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International Journal Science and Technology (IJST)
Published by Asosiasi Dosen Muda Indonesia
ISSN : 28287223     EISSN : 28287045     DOI : https://doi.org/10.56127/ijst.v1i2
Core Subject : Science, Engineering,
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering
International Journal Science and Technology (IJST) is a scientific journal that presents original articles about research knowledge and information or the latest research and development applications in the field of technology. The scope of the IJST Journal covers the fields of Informatics, Mechanical Engineering, Electrical Engineering, Information Systems and Industrial Engineering. This journal is a means of publication and a place to share research and development work in the field of technology.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 132 Documents
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AI-Driven Digital Twin for Energy Optimization in Green Data Centers Oktria, Isni
International Journal Science and Technology Vol. 4 No. 2 (2025): July: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v4i2.2249

Abstract

This study proposes the development of an AI-driven digital twin for data centers aimed at improving energy efficiency, reducing carbon footprint, and enhancing operational performance. The digital twin—a virtual replica of the physical data center—will be equipped with real-time AI algorithms to predict thermal loads, analyze cooling requirements, and automatically adjust operations to minimize energy consumption. This paper explores the integration of AI with digital twin architectures, tests its performance in simulated scenarios, and evaluates potential energy savings as well as contributions to Green IT practices.
Design of Electrical Power Transfer Automation System Between PLN, PLTS and Genset Using Relay Sunarto; Tri Nur Arifin
International Journal Science and Technology Vol. 4 No. 2 (2025): July: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v4i2.2251

Abstract

Electrical system use one single source are often vulnerable to disruptions, especially in area with unstable electricity supply. This study presents the development and implementation of an automation system for seamless power transfer management between three primary sources: PLN, PLTS and Genset. The primary objective of this system are to improve electricity supply, optimize renewable use energy, and reduce operational cost. Relay are used as crucial actuator to automatically switch between power source based on pre-set priority logic. When the PLN power source voltage range from 180.3 to 260.2 volt, the automation system immediately switch to the first backup power source, the PLTS, with a voltage range of 220.2 volt. When the PLN and PLTS voltage are 0 volt, the automation system switch to the second backup power source, the genset, with a voltage range of 220.2 volt. If the PLTS and Genset are 0 volt, the system will return to the primary priority source, the PLN, with a voltage range of 220.2 volt. Simulation test results show that the system is afford of detecting power availability and quality from each power source and automatically transitioning power with a fast response time. The implementation of relay ensures effective isolation and reliable switching control.
The Effect of Light Intensity on Electrical Energy Produced by Polycrystalline Solar Panels Falaqi; Tri Nur Arifin
International Journal Science and Technology Vol. 4 No. 2 (2025): July: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v4i2.2252

Abstract

This study analyzes the effect of sunlight intensity on the electrical energy generated by polycrystalline solar panels. The solar power plant system was designed simply and measurements were taken over three days using a lux meter, thermometer, ampere meter, and power meter. Data were analyzed using SPSS through correlation tests and multiple linear regression. The results show that light intensity (lux) has a dominant influence with an average contribution of 68.2% to electrical power. The maximum power recorded was 76 Watts on May 18, 83.3 Watts on June 1, and 85 Watts on June 27, 2025. Other environmental variables such as panel surface temperature, ambient temperature, and humidity also have an influence but on a smaller scale. In conclusion, light intensity plays a significant role in solar panel performance and is a major factor in solar power plant system planning.
Analysis of the Implementation of Quality Management Systems in Construction Projects central Business Disctric Batavia Pantai Indah Kapuk, Jakarta City Hendra Hafit; Saputra, Rifaldi Adi
International Journal Science and Technology Vol. 4 No. 2 (2025): July: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v4i2.2288

Abstract

This research on a building construction project in the Central Business District (CBD) Batavia PIK Jakarta aims to analyze the implementation of the Quality Management System (QMS) in the project, focusing on identifying the practices of this quality management system, the challenges faced, and its impact on project quality outcomes. The method used in this research is descriptive quantitative with a survey approach. The research results show how the effective implementation of a Quality Management System (QMS) can improve the quality of construction projects, reduce the risk of errors, and increase stakeholder satisfaction. However, challenges exist, such as a lack of understanding of QMS principles among workers and resistance to change from some parties. This research also found that top management involvement and adequate employee training are key factors in the successful implementation of the Quality Management System (QMS). Recommendations include developing continuous training programs and improving communication among all stakeholders to support more effective QMS implementation in the future.
Analysis of Design Change Management in a Construction Project at Jl. Duta Permai 2 No. 6, Pondok Indah: Case of Owner Mr. Patrick Muhammad Malik Abdul Jabbar; Era Agita Kabdiyono
International Journal Science and Technology Vol. 4 No. 2 (2025): July: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v4i2.2289

Abstract

Design changes in construction projects often pose significant challenges, impacting the cost, quality, and timeline of the projects. This study aims to analyze the management of design changes in a construction project located at Jl. Duta Permai 2 No. 6, Pondok Indah, with a focus on identifying the causes, the management strategies implemented, and their overall impact on the project. The research employs a qualitative descriptive method, collecting data through interviews, observations, and analysis of relevant documents. The findings indicate that the primary factors causing design changes include regulatory changes, owner requests, and technical constraints that arise during construction execution. The management strategies applied by the project team, while systematic, still face challenges in communication that can hinder decision-making. The results reveal that poorly managed design changes can lead to project delays and cost increases of up to 20%. This study recommends enhancing communication among stakeholders and providing training on change management to minimize the impacts of design changes in the future. Through this analysis, it is expected to provide insights and references for project managers and future researchers in managing design changes more effectively
Comparative Analysis of the RAB for the Kampi Sunter Hotel Development Project Structural Work Package between AHSP 2024 and AHSP 2025 Afif Budi Santoso; Yuliyanti, Ervina
International Journal Science and Technology Vol. 4 No. 3 (2025): November: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v4i3.2290

Abstract

the dynamics of the building materials market and labor costs. Therefore, a constantly updated reference is needed to ensure accurate and efficient project cost estimates. One such reference is the Work Unit Price Analysis (AHSP) which is released by the government periodically. This study aims to analyze and compare the Cost Budget Plan (RAB) value for structural work on the Kampi Sunter Hotel construction project based on the Work Unit Price Analysis (AHSP) versions 2024 and 2025. The method used is a quantitative approach through cost estimation calculations using both versions of the AHSP. The results show that the total cost of structural work based on the 2024 AHSP is Rp15,384,577,550, while based on the 2025 AHSP it is Rp13,830,592,539. There is a difference of Rp1,553,985,011 or a decrease of approximately 10.1% in the 2025 AHSP. This decrease is caused by changes in the unit price of materials, one of which is the price of Ready Mix Concrete K300 which decreased from Rp1,048,722.00 (2024) to Rp931,683.00 (2025). Therefore, it is important for project planners to always update the AHSP reference used to match the applicable year to be more relevant.
Effects of Fuel Injector Seat Angle on Power, Torque, and Exhaust Emissions of a Single-Cylinder Four-Stroke Engine Surjadi, Eko; Wijoyo, Wijoyo; Septiawan, Diama Rizky
International Journal Science and Technology Vol. 4 No. 3 (2025): November: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v4i3.2347

Abstract

This study aims to examine the relationship and comparison of motor performance based on different fuel injector angles in a fuel injection system, and to identify the optimal injector angle for improved engine performance. Fuel injection is a control technology that regulates the air–fuel mixture entering the combustion chamber with speed, precision, and proportional balance. An experimental method was employed using a 2020 motorcycle with a 108 cc engine. The tests conducted included torque, power, and exhaust emission measurements. Torque and power were measured using a dynamometer, while exhaust emissions were analyzed with a gas analyzer. The study compared injector mounting angles of 60°, 70°, and 80°. Results showed that torque increased significantly from low engine speeds (around 3000 rpm) and peaked between 3500–3750 rpm before gradually declining. Among the tested angles, the 80° injector position produced the highest torque across most speed ranges, reaching approximately 15 Nm at 3500 rpm. The 70° angle yielded moderate performance, while the 60° angle demonstrated the lowest torque, especially at medium to high speeds. Overall, the study found that increasing the injector angle enhances torque and power output, with average increases of 6.1% in power and 6.4% in torque.
Computational Analysis of Bioethanol Production from Arenga Pinnata Sap using Rice Husk Biomass Heating: Statistical Modeling of Fermentation Time Effects on Alcohol Yield Saroinsong, Tineke; Mekel, Alfred Noufie; Motulo, Firmansyah Reskal
International Journal Science and Technology Vol. 4 No. 3 (2025): November: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v4i3.2348

Abstract

This study presents a comprehensive computational analysis of sustainable bioethanol production from Arenga pinnata sap using rice husk biomass as a renewable heating source. The research investigated fermentation time effects on alcohol yield through systematic experimentation and Python-based statistical modeling across four conditions: fresh sap, 1-day, 3-day, and 18-day fermentation periods. Distillation processes utilized 8.5 kg rice husk biomass at 80°C for 1.42 hours, producing 600 ml bioethanol per batch. Statistical analysis revealed a highly significant inverse correlation (r = -0.965, p < 0.05) between fermentation duration and alcohol content. Fresh palm sap yielded optimal alcohol concentration of 39.67 ± 7.76%, while 18-day fermentation reduced yield to 2.50 ± 2.50%, representing 93.7% decrease. The exponential decay model (R² = 0.984) demonstrated superior predictive accuracy compared to linear regression. The integrated system achieved 70.6 ml bioethanol per kg rice husk with positive energy balance (1.23 MJ output per MJ input), confirming commercial viability for rural renewable energy applications. This computational framework establishes optimal processing parameters for agricultural waste-powered biofuel systems, supporting circular economy principles and rural energy independence through effective biomass utilization in tropical regions.
The Effect of Temperature Variations on Sheet Press Machines on the Hardness and Toughness of PP (Polypropylene) and HDPE (High Density Polyethylene) Materials Slat, Winda Sanni; Runtuwene, Steven Johny; Djefry Hosang; Agnes Wakkary; Yenni Sigalingging
International Journal Science and Technology Vol. 4 No. 3 (2025): November: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v4i3.2376

Abstract

Global plastic waste continues to grow, making recycling essential for supporting a circular economy. Process parameters, especially heating temperature during sheet pressing, strongly influence the quality of recycled products. Objective: This study investigates how heating temperature affects the impact toughness and hardness of recycled Polypropylene (PP) and High-Density Polyethylene (HDPE) produced using a sheet press machine, and identifies the optimal processing temperature for improved mechanical performance. Methodology: This research used a quantitative experimental approach. Recycled PP and HDPE were shredded, then heated at 160°C, 170°C, 180°C, and 190°C for 120 minutes, and molded into sheet specimens using a sheet press machine. Mechanical properties were evaluated using Charpy impact testing in accordance with ASTM D6110 and Rockwell hardness testing (M scale) following ASTM D785. Results were compared across temperature variations to determine performance trends. Findings: Both materials showed improved impact toughness and hardness as temperature increased up to 180°C, indicating better melt uniformity, fewer voids, and stronger molecular bonding. For HDPE, impact toughness increased from 2.3 J at 160°C to 8.675 J at 170°C, reaching its peak at 180°C, then decreased at 190°C, suggesting early thermal degradation. For PP, the highest average hardness was 15.52 HRM at 180°C, followed by a decline at 190°C, consistent with structural softening and reduced crystallinity. Implications: The results suggest that controlling heating temperature particularly around 180°C can enhance the manufacturing efficiency and product quality of recycled plastic sheets, supporting more reliable and sustainable material utilization. Originality: This study provides practical evidence on the temperature–property relationship for sheet-pressed recycled PP and HDPE under controlled heating conditions and confirms 180°C as an optimal temperature before thermal damage reduces structural integrity.
Earned Value Analysis on the Tayan Bulking Station Project in East Kalimantan Yohanes Godman Ora Etlatius Woda Sidi; Triana, Masca
International Journal Science and Technology Vol. 4 No. 3 (2025): November: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v4i3.2377

Abstract

This study aims to analyze the cost and schedule performance and to estimate the final cost and completion time of the Tayan Bulking Station Project in West Kalimantan. The method used is Earned Value Analysis (EVA) by analyzing three main parameters: Budgeted Cost of Work Scheduled (BCWS), Budgeted Cost of Work Performed (BCWP), and Actual Cost of Work Performed (ACWP). Secondary data was obtained from PT. Sarana Remaja Mandiri, including the budget plan, S-curves, and weekly progress reports up to the 23rd week. The analysis continued by calculating variances (SV, CV), performance indices (SPI, CPI), and final estimates (EAC, ETC, ETS, EAS). The results indicate that the project's cost performance fluctuated. In the early project stages (weeks 1-9), there was a cost overrun (CPI < 1). However, in the subsequent period (weeks 10-23), cost performance improved significantly with cost efficiency (CPI > 1, reaching 2.35). Overall, the estimated final cost (EAC) is IDR 34.99 billion, which aligns with the initial budget (BAC). On the other hand, schedule performance tended to be delayed (SPI < 1) for most of the observation periods (weeks 1-14 & 18-23), although there was acceleration in weeks 15-17. The estimated project completion time (EAS) is 35 weeks, indicating a 1-week delay from the planned schedule of 34 weeks. The Earned Value method proved effective in identifying project performance. It is concluded that the Tayan Bulking Station Project is efficient in terms of cost but inefficient in terms of time, with a final delay of one week. This study recommends a greater focus on schedule control and improvement for this project and similar future projects.

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