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G-Tech : Jurnal Teknologi Terapan
Published by Universitas Islam Raden Rahmat Malang
ISSN : 25808737     EISSN : 2623064X     DOI : -
Core Subject : Science, Engineering,
Computer Science & IT Decision Sciences, Operations Research & Management Energy Engineering
Jurnal G-Tech bertujuan untuk mempublikasikan hasil penelitian asli dan review hasil penelitian tentang teknologi dan terapan pada ruang lingkup keteknikan meliputi teknik mesin, teknik elektro, teknik informatika, sistem informasi, agroteknologi, dll.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 984 Documents
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Analysis of Construction Material Waste in Hospital Building Projects Using Pareto and Fishbone Approaches Grace Yoyce Malingkas; Muhammad Ihsan Jasin; Jessen Granbey Potalangi
G-Tech: Jurnal Teknologi Terapan Vol 10 No 3 (2026): G-Tech, Vol. 10 No. 3 July 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i3.10119

Abstract

Material is one of the most important components in construction projects because it serves as the primary element of building structures and significantly influences project costs. Ineffective material management can result in construction material waste, leading to increased costs and reduced resource efficiency. This study aims to identify the dominant waste-generating materials and analyze the factors causing material waste in the Hermana Lembean General Hospital construction project. Data were collected from as-built drawings, material logistics reports, and field interviews. The Pareto method was used to determine the dominant waste materials, while the Fishbone Diagram method was applied to identify the root causes of material waste. The results showed that the total construction material waste generated during the project was 3,951.784 units. Pareto analysis indicated that reinforcing steel (53.21%), wall ceramic 60 × 60 cm (11.38%), lightweight brick (8.49%), and floor ceramic 60 × 60 cm (7.49%) were the dominant waste materials, accounting for more than 80% of the total waste volume. Fishbone Diagram analysis revealed that material waste was mainly caused by machine, method, material, manpower, and measurement factors. These findings can be used to improve material management and reduce waste in future construction projects.
Web-Based Information System for Monitoring and Evaluating the Quran Memorization of Tahfidz Students Holida Izzatilla; Abd. Ghofur; Lukman Faqih Lidimilah
G-Tech: Jurnal Teknologi Terapan Vol 10 No 3 (2026): G-Tech, Vol. 10 No. 3 July 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i3.10127

Abstract

The use of information technology in the Islamic boarding school environment, particularly in the Qur’an memorization program, is a crucial tool for improving the effectiveness of monitoring students’ progress. Currently, the management of memorization data at the Salafiyah Syafi’iyah Sukorejo Islamic Boarding School is still conducted conventionally, resulting in a high risk of data loss, inefficient report compilation, and a lack of transparency in information for students’ guardians. This study aims to design and implement a web-based memorization monitoring information system that integrates workflows among administrators, educators, and parents. System development employs the Software Development Life Cycle (SDLC) methodology using the Waterfall model, encompassing the stages of requirements analysis, architectural design, implementation using the Laravel framework, and system testing. Black-box testing results indicate that all system features functioned according to specifications, with a functional success rate of 100%. Additionally, white-box testing through conditional logic validation ensured that all program workflows, including the authentication module and target achievement calculations, operate stably. The main contribution of this research lies in the implementation of a personalized automatic notification mechanism, which allows guardians to monitor their children’s memorization progress in real-time while facilitating proactive coaching interventions.
Implementation K-Means Algorithm and Decision Tree for Prediction Graduation in Vocational School Student Diploma Data Yohanes Brekmans M Darkel; Hilarius Alfan; Gerfasius Take Piran; Henderikus Basilius Nong Muda
G-Tech: Jurnal Teknologi Terapan Vol 10 No 3 (2026): G-Tech, Vol. 10 No. 3 July 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i3.10139

Abstract

This study aims to analyze vocational high school (SMK) students' diploma data using two data mining approaches: the K-Means algorithm for clustering and the Decision Tree for classification and graduation prediction. The application of these two methods provides insights into the clustering structure of students based on their diploma scores and produces a more accurate graduation prediction model. Data processing was conducted using RapidMiner through preprocessing, K-Means clustering, and classification modeling with Decision Tree. The results indicate that K-Means successfully forms student clusters based on the similarity of their scores, while Decision Tree generates classification rules that can be used to predict graduation categories. This study contributes to academic evaluation and enhances data-driven decision-making in the school environment.
Smart Mail Management System at the Faculty of Science and Technology, Universitas Ibrahimy Wardhatun Khasanah; Abd. Ghofur; Firman Santoso
G-Tech: Jurnal Teknologi Terapan Vol 10 No 3 (2026): G-Tech, Vol. 10 No. 3 July 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i3.10145

Abstract

The increasing demand for efficient administrative services in higher education institutions has highlighted the need for effective correspondence management systems. Conventional mail handling processes often result in delays, misrouted documents, difficulties in archiving, and challenges in information retrieval. This study aims to develop a web-based Smart Mail Management System by integrating Optical Character Recognition (OCR), rule-based intelligent routing, automated notifications, and digital approval features to improve correspondence management within the Faculty of Science and Technology, Universitas Ibrahimy. The research employed a Research and Development (R&D) approach using the Waterfall Software Development Life Cycle (SDLC), which consists of requirements analysis, system design, implementation, testing, and maintenance. Data were collected through observation, interviews, documentation analysis, and literature review. OCR technology was utilized to convert scanned letters into digital text, while a rule-based mechanism automatically classified and routed correspondence to the appropriate recipient. The results indicate that the proposed system reduces manual processing, improves routing accuracy, accelerates document handling, enhances document traceability, and facilitates centralized digital archiving. Furthermore, the integration of automated notifications and digital approval features supports a more efficient administrative workflow. These findings demonstrate that the developed system contributes to improving the effectiveness, accuracy, and efficiency of correspondence management while supporting digital transformation initiatives in higher education institutions.
Mechanical Characteristics of High Plasticity Clay Stabilized Using Lime and Rice Husk Ash Catur Bejo Santoso; Dora Melati Nurita Sandi; Megalita Rodiyani
G-Tech: Jurnal Teknologi Terapan Vol 10 No 3 (2026): G-Tech, Vol. 10 No. 3 July 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i3.10161

Abstract

High-plasticity clay is a type of problematic soil due to its low bearing capacity, low unconfined compressive strength, and high shrinkage-swelling potential. Stabilization is one method for improving the soil's characteristics. The research was conducted through physical property testing of natural soil, including sieve analysis, atterberg limits, moisture content, bulk density, and specific gravity tests, as well as mechanical testing using the UCS method on natural soil and stabilized soil with three mixture variations, namely Variation 1 (5% lime + 4% RHA), Variation 2 (5% lime + 8% RHA), and Variation 3 (5% lime + 12% RHA). The natural soil had an average UCS value of 23.55 kPa, while Variation 1 increased to 95.51 kPa, Variation 2 reached 193.50 kPa, and Variation 3 reached 114.71 kPa. Variation 2 produced the highest UCS value among the variations. The UCS increased by approximately 722% at the optimum mixture of 5% lime + 8% RHA. This study demonstrates that the use of lime and RHA significantly improves the mechanical characteristics of high-plasticity clay.
Numerical Method-Based Study on Deformation and Fatigue Life of SKD 11 Dies and Punches Fadhil Fadhlurrohman Nurhadi; Abdul Wahid Arohman; Desy Agustin; Hikari Qurrata’ain Nurhadi
G-Tech: Jurnal Teknologi Terapan Vol 10 No 3 (2026): G-Tech, Vol. 10 No. 3 July 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i3.10170

Abstract

Progressive die stamping is critical in automotive component manufacturing, yet fatigue failure of dies and punches remains a key challenge that directly impacts tool life and production continuity. This study aims to evaluate the structural integrity and comparative fatigue life of four steel for cold die (SKD) 11 compound progressive die components: die button, punch pierce, die blank, and punch blank, to translate the findings into practical maintenance scheduling criteria. This study presents a sequential finite element analysis (FEA) framework, comprising static structural analysis followed by stress-life fatigue assessment to evaluate the structural integrity and cyclic service life of SKD 11 tool steel components in a compound progressive die for automotive hanging bracket stamping. Three-dimensional models were analyzed in ANSYS Workbench using tetrahedral meshing with convergence verified at <5% variation in peak von Mises stress. Cutting forces were derived from the formulation P = L × t × σB, with mean stress correction applied via the Goodman approach using empirical SKD 11 S-N data. Static analysis confirmed all components satisfy structural safety criteria, with von Mises stresses ranging from 286 MPa to 979 MPa, all below the SKD 11 yield strength of 1,540 MPa and maximum deformation within 0.023 mm. Fatigue analysis revealed a pronounced life disparity: the die blank exhibited a minimum cycle life of 69,215 cycles, while the punch pierce showed the most critical behavior at 827 cycles. The punch pierce requires inspection every 500–800 cycles, while future research should investigate fillet geometry optimization and surface coating effects to further extend punch service life.
Continuously Variable Transmission Roller Mass Analysis with Drive Pulley Angle Variations of 13.5° and 12° on a 150 cc V - Matic Automatic Transmission Motorcycle Luchyto Chandra Permadi; Mojibur Rohman; Ratna Fajarwati Meditama; Bella Cornelia Tjiptady; Faisol Khoufi Asshidiqi; Mudrikah Mudrikah; Bagus Sriwijaya
G-Tech: Jurnal Teknologi Terapan Vol 10 No 3 (2026): G-Tech, Vol. 10 No. 3 July 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i3.10171

Abstract

The Continuously Variable Transmission (CVT) system plays a crucial role in transmitting power from the engine to the drive wheels while automatically adjusting the transmission ratio according to vehicle speed and load conditions. Automatic transmissions have gained widespread attention in the automotive industry due to their high efficiency, smooth gear shifting, cost-effectiveness, and enhanced driving comfort. This study aims to investigate the effect of drive pulley angle variation and roller weight on the performance characteristics of a CVT system, particularly in terms of power output, torque, vehicle speed, and acceleration. An experimental method was employed by modifying the drive pulley angle and roller weight configurations, followed by performance testing using a dynamometer (dynotest). Several combinations of pulley angles and roller weights were evaluated to determine the optimal configuration for vehicle performance. The results indicate that a drive pulley angle of 13.5° combined with a 10-gram roller produced the most stable torque and power characteristics across low to high engine speeds. This configuration also provided superior acceleration performance and smoother power delivery under urban driving conditions. The findings offer practical insights for optimizing CVT design and tuning to improve vehicle efficiency, responsiveness, and overall driving performance.
Performance Analysis of VGG16 and MobileNetV2 Using Transfer Learning Approach for Paper Currency Classification Arnindita Nanda Saputri; Dina Yulina Heriyani; Buntoro Irawan
G-Tech: Jurnal Teknologi Terapan Vol 10 No 3 (2026): G-Tech, Vol. 10 No. 3 July 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i3.10224

Abstract

Cash still dominates transactions in Indonesia, but the process of classifying banknote denominations in automated systems such as ATMs and digital cashiers still faces challenges in terms of accuracy and efficiency. Misidentification of banknote denominations can reduce the reliability and operational efficiency of the system. Therefore, selecting the right algorithm method is crucial. This study compares the performance of VGG16 and MobileNetV2 using transfer learning. The dataset contains 2,100 Indonesian banknote images from seven classes. Both models were trained using pre-trained weights from ImageNet and evaluated using accuracy, precision, recall, F1-score, and computation time. The results showed that MobileNetV2 outperformed VGG16, achieving 94.76% accuracy, 94.99% precision, 94.76% recall, and 94.74% F1-score, with a training time of 569 seconds. In comparison, VGG16 achieved 87.62% accuracy, 89.04% precision, 87.62% recall, and 87.67% F1-score, requiring a training time of 1456 seconds. These results indicate that MobileNetV2 extracts features more effectively and generalizes better. This study demonstrates that MobileNetV2 can be used as an optimal solution for developing an accurate and efficient image-based banknote classification system.
Parametric Evaluation of Building Height Effects on Seismic Code Compliance of RC Special Moment Frames Using OpenSeesPy Usman Wijaya; Romain Turpin; Jean Castaing-Lasvignottes; Dimas Prasasti Renandhito; Liana Herlina
G-Tech: Jurnal Teknologi Terapan Vol 10 No 3 (2026): G-Tech, Vol. 10 No. 3 July 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i3.10249

Abstract

This study presents a parametric evaluation of building-height effects on the global seismic response and initial code-compliance indicators of reinforced concrete Special Moment Frames (RC-SMFs). The work is limited to linear response-spectrum analysis and global screening checks; nonlinear static analysis, non liner time-history analysis, and detailed SNI 2847 member design are outside the present scope. Three OpenSeesPy-based three dimensional models with 6, 9, and 12 stories were developed using the same structural plan, maximum analytical beam span of 9.5 m, Jakarta soft-soil seismic demand, and SNI 1726:2019 design parameters. The novelty of the study is an integrated OpenSeesPy parametric workflow that evaluates modal regularity, modal participating mass ratio, base-shear scaling, design drift, torsional response, and P-Delta stability in one SNI-oriented assessment process. The results show a regular modal sequence for all models, with Mode 1 and Mode 2 dominated by X- and Y- translation and, Mode 3 governed by torsion. As the number of stories increases, the fundamental period increases from 0.365 s to 0.537 s and 0.689 s, while the equivalent lateral force base shear increases from 7,918.73 kN to 11,878.09 kN and 15,837.45 kN. The maximum design drift increases with building height but remains far below the 2.0% allowable limit, while torsion ratios and P-Delta coefficients remain low. Thus, the adopted RC-SMF configuration satisfies the selected linear global screening checks, although final acceptance still requires nonlinear assessment and detailed member design.
Reinforcing Column Enlargement Using the Chemical Anchor Method in a Hotel Construction Project Ety Fitriyani; Hulfa Istikomah; Vivid Lucha Deanggi; Saddam Mirza; Demmy Adhi Mulya Darma; Mutia Gina Savira
G-Tech: Jurnal Teknologi Terapan Vol 10 No 3 (2026): G-Tech, Vol. 10 No. 3 July 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i3.10257

Abstract

This study aims to identify the need for reinforcing column enlargement of a coffee shop structure in a hotel project due to concerns related to the adequacy of the existing column capacity during the construction stage. The evaluation was conducted through a three-dimensional structural reanalysis using SAP2000, based on the design drawings, material quality, and load combinations as specified in the project standards. The results of the analysis showed that most of the existing K1 columns, measuring 150 x 1000 mm, had a stress ratio exceeding 1.0, with the highest value reaching 1.32. It means that they do not meet the strength criteria and need reinforcement. The selected alternative was to enlarge the column dimensions to 250 x 1000 mm by adding 14D19 reinforcement and applying the chemical anchor method to ensure monolithic action between the old and new concrete. The reanalysis reduced the maximum stress ratio of the reinforced columns to 0.85, so that all columns satisfied the strength criteria. Verification of the chemical anchor system showed that all failure modes had load-to-capacity ratios below 1.0, with a maximum of 0.56 in the pull-out/bond mode. In terms of quality, time, and cost, the chemical anchor method was more efficient than the steel jacketing composite method, with an estimated 30–40% reduction in execution time and approximately 25% lower cost.

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