https://ph02.tci-thaijo.org/index.php/sej <p>The Srinakharinwirot University Engineering Journal (SEJ) publishes both research and academic papers, reporting theoretical and experimental advances in all areas of engineering. All submitted manuscripts must be reviewed by at least 3 expert reviewers (Peer-Review) via the double-blinded review system. The frequency of publishing is 2 issues per year, namely No. 1 (January - June), No. 2 (July - December). The ISSN is 2774-0269 (Online)</p> <p><strong>Page Charge Policy</strong></p> <p>Payment of page charges for this journal is not a prerequisite for publication.</p> Faculty of Engineering, Srinakharinwirot University en-US Srinakharinwirot University Engineering Journal 2774-0269 <p>Copyright belongs to Srinakharinwirot University Engineering Journal</p> https://ph02.tci-thaijo.org/index.php/sej/article/view/253638 <p>This research investigates and compares variations in grounding electrode characteristics affecting soil resistance values, utilizing geological data from Buriram Province. The study area is characterized by plateaus and volcanic terrain. Three distinct areas with varying soil conditions are consists: Prakhon Chai District, Mueang Buriram District, and Khu Mueang District, were selected for experimentation to ascertain soil resistance values correlated with geological features. The study involved measuring the resistance of rods and plates of different dimensions. Results indicate that employing a copper bar ground stake with a diameter of 14.20 millimeters and a length of 240 centimeters yielded the lowest soil resistance values in Prakhon Chai District is 6.43 ohms, followed by Mueang Buriram District is 7.18 ohms, and the highest value was observed in Khu Mueang District is 353 ohms. Similarly, burying a copper sheet is 30x30 square centimeters to a depth of 150 centimeters revealed varying soil resistivity values: Prakhon Chai District is 10.3 ohms, Mueang Buriram District is 12.5 ohms, and Khu Mueang District is 368 ohms. Soil classification tests identified sandy clay soil with high soil moisture content in Prakhon Chai District and Mueang Buriram District, resulting in low soil resistance and efficient electric current conduction. Conversely, Khu Mueang District exhibited sandy soil mixed with silt, facilitating easy water permeation and consequently yielding the highest soil resistance value.</p> Dusit Uthitsunthorn Cheellawad Vimuttisoongviriya Copyright (c) 2025 Srinakharinwirot University Engineering Journal https://creativecommons.org/licenses/by-nc-nd/4.0 2025-04-10 2025-04-10 21 1 1 15 https://ph02.tci-thaijo.org/index.php/sej/article/view/254676 <p>This research aims to find ways to smooth the flow of the production line, which produces 11 product groups of gears that involve both manual labor and semi-automatic machinery and have the production line with one-piece flow and job shop configurations. Currently, this production line cannot meet customer demand. Therefore, computer simulation was used to assist in the analysis of the improvement methods. The improvement of the gear production line involved adjusting batch sizes, prioritizing jobs with the Shortest Processing Time (SPT) considering the bottleneck stations, increasing resources, and employing various methods together. Experimental results showed that the most effective methods were adjusting batch sizes and prioritizing jobs with SPT together, resulting in a 37.30% increase in gear production rate, a 15.42% and 15.41% increase in employee and machine utilizations, leading to an improvement in production line efficiency 6.86%.</p> Busaba Pruksaphanrat Keeradee Kongcharoen Prakaikan Suksamai Copyright (c) 2025 Srinakharinwirot University Engineering Journal https://creativecommons.org/licenses/by-nc-nd/4.0 2025-04-10 2025-04-10 21 1 16 27