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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 10 Documents
 1 
Search results for , issue "Vol. 5 No. 1 (2026): March: International Journal Science and Technology" : 10 Documents clear
Design and Development of a Press Machine for Biobriquettes Made from Patchouli Distillation Waste and Rice Husk Vincen Tandiapa; Rifan Pantow; Simon Simanjuntak; Friani Manoppo; Josephine Raphaela; Tineke Saroinsong; Alfred Noufie Mekel; Firmansyah Reskal Motulo; Estrela Bellia Muaja
International Journal Science and Technology Vol. 5 No. 1 (2026): March: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v5i1.2378

Abstract

The increasing availability of biomass residues such as patchouli distillation waste and rice husk presents an opportunity for renewable energy production; however, their utilization remains limited due to the lack of efficient and safe small-scale processing equipment. Developing practical briquette production systems is therefore essential to support sustainable energy use at household and MSME levels. Objective: This study aims to develop and evaluate a hydraulic briquette press capable of producing biomass briquettes from patchouli distillation waste and rice husk while enhancing operational safety, maintenance efficiency, and usability for small-scale production. Method: The research employed an engineering research-and-development approach involving machine design, prototype fabrication, and functional testing. Data were collected through technical observation and performance monitoring of pressing cycles, followed by descriptive analysis to evaluate operational functionality, safety response, and cleaning effectiveness. Findings: The developed press integrates a pressure-sensor-based safety system and an automatic pneumatic cleaning mechanism. The machine is capable of forming six briquettes per cycle at an operating pressure of approximately 50 kg/cm². The integrated systems functioned as intended, supporting stable operation, reducing manual cleaning needs, and improving operational safety. Implications: The proposed design demonstrates potential for improving briquette production efficiency and reliability in small-scale applications. By reducing downtime and enhancing safety, the system can support wider adoption of biomass briquette technology and contribute to community-level renewable energy utilization. Originality/Value: This study offers a novel integration of hydraulic pressing, automatic pneumatic cleaning, and pressure-based safety monitoring within a single multi-cavity briquette press, providing a practical and user-oriented solution for transforming agricultural waste into renewable energy products.
Industrial Artificial Intelligence Methods for Fabric Color-Defect Detection in Textile Manufacturing Byung-ho Kim; Hee-Sung Jae
International Journal Science and Technology Vol. 5 No. 1 (2026): March: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v5i1.2600

Abstract

Color-related fabric defects such as shade variation, off-shade, discoloration, and color bleeding remain challenging to detect consistently in textile manufacturing because camera-based inspection is highly influenced by illumination variability, fabric reflectance, and domain shift across production batches. These limitations often reduce the reliability of automated inspection systems and highlight the need for a systematic synthesis of existing Industrial Artificial Intelligence approaches. Objective: This study aims to systematically review and synthesize Industrial Artificial Intelligence methods for fabric color-defect detection to identify methodological trends, evaluation practices, and research gaps, as well as to explain why these approaches are important for improving reliability in industrial quality control. Method: The research employs a Systematic Literature Review design, collecting peer-reviewed studies through structured database searches followed by PRISMA-guided screening and eligibility assessment. The selected studies are analyzed using comparative narrative synthesis and standardized coding of method types, color representation, illumination handling strategies, datasets, and evaluation metrics. Findings: The review reveals four dominant methodological groups: classical computer vision, supervised deep learning, reconstruction-based anomaly detection, and feature-space anomaly or hybrid approaches. Across these approaches, robust performance consistently depends on a triadic design principle consisting of color-consistent representation, illumination robustness, and learning strategies aligned with label availability. The study also identifies a key evaluation gap where conventional vision metrics are rarely complemented by perceptual color-difference measures. Implications: The findings suggest that future research and industrial implementation should focus on developing color-calibrated datasets, adopting dual-axis evaluation frameworks that include perceptual color metrics, and validating models under varying illumination and fabric conditions to enhance real-world reliability. Originality/Value: This study provides an original contribution by proposing a color-defect–focused operational framework that integrates color science principles with Industrial AI method selection and deployment constraints, offering clearer guidance than previous reviews that primarily addressed structural textile defects.
Analysis of Natural Stone Wall Function Index Using Fuzzy Building Service Life (FBSL) Griselda Junianda Velantika; Ayu Fatimah Sari; Karina Meilawati Eka Putri; Elok Dewi Widowati
International Journal Science and Technology Vol. 5 No. 1 (2026): March: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v5i1.2612

Abstract

Natural stone wall claddings are widely used in residential buildings, but their functional performance often declines earlier than the building’s structural design life due to environmental exposure and installation-related deterioration. Objective: This study aims to quantify the functional condition of natural stone wall claddings using a Function Index (FI) so that maintenance decisions can be made more consistently and objectively. Methodology: A quantitative case-study approach was applied to five residential buildings in Situbondo Regency. Data were collected through field observations and building-age documentation, assessed using expert judgment, and analyzed using a fuzzy inference-based Fuzzy Building Service Life (FBSL) model to obtain a crisp FI score for each building. Findings: The results indicate that one building was classified as moderate/fair (FI = 56), while four buildings were classified as poor (FI = 0–23), implying higher maintenance urgency. When linked to the estimated Remaining Service Life (RSL) under an assumed 50-year design life and a 2020 observation year, an exploratory exponential relationship between FI and RSL was obtained (y = 12.177e0.3243x; R² = 0.7444). Implications: The FI can serve as a practical decision-support indicator to prioritize immediate repair, scheduled maintenance, or routine monitoring for façade components, even when the building still has considerable remaining design life. Originality: This research contributes by integrating a fuzzy-based functional condition index for natural stone claddings with a remaining service life perspective in a residential case-study context, bridging qualitative inspection outcomes with interpretable maintenance planning.
Circular Economy of Source-Separated Organic Waste in New York City Santunu Barua
International Journal Science and Technology Vol. 5 No. 1 (2026): March: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v5i1.2618

Abstract

New York City (NYC) generates more than one million tons of compostable organic waste annually, most of which is still landfilled, contributing to greenhouse gas emissions and resource loss. Objective: This review aims to examine the circular economy potential of source-separated organic waste (SSOW) in NYC, with a primary focus on the residential curbside organics program. Method: This study uses a systematic literature review approach by synthesizing peer-reviewed articles, government reports, program documents, and policy records related to composting, anaerobic digestion (AD), community composting, life-cycle assessment (LCA), and NYC’s regulatory framework. Findings: The findings show that landfilling organic waste produces nearly 400 kg CO₂e per tonne, whereas composting generates net negative emissions of approximately −41 kg CO₂e per tonne and dry AD for renewable natural gas yields −36 to −2 kg CO₂e per tonne. Although NYC’s mandatory curbside composting program was fully enforced in April 2025 and collected more than 30,000 tons of organics in 2024, residential capture rates remain below 5%, indicating persistent challenges in infrastructure, public education, contamination control, and multi-family building compliance. Implications: These results imply that an integrated system combining composting, AD, and community composting can improve resource recovery, climate performance, and social participation. Originality: The originality of this review lies in its integrated analysis of technical, environmental, regulatory, and community dimensions of SSOW management within a single circular economy framework, providing a policy-relevant perspective for advancing zero-waste strategies in dense metropolitan contexts.
Design of a National-Standard Electrical Installation for a Polyclinic: A Case Study of Cibubur Hospital Polyclinic with Load, Lighting, and Backup System Analysis Andi Galing; Erfiana Wahyuningsih
International Journal Science and Technology Vol. 5 No. 1 (2026): March: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v5i1.2614

Abstract

Electrical installation systems in healthcare facilities must ensure safety, reliability, and operational continuity because medical services depend on stable power supply and adequate lighting conditions. In polyclinic environments, electrical disturbances may affect service quality and patient safety, making proper system design essential. Objective: This study aims to design and evaluate the electrical installation of the Cibubur Hospital Polyclinic based on national standards, focusing on load distribution, lighting performance, backup power systems, and grounding effectiveness. Method: This research employs a mixed qualitative–quantitative descriptive approach. Data were collected through field observations, direct measurements using electrical instruments (clamp meter, lux meter, and earth tester), and documentation review of installation layouts and technical standards. The analysis was conducted through technical calculations and standard-based evaluation. Results: The total electrical load is divided into 11,883 W for normal PLN load and 7,406 W for priority UPS load, indicating a functional separation between general and critical services. Lighting measurements show that seven out of ten rooms meet the required standards, while three rooms remain below the threshold. The grounding system demonstrates resistance values well below the allowable limit, indicating effective protection performance. Implications: The results indicate that integrated electrical installation design can support safe and continuous healthcare operations, although improvements in lighting uniformity and system specification consistency are still required. Originality: This study offers an integrated evaluation of load distribution, lighting, backup power, and grounding within a single polyclinic case study, providing practical and academic contributions to electrical system design in healthcare facilities.
Performance Evaluation of Porous Asphalt Mixtures Incorporating Cotton Cloth Ash as Filler Based on Marshall Characteristics and Permeability Dicky Dwi Firmansyah; Aditya Rizkiardi; Nurani Hartatik
International Journal Science and Technology Vol. 5 No. 1 (2026): March: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v5i1.2653

Abstract

Porous asphalt is designed to improve surface drainage and reduce water accumulation; however, its performance depends on the balance between mechanical strength and permeability. The use of alternative filler materials, particularly textile-derived waste such as cotton cloth ash, remains limited. Objective: This study aims to evaluate the performance of porous asphalt mixtures incorporating cotton cloth ash as a substitute filler, focusing on optimum asphalt content, Marshall characteristics, and permeability behavior. Methodology: An experimental quantitative approach was conducted in a laboratory. The mixture design followed the Australian Asphalt Pavement Association (AAPA, 2004) method. Data were obtained through material testing, Marshall testing, and permeability testing. Key parameters analyzed included Void in Mix (VIM), Stability, Flow, Marshall Quotient (MQ), Cantabro Loss (CL), Asphalt Flow Down (AFD), and permeability. Findings: The Optimum Asphalt Content (OAC) was identified at 4.80%. The best mechanical performance occurred at 4.5%–5% asphalt content, with maximum stability of 832 kg and MQ of 530 kg/mm. Permeability increased with asphalt content, reaching 0.20 liter/second at 6%, indicating improved drainage but reduced structural performance at higher binder levels. Implications: The results highlight the importance of optimizing asphalt content to achieve a balance between mechanical strength and hydraulic performance in porous asphalt design. Originality: This study introduces cotton cloth ash as an alternative filler, demonstrating its feasibility in maintaining functional and structural performance while supporting sustainable pavement materials.
Evaluation of Energy Efficiency and Illuminance Performance of LED Lighting Systems in Office Spaces Using DIALux Simulation Aat Januar Habibi; Erfiana Wahyuningsih
International Journal Science and Technology Vol. 5 No. 1 (2026): March: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v5i1.2613

Abstract

Energy efficiency in office buildings has become a critical issue due to increasing electricity consumption, particularly in lighting systems that operate continuously. Inefficient lighting design can lead to excessive energy use, higher operational costs, and reduced sustainability performance in commercial buildings. Objective: This study aims to analyze the implementation of Light Emitting Diode (LED) technology to improve energy efficiency in office lighting systems using DIALux simulation, while ensuring compliance with standard illumination requirements. Method: This research employs a quantitative descriptive approach supported by simulation modeling. Data were collected through field observation, illumination measurement using a lux meter, and documentation of room specifications. The analysis was conducted using DIALux software to evaluate illuminance levels, light distribution, and energy consumption based on office lighting standards. Findings: The results indicate that the LED lighting system achieves an average illuminance of 340 lux, which meets the SNI 6197:2011 standard (300–500 lux), with a uniformity ratio of 0.68 indicating adequate light distribution and visual comfort. The system consumes 36 kWh per month, which is more than 50% lower than conventional fluorescent (TL) lighting systems. Implications: The findings suggest that LED lighting systems can provide efficient and compliant lighting solutions while significantly reducing energy consumption and operational costs. This supports the implementation of energy-efficient and sustainable building practices. Originality: The originality of this study lies in its integrated approach that combines room characteristics, LED configuration, and DIALux simulation to evaluate lighting performance and energy efficiency simultaneously, offering a practical framework for office lighting design.
Effects of Different Compost Types on the Growth and Yield of Amaranth (Amaranthus spp.) Akhmad Hamam Nasirudin; Rennanti Lunnadiyah Aprilia
International Journal Science and Technology Vol. 5 No. 1 (2026): March: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v5i1.2658

Abstract

Vegetable amaranth is a fast-growing leafy vegetable with high nutritional value and strong potential for sustainable cultivation. Livestock-manure compost is increasingly used as an environmentally friendly nutrient source to improve crop growth and reduce dependence on inorganic fertilizers. Objective: This study aimed to evaluate the effects of different livestock-manure composts on the growth and yield of several vegetable amaranth varieties under polybag cultivation and to identify the most effective treatment combination. Method: The study was conducted in Jatisari Village, Kebumen District, Central Java, Indonesia, from January to February 2026. A quantitative experimental approach was applied using a 3 × 4 factorial randomized complete block design with nine effective blocks. The first factor was compost type, namely chicken-, goat-, and cow-manure compost, while the second factor was amaranth variety, namely green, uproot, red, and batik amaranth. Data were collected through direct plant measurements and analyzed using ANOVA followed by DMRT at the 5% level. Findings: The interaction between compost type and variety significantly affected plant height, number of leaves, leaf area, fresh plant weight, dry plant weight, fresh root weight, and dry root weight, but did not significantly affect root length. The best overall performance was obtained from cow-manure compost combined with green amaranth (P3V1). Implications: Cow-manure compost is a promising organic input for improving vegetable amaranth productivity under polybag cultivation. Originality: This study provides comparative evidence on three livestock-manure composts across four amaranth varieties under local cultivation conditions.
Quality Characteristics of Fermented Arabica CascaraTea using SCOBY-Kombucha Fermentation in Different Drying Methods Nur Faidah Munir; Muhammad Kadir; Suwandi Suwandi; Reta Reta
International Journal Science and Technology Vol. 5 No. 1 (2026): March: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v5i1.2672

Abstract

Arabica coffee processing generates coffee cherry skin or husk as a by-product that is often underutilized and treated as waste, despite its potential to be processed into cascara tea as a value-added functional beverage. The application of SCOBY-kombucha fermentation offers an innovative approach to improve the chemical and sensory quality of cascara tea. Objective: This study aimed to analyze the quality characteristics of cascara tea produced from Arabica coffee husks fermented with SCOBY-kombucha under different drying methods. Method: This study employed a quantitative experimental approach using a completely randomized design (CRD). The treatments consisted of fermentation and non-fermentation combined with two drying methods, namely tray-dryer and sun-dryer. Data were collected through laboratory analysis of moisture content, total phenol content, and tannin characteristics, as well as organoleptic testing of color, aroma, and taste. The data were analyzed using analysis of variance (ANOVA). Results: The results showed that drying methods had no significant effect on the quality of cascara tea in terms of moisture content and total phenol content. However, SCOBY-kombucha fermentation reduced tannin content and improved the aroma characteristics of the tea. The best treatment was obtained from SCOBY-kombucha fermentation combined with tray-dryer drying, producing cascara tea with 4.8% moisture content, total phenol content of 1191.6 mg GAE/100 g, lower tannin content, and acceptable sensory characteristics. Implications: The findings indicate that fermentation can enhance the quality and consumer acceptability of cascara tea, while supporting the utilization of coffee-processing by-products into value-added products in the agroindustrial sector. Originality/Value: This study provides a novel contribution by integrating SCOBY-kombucha fermentation and drying methods in cascara tea production, offering a comprehensive evaluation of their combined effects on chemical and sensory quality.
A Standardized and Interoperable Approach for Multi-Vendor DAS–DIS Integration in Continuous Emission Monitoring Systems Hery Herawan
International Journal Science and Technology Vol. 5 No. 1 (2026): March: International Journal Science and Technology
Publisher : Asosiasi Dosen Muda Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56127/ijst.v5i1.2629

Abstract

The increasing complexity of industrial emissions and the limitations of conventional monitoring systems have created an urgent need for reliable, real-time, and interoperable emission monitoring solutions. In Continuous Emission Monitoring Systems (CEMS), the integration of heterogeneous data from multi-vendor Data Acquisition Systems (DAS) remains a major challenge, particularly in relation to data consistency, interoperability, and regulatory compliance. Objective: This study aims to develop an integrated DAS–DIS framework that standardizes data processing and communication across heterogeneous industrial environments. Method: This research employed a system engineering approach using a prototype-based development method. Data sources included regulatory documents, technical standards, and simulated emission datasets in CSV, XML, and JSON formats. The system was designed using a JSON-based Unified Data Model (UDM), supported by ISO 8601 timestamps, quality codes, HMAC-based digital signatures, and hybrid HTTP–MQTT communication protocols. Functional testing and simulation were conducted to evaluate data transformation, validation, and transmission. Findings: The results show that the proposed system can transform heterogeneous DAS outputs into a consistent and standardized structure while maintaining data integrity and reliability. JSON schema validation and digital signatures support secure data exchange, while the hybrid communication architecture enables both regulatory reporting and real-time monitoring. Implications: The proposed framework can improve interoperability, reliability, and operational efficiency in industrial emission monitoring systems, while also supporting regulatory compliance and data-driven environmental management. Originality: This study offers an integrated and application-oriented framework that combines data standardization, communication architecture, and validation mechanisms within a single system specifically designed for multi-vendor CEMS integration.

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