Kasem Bundit Engineering Journal

ปัจจัยที่ส่งผลต่อความตั้งใจในพฤติกรรมของคนไทยในการใช้แพลตฟอร์มสั่งอาหารออนไลน์

ชิดชนก อินทอง — 2025-04-28

From the current situation of consumers who use food ordering services via the Food Delivery platform after the COVID-19 pandemic, it was found that consumer behavior has changed. This research continuously studies the relationship between indicators related to behavioral intention to order food via the Grab Food platform in Thailand. The research instrument is a questionnaire with 660 respondents. The purpose of the study is to study the indicators affecting the intention to continuously order food via the Food Delivery platform in Thailand using the structural equation model. The analysis of the influence data on the behavioral intention to continuously order food via the Grab Food platform found that performance expectancy, effort expectancy, facilitating condition, habit, and price value for money affect the behavioral intention to continuously order food via the Grab Food platform of users in a statistically significant manner at 0.05. The results of the causal model analysis of the factors influencing the intention to order food online.

PLANT LAYOUT COMPARATIVE ANALYSIS: A CASE STUDY OF CARTON PRODUCT

Wirunpuch Prommachan — 2025-04-28

This research aims to investigate and compare the layout of a carton manufacturing plant in the production process to increase productivity, reduce production costs, and minimize the movement time of workers and materials. The study utilizes the Systematic Layout Planning (SLP) method, starting by identifying issues through an experiment (4M) such as Methods, Machinery, Man, and Materials to understand their compatibility and the characteristics of the production process. The subsequent steps involve studying the paper box manufacturing process by analyzing the time and distance used in production. Subsequently, the research applies the SLP method, using Flow Process Charts and Relationship Charts, to design a new plant layout. This layout is then compared with the existing one. The relationship and mutual benefits between each department, which in the traditional layout lacked design based on proper facility layout principles, resulted in adjacent departments that might not have any relationship. However, the newly designed layout ensures that adjacent departments can mutually benefit from one another. In the traditional layout, the distance was 42.99 meters, while the proposed layout reduced the distance to 40.04 meters, representing a 6.86 percent reduction. Regarding time, the traditional layout required 143.846 seconds, whereas the proposed layout reduced the time to 126.189 seconds, a 12.27 percent decrease.

รูปแบบการออกแบบที่เหมาะสมที่สุดสำหรับโครงถักหลังคาเหล็ก

พันธนะ จิวาลักษณ์ — 2025-04-28

This paper presented an optimum pattern of four most popular roof trusses and the lightest weight of the standard truss. The designed structure maintained strength and safety under the limit states of standard steel structural design in accordance with the Engineering Institute of Thailand standards 1015-40 by using the Allowable Stress Design (ASD) method. In this study the height of truss was used as the parameter for making results convergent to the optimum point, and resulting in reduction of the structure's weight. Results from the study showed that the lightest truss pattern was the fan truss, and the weight of the truss at the optimal point was reduced from standard pattern by 29.3%. Therefore the study of optimum pattern for steel roof truss design might offer an alternative outcome for lower the cost of construction.

THERMAL PERFORMANCE AND ECONOMIC ANALYSIS OF THE HEAT PUMP DRYER

Phiched Thanin — 2025-04-28

This work presents the thermal performance and economic perspectives of a high temperature heat pump dryer. The optimal design under the thermodynamic and computational fluid dynamics (CFD) methods are used to develop the prototype heat pump system. A drying chamber of 0.94 m³ is supplied heat by a 3.2 kW R-134a heat pump. Gymnema tea is used to evaluate the thermal performance at a drying temperature of 45-60 ^oC. The optimal data are found under the testing conditions of an operating time of 240 minutes, a moisture content of 60% Wet-basis, a drying rate of 1.20 k_gw/(kg_G×min), and a specific consumption of 3.71 kWh/kg_G. Drying efficiency, energy efficiency ratio (EER), and heating coefficient of performance (COP_H) are approximately 71.56%, 2.42 kW_th/kW_e, and 5.37 respectively. Economic results are a payback period of 1.02 years and an internal rate return of 49.9%.

การจัดการจราจรบริเวณจุดตัดกรณีศึกษาโครงการรถไฟฟ้ารางเบาจังหวัดขอนแก่นโดยประยุกต์ใช้แบบจำลองระดับจุลภาคและอากาศยานไร้คนขับ

ทรงพล ทรงแสงฤทธิ์ — 2025-04-28

The Khon Kaen Light Rail Transit (LRT) system is designed to operate on median lanes to minimize conflicts with other vehicles. However, intersections remain critical conflict points. This study aims to propose traffic lane redesigns, the addition of new intersections, and the application of Transit Signal Priority (TSP) to mitigate intersection conflicts. UAVs were employed to collect traffic volume and physical data, while a micro-level traffic simulation model was used to analyze four scenarios: (1) no project implementation, (2) LRT with fixed-time traffic signals, (3) LRT with intersection improvements and fixed-time signals, and (4) LRT with intersection improvements and TSP. Results for 2026 show that Scenario (1) yields the best outcome, as current road capacity is sufficient, and LRT adoption is low. By 2046, Scenario (4) is most effective due to increased traffic and the availability of public transit as an alternative. TSP allows LRT and main road vehicles to pass through intersections simultaneously, reducing delays. The redesigned lanes and new intersections also significantly cut travel time and congestion. Theoretical/Policy Implications: This research provides a framework for managing conflict points, aligning traffic systems, and improving connectivity

การศึกษาองค์ประกอบและกระบวนการผลิตน้ำมันมินต์โดยใช้เครื่องกลั่นไฟฟ้าประหยัดพลังงานบุผนังเตาฉนวนด้วยเซรามิกไฟเบอร์

สุพัตรา บุตรเสรีชัย — 2025-04-28

This research aims to design and construct an energy-saving electric distiller with a ceramic fiber insulated furnace wall using 1,800-watt electric coil and an electrical heating system. The research results are divided into 2 parts: 1) The results of an energy-saving electric distiller covered with ceramic fiber insulation compared to heating with a cooking gas stove to distill water using the steam distillation method. 2) The results of an energy-saving electric distiller covered with ceramic fiber insulation compared to heating with a cooking gas stove to distill mint essential oil using the steam distillation method. 3) Analysis of various properties of products obtained from mint processing using an energy-saving electric distiller found that the results of an energy-saving electric distiller covered with ceramic fiber insulation compared to heating with a cooking gas stove to distill water and mint leaves using the steam distillation method took similar distillation times. The electricity cost for using the research prototype is only 11.67 to 37.82 baht, which has a lower energy cost than distillation by heating with LPG cooking gas by 4 times, and in the distillation of essential oil from mint leaves with an energy-saving electric distiller covered with ceramic fiber insulation, compared to heating with cooking gas the values are similar. The density of the oil obtained in the production process of the prototype from this research and the LPG cooking gas stove are also close to each other. The average density of mint oil obtained is 0.902 grams per milliliter, but the cost of electricity or fuel used in distillation by the prototype is 4 times lower than the stove that heats with cooking gas, but the mint oil obtained has similar properties. The top 5 chemical components of mint oil are Water, L-menthone, Methyl acetate, Menthol and Alpha-pinene, and have a similar %Match. Therefore, the mint oil production process with an energy-saving electric distillation machine covered with ceramic fiber insulation is suitable to be used as a tool for producing mint oil or distilling other desired substances as an alternative in selecting tools that reduce energy consumption.

การออกแบบและพัฒนาผลิตภัณฑ์ชุดโต๊ะ-เก้าอี้อเนกประสงค์สำหรับผู้สูงอายุโดยการประยุกต์ใช้วิธีการแปลงหน้าที่เชิงคุณภาพ

ธยา ภิรมย์ — 2025-04-28

The increasing elderly population has led to a growing demand for furniture designed to enhance their quality of life. This research aims to design and develop a multifunctional table and chair set for the elderly by applying the Quality Function Deployment (QFD) technique. The study began with an investigation of the daily activities of the elderly, followed by an analysis of customer preferences regarding multifunctional furniture. A questionnaire was developed to assess the importance of various customer needs, which were then used as input data for QFD analysis. The analysis was conducted using two matrices: (1) a product planning matrix, which translates customer requirements into technical specifications, and (2) a design transformation matrix, which identifies the correlation between design elements and pinpoints weaknesses in sub-assemblies requiring further refinement. The research results show that the newly developed product has improved design, quality, materials, functionality, and cost-effectiveness. A prototype was subsequently evaluated by three groups: (1) potential buyers of multifunctional furniture for the elderly, (2) manufacturers, and (3) rubberwood furniture users. The findings indicate that customers rated modernity of form and structure as the most satisfying factor, with an average satisfaction score of 4.59. Additionally, functionality and versatility ranked second, receiving an average satisfaction score of 4.53. The research demonstrates that the designed products can effectively meet the needs of their users.

การวิเคราะห์ผลการออกแบบหม้อแปลงจำหน่ายเชิงเศรษฐศาสตร์ให้มีต้นทุนวัสดุต่ำและมีความสูญเสียที่เหมาะสม

บุญเลิศ สื่อเฉย — 2025-04-28

This research presents an analysis of the design of transformers used in distribution systems to minimize material costs, achieve acceptable loss values, and comply with regulations. The research process involves designing the transformer while considering loss values and comparing the costs of key materials. The study focuses on transformer sizes commonly used in the industrial sector and installed in the distribution systems of the Provincial Electricity Authority (PEA). The selected transformer 3 Phase 50 Hz 22000-416/240 V Dyn11 sizes are 250 kVA and 500 kVA, in accordance with the new regulations announced by the electricity authority. The results from the design analysis can serve as guidelines for improving transformer designs to reduce costs, increase efficiency, and ensure that loss values meet regulatory requirements. Additionally, it provides a good basis for decision-making when selecting transformers with low loss values.

การบำบัดน้ำเสียโรงพยาบาลที่มีการปนเปื้อนยาปฏิชีวนะโดยระบบถังปฏิกรณ์ชีวภาพเมมเบรน

นิติวิศว์ แตงไทย — 2025-04-28

This research investigated the efficiency of antibiotic removal from hospital wastewater using a membrane bioreactor system. The system was operated with a hydraulic retention time of 3 hours, comparing microbial sludge concentrations of 4 g/L and 6 g/L. The system was initiated once the microbial sludge reached a stable treatment state, with each experiment running for approximately 60 days. The results showed that a higher microbial sludge concentration (6 g/L) exhibited superior antibiotic removal efficiency compared to a concentration of 4 g/L. At the concentration of 4 g/L, the system achieved 100% removal of lincomycin and trimethoprim, while clarithromycin, ciprofloxacin, and norfloxacin removal efficiencies ranged between 17.0% and 57.0%. Increasing the microbial sludge concentration to 6 g/L resulted in 100% removal of lincomycin, erythromycin, and trimethoprim, while the removal efficiencies for norfloxacin, ofloxacin, levofloxacin, and doxycycline ranged between 42.0% and 53.3%. However, the system was unable to eliminate ampicillin and sulfamethoxazole at both sludge concentrations (4 and 6 g/L). These findings indicate that microbial sludge concentration significantly influences antibiotic removal efficiency and can be utilized to optimize hospital wastewater treatment systems for improved performance.