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Dedi Purwanto Indra Kusuma
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RESWARA: Jurnal Riset Ilmu Teknik
Published by Lembaga Penelitian dan Pendidikan (LPP) Kalibra
ISSN : -     EISSN : 30259444     DOI : https://doi.org/10.70716/reswara
Core Subject : Engineering,
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation
RESWARA: Jurnal Riset Ilmu Teknik is a leading scholarly platform that examines the strategic role of engineering disciplines in advancing the Sustainable Development Goals (SDGs). The journal is dedicated to publishing recent research, innovations, and engineering solutions that support sustainable development. The editorial board welcomes manuscripts based on theoretical frameworks and empirical research. The journal scope covers scientific knowledge and research-based information, including applied research and recent developments in engineering research and development. The primary focus includes Civil Engineering and Spatial Planning, Industrial Engineering, Electrical Engineering and Informatics, Earth Science Technology, and Naval Architecture. All manuscripts published in RESWARA undergo a double-blind peer review process. The final decision on manuscript acceptance rests with the Editorial Board, based on recommendations from independent peer reviewers.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 131 Documents
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Perbandingan Regresi dan Exponential Smoothing untuk Peramalan Beban Puncak PT. PLN Batam Tahun 2026 Ardhani Ardhani; Hery Irawan
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.680

Abstract

Peak load forecasting plays a crucial role in power system operation planning by ensuring supply reliability and improving operational efficiency. This study aims to compare the forecasting performance of Linear Regression, Holt, and Holt–Winters methods in predicting the monthly peak load of PT PLN Batam and to identify the most accurate forecasting model. A quantitative time-series approach was employed using monthly peak load data collected from 2021 to 2025. Data from 2021–2024 were used for model training, while the 2025 dataset was reserved for validation. Model development was carried out in Python using the Pandas, NumPy, and Statsmodels libraries. Forecasting accuracy was evaluated using Mean Absolute Error (MAE), Mean Squared Error (MSE), Root Mean Squared Error (RMSE), and Mean Absolute Percentage Error (MAPE). The results demonstrate that the Holt–Winters method outperformed the Linear Regression and Holt models, achieving an MAE of 8.1, an MSE of 115.1, an RMSE of 10.7, and a MAPE of 1.13%. Based on the selected model, the projected monthly peak load for PT PLN Batam in 2026 ranges from 694.79 MW to 747.85 MW. These findings indicate that the Holt–Winters method effectively captures both trend and seasonal patterns, making it a reliable approach for supporting generation capacity planning and operational decision-making in electric power systems.
Analisis Perubahan Borrow Area Material Inti Terhadap Harga Satuan Pekerjaan Timbunan pada Proyek Pembangunan Bendungan Jragung, Kabupaten Semarang Ima Fisriyanto; Muhammad Zaki
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.689

Abstract

This study aims to analyze the effect of changes in the borrow area of core material on the unit price of embankment work in the Jragung Dam Project, Semarang Regency. The research employed a quantitative-descriptive approach using primary data from soil laboratory test results and secondary data obtained from project documents. Samples were selected through purposive sampling from three borrow area locations with a total of 15 testing points. The analysis involved technical and economic evaluations of material suitability, volume availability, and the impact of borrow area changes on construction costs. The results showed that the initial borrow area material did not meet technical specifications and experienced a volume shortage of 294,896.45 m³ due to gravel content, tuffaceous layers, and organic soil. An alternative material source from Gunung Mergi, located 23–25 km from the project site, was selected and met the required technical specifications. However, the change in material source increased the unit price of embankment work from IDR 115,860.00 to IDR 248,478.00 due to longer hauling distances and additional material management requirements, including stockpile utilization to maintain moisture content. The novelty of this study lies in integrating technical material suitability, volume availability, and economic impacts of borrow area changes within a single evaluation framework. The findings provide a practical basis for material source selection, risk management of borrow area changes, and more accurate cost estimation in dam construction projects.
Analisis Kinerja Distribusi dan Bottleneck Operasional pada Rantai Pasok Usaha Barang Bekas: Studi Kasus UD. DOA ABADI, Semarang Fajriansyah Mahdy Tsani; Rifki Navis Haidar
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.690

Abstract

The trade of used goods is a vital component of the circular economy, as it extends the material lifecycle through collection, sorting, storage, and redistribution activities. However, the uncertain and heterogeneous nature of the supply creates supply chain management challenges, particularly regarding distribution performance. This study aims to evaluate the distribution performance of the supply chain system at UD. DOA ABADI, a used-goods trading business in Semarang City dealing in commodities such as scrap iron, cardboard, paper, and plastic bottles. A descriptive quantitative approach with a single case study design was employed, utilizing operational data from June 2025 to June 2026. The analysis utilized an inventory mass balance model and distribution performance indicators—specifically inflow-outflow balance, warehouse utilization, and inventory turnover—alongside an operational capacity bottleneck analysis and an evaluation based on the Supply Chain Operations Reference (SCOR) model. The results indicate that the company's distribution capacity has not fully kept pace with the supply rate, resulting in gradual stock accumulation, increased warehouse utilization, and slower inventory turnover. Bottleneck analysis identified the distribution fleet as the primary operational constraint, as it operates near maximum capacity limits; meanwhile, external factors—specifically the vulnerability to tidal flooding in the North Semarang coastal area—pose a risk of further exacerbating distribution disruptions. This study demonstrates that combining simple operational indicators with the SCOR model is effective for evaluating distribution performance in informal, circular economy-based businesses and provides a foundation for recommendations to improve distribution efficiency within the micro-scale used-goods trading sector
Effect of Oil Palm Frond-Derived Carboxymethyl Cellulose (CMC) on the Physicochemical and Sensory Characteristics of Chili Sauce Muhammad Arif; Sri Wahyuna Saragih; Ritna Wahyuni
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.697

Abstract

Oil palm fronds are abundant agricultural biomass with high cellulose content that can be converted into carboxymethyl cellulose (CMC) as a natural food thickener. This study aimed to evaluate the effect of oil palm frond-derived CMC on the physicochemical and sensory characteristics of chili sauce and to determine the optimum CMC concentration. A completely randomized design was applied using four CMC concentrations (0, 0.5, 1.0, and 1.5%) with three replications for each treatment. The evaluated parameters included moisture content, pH, crude fiber, texture, vitamin C, viscosity, aroma, and taste. Data were analyzed using one-way analysis of variance followed by Duncan's multiple range test at a 5% significance level. The results showed that increasing CMC concentration significantly reduced moisture content from 84.55% to 83.30% while increasing pH from 3.97 to 4.15, crude fiber from 1.24% to 1.72%, texture from 1.33 to 2.14 N, vitamin C from 22.81 to 24.44 mg/100 g, and viscosity from 2,334.33 to 4,275.00 cP (p < 0.05). Sensory evaluation also showed significant differences, with the 1.0% CMC treatment receiving the highest aroma (4.80) and taste (4.90) scores. These findings indicate that oil palm frond-derived CMC can serve as an effective natural thickening agent for chili sauce, with a concentration of 1.0% providing the best balance between physicochemical quality and consumer acceptance.
Analysis of Factors Causing Delays in MCT Sealing Block Handi Block HB40 Material Distribution for Offshore Fabrication Using Fishbone Diagram Setyananda Ikhsan Al-Mishkey; Hery Irwan
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.698

Abstract

Material distribution delays can disrupt offshore fabrication because production activities depend on the timely availability of specialized materials. This study aims to identify the root causes of delays in the distribution of MCT Sealing Block Type Handi Block HB40 materials using Root Cause Analysis (RCA) through the Fishbone Diagram. A descriptive qualitative case study approach was employed. Data were collected through direct observations of material planning, procurement, shipment, monitoring, and receiving processes, supported by document reviews and relevant literature. The analysis included problem identification, cause classification, Fishbone Diagram development, and interpretation of causal relationships. The results indicate that distribution delays are influenced by five interrelated factors: Man (People), Method, Material, Machine/Facilities, and Environment. The major causes include inadequate coordination, insufficient integration between distribution planning and fabrication schedules, uncertain supplier lead times, limited shipment tracking, and weather and multimodal transportation constraints. The Fishbone Diagram demonstrates that distribution delays result from the interaction of these factors rather than a single dominant cause. The findings provide a systematic framework for improving offshore material distribution by strengthening cross-functional coordination, integrating planning with fabrication schedules, improving supplier lead-time management, and enhancing shipment monitoring systems.
Analysis of Broken Connector Defects on the G0FL Line Using the PDCA Method in a Wiring Harness Company Gilang Fachrat Firmansyah; Hery Irwan
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.700

Abstract

Product quality is a critical determinant of competitiveness in the wiring harness industry because defects in connector components may disrupt electrical continuity, assembly performance, and customer satisfaction. One recurring problem found on the G0FL line of a wiring harness company was broken connector defects, which contributed significantly to total line defects. This study aims to analyze the causes of broken connector defects and propose quality improvement actions using the Plan-Do-Check-Act method supported by seven quality control tools. The research was conducted through direct observation, defect data collection, Pareto analysis, cause-and-effect analysis, 5W+1H analysis, and before-after defect comparison. The initial observation showed that broken connector defects accounted for the largest proportion of defects on the G0FL line. Root cause analysis indicated several dominant causes, including improper handling, unstable material positioning, insufficient operator awareness, inappropriate work methods, and weak process monitoring. Improvement actions were implemented through work instruction revision, operator retraining, jig and handling standardization, visual control, and routine defect monitoring. After implementation, the broken connector defect rate decreased from 0.81% to 0.30%, representing a reduction of 62.96%. The findings show that the PDCA method is effective as a structured continuous improvement approach for minimizing connector-related defects in wiring harness production.
Analisis Perubahan Garis Pantai Menggunakan Citra Satelit di Sekitar Muara Sungai Meninting Lombok Nusa Tenggara Barat Najmi Nurgitasari; Eko Pradjoko; Atas Pracoyo
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.704

Abstract

Shoreline change is a dynamic process influenced by oceanographic condition, hydrodynamics, and sediment distribution in coastal areas. This study aims to analyze shoreline changes around the Meninting River Estuary from 2016 to 2025 using Google Earth imagery and the QSCAT plugin in QGIS. The study area was divided into two segments, namely the northern and southern sides of the estuary, to identify the characteristics of shoreline changes in each segment. The research methodology included multi-temporal image acquisition, image georeferencing and rectification processes, rectification error assessment, shoreline digitization based on the wet and dry boundaries of the coast, tidal correction, and analysis of shoreline changes using the transect method. The analysis employed the Linear Regression Rate (LRR) parameter, which estimates shoreline change trends by applying linear regression to shoreline positions over time along each transect. The results of the Linear Regression Rate (LRR) analysis indicate that the northern side of the estuary is dominated by accretion, characterized by a shift in the shoreline toward the sea and a sediment volume of 13,166.39 m3/year. Meanwhile, the southern side of the estuary is dominated by erosion, with a sediment volume of -10,574.75 m3/year.
Monitoring Pendeteksi Kebocoran Gas LPG Pintar Menggunakan Sensor MQ-6 dengan Telegram(Studi Kasus pada UMKM Kabupaten Kendal) Fahrul Rahman; Sumaryanto Sumaryanto; Iman Saufik Suasana
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.705

Abstract

The use of Liquefied Petroleum Gas (LPG) in household and culinary business activities has potential fire and explosion risks when gas leakage is not detected quickly. This study aims to develop a smart LPG leakage detection device based on the Internet of Things (IoT) using the MQ-6 sensor and Telegram notifications at Bakso Imadora Kaliwungu. This research employed the Research and Development (R&D) method through needs analysis, system design, prototype development, integration, testing, and validation. The system consists of an ESP32 Lolin 32 Lite, MQ-6 gas sensor, flame sensor, MG996R servo motor, LED, buzzer, step-down module, and Telegram Bot. The test results showed that the device was able to detect LPG leakage and fire in real time, activate local warnings, close the gas valve automatically, and send Telegram notifications to users. The system achieved 95.3% gas detection accuracy and 97.8% notification delivery success under stable Wi-Fi conditions. Product validation involving 10 respondents produced an average score of 3.46, which was categorized as good and close to very good. Therefore, the developed system is feasible to be used as a safety support device for culinary businesses that use LPG.
Ekoefisiensi Penggunaan Input Produksi pada Usaha Pembibitan Alpukat (Persea americana Mill): Studi Kasus di CV. Mitra Tani, Kabupaten Sleman, Yogyakarta Farhan Mahbubi; Meita Puspa Dewi
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.712

Abstract

Rising demand for quality avocado seedlings intensifies input use in nursery businesses, yet eco-efficiency analysis at the input level remains underexplored in Indonesian horticultural agribusiness literature. This study aims to: (1) identify the types and quantities of production inputs used at CV. Mitra Tani; (2) measure economic feasibility and eco-efficiency of measurable inputs (seedlings, labor, and water); and (3) identify factors influencing eco-efficiency levels. A quantitative descriptive case study design was employed, with primary data collected through structured interviews with the nursery owner on February - April 2026. Eco-efficiency was calculated using a simple ratio approach, while economic feasibility was assessed using the R/C Ratio. Results show that labor cost dominates the cost structure at 96% of total production, reflecting the labor-intensive nature of manual grafting. The R/C Ratio of 2.0 confirms economic feasibility and positions CV Mitra Tani competitively among similar enterprises in Central Java. Seedling eco-efficiency reached IDR 20,000/stem, labor eco-efficiency 3.47 stems/workday, and water eco-efficiency 0.0003 stems/liter. Three structural factors constrain eco-efficiency: limited specialized labor expertise, high urban wage costs, and declining market purchasing power. Eco-efficiency improvements can be achieved without additional inputs through grafting procedure standardization and targeted human resource development. This study contributes an empirical framework for input-level eco-efficiency analysis in horticultural nursery agribusiness.
HEC-HMS Based Hydrological Modeling for Assessing Reservoir Impacts on Flood Hydrographs in the Pacal Watershed Yuliani Wahyu Sardana
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.725

Abstract

The Pacal Watershed in Bojonegoro Regency faces severe periodic flooding driven by intense tropical rainfall and land-use change, making the modeling of how the integration of the Pacal and Gongseng reservoirs attenuates flood hydrographs in small tropical catchments a critical issue. This study introduces a novel framework modeling hydrograph transformations resulting from the interaction between the historical Pacal Reservoir and the modern Gongseng Reservoir using HEC-HMS employing the SCS Curve Number loss method and Nakayasu SUH transformation achieving high predictive reliability with a Nash-Sutcliffe Efficiency score of NSE = 0,81. Simulation results demonstrate that dual-reservoir integration significantly mitigates downstream flood risks across 100-year to 1,000-year return periods, achieving peak discharge reductions of 55,46% to 59,38% (320,9 m3/s to 379,6 m3/s) and delaying peak arrival times by 2 to 6 hours with Pacal Reservoir attenuating 163,1 m3/s – 195,3 m3/s and Gongseng Reservoir reducing 107,2 m3/s – 115,6 m3/s. This study proves that the reservoirs function as reliable hydraulic shock absorbers that extend the emergency evacuation lead-time window for vulnerable downstream communities. Furthermore, it reveals a storage efficiency decay phenomenon during extreme storm events due to finite surcharge storage capacity, underscoring the necessity of pre-release operational rule curves despite modeling limitations that omit sedimentation, baseflow, and channel routing.

Page 12 of 14 | Total Record : 131

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