circuit successfully maintains a stable output voltage over a wide input voltage range of 1,9 to 20,5 V. It achieves a low dropout voltage of only 300 mV and demonstrates a fast load transient response while maintaining low quiescent current. These newly found characteristics are suitable for the high efficiency and reliable operation of the system required under variable input conditions

RESEARCH ON THE FABRICATION OF ZnO-Ag/ALGINATE NANOCOMPOSITE AS ANTIBACTERIAL MATERIAL

Fri, 23 Jan 2026 00:00:00 +0700

In this study, ZnO-Ag nanoparticles were successfully synthesized via the co-precipitation method, forming a stable wurtzite structure with uniform hexagonal particles of approximately 20–25 nm. Based on these nanoparticles, ZnO-Ag/alginate nanocomposites were synthesized at different ratios, in which spectroscopic analyses confirmed that the obtained materials retained the characteristic properties of both ZnO-Ag and alginate. In particular, the materials exhibited strong antibacterial activity against E. coli and S. aureus, with inhibition zone diameters reaching the best values of 26 and 30 mm, respectively, within the studied range. These results demonstrate that ZnO-Ag/alginate materials not only possess biocompatibility but also provide outstanding antibacterial capability, opening up prospects for their application in the treatment and disinfection of contaminated water

STUDY ON THE DESIGN OF A HYBRID SOLAR–HYDRO TURBINE POWER GENERATION SYSTEM FOR REMOTE MOUNTAIN REGIONS

Trần Duy Tùng, Trần Văn Thực, Mai Hữu Thuấn — Fri, 23 Jan 2026 00:00:00 +0700

Providing stable electricity to mountainous regions remains a major challenge due to limited grid infrastructure and high investment costs, meanwhile, the potential integration of solar and hydropower resources in Vietnam has not yet been fully exploited. This paper presents the design and evaluation of a hybrid power system comprising a 50 kWp photovoltaic array and a 30 kW mini-hydro turbine, applied in Van Chan district, Yên Bái province. The system leverages the complementary characteristics of the two energy sources (seasonal and diurnal balancing), combined with dual storage (battery and pumped-hydro) and a smart controller to ensure a reliable power supply for 46 households. The results indicate high technical feasibility, reasonable investment costs, and a short payback period, while also demonstrating socio-economic benefits and contributing to the promotion of renewable energy development in remote communities

RESEARCH ON THE APPLICATION OF LEAN MANUFACTURING PHILOSOPHY TO IMPROVE PRODUCTIVITY IN SMALL AND MEDIUM SIZED GARMENT ENTERPRISES

Bùi Thanh Hương, Phạm Thị Quỳnh Trang — Fri, 23 Jan 2026 00:00:00 +0700

In the stituation of the increasingly fierce competition in Vietnam’s Garment Industry, enhancing production efficiency and improving labor productivity have become urgent requirements, particularly for small and medium sized garment enterprises, which often face significant constraints in financial, technological and managerial resources. Effective production management through appropriate line organization and the elimination of waste presents a practical and appropriate approach. Motivated by this reality demand, the research team conducted a study applying the Lean Production tools, combined with sewing line balancing technique to improve facility layout and reorganize the sewing production line at Nhat Hong Garment Factory. The results show that the initiatives contributed to improving the working environment, optimizing labor allocation, and increasing the average productivity from 72% to 80%, while strengthening the enterprise’s competitiveness under limited resource conditions

THЕ ЅTUDУ ОF FАСTОRЅ ІNFLUЕNСІNG THЕ ЅОСІАL RЕЅРОNЅІBІLІTУ ОF RЕTАІLЕRЅ ІN VІЕTNАM

Hoàng Văn Nhất, Nguyễn Thị Hạnh — Fri, 23 Jan 2026 00:00:00 +0700

This study investigates the factors influencing corporate social responsibility (CSR) among retailers in Vietnam, based on a survey of 180 firms and analysis using the PLS-SEM model. The findings reveal that CSR practices of Vietnamese retailers are primarily driven by three statistically significant factors: economic, ethical, and cultural dimensions. In contrast, social and environmental factors do not show significant influence in the empirical context of the study. Based on these results, the study recommends that retailers prioritize strengthening their business foundations in terms of economic performance, ethical values, and organizational culture to enhance the effectiveness of CSR implementation

A STUDY ON CUSTOMER SATISFACTION WITH THE LONG CHAU PHARMACY CHAIN IN NAM DINH CITY

Đỗ Thị Hường — Fri, 23 Jan 2026 00:00:00 +0700

Customer satisfaction is playing an increasingly important role in enhancing the competitive advantage and operational efficiency of pharmaceutical retail enterprises. This study aims to identify the factors that influence customer satisfaction with the Long Châu pharmacy chain in Nam Định City. Data were collected through a survey of 300 customers and analyzed using SPSS 26.0. The quantitative analysis process included reliability testing with Cronbach's Alpha, Exploratory Factor Analysis (EFA), and multiple linear regression. The EFA results identified five distinct factors influencing satisfaction. The regression analysis revealed that all five factors positively and significantly affect customer satisfaction: (1) pharmacist service quality, (2) perceived price, (3) product quality, (4) brand image, and (5) convenience. Among these, pharmacist service quality has the strongest impact. These findings serve as a basis for proposing specific managerial solutions to enhance the customer experience and thereby strengthen the competitive position of the Long Châu pharmacy chain in the local market

FACTORS AFFECTING THE METHOD OF DETERMINING TRAINING SERVICE FEES AT AUTONOMOUS PUBLIC UNIVERSITIES IN VIETNAM

Trần Thị Thắm — Fri, 23 Jan 2026 00:00:00 +0700

Implementing the financial autonomy mechanism for public universities according to the policy of the Party and the State requires the management of training costs based on the effective use of resources to be strengthened to improve the quality of training at schools.So the question is how public universities can calculate correctly and fully the training service fees. The content of the article further clarifies theoretical issues on the method of determining training fees at autonomous public universities and the factors affecting the application of the method of determining training fees in schools. Develop a scale of factors to be used in a model to measure the impact of factors on the level of meeting the training cost information requirements of administrators (the suitability of the cost determination method) to serve as a basis for choosing a suitable training cost determination method for autonomous universities and designing a scale to evaluate the factors of Viet Nam

STRATEGIC DEVELOPMENT OF LISTED FERTILIZER FIRMS IN VIETNAM AMID INTENSIFYING PRICE COMPETITION

Trần Thị Kim Liên — Fri, 23 Jan 2026 00:00:00 +0700

The fertilizer industry plays an essential role in agriculture, the core sector of the Vietnamese economy. However, the industry is facing many challenges such as dependence on imported raw materials, global price fluctuations, trade protection policies and fierce competition from cheap imported products. In this context, listed fertilizer companies are forced to improve their competitiveness, especially in terms of price, to maintain market share and profits. Analysis of financial data for the period 2020–2024 shows a clear differentiation in operating efficiency, thereby proposing solutions to optimize costs and strengthen financial management to improve competitiveness

NANOCHITIN AND ITS POTENTIAL APPLICATION

Nguyễn Thị Chà — Fri, 23 Jan 2026 00:00:00 +0700

Nanochitin, obtained from chitin through nanostructuring processes, exhibits distinct characteristics such as biocompatibility, water dispersibility, and non-toxicity. Owing to these features, it has become a subject of interest in diverse domains including food science, healthcare, agriculture, and environmental applications. This paper discusses how the structural attributes of nanochitin relate to its functionality and reviews a range of studies that have demonstrated its practical uses. By compiling recent research, the article offers insights that may support further exploration and innovation in the use of nanochitin-based materials

THE VEGETABLE GARDEN AND SOLUTIONS FOR SUSTAINABLE SCHOOL ECONOMIC DEVELOPMENT AT THE NATIONAL DEFENSE AND SECURITY EDUCATION CENTER, UNIVERSITY OF ECONOMICS - TECHNOLOGY FOR INDUSTRIES

Phạm Văn Tự — Fri, 23 Jan 2026 00:00:00 +0700

The article presents the model of a self-sufficient garden implemented at the Center for National Defense and Security Education, University of Economics - Technology for Industries, as a practical solution integrating student training activities with internal economic development. By utilizing 1,000 square meters of land to grow vegetables, fruit trees, and herbs, the model has recorded positive outcomes in cost savings, experiential education, and sustainable development orientation. The article provides a detailed analysis of the economic, educational, and organizational benefits, while also proposing solutions for expansion and the potential for replication across the university